Android 白板代码实现

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Android白板方案调研
讲述了Android 白板实现的一些细节和问题整理。本篇主要从代码角度展现Android 白板。

白板的调用：

public class CanvasDemoActivity extends Activity { @Override           protected void onCreate(Bundle savedInstanceState) {               super.onCreate(savedInstanceState);                setContentView(R.layout.activity_map);            FragmentTransaction ts = getFragmentManager().beginTransaction();            ts.add(R.id.fl_main, new WhiteBoardFragment(), "wb").commit();

activity_map.xml 布局如下：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <FrameLayout         android:id="@+id/fl_main"        android:layout_width="match_parent"        android:layout_height="match_parent"/>LinearLayout>

从中可以看出直接使用了 WhiteBoardFragment， 下面看 WhiteBoardFragment.java

项目结构如下图所示：

WhiteBoardFragment.java

package com.example.whiteboard.fragment;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_CIRCLE;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_DRAW;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_ERASER;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_LINE;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_RECTANGLE;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_TEXT;import java.io.File;import java.io.FileOutputStream;import android.app.Activity;import android.app.AlertDialog;import android.app.Fragment;import android.content.Context;import android.content.DialogInterface;import android.graphics.Bitmap;import android.graphics.Color;import android.graphics.Point;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.Gravity;import android.view.KeyEvent;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.view.WindowManager;import android.view.inputmethod.EditorInfo;import android.view.inputmethod.InputMethodManager;import android.widget.EditText;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.PopupWindow;import android.widget.RadioGroup;import android.widget.RadioGroup.OnCheckedChangeListener;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.TextView;import android.widget.Toast;import com.example.test.R;import com.example.whiteboard.SketchView;import com.example.whiteboard.SketchView.OnDrawChangedListener;import com.example.whiteboard.SketchView.TextWindowCallback;import com.example.whiteboard.bean.StrokeRecord;import com.example.whiteboard.utils.CommonUtils;import com.example.whiteboard.utils.ScreenUtils;import com.example.whiteboard.utils.SdCardStatus;import com.example.whiteboard.utils.TimeUtils;import com.example.whiteboard.utils.ViewUtils;public class WhiteBoardFragment extends Fragment implements OnClickListener,OnDrawChangedListener{    static final int COLOR_BLACK = Color.parseColor("#ff000000");    static final int COLOR_RED = Color.parseColor("#ffff4444");    static final int COLOR_GREEN = Color.parseColor("#ff99cc00");    static final int COLOR_ORANGE = Color.parseColor("#ffffbb33");    static final int COLOR_BLUE = Color.parseColor("#ff33b5e5");    private static final float BTN_ALPHA = 0.4f;    final String TAG = getClass().getSimpleName();    public static final String FILE_PATH = SdCardStatus.getDefaulstCacheDirInSdCard() + File.separator + "sketchPhoto";    public static final String SCREENSHOT_PATH = SdCardStatus.getDefaulstCacheDirInSdCard() + File.separator +"screenShot";    Activity activity;//上下文    private SketchView mSketchView; // 画布    private ImageView btn_pen; // 画笔    private ImageView btn_eraser;    private ImageView btn_undo;    private ImageView btn_redo;    private ImageView btn_pic;    private ImageView btn_background;    private ImageView btn_drag;    private ImageView btn_save;    private ImageView btn_empty;    private ImageView btn_screenshot;    private int penBaseSize;    private int textOffX,textOffY;    private EditText saveET; // 保存文件的EditText    private EditText textET; // 输入文字的EditText    private AlertDialog saveDialog,dialog, screenshotDialog;    private int mPenType = STROKE_TYPE_DRAW; // 画笔类型    private int mPenColor = COLOR_BLACK; // 画笔颜色    private PopupWindow mPenPopupWindow; // 画笔弹窗    private PopupWindow mEraserPopupWindow;// 橡皮弹窗    private PopupWindow mTextPopupWindow;// 文字输入    private View mPenLayoutView; // 画笔布局    private View mEraserLayoutView;// 橡皮布局    private View mTextLayoutView; // 文字输入框    private ImageView mPenSizeCircle, mPenAlphaCircle;    private SeekBar mPenSizeSeekBar, mPenAlphaSeekBar;    private RadioGroup mPenTypeGroup, mPenColorGroup;    private ImageView mEraserSizeCircle;    private SeekBar mEraserSizeSeekBar;    private static boolean isScreenShoting = false; // 是否正在截屏，保持两次截屏时间间隔大于3秒    private static Handler mHandler = new Handler(){        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            isScreenShoting = false;        }    };    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        activity = getActivity();//初始化上下文    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        View rootView = inflater.inflate(R.layout.fragment_white_board, container,  false);        initView(rootView, inflater);        initDrawParams();//初始化绘画参数        initPopupWindow();//初始化弹窗        initSaveDialog();//初始化保存文件对话框        return rootView;    }    private void initDrawParams() {        //画笔宽度缩放基准参数        Drawable circleDrawable = getResources().getDrawable(R.drawable.circle);        if (circleDrawable != null){            penBaseSize = circleDrawable.getIntrinsicWidth();        }    }    private void initPopupWindow() {        initPenPopupWindow();        initEraserPopupWindow();        initTextPop();    }    private void initSaveDialog(){        saveET = new EditText(activity);        saveET.setHint("新文件名");        saveET.setGravity(Gravity.CENTER);        saveET.setSingleLine();        saveET.setInputType(EditorInfo.TYPE_CLASS_TEXT);        saveET.setImeOptions(EditorInfo.IME_ACTION_DONE);        saveET.setSelectAllOnFocus(true);        saveET.setOnEditorActionListener(new TextView.OnEditorActionListener() {            @Override            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {                if (actionId == EditorInfo.IME_ACTION_DONE) {                    ScreenUtils.hideInput(saveDialog.getCurrentFocus());                    saveDialog.dismiss();                    String input = saveET.getText().toString();                    Log.e("wmb", "--onEditorAction--input:"+input);                    saveInUI(input + ".png");                }                return true;            }        });        saveDialog = new AlertDialog.Builder(activity)                .setTitle("请输入保存文件名")                .setMessage("")                .setView(saveET)                .setPositiveButton("确定", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        ScreenUtils.hideInput(saveDialog.getCurrentFocus());                        String input = saveET.getText().toString();                        Log.e("wmb", "--onClick--input:"+input);                        saveInUI(input + ".png");                    }                }).setNegativeButton("取消", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        ScreenUtils.hideInput(saveDialog.getCurrentFocus());                    }                })                .setCancelable(false)                .create();    }    /**     * 初始化橡皮弹窗     */    private void initEraserPopupWindow() {        mEraserPopupWindow = new PopupWindow(activity);        mEraserPopupWindow.setContentView(mEraserLayoutView);        mEraserPopupWindow.setWidth(550);        mEraserPopupWindow.setHeight(240);        mEraserPopupWindow.setBackgroundDrawable(new BitmapDrawable());        mEraserPopupWindow.setOutsideTouchable(true);        mEraserSizeSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {            @Override            public void onStopTrackingTouch(SeekBar arg0) {            }            @Override            public void onStartTrackingTouch(SeekBar arg0) {            }            @Override            public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) {                setSeekBarProgress(progress, STROKE_TYPE_ERASER);            }        });        mEraserSizeSeekBar.setProgress(SketchView.DEFAULT_ERASER_SIZE);    }    /**     * 初始化画笔弹窗     */    private void initPenPopupWindow() {        mPenPopupWindow = new PopupWindow(activity);        mPenPopupWindow.setContentView(mPenLayoutView);        mPenPopupWindow.setWidth(550);        mPenPopupWindow.setHeight(650);        mPenPopupWindow.setBackgroundDrawable(new BitmapDrawable());        mPenPopupWindow.setOutsideTouchable(true);        // 画笔类型        mPenTypeGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                int resId = R.drawable.stroke_type_rbtn_draw_checked;                switch (checkedId) {                case R.id.type_pen:                    mPenType = STROKE_TYPE_DRAW;                    break;                case R.id.type_line:                    mPenType = STROKE_TYPE_LINE;                    resId = R.drawable.stroke_type_rbtn_line_checked;                    break;                case R.id.type_circle:                    mPenType = STROKE_TYPE_CIRCLE;                    resId = R.drawable.stroke_type_rbtn_circle_checked;                    break;                case R.id.type_rectangle:                    mPenType = STROKE_TYPE_RECTANGLE;                    resId = R.drawable.stroke_type_rbtn_rectangle_checked;                    break;                case R.id.type_text:                    mPenType = STROKE_TYPE_TEXT;                    resId = R.drawable.stroke_type_rbtn_text_checked;                    break;                default:                    break;                }                btn_pen.setImageResource(resId);                mSketchView.setStrokeType(mPenType);                mPenPopupWindow.dismiss();            }        });        // 画笔颜色        mPenColorGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                switch (checkedId) {                case R.id.color_black:                    mPenColor = COLOR_BLACK;                    break;                case R.id.color_red:                    mPenColor = COLOR_RED;                    break;                case R.id.color_green:                    mPenColor = COLOR_GREEN;                    break;                case R.id.color_orange:                    mPenColor = COLOR_ORANGE;                    break;                case R.id.color_blue:                    mPenColor = COLOR_BLUE;                    break;                default:                    break;                }                mSketchView.setStrokeColor(mPenColor);            }        });        // 画笔大小        mPenSizeSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {            @Override            public void onStopTrackingTouch(SeekBar arg0) {            }            @Override            public void onStartTrackingTouch(SeekBar arg0) {            }            @Override            public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) {                setSeekBarProgress(progress, STROKE_TYPE_DRAW);            }        });        mPenSizeSeekBar.setProgress(SketchView.DEFAULT_STROKE_SIZE);        // 画笔透明度        mPenAlphaSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {            @Override            public void onStopTrackingTouch(SeekBar arg0) {            }            @Override            public void onStartTrackingTouch(SeekBar arg0) {            }            @Override            public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) {                int alpha = progress * 255 / 100; // 百分比转换为透明度                mSketchView.setStrokeAlpha(alpha);                mPenAlphaCircle.setAlpha(alpha);            }        });        mPenAlphaSeekBar.setProgress(SketchView.DEFAULT_STROKE_ALPHA);    }    // 初始化文字输入    private void initTextPop() {        mTextPopupWindow = new PopupWindow(activity);        mTextPopupWindow.setContentView(mTextLayoutView);        mTextPopupWindow.setWidth(WindowManager.LayoutParams.WRAP_CONTENT);        mTextPopupWindow.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);        mTextPopupWindow.setFocusable(true);        mTextPopupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);        mTextPopupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);//        mTextPopupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {//            @Override//            public void onDismiss() {//                if (!textET.getText().toString().equals("")) {//                    StrokeRecord record = new StrokeRecord(mPenType);//                    record.text = textET.getText().toString();//                }//            }//        });    }    protected void setSeekBarProgress(int progress, int strokeTypeDraw) {        int realProgress = progress > 1 ? progress : 1;        int newSize = Math.round(penBaseSize * realProgress / 100); // 百分比转换为大小        int offset = Math.round((penBaseSize - newSize) / 2);        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(newSize, newSize);        lp.setMargins(offset, offset, offset, offset);        if(strokeTypeDraw == STROKE_TYPE_DRAW){            mPenSizeCircle.setLayoutParams(lp);        }else{            // 橡皮            mEraserSizeCircle.setLayoutParams(lp);        }        mSketchView.setSize(newSize, strokeTypeDraw);    }    private void initView(View root, LayoutInflater inflater){        mSketchView = ViewUtils.findViewById(root, R.id.id_sketch_view);        btn_pen = ViewUtils.findViewById(root, R.id.id_pen);        btn_eraser = ViewUtils.findViewById(root, R.id.id_eraser);        btn_undo = ViewUtils.findViewById(root, R.id.id_undo);        btn_redo = ViewUtils.findViewById(root, R.id.id_redo);        btn_pic = ViewUtils.findViewById(root, R.id.id_pic);        btn_background = ViewUtils.findViewById(root, R.id.id_bacground);        btn_drag = ViewUtils.findViewById(root, R.id.id_drag);        btn_save = ViewUtils.findViewById(root, R.id.id_save);        btn_empty = ViewUtils.findViewById(root, R.id.id_empty);        btn_screenshot = ViewUtils.findViewById(root, R.id.id_screenshot);        btn_pen.setOnClickListener(this);        btn_eraser.setOnClickListener(this);        btn_undo.setOnClickListener(this);        btn_redo.setOnClickListener(this);        btn_pic.setOnClickListener(this);        btn_background.setOnClickListener(this);        btn_drag.setOnClickListener(this);        btn_save.setOnClickListener(this);        btn_empty.setOnClickListener(this);        btn_screenshot.setOnClickListener(this);        mSketchView.setOnDrawChangedListener(this); // 设置绘画监听        mSketchView.setTextWindowCallback(new TextWindowCallback() {            @Override            public void onText(View view, StrokeRecord record) {                textOffX = record.textOffX;                textOffY = record.textOffY;                showTextPopupWindow(view, record);            }        });        // 初始化画笔弹窗views        mPenLayoutView = inflater.inflate(R.layout.popup_pen, null);        mPenSizeCircle = ViewUtils.findViewById(mPenLayoutView, R.id.pen_size_circle);        mPenAlphaCircle = ViewUtils.findViewById(mPenLayoutView, R.id.pen_alpha_circle);        mPenSizeSeekBar = ViewUtils.findViewById(mPenLayoutView, R.id.pen_size_seek_bar);        mPenAlphaSeekBar = ViewUtils.findViewById(mPenLayoutView, R.id.pen_alpha_seek_bar);        mPenTypeGroup = ViewUtils.findViewById(mPenLayoutView, R.id.pen_type_radio_group);        mPenColorGroup = ViewUtils.findViewById(mPenLayoutView, R.id.pen_color_radio_group);        //初始化橡皮弹窗views        mEraserLayoutView = inflater.inflate(R.layout.popup_eraser, null);        mEraserSizeCircle = ViewUtils.findViewById(mEraserLayoutView, R.id.eraser_size_circle);        mEraserSizeSeekBar = ViewUtils.findViewById(mEraserLayoutView, R.id.eraser_size_seek_bar);        //初始化文字输入        mTextLayoutView = inflater.inflate(R.layout.popup_text, null);        textET = ViewUtils.findViewById(mTextLayoutView, R.id.text_pupwindow_et);        btn_undo.setAlpha(0.4f);        btn_redo.setAlpha(0.4f);        showBtn(btn_pen);    }    @Override    public void onClick(View view) {        switch (view.getId()) {        case R.id.id_pen:            if(mSketchView.getEditMode() == SketchView.EDIT_STROKE && mSketchView.getStrokeType() != STROKE_TYPE_ERASER){                showPopupWindow(view, STROKE_TYPE_DRAW);            }else{                int checkedId = mPenTypeGroup.getCheckedRadioButtonId();                switch (checkedId) {                case R.id.type_pen:                    mPenType = STROKE_TYPE_DRAW;                    break;                case R.id.type_line:                    mPenType = STROKE_TYPE_LINE;                    break;                case R.id.type_circle:                    mPenType = STROKE_TYPE_CIRCLE;                    break;                case R.id.type_rectangle:                    mPenType = STROKE_TYPE_RECTANGLE;                    break;                case R.id.type_text:                    mPenType = STROKE_TYPE_TEXT;                    break;                default:                    break;                }                mSketchView.setStrokeType(mPenType);            }            mSketchView.setEditMode(SketchView.EDIT_STROKE);            showBtn(btn_pen);            break;        case R.id.id_eraser:            if(mSketchView.getEditMode() == SketchView.EDIT_STROKE && mSketchView.getStrokeType() == STROKE_TYPE_ERASER){                showPopupWindow(view, STROKE_TYPE_ERASER);            }else{                mSketchView.setStrokeType(STROKE_TYPE_ERASER);            }            mSketchView.setEditMode(SketchView.EDIT_STROKE);            showBtn(btn_eraser);            break;        case R.id.id_undo:            mSketchView.undo();            break;        case R.id.id_redo:            mSketchView.redo();            break;        case R.id.id_pic:            mSketchView.addPhotoByPath("persion.jpg");            mSketchView.setEditMode(SketchView.EDIT_PHOTO);            showBtn(btn_drag);            break;        case R.id.id_bacground:            mSketchView.setBackgroundByPath("najing.jpeg");            break;        case R.id.id_drag:            mSketchView.setEditMode(SketchView.EDIT_PHOTO);            showBtn(btn_drag);            break;        case R.id.id_save:            if(mSketchView.getRecordCount() == 0){                CommonUtils.showToast("您还没有绘图呢~", 3000);            }else{                showSaveDialog();            }            break;        case R.id.id_empty:            askforErase();            break;        case R.id.id_screenshot:            if(!isScreenShoting){                isScreenShoting = true;                new screenShotTast().execute(TimeUtils.getNowTimeString()+".png");                mHandler.sendEmptyMessageDelayed(0, 3000);            }else{                CommonUtils.showToast("正在截屏，请降低操作速度", 3000);            }            break;        default:            break;        }    }    /**     * 截屏方法     */    private File screenShot(String filepath, String fileName){        if(null == activity)            return null;        Point screenPoint = ScreenUtils.getScreenSize(activity);        if(null == screenPoint)            return null;        int statusBarAndTitleHeight = ScreenUtils.getStatusBarAndTitleHeight(activity);        View view = activity.getWindow().getDecorView();        view.setDrawingCacheEnabled(true);        Bitmap bitmapTemp = view.getDrawingCache();        Bitmap bmp = Bitmap.createBitmap(bitmapTemp, 0, statusBarAndTitleHeight, screenPoint.x, screenPoint.y - statusBarAndTitleHeight);        view.destroyDrawingCache();        try {            File dir = new File(filepath);            if(!dir.exists()){                boolean mk = dir.mkdirs();            }            File f = new File(dir, fileName);            if(!f.exists()){                f.createNewFile();            }else{                f.delete();            }            FileOutputStream out = new FileOutputStream(f);            bmp.compress(Bitmap.CompressFormat.PNG, 90, out);            out.flush();            out.close();            bitmapTemp.recycle();            bmp.recycle();            bitmapTemp = null;            bmp = null;            return f;        } catch (Exception e) {            e.printStackTrace();            return null;        }    }    private void showTextPopupWindow(View anchor, final StrokeRecord record) {        textET.requestFocus();        mTextPopupWindow.showAsDropDown(anchor, record.textOffX, record.textOffY - mSketchView.getHeight());        mTextPopupWindow.setSoftInputMode(PopupWindow.INPUT_METHOD_NEEDED);        InputMethodManager imm = (InputMethodManager) activity                .getSystemService(Context.INPUT_METHOD_SERVICE);        imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);//        ScreenUtils.showInput(textET);        mTextPopupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {            @Override            public void onDismiss() {                if (!textET.getText().toString().equals("")) {                    record.text = textET.getText().toString();                    record.textPaint.setTextSize(textET.getTextSize());                    record.textWidth = textET.getMaxWidth();                    mSketchView.addStrokeRecord(record);                }            }        });    }    private void showSaveDialog() {        saveDialog.show();        saveET.setText(TimeUtils.getNowTimeString());        saveET.selectAll();        ScreenUtils.showInput(mSketchView);    }    private void askforErase() {        new AlertDialog.Builder(activity)                .setMessage("擦除手绘?")                .setPositiveButton("确定", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        mSketchView.erase();                    }                })                .setNegativeButton("取消", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface arg0, int arg1) {                    }                })                .create()                .show();    }    private void showBtn(ImageView iv) {        btn_eraser.setAlpha(BTN_ALPHA);        btn_pen.setAlpha(BTN_ALPHA);        btn_drag.setAlpha(BTN_ALPHA);        iv.setAlpha(1f);    }    private void showPopupWindow(View anchor, int drawMode){        if(drawMode == STROKE_TYPE_DRAW){            mPenPopupWindow.showAsDropDown(anchor, 0, 0);        }else if(drawMode == STROKE_TYPE_ERASER){            mEraserPopupWindow.showAsDropDown(anchor, 0, 0);        }    }    private void saveInUI(final String imgName) {        new saveToFileTask().execute(imgName);    }    public File saveInOI(String filePath, String imgName) {        return saveInOI(filePath, imgName, 80);    }    public File saveInOI(String filePath, String imgName, int compress) {        Log.e("wmb", "--saveInOI--filePath:" + filePath + "--imgName:"                + imgName + "--compress:" + compress);        if (!imgName.contains(".png")) {            imgName += ".png";        }        Log.e(TAG, "saveInOI: " + System.currentTimeMillis());        Bitmap newBM = mSketchView.getResultBitmap();        Log.e(TAG, "saveInOI: " + System.currentTimeMillis());        try {            File dir = new File(filePath);            if (!dir.exists()) {                boolean mk = dir.mkdirs();                Log.e("wmb", "--saveInOI--mk:" + mk);            }            File f = new File(filePath, imgName);            if (!f.exists()) {                boolean cr = f.createNewFile();                Log.e("wmb", "--saveInOI--cr:" + cr);            } else {                f.delete();            }            FileOutputStream out = new FileOutputStream(f);            Log.e(TAG, "saveInOI: " + System.currentTimeMillis());            if (compress >= 1 && compress <= 100)                newBM.compress(Bitmap.CompressFormat.PNG, compress, out);            else {                newBM.compress(Bitmap.CompressFormat.PNG, 80, out);            }            Log.e(TAG, "saveInOI: " + System.currentTimeMillis());            out.close();            newBM.recycle();            newBM = null;            return f;        } catch (Exception e) {            Log.e("wmb", "--e:" + e.getStackTrace());            return null;        }    }    class screenShotTast extends AsyncTask {        @Override        protected File doInBackground(String... screenShotName) {            Log.e("wmb", "screenShotTast--doInBackground");            return screenShot(SCREENSHOT_PATH, screenShotName[0]);        }        @Override        protected void onPostExecute(File result) {            super.onPostExecute(result);            if(null != result && result.exists()){                CommonUtils.showToast("截图成功，正在设置为画板背景...", 1000);//              mSketchView.setBackgroundByPath(result.getAbsolutePath());                mSketchView.addPhotoByPath(result.getAbsolutePath());                mSketchView.setEditMode(SketchView.EDIT_PHOTO);                showBtn(btn_drag);            }else{                CommonUtils.showToast("截图失败，请稍后重试", 3000);            }            screenshotDialog.dismiss();        }        @Override        protected void onPreExecute() {            super.onPreExecute();            Log.e("wmb", "screenShotTast--onPreExecute");            screenshotDialog = new AlertDialog.Builder(activity).setTitle("保存截图")                    .setMessage("截图保存中...").show();        }    }    class saveToFileTask extends AsyncTask {        @Override        protected void onPreExecute() {            super.onPreExecute();            Log.e("wmb", "--onPreExecute");            dialog = new AlertDialog.Builder(activity)                    .setTitle("保存画板")                    .setMessage("保存中...")                    .show();        }        @Override        protected File doInBackground(String... photoName) {             Log.e("wmb", "--doInBackground");            return saveInOI(FILE_PATH, photoName[0]);        }        @Override        protected void onPostExecute(File file) {            super.onPostExecute(file);            if (null != file && file.exists())                Toast.makeText(activity, file.getAbsolutePath(), Toast.LENGTH_SHORT).show();            else                Toast.makeText(activity, "保存失败！", Toast.LENGTH_SHORT).show();            dialog.dismiss();        }    }    @Override    public void onDrawChanged() {        Log.e("wmb", "--onDrawChanged-StrokeRecordCount:"+mSketchView.getStrokeRecordCount()+"--RedoCount:"+mSketchView.getRedoCount());        if(mSketchView.getStrokeRecordCount() > 0){            btn_undo.setAlpha(1f);        }else{            btn_undo.setAlpha(0.4f);        }        if(mSketchView.getRedoCount() > 0){            btn_redo.setAlpha(1f);        }else{            btn_redo.setAlpha(0.4f);        }    }}

StrokeRecord.java

package com.example.whiteboard.bean;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PointF;import android.graphics.RectF;import android.text.TextPaint;/** * stroke record * @author WMB * */public class StrokeRecord {    public static final int STROKE_TYPE_ERASER = 1;    public static final int STROKE_TYPE_DRAW = 2;    public static final int STROKE_TYPE_LINE = 3;    public static final int STROKE_TYPE_CIRCLE = 4;    public static final int STROKE_TYPE_RECTANGLE = 5;    public static final int STROKE_TYPE_TEXT = 6;    public int type;//记录类型    public Paint paint;//笔类    public Path path;//画笔路径数据    public PointF[] linePoints; //线数据    public RectF rect; //圆、矩形区域    public String text;//文字    public TextPaint textPaint;//笔类    public int textOffX;    public int textOffY;    public int textWidth;//文字位置    public StrokeRecord(int type) {        this.type = type;    }}

PhotoRecord.java

package com.example.whiteboard.bean;import android.graphics.Bitmap;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PointF;import android.graphics.RectF;import android.text.TextPaint;/** * photo record * @author WMB * */public class PhotoRecord {    public Bitmap bitmap;//图形    public Matrix matrix;//图形    public RectF photoRectSrc = new RectF();    public float scaleMax = 3;}

SketchData.java

package com.example.whiteboard.bean;import android.graphics.Bitmap;import java.io.File;import java.util.ArrayList;import java.util.List;/** * sketch data */public class SketchData {    public List photoRecordList;    public List strokeRecordList;    public List strokeRedoList;    public Bitmap thumbnailBM;//缩略图文件    public Bitmap backgroundBM;    public SketchData() {        strokeRecordList = new ArrayList<>();        photoRecordList = new ArrayList<>();        strokeRedoList = new ArrayList<>();        backgroundBM = null;        thumbnailBM = null;    }}

DrawView.java

package com.example.whiteboard;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.Rect;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;public class DrawView extends View {    float currentX, currentY;    Paint p = new Paint();    Bitmap bp;    public DrawView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public DrawView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public DrawView(Context context) {        super(context);        bp = Bitmap.createBitmap(2000, 1000, Config.ARGB_4444);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Log.e("wmb", "--onDraw--canvas:"+canvas.toString());        p.setColor(Color.RED);        canvas.drawCircle(currentX, currentY, 30, p);        canvas.saveLayer(0, 0, 2000, 1000, p, Canvas.ALL_SAVE_FLAG);//      p.setColor(Color.GREEN);        bp = Bitmap.createBitmap(2000, 1000, Config.ARGB_4444);//      Canvas tmpcs = new Canvas(bp);//      p.setStyle(Style.STROKE);//      tmpcs.drawRect(new Rect(2, 2, 2000, 900), p);        tmpcs.drawColor(Color.GRAY);//      tmpcs.drawCircle(currentX, currentY, 30, p);//      canvas.drawBitmap(bp, 0, 0, null);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        currentX = event.getX();        currentY = event.getY();        Log.e("wmb", "--onTouchEvent--currentX:"+currentX+"--currentY:"+currentY);        this.invalidate();        return true;    }}

SketchView.java

package com.example.whiteboard;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_CIRCLE;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_DRAW;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_ERASER;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_LINE;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_RECTANGLE;import static com.example.whiteboard.bean.StrokeRecord.STROKE_TYPE_TEXT;import java.io.File;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PaintFlagsDrawFilter;import android.graphics.Path;import android.graphics.PointF;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.os.Environment;import android.support.annotation.NonNull;import android.text.Layout;import android.text.StaticLayout;import android.text.TextPaint;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.ScaleGestureDetector;import android.view.SurfaceHolder;import android.view.View;import android.view.View.OnTouchListener;import android.widget.Toast;import com.example.test.R;import com.example.whiteboard.bean.PhotoRecord;import com.example.whiteboard.bean.SketchData;import com.example.whiteboard.bean.StrokeRecord;import com.example.whiteboard.utils.BitmapUtils;import com.example.whiteboard.utils.ScreenUtils;/** * 画板整体布局 * */public class SketchView extends View implements OnTouchListener/*,Runnable,SurfaceHolder.Callback*/ {    final String TAG = getClass().getSimpleName();    public interface TextWindowCallback {        void onText(View view, StrokeRecord record);    }    public void setTextWindowCallback(TextWindowCallback textWindowCallback) {        this.textWindowCallback = textWindowCallback;    }    private TextWindowCallback textWindowCallback;    private static final float TOUCH_TOLERANCE = 4;    public static final int EDIT_STROKE = 1;    public static final int EDIT_PHOTO = 2;    private static final int ACTION_NONE = 0;    private static final int ACTION_DRAG = 1;    private static final int ACTION_SCALE = 2;    private static final int ACTION_ROTATE = 3;    public static final int DEFAULT_STROKE_SIZE = 7;    public static final int DEFAULT_STROKE_ALPHA = 100;    public static final int DEFAULT_ERASER_SIZE = 50;    private float strokeSize = DEFAULT_STROKE_SIZE;    private int strokeRealColor = Color.BLACK;//画笔实际颜色    private int strokeColor = Color.BLACK;//画笔颜色    private int strokeAlpha = 255;//画笔透明度    private float eraserSize = DEFAULT_ERASER_SIZE;    Paint boardPaint;    Bitmap mirrorMarkBM = BitmapFactory.decodeResource(getResources(), R.drawable.mark_copy);    Bitmap deleteMarkBM = BitmapFactory.decodeResource(getResources(), R.drawable.mark_delete);    Bitmap rotateMarkBM = BitmapFactory.decodeResource(getResources(), R.drawable.mark_rotate);    Bitmap resetMarkBM = BitmapFactory.decodeResource(getResources(), R.drawable.mark_reset);    //    Bitmap rotateMarkBM = BitmapFactory.decodeResource(getResources(), R.drawable.test);    RectF markerCopyRect = new RectF(0, 0, mirrorMarkBM.getWidth(), mirrorMarkBM.getHeight());//镜像标记边界    RectF markerDeleteRect = new RectF(0, 0, deleteMarkBM.getWidth(), deleteMarkBM.getHeight());//删除标记边界    RectF markerRotateRect = new RectF(0, 0, rotateMarkBM.getWidth(), rotateMarkBM.getHeight());//旋转标记边界    RectF markerResetRect = new RectF(0, 0, resetMarkBM.getWidth(), resetMarkBM.getHeight());//旋转标记边界    private Path strokePath;    private Paint strokePaint;//    private Paint erasePaint;    private float downX, downY, preX, preY, curX, curY;    private int mWidth, mHeight;    private Bitmap   mEraseMaskBitmap = null;// 橡皮擦    private Canvas mEraseCanvas;    SketchData curSketchData = new SketchData();    private Context mContext;    Rect backgroundSrcRect = new Rect();    Rect backgroundDstRect = new Rect();    StrokeRecord curStrokeRecord;    PhotoRecord curPhotoRecord;    int actionMode;    private int editMode = EDIT_STROKE;    private static float SCALE_MAX = 4.0f;    private static float SCALE_MIN = 0.2f;    private static float SCALE_MIN_LEN;    private boolean isFirstIn = true;    private int mScreenWidth = 720,mScreenHeight = 1134;    float simpleScale = 0.5f;//图片载入的缩放倍数    /**     * 缩放手势     */    private ScaleGestureDetector mScaleGestureDetector = null;    public void setStrokeType(int strokeType) {        this.strokeType = strokeType;    }    public int getStrokeType() {        return strokeType;    }    private int strokeType = StrokeRecord.STROKE_TYPE_DRAW;    private OnDrawChangedListener onDrawChangedListener;    public void setSketchData(SketchData sketchData) {        this.curSketchData = sketchData;        curPhotoRecord = null;    }    public void updateSketchData(SketchData sketchData) {        if (curSketchData != null)            curSketchData.thumbnailBM = getThumbnailResultBitmap();//更新数据前先保存上一份数据的缩略图        setSketchData(sketchData);    }    public SketchView(Context context, AttributeSet attr) {        super(context, attr);        this.mContext = context;        setFocusable(true);        initParams(context);        if (isFocusable()) {            this.setOnTouchListener(this);            mScaleGestureDetector = new ScaleGestureDetector(context, new ScaleGestureDetector.OnScaleGestureListener() {                @Override                public boolean onScale(ScaleGestureDetector detector) {                    onScaleAction(detector);                    return true;                }                @Override                public boolean onScaleBegin(ScaleGestureDetector detector) {                    return true;                }                @Override                public void onScaleEnd(ScaleGestureDetector detector) {                }            });        }        invalidate();    }    //初始化    private void initBmpMask(Canvas canvas) {        mScreenWidth = getWidth();        mScreenHeight = getHeight();        Log.e("iwmb", "--mScreenWidth:"+mScreenWidth+"--mScreenHeight:"+mScreenHeight);    }    private void initParams(Context context) {        strokePaint = new Paint();        strokePaint.setAntiAlias(true);        strokePaint.setDither(true);        strokePaint.setColor(strokeRealColor);        strokePaint.setStyle(Paint.Style.STROKE);        strokePaint.setStrokeJoin(Paint.Join.ROUND);        strokePaint.setStrokeCap(Paint.Cap.ROUND);        strokePaint.setStrokeWidth(strokeSize);//        erasePaint = new Paint();//        erasePaint.setAntiAlias(true);//        erasePaint.setDither(true);//        erasePaint.setColor(0xFF000000);//        erasePaint.setStyle(Paint.Style.STROKE);//        erasePaint.setStrokeJoin(Paint.Join.ROUND);//        erasePaint.setStrokeCap(Paint.Cap.ROUND);//        erasePaint.setStrokeWidth(200);//        erasePaint.setXfermode(new PorterDuffXfermode(Mode.DST_OUT));        boardPaint = new Paint();        boardPaint.setColor(Color.GREEN);        boardPaint.setStrokeWidth(ScreenUtils.dip2px(mContext, 0.8f));        boardPaint.setStyle(Paint.Style.STROKE);        SCALE_MIN_LEN = ScreenUtils.dip2px(context, 20);    }    public void setStrokeAlpha(int mAlpha) {        this.strokeAlpha = mAlpha;        calculColor();        strokePaint.setStrokeWidth(strokeSize);    }    public void setStrokeColor(int color) {        strokeColor = color;        calculColor();        strokePaint.setColor(strokeRealColor);    }    private void calculColor() {        strokeRealColor = Color.argb(strokeAlpha, Color.red(strokeColor), Color.green(strokeColor), Color.blue(strokeColor));    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        mWidth = MeasureSpec.getSize(widthMeasureSpec);        mHeight = MeasureSpec.getSize(heightMeasureSpec);        setMeasuredDimension(mWidth, mHeight);    }    @Override    public boolean onTouch(View arg0, MotionEvent event) {        curX = event.getX();        curY = event.getY();        switch (event.getAction() & MotionEvent.ACTION_MASK) {            case MotionEvent.ACTION_POINTER_DOWN:                float downDistance = spacing(event);                Log.e("wmb", "--onTouch--"+event.getAction()+"--space:"+downDistance);                if (actionMode == ACTION_DRAG && downDistance > 10)//防止误触                    actionMode = ACTION_SCALE;                break;            case MotionEvent.ACTION_DOWN:                Log.e("wmb", "--onTouch--action down");                touch_down(event);                invalidate();                break;            case MotionEvent.ACTION_MOVE:                Log.e("wmb", "--onTouch--action move");                touch_move(event);                invalidate();                break;            case MotionEvent.ACTION_UP:                Log.e("wmb", "--onTouch--action up");                touch_up();                invalidate();                break;        }        preX = curX;        preY = curY;        return true;    }    private float spacing(MotionEvent event) {        float x = event.getX(0) - event.getX(1);        float y = event.getY(0) - event.getY(1);        return (float) Math.sqrt(x * x + y * y);    }    @Override    protected void onDraw(Canvas canvas) {        if(isFirstIn){            initBmpMask(canvas);            Log.e("iwmb", "--drawRecord isFristIN");            isFirstIn = false;        }        drawBackground(canvas);        drawRecord(canvas);//        if (onDrawChangedListener != null)//            onDrawChangedListener.onDrawChanged();    }    private void drawBackground(Canvas canvas) {        if (curSketchData.backgroundBM != null) {            //缩放图片，使之能够在屏幕中完整显示（大图压缩、小图放大）            Matrix matrix = new Matrix();            float wScale = (float) canvas.getWidth() / curSketchData.backgroundBM.getWidth();            float hScale = (float) canvas.getHeight() / curSketchData.backgroundBM.getHeight();            matrix.postScale(wScale, hScale);            canvas.drawBitmap(curSketchData.backgroundBM, matrix, null);            Log.e("iwmb", "--canvas.getWidth():"+canvas.getWidth()+"--canvas.getHeight():"+canvas.getHeight());            Log.d(TAG, "drawBackground:src= " + backgroundSrcRect.toString() + ";dst=" + backgroundDstRect.toString());        } else {            canvas.drawColor(Color.WHITE);        }    }    private void drawRecord(Canvas canvas) {        drawRecord(canvas, true);    }    private void drawRecord(Canvas canvas, boolean isDrawBoard) {        mEraseMaskBitmap = Bitmap.createBitmap(mScreenWidth, mScreenHeight, Bitmap.Config.ARGB_8888);        mEraseCanvas = new Canvas(mEraseMaskBitmap);        mEraseCanvas.drawColor(Color.TRANSPARENT);        if (curSketchData != null) {            for (PhotoRecord record : curSketchData.photoRecordList) {                if (record != null)                    canvas.drawBitmap(record.bitmap, record.matrix, null);            }            if (isDrawBoard && editMode == EDIT_PHOTO && curPhotoRecord != null) {                SCALE_MAX = curPhotoRecord.scaleMax;                float[] photoCorners = calculateCorners(curPhotoRecord);//计算图片四个角点和中心点                drawBoard(canvas, photoCorners);//绘制图形边线                drawMarks(canvas, photoCorners);//绘制边角图片            }            for (StrokeRecord record : curSketchData.strokeRecordList) {                int type = record.type;                if (type == StrokeRecord.STROKE_TYPE_ERASER){ // 橡皮擦                    mEraseCanvas.drawPath(record.path, record.paint);                } else if (type == StrokeRecord.STROKE_TYPE_DRAW || type == StrokeRecord.STROKE_TYPE_LINE) {                    Log.e("iwmb", "--drawRecord:--path:"+record.path.toString()+"--type:"+type);//                    canvas.drawPath(record.path, record.paint);                    mEraseCanvas.drawPath(record.path, record.paint);                } else if (type == STROKE_TYPE_CIRCLE) {                    Log.e("iwmb", "--drawcircle:--path:"+record.rect.toString()+"--type:"+type);//                    canvas.drawOval(record.rect, record.paint);                    mEraseCanvas.drawOval(record.rect, record.paint);                } else if (type == STROKE_TYPE_RECTANGLE) {//                    canvas.drawRect(record.rect, record.paint);                    mEraseCanvas.drawRect(record.rect, record.paint);                } else if (type == STROKE_TYPE_TEXT) {                    if (record.text != null) {                        StaticLayout layout = new StaticLayout(record.text, record.textPaint, record.textWidth, Layout.Alignment.ALIGN_NORMAL, 1.0F, 0.0F, true);//                        canvas.translate(record.textOffX, record.textOffY);//                        layout.draw(canvas);//                        canvas.translate(-record.textOffX, -record.textOffY);                        mEraseCanvas.translate(record.textOffX, record.textOffY);                        layout.draw(mEraseCanvas);                        mEraseCanvas.translate(-record.textOffX, -record.textOffY);                    }                }            }            canvas.drawBitmap(mEraseMaskBitmap, 0, 0, null);        }    }    //绘制图像边线（由于图形旋转或不一定是矩形，所以用Path绘制边线）    private void drawBoard(Canvas canvas, float[] photoCorners) {        Path photoBorderPath = new Path();        photoBorderPath.moveTo(photoCorners[0], photoCorners[1]);        photoBorderPath.lineTo(photoCorners[2], photoCorners[3]);        photoBorderPath.lineTo(photoCorners[4], photoCorners[5]);        photoBorderPath.lineTo(photoCorners[6], photoCorners[7]);        photoBorderPath.lineTo(photoCorners[0], photoCorners[1]);        canvas.drawPath(photoBorderPath, boardPaint);    }    //绘制边角操作图标    private void drawMarks(Canvas canvas, float[] photoCorners) {        float x;        float y;        x = photoCorners[0] - markerCopyRect.width() / 2;        y = photoCorners[1] - markerCopyRect.height() / 2;        markerCopyRect.offsetTo(x, y);        canvas.drawBitmap(mirrorMarkBM, x, y, null);        x = photoCorners[2] - markerDeleteRect.width() / 2;        y = photoCorners[3] - markerDeleteRect.height() / 2;        markerDeleteRect.offsetTo(x, y);        canvas.drawBitmap(deleteMarkBM, x, y, null);        x = photoCorners[4] - markerRotateRect.width() / 2;        y = photoCorners[5] - markerRotateRect.height() / 2;        markerRotateRect.offsetTo(x, y);        canvas.drawBitmap(rotateMarkBM, x, y, null);        x = photoCorners[6] - markerResetRect.width() / 2;        y = photoCorners[7] - markerResetRect.height() / 2;        markerResetRect.offsetTo(x, y);        canvas.drawBitmap(resetMarkBM, x, y, null);    }    private float[] calculateCorners(PhotoRecord record) {        float[] photoCornersSrc = new float[10];//0,1代表左上角点XY，2,3代表右上角点XY，4,5代表右下角点XY，6,7代表左下角点XY，8,9代表中心点XY        float[] photoCorners = new float[10];//0,1代表左上角点XY，2,3代表右上角点XY，4,5代表右下角点XY，6,7代表左下角点XY，8,9代表中心点XY        RectF rectF = record.photoRectSrc;        photoCornersSrc[0] = rectF.left;        photoCornersSrc[1] = rectF.top;        photoCornersSrc[2] = rectF.right;        photoCornersSrc[3] = rectF.top;        photoCornersSrc[4] = rectF.right;        photoCornersSrc[5] = rectF.bottom;        photoCornersSrc[6] = rectF.left;        photoCornersSrc[7] = rectF.bottom;        photoCornersSrc[8] = rectF.centerX();        photoCornersSrc[9] = rectF.centerY();        curPhotoRecord.matrix.mapPoints(photoCorners, photoCornersSrc);        return photoCorners;    }    private float getMaxScale(RectF photoSrc) {        return Math.max(getWidth(), getHeight()) / Math.max(photoSrc.width(), photoSrc.height());//        SCALE_MIN = SCALE_MAX / 5;    }    public void addStrokeRecord(StrokeRecord record) {        curSketchData.strokeRecordList.add(record);        invalidate();    }    private void touch_down(MotionEvent event) {        downX = event.getX();        downY = event.getY();        if (editMode == EDIT_STROKE) {            curSketchData.strokeRedoList.clear();            curStrokeRecord = new StrokeRecord(strokeType);            if (strokeType == STROKE_TYPE_ERASER) {                strokePath = new Path();                strokePath.moveTo(downX, downY);                curStrokeRecord.paint = new Paint(strokePaint); // Clones the mPaint object                curStrokeRecord.paint.setXfermode(new PorterDuffXfermode(Mode.DST_OUT));                curStrokeRecord.paint.setStrokeWidth(eraserSize);                curStrokeRecord.path = strokePath;            } else if (strokeType == STROKE_TYPE_DRAW || strokeType == STROKE_TYPE_LINE) {                strokePath = new Path();                strokePath.moveTo(downX, downY);                curStrokeRecord.path = strokePath;                strokePaint.setColor(strokeRealColor);                strokePaint.setStrokeWidth(strokeSize);                curStrokeRecord.paint = new Paint(strokePaint); // Clones the mPaint object            } else if (strokeType == STROKE_TYPE_CIRCLE || strokeType == STROKE_TYPE_RECTANGLE) {                RectF rect = new RectF(downX, downY, downX, downY);                curStrokeRecord.rect = rect;                strokePaint.setColor(strokeRealColor);                strokePaint.setStrokeWidth(strokeSize);                curStrokeRecord.paint = new Paint(strokePaint); // Clones the mPaint object            } else if (strokeType == STROKE_TYPE_TEXT) {                curStrokeRecord.textOffX = (int) downX;                curStrokeRecord.textOffY = (int) downY;                TextPaint tp = new TextPaint();                tp.setColor(strokeRealColor);                curStrokeRecord.textPaint = tp; // Clones the mPaint object                textWindowCallback.onText(this, curStrokeRecord);                return;            }            curSketchData.strokeRecordList.add(curStrokeRecord);        } else if (editMode == EDIT_PHOTO) {            float[] downPoint = new float[]{downX, downY};            if (isInMarkRect(downPoint)) {// 先判操作标记区域                return;            }            if (isInPhotoRect(curPhotoRecord, downPoint)) {//再判断是否点击了当前图片                actionMode = ACTION_DRAG;                return;            }            selectPhoto(downPoint);//最后判断是否点击了其他图片        }    }    //judge click which photo，then can edit the photo    private void selectPhoto(float[] downPoint) {        PhotoRecord clickRecord = null;        for (int i = curSketchData.photoRecordList.size() - 1; i >= 0; i--) {            PhotoRecord record = curSketchData.photoRecordList.get(i);            if (isInPhotoRect(record, downPoint)) {                clickRecord = record;                break;            }        }        if (clickRecord != null) {            setCurPhotoRecord(clickRecord);            actionMode = ACTION_DRAG;        } else {            actionMode = ACTION_NONE;        }    }    private boolean isInMarkRect(float[] downPoint) {        if (markerRotateRect.contains(downPoint[0], (int) downPoint[1])) {//判断是否在区域内            actionMode = ACTION_ROTATE;            return true;        }        if (markerDeleteRect.contains(downPoint[0], (int) downPoint[1])) {//判断是否在区域内            curSketchData.photoRecordList.remove(curPhotoRecord);            setCurPhotoRecord(null);            actionMode = ACTION_NONE;            return true;        }        if (markerCopyRect.contains(downPoint[0], (int) downPoint[1])) {//判断是否在区域内            PhotoRecord newRecord = initPhotoRecord(curPhotoRecord.bitmap);            newRecord.matrix = new Matrix(curPhotoRecord.matrix);            newRecord.matrix.postTranslate(ScreenUtils.dip2px(mContext, 20), ScreenUtils.dip2px(mContext, 20));//偏移小段距离以分辨新复制的图片            setCurPhotoRecord(newRecord);            actionMode = ACTION_NONE;            return true;        }        if (markerResetRect.contains(downPoint[0], (int) downPoint[1])) {//判断是否在区域内            curPhotoRecord.matrix.reset();            curPhotoRecord.matrix.setTranslate(getWidth() / 2 - curPhotoRecord.photoRectSrc.width() / 2,                    getHeight() / 2 - curPhotoRecord.photoRectSrc.height() / 2);            actionMode = ACTION_NONE;            return true;        }        return false;    }    private boolean isInPhotoRect(PhotoRecord record, float[] downPoint) {        if (record != null) {            float[] invertPoint = new float[2];            Matrix invertMatrix = new Matrix();            record.matrix.invert(invertMatrix);            invertMatrix.mapPoints(invertPoint, downPoint);            return record.photoRectSrc.contains(invertPoint[0], invertPoint[1]);        }        return false;    }    private void touch_move(MotionEvent event) {        if (editMode == EDIT_STROKE) {            if (strokeType == STROKE_TYPE_ERASER) {                strokePath.quadTo(preX, preY, (curX + preX) / 2, (curY + preY) / 2);//              curStrokeRecord.path.quadTo(preX, preY, (curX + preX) / 2, (curY + preY) / 2);            } else if (strokeType == STROKE_TYPE_DRAW) {                strokePath.quadTo(preX, preY, (curX + preX) / 2, (curY + preY) / 2);//              curStrokeRecord.path.quadTo(preX, preY, (curX + preX) / 2, (curY + preY) / 2);            } else if (strokeType == STROKE_TYPE_LINE) {                strokePath.reset();                strokePath.moveTo(downX, downY);                strokePath.lineTo(curX, curY);//              curStrokeRecord.path.reset();//              curStrokeRecord.path.moveTo(downX, downY);//              curStrokeRecord.path.lineTo(curX, curY);            } else if (strokeType == STROKE_TYPE_CIRCLE || strokeType == STROKE_TYPE_RECTANGLE) {                curStrokeRecord.rect.set(downX < curX ? downX : curX, downY < curY ? downY : curY, downX > curX ? downX : curX, downY > curY ? downY : curY);            } else if (strokeType == STROKE_TYPE_TEXT) {            }        } else if (editMode == EDIT_PHOTO && curPhotoRecord != null) {            if (actionMode == ACTION_DRAG) {                onDragAction(curX - preX, curY - preY);            } else if (actionMode == ACTION_ROTATE) {                onRotateAction(curPhotoRecord);            } else if (actionMode == ACTION_SCALE) {                mScaleGestureDetector.onTouchEvent(event);            }        }        preX = curX;        preY = curY;    }    private void onScaleAction(ScaleGestureDetector detector) {        float[] photoCorners = calculateCorners(curPhotoRecord);        //目前图片对角线长度        float len = (float) Math.sqrt(Math.pow(photoCorners[0] - photoCorners[4], 2) + Math.pow(photoCorners[1] - photoCorners[5], 2));        double photoLen = Math.sqrt(Math.pow(curPhotoRecord.photoRectSrc.width(), 2) + Math.pow(curPhotoRecord.photoRectSrc.height(), 2));        float scaleFactor = detector.getScaleFactor();        //设置Matrix缩放参数        if ((scaleFactor < 1 && len >= photoLen * SCALE_MIN && len >= SCALE_MIN_LEN) || (scaleFactor > 1 && len <= photoLen * SCALE_MAX)) {            Log.e(scaleFactor + "", scaleFactor + "");            curPhotoRecord.matrix.postScale(scaleFactor, scaleFactor, photoCorners[8], photoCorners[9]);        }    }    private void onRotateAction(PhotoRecord record) {        float[] corners = calculateCorners(record);        //放大        //目前触摸点与图片显示中心距离        float a = (float) Math.sqrt(Math.pow(curX - corners[8], 2) + Math.pow(curY - corners[9], 2));        //目前上次旋转图标与图片显示中心距离        float b = (float) Math.sqrt(Math.pow(corners[4] - corners[0], 2) + Math.pow(corners[5] - corners[1], 2)) / 2;        //设置Matrix缩放参数        double photoLen = Math.sqrt(Math.pow(record.photoRectSrc.width(), 2) + Math.pow(record.photoRectSrc.height(), 2));        if (a >= photoLen / 2 * SCALE_MIN && a >= SCALE_MIN_LEN && a <= photoLen / 2 * SCALE_MAX) {            //这种计算方法可以保持旋转图标坐标与触摸点同步缩放            float scale = a / b;            record.matrix.postScale(scale, scale, corners[8], corners[9]);        }        //旋转        //根据移动坐标的变化构建两个向量，以便计算两个向量角度.        PointF preVector = new PointF();        PointF curVector = new PointF();        preVector.set(preX - corners[8], preY - corners[9]);//旋转后向量        curVector.set(curX - corners[8], curY - corners[9]);//旋转前向量        //计算向量长度        double preVectorLen = getVectorLength(preVector);        double curVectorLen = getVectorLength(curVector);        //计算两个向量的夹角.        double cosAlpha = (preVector.x * curVector.x + preVector.y * curVector.y)                / (preVectorLen * curVectorLen);        //由于计算误差，可能会带来略大于1的cos，例如        if (cosAlpha > 1.0f) {            cosAlpha = 1.0f;        }        //本次的角度已经计算出来。        double dAngle = Math.acos(cosAlpha) * 180.0 / Math.PI;        // 判断顺时针和逆时针.        //判断方法其实很简单，这里的v1v2其实相差角度很小的。        //先转换成单位向量        preVector.x /= preVectorLen;        preVector.y /= preVectorLen;        curVector.x /= curVectorLen;        curVector.y /= curVectorLen;        //作curVector的逆时针垂直向量。        PointF verticalVec = new PointF(curVector.y, -curVector.x);        //判断这个垂直向量和v1的点积，点积>0表示俩向量夹角锐角。=0表示垂直，<0表示钝角        float vDot = preVector.x * verticalVec.x + preVector.y * verticalVec.y;        if (vDot > 0) {            //v2的逆时针垂直向量和v1是锐角关系，说明v1在v2的逆时针方向。        } else {            dAngle = -dAngle;        }        record.matrix.postRotate((float) dAngle, corners[8], corners[9]);    }    /**     * 获取p1到p2的线段的长度     *     * @return     */    double getVectorLength(PointF vector) {        return Math.sqrt(vector.x * vector.x + vector.y * vector.y);    }    private void onDragAction(float distanceX, float distanceY) {            curPhotoRecord.matrix.postTranslate((int) distanceX, (int) distanceY);    }    private void touch_up() {        if (onDrawChangedListener != null)          onDrawChangedListener.onDrawChanged();    }    @NonNull    public Bitmap getResultBitmap() {        Bitmap newBM = Bitmap.createBitmap(mWidth, mHeight, Bitmap.Config.RGB_565);        Canvas canvas = new Canvas(newBM);        canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));//抗锯齿        //绘制背景        drawBackground(canvas);        drawRecord(canvas, false);        canvas.save(Canvas.ALL_SAVE_FLAG);        canvas.restore();        return newBM;    }    @NonNull    public void createCurThumbnailBM() {        curSketchData.thumbnailBM = getThumbnailResultBitmap();    }    @NonNull    public Bitmap getThumbnailResultBitmap() {        return BitmapUtils.createBitmapThumbnail(getResultBitmap(), true, ScreenUtils.dip2px(mContext, 200), ScreenUtils.dip2px(mContext, 200));    }    /*     * 删除一笔     */    public void undo() {        if (curSketchData.strokeRecordList.size() > 0) {            curSketchData.strokeRedoList.add(curSketchData.strokeRecordList.get(curSketchData.strokeRecordList.size() - 1));            curSketchData.strokeRecordList.remove(curSketchData.strokeRecordList.size() - 1);            invalidate();            touch_up(); // refresh redo/undo icon status        }    }    /*     * 撤销     */    public void redo() {        if (curSketchData.strokeRedoList.size() > 0) {            curSketchData.strokeRecordList.add(curSketchData.strokeRedoList.get(curSketchData.strokeRedoList.size() - 1));            curSketchData.strokeRedoList.remove(curSketchData.strokeRedoList.size() - 1);            invalidate();            touch_up(); // refresh redo/undo icon status        }    }    public int getRedoCount() {        return curSketchData.strokeRedoList != null ? curSketchData.strokeRedoList.size() : 0;    }    public int getRecordCount() {        return (curSketchData.strokeRecordList != null && curSketchData.photoRecordList != null) ? curSketchData.strokeRecordList.size() + curSketchData.photoRecordList.size() : 0;    }    public int getStrokeRecordCount() {        return curSketchData.strokeRecordList != null ? curSketchData.strokeRecordList.size() : 0;    }    public int getStrokeSize() {        return Math.round(this.strokeSize);    }    public void setSize(int size, int eraserOrStroke) {        switch (eraserOrStroke) {            case STROKE_TYPE_DRAW:                strokeSize = size;                break;            case STROKE_TYPE_ERASER:                eraserSize = size;                break;        }    }    public void erase() {        // 先判断是否已经回收        for (PhotoRecord record : curSketchData.photoRecordList) {            if (record != null && record.bitmap != null && !record.bitmap.isRecycled()) {                record.bitmap.recycle();                record.bitmap = null;            }        }        if (curSketchData.backgroundBM != null && !curSketchData.backgroundBM.isRecycled()) {            // 回收并且置为null            curSketchData.backgroundBM.recycle();            curSketchData.backgroundBM = null;        }        curSketchData.strokeRecordList.clear();        curSketchData.photoRecordList.clear();        curSketchData.strokeRedoList.clear();        curPhotoRecord = null;        System.gc();        invalidate();    }    public void setOnDrawChangedListener(OnDrawChangedListener listener) {        this.onDrawChangedListener = listener;    }    public interface OnDrawChangedListener {        public void onDrawChanged();    }    public void addPhotoByPath(String path) {        Bitmap sampleBM = getSampleBitMap(path);        if (sampleBM != null) {            PhotoRecord newRecord = initPhotoRecord(sampleBM);            setCurPhotoRecord(newRecord);        } else {            Toast.makeText(mContext, "图片文件路径有误！", Toast.LENGTH_SHORT).show();        }    }    public void setBackgroundByPath(String path) {        Bitmap sampleBM = getSampleBitMap(path);        if (sampleBM != null) {            curSketchData.backgroundBM = sampleBM;            backgroundSrcRect = new Rect(0, 0, curSketchData.backgroundBM.getWidth(), curSketchData.backgroundBM.getHeight());            backgroundDstRect = new Rect(0, 0, mWidth, mHeight);            invalidate();        } else {            Toast.makeText(mContext, "图片文件路径有误！", Toast.LENGTH_SHORT).show();        }    }    public Bitmap getSampleBitMap(String path) {        Bitmap sampleBM = null;        if (path.contains(Environment.getExternalStorageDirectory().toString())) {            sampleBM = getSDCardPhoto(path);        } else {            sampleBM = getAssetsPhoto(path);        }        return sampleBM;    }    @NonNull    private PhotoRecord initPhotoRecord(Bitmap bitmap) {        PhotoRecord newRecord = new PhotoRecord();        newRecord.bitmap = bitmap;        newRecord.photoRectSrc = new RectF(0, 0, newRecord.bitmap.getWidth(), newRecord.bitmap.getHeight());        newRecord.scaleMax = getMaxScale(newRecord.photoRectSrc);//放大倍数        newRecord.matrix = new Matrix();        newRecord.matrix.postTranslate(getWidth() / 2 - bitmap.getWidth() / 2, getHeight() / 2 - bitmap.getHeight() / 2);        return newRecord;    }    private void setCurPhotoRecord(PhotoRecord record) {        curSketchData.photoRecordList.remove(record);        curSketchData.photoRecordList.add(record);        curPhotoRecord = record;        invalidate();    }    public Bitmap getSDCardPhoto(String path) {        File file = new File(path);        if (file.exists()) {            return BitmapUtils.decodeSampleBitMapFromFile(mContext, path, simpleScale);        } else {            return null;        }    }    public Bitmap getAssetsPhoto(String path) {        return BitmapUtils.getBitmapFromAssets(mContext, path);    }    public void setEditMode(int editMode) {        this.editMode = editMode;        invalidate();    }    public int getEditMode() {        return editMode;    }}

WhiteBoardView.java

package com.example.whiteboard;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.graphics.Path;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;/** * white board view * you can draw on it  * @author WMB * */public class WhiteBoardView extends View{    private Paint mPaint =  new Paint();    private List mPathList = new ArrayList();    private Path mPath = new Path();    private float mX,mY;    private Bitmap tempBM;    public WhiteBoardView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public WhiteBoardView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public WhiteBoardView(Context context) {        super(context);        mPaint.setAntiAlias(true);        mPaint.setStyle(Style.STROKE);        mPaint.setStrokeWidth(10);        mPaint.setColor(Color.BLACK);        tempBM = Bitmap.createBitmap(2000, 1500, Config.ARGB_4444);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction() & MotionEvent.ACTION_MASK) {        case MotionEvent.ACTION_POINTER_DOWN:            Log.e("wmb", "--ACTION_POINTER_DOWN");            break;        case MotionEvent.ACTION_POINTER_UP:            Log.e("wmb", "--ACTION_POINTER_UP");            break;        case MotionEvent.ACTION_DOWN:            Log.e("wmb", "--action donw");            touch_down(event);            invalidate();            break;        case MotionEvent.ACTION_MOVE:            Log.e("wmb", "--action move");            touch_move(event);            invalidate();            break;        case MotionEvent.ACTION_UP:            Log.e("wmb", "--action up");            touch_up(event);            invalidate();            break;        default:            break;        }        return true;    }    private void touch_up(MotionEvent event) {    }    private void touch_move(MotionEvent event) {        float x = event.getX();        float y = event.getY();        float preX = mX;        float preY = mY;        float dx = Math.abs(preX - x);        float dy = Math.abs(preY - y); //      if(dx >= 3 || dy >= 3){            float cX = (x + preX) / 2;            float cY = (y + preY) / 2;            mPath.reset();            mPath.moveTo(preX, preY);            mPath.lineTo(x, y);/*(x, y, cX, cY);*///          mX = x;//          mY = y;//      }    }    private void touch_down(MotionEvent event) {//      mPath.reset();        float x = event.getX();        float y = event.getY();        mX = x;        mY = y;        mPath.moveTo(x, y);    }    @Override    protected void onDraw(Canvas canvas) {//      for (int i = 0; i < mPathList.size(); i++) {//          Log.e("wmb", "--ondraw--i:"+i);        canvas.drawColor(Color.GREEN);        tempBM = Bitmap.createBitmap(2000, 1500, Config.ARGB_4444);        Canvas tmpCs = new Canvas(tempBM);        tmpCs.drawPath(mPath, mPaint);        canvas.drawBitmap(tempBM, 0, 0, null);//          canvas.drawPath(mPath, mPaint);//          canvas.save();        }//      super.onDraw(canvas);    }

BitmapUtils.java

package com.example.whiteboard.utils;import android.content.Context;import android.content.res.Configuration;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Matrix;import android.util.Log;import android.view.WindowManager;import java.io.InputStream;/** * Created by TangentLu on 2015/8/19. */public class BitmapUtils {    /**     * 是否为横屏     * @param context     * @return     */    public static boolean isLandScreen(Context context) {        int ori =context.getResources().getConfiguration().orientation;//获取屏幕方向        return ori == Configuration.ORIENTATION_LANDSCAPE;    }    public static Bitmap decodeSampleBitMapFromFile(Context context, String filePath, float sampleScale) {        //先得到bitmap的高宽        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        BitmapFactory.decodeFile(filePath, options);        //再用屏幕一半高宽、缩小后的高宽对比，取小值进行缩放        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);        int reqWidth = wm.getDefaultDisplay().getWidth();        int reqHeight = wm.getDefaultDisplay().getWidth();        int scaleWidth = (int) (options.outWidth * sampleScale);        int scaleHeight = (int) (options.outHeight * sampleScale);        reqWidth = Math.min(reqWidth, scaleWidth);        reqHeight = Math.min(reqHeight, scaleHeight);        options = sampleBitmapOptions(context, options, reqWidth, reqHeight);        Bitmap bm = BitmapFactory.decodeFile(filePath, options);        Log.e("xxx", bm.getByteCount() + "");        return bm;    }    public static Bitmap decodeSampleBitMapFromResource(Context context, int resId, int reqWidth, int reqHeight) {        BitmapFactory.Options options = new BitmapFactory.Options();        options.inJustDecodeBounds = true;        BitmapFactory.decodeResource(context.getResources(), resId, options);        options = sampleBitmapOptions(context, options, reqWidth, reqHeight);        Bitmap bm = BitmapFactory.decodeResource(context.getResources(), resId, options);        Log.e("xxx", bm.getByteCount() + "");        return bm;    }    public static Bitmap createBitmapThumbnail(Bitmap bitMap, boolean needRecycle, int newHeight, int newWidth) {        int width = bitMap.getWidth();        int height = bitMap.getHeight();        // 计算缩放比例        float scale = Math.min((float) newWidth / width, (float) (newHeight) / height);        // 取得想要缩放的matrix参数        Matrix matrix = new Matrix();        matrix.postScale(scale, scale);        // 得到新的图片        Bitmap newBitMap = Bitmap.createBitmap(bitMap, 0, 0, width, height, matrix, true);        if (needRecycle)            bitMap.recycle();        return newBitMap;    }    public static BitmapFactory.Options sampleBitmapOptions(            Context context, BitmapFactory.Options options, int reqWidth, int reqHeight) {        int targetDensity = context.getResources().getDisplayMetrics().densityDpi;        // Calculate inSampleSize        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);        double xSScale = ((double) options.outWidth) / ((double) reqWidth);        double ySScale = ((double) options.outHeight) / ((double) reqHeight);        double startScale = xSScale > ySScale ? xSScale : ySScale;        options.inScaled = true;        options.inDensity = (int) (targetDensity * startScale);        options.inTargetDensity = targetDensity;        options.inJustDecodeBounds = false;        options.inPreferredConfig = Bitmap.Config.RGB_565;        return options;    }    public static int calculateInSampleSize(            BitmapFactory.Options options, int reqWidth, int reqHeight) {        // Raw height and width of image        final int height = options.outHeight;        final int width = options.outWidth;        int inSampleSize = 1;        if (height > reqHeight || width > reqWidth) {            final int halfHeight = height / 2;            final int halfWidth = width / 2;            // Calculate the largest inSampleSize value that is a power of 2 and keeps both            // height and width larger than the requested height and width.            while ((halfHeight / inSampleSize) > reqHeight                    && (halfWidth / inSampleSize) > reqWidth) {                inSampleSize *= 2;            }        }        return inSampleSize;    }    public static Bitmap getBitmapFromAssets(Context context,String path){        InputStream open = null;        Bitmap bitmap = null;        try {            String temp =  path;            open = context.getAssets().open(temp);            BitmapFactory.Options options = new BitmapFactory.Options();            options = sampleBitmapOptions(context, options, 10, 10);            bitmap = BitmapFactory.decodeStream(open, null, options);            return bitmap;        } catch (Exception e) {e.printStackTrace();            return null;        }    }}

CommonUtils.java

package com.example.whiteboard.utils;import android.content.Context;import android.util.Log;import android.widget.Toast;public class CommonUtils {    public static Context mContext;    public static final String TAG_WHITEBOARD = "--whiteboard";    public static void init(Context context){        mContext = context;    }    public static void showToast(String text, int time){        if(null != mContext){            Toast.makeText(mContext, text, time).show();        }        else{            Log.e(TAG_WHITEBOARD, "--showToast--mcontext is null");        }    }    public static void destory() {         mContext = null;           }}

ScreenUtils.java

package com.example.whiteboard.utils;import android.app.Activity;import android.content.Context;import android.content.res.Configuration;import android.graphics.Point;import android.os.Build;import android.util.Log;import android.view.Display;import android.view.View;import android.view.WindowManager;import android.view.inputmethod.InputMethodManager;import java.lang.reflect.Field;/** *  屏幕工具 * Created by nereo on 15/11/19. * Updated by nereo on 2016/1/19. */public class ScreenUtils {    public static Point getScreenSize(Context context){        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);        Display display = wm.getDefaultDisplay();        Point out = new Point();        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {            display.getSize(out);        }else{            int width = display.getWidth();            int height = display.getHeight();            out.set(width, height);        }        return out;    }    /**     * 获取状态栏高度     */    public static int getStatusBarHeight(Context context) {        Class<?> c = null;        Object obj = null;        Field field = null;        int x = 0, sbar = 0;        try {            c = Class.forName("com.android.internal.R$dimen");            obj = c.newInstance();            field = c.getField("status_bar_height");            x = Integer.parseInt(field.get(obj).toString());            sbar = context.getResources().getDimensionPixelSize(x);        } catch (Exception e1) {            Log.e("getStatusBarHight()", "get status bar height fail");            e1.printStackTrace();        }        int statusBarHeight = sbar;        Log.i("onPreDraw", "statusBarHeight: "+statusBarHeight);        return statusBarHeight;    }    /**     * 获取状态栏和标题栏的高度     * @param activity     * @return     */    public static int getStatusBarAndTitleHeight(Activity activity){        if(null == activity){            return 0;        }        View view = activity.getWindow().findViewById(android.R.id.content);        if(null == view){            return 0;        }        int height = view.getTop();        return height;    }    public static void hideInput(View v) {        InputMethodManager inputManager = (InputMethodManager) v                .getContext().getSystemService(Context.INPUT_METHOD_SERVICE);        //调用系统输入法        inputManager.hideSoftInputFromWindow(v.getWindowToken(), 0);    }    public static void showInput(View v) {        InputMethodManager inputManager = (InputMethodManager) v                .getContext().getSystemService(Context.INPUT_METHOD_SERVICE);        //调用系统输入法        inputManager.showSoftInput(v, InputMethodManager.SHOW_FORCED);    }    public static void toggleInput(Context context) {        InputMethodManager inputMethodManager =                (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);        inputMethodManager.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);    }    public static int px2dip(Context context, float pxValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (pxValue / scale + 0.5f);    }    public static int dip2px(Context context, float dpValue) {        final float scale = context.getResources().getDisplayMetrics().density;        return (int) (dpValue * scale + 0.5f);    }    /**     * 返回当前屏幕是否为竖屏     * @param context     * @return     */    public static boolean isScreenOriatationPortrait(Context context) {         return context.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT;         }}

SdCardStatus.java

package com.example.whiteboard.utils;import java.io.File;import java.lang.reflect.Field;import java.lang.reflect.Method;import android.content.Context;import android.content.Intent;import android.os.Environment;import android.os.IBinder;import android.os.storage.StorageManager;import android.text.TextUtils;import android.util.Log;/** * Created by gpy on 2015/10/20. */public class SdCardStatus {    private static String CACHE_FOLDER_NAME = "WMBWhiteBoard";    private static String NONE_SD_CARD_PROMPT = "您的手机中sd卡不存在";    public static void init(String cacheFolderName) {        CACHE_FOLDER_NAME = cacheFolderName;    }    public static String getDefaulstCacheDirInSdCard() throws IllegalStateException {        String sdCardPath = null;        sdCardPath = getSDPath();        if (null == sdCardPath) {            throw new IllegalStateException(NONE_SD_CARD_PROMPT);        }        return sdCardPath + File.separator + CACHE_FOLDER_NAME;    }    /**     * when not exist sd card,return null.     *     * @return     */    public static String getSDPath() {        boolean sdCardExist = Environment.getExternalStorageState().equals(                Environment.MEDIA_MOUNTED);        if (sdCardExist) {            return Environment.getExternalStorageDirectory().getAbsolutePath();        } else {                return null;        }    }    public static int getReflactField(String className,String fieldName){        int result = -1;        try {            Class<?> clz = Class.forName(className);            Field field = clz.getField(fieldName);            field.setAccessible(true);            result = field.getInt(null);         } catch (Exception e) {            e.printStackTrace();        }        return result;    }    int title_id = getReflactField("com.android.internal.R$id", "title");    int icon_id = getReflactField("com.android.internal.R$id", "icon");//    public static StorageVolume[] getVolumeList(StorageManager storageManager){//      try {//          Class clz = StorageManager.class;//          Method getVolumeList = clz.getMethod("getVolumeList", null);//          StorageVolume[] result = (StorageVolume[]) getVolumeList.invoke(storageManager, null);//          return result;//      } catch (Exception e) {//          e.printStackTrace();//      }//      return null;//    }    public static void shutDown(){        try {            Class<?> clz = Class.forName("android.os.ServiceManager");            Log.e("wmb", "--shutDown 111");            Method getService = clz.getMethod("getService", String.class);            Log.e("wmb", "--shutDown 222");            Object powerService = getService.invoke(null, Context.POWER_SERVICE);            Log.e("wmb", "--shutDown 333");            Class<?> cStub =  Class.forName("android.os.IPowerManager$Stub");            Log.e("wmb", "--shutDown 444");            Method asInterface = cStub.getMethod("asInterface", IBinder.class);            Log.e("wmb", "--shutDown 555");            Object IPowerManager = asInterface.invoke(null, powerService);            Log.e("wmb", "--shutDown 666");            Method shutDown = IPowerManager.getClass().getMethod("shutdown", boolean.class, boolean.class);            Log.e("wmb", "--shutDown 777");            shutDown.invoke(IPowerManager, false,true);            Log.e("wmb", "--shutDown 888");        } catch (Exception e) {            Log.e("wmb", "--shutDown has an exception");            e.printStackTrace();        }    }    public static void reboot(){        try {            Class<?> clz = Class.forName("android.os.ServiceManager");            Log.e("wmb", "--shutDown 111");            Method getService = clz.getMethod("getService", String.class);            Log.e("wmb", "--shutDown 222");            Object powerService = getService.invoke(null, Context.POWER_SERVICE);            Log.e("wmb", "--shutDown 333");            Class<?> cStub =  Class.forName("android.os.IPowerManager$Stub");            Log.e("wmb", "--shutDown 444");            Method asInterface = cStub.getMethod("asInterface", IBinder.class);            Log.e("wmb", "--shutDown 555");            Object IPowerManager = asInterface.invoke(null, powerService);            Log.e("wmb", "--shutDown 666");            Method reboot = IPowerManager.getClass().getMethod("reboot", boolean.class,String.class, boolean.class);            Log.e("wmb", "--shutDown 777");            reboot.invoke(IPowerManager, false,"wmb test",true);            Log.e("wmb", "--shutDown 888");        } catch (Exception e) {            Log.e("wmb", "--shutDown has an exception");            e.printStackTrace();        }    }    public static String getVolumeState(StorageManager storageManager, String path){        String result = "";        if(null == storageManager || TextUtils.isEmpty(path)){            return result;        }        try {            Class clz = StorageManager.class;            Method getVolumeList = clz.getMethod("getVolumeState", String.class);            result = (String) getVolumeList.invoke(storageManager, path);        } catch (Exception e) {            e.printStackTrace();        }        return result;    }}

TimeUtils.java

package com.example.whiteboard.utils;import java.io.File;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Locale;/** * 时间处理工具 * Created by Nereo on 2015/4/8. */public class TimeUtils {    public static String timeFormat(long timeMillis, String pattern){        SimpleDateFormat format = new SimpleDateFormat(pattern, Locale.CHINA);        return format.format(new Date(timeMillis));    }    public static String formatPhotoDate(long time){        return timeFormat(time, "yyyy-MM-dd");    }    public static String formatPhotoDate(String path){        File file = new File(path);        if(file.exists()){            long time = file.lastModified();            return formatPhotoDate(time);        }        return "1970-01-01";    }    public static String getNowTimeString() {        SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd_hhmmss");        return sDateFormat.format(new java.util.Date());    }}

ViewUtils.java

package com.example.whiteboard.utils;import android.app.Activity;import android.view.View;public class ViewUtils {    public static  T findViewById(Activity activity, int id){        return (T) activity.findViewById(id);    }    public static  T findViewById(View view, int id){        return (T) view.findViewById(id);    }}

---

布局文件如下：

fragment_white_board.xml

<?xml version="1.0" encoding="utf-8"?>"http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#ffffff" >    "@+id/id_sketch_view"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:background="@color/green"            android:focusable="true"            android:focusableInTouchMode="true"/>    "@+id/id_controller"        android:layout_width="match_parent"        android:layout_height="50dp"        android:layout_alignParentBottom="true"        android:orientation="horizontal"        android:gravity="center"        android:background="@color/gray"        android:paddingLeft="@dimen/control_layout_padding"        android:paddingRight="@dimen/control_layout_padding"        android:paddingTop="@dimen/control_btn_padding"        android:paddingBottom="@dimen/control_btn_padding">        "@+id/id_pen"            style="@style/control_btn"            android:src="@drawable/stroke_type_rbtn_draw_checked"/>        "@+id/id_eraser"            style="@style/control_btn"            android:src="@drawable/ic_eraser"/>        "@+id/id_undo"            style="@style/control_btn"            android:src="@drawable/ic_undo"/>        "@+id/id_redo"            style="@style/control_btn"            android:src="@drawable/ic_redo"/>        "@+id/id_pic"            style="@style/control_btn"            android:src="@drawable/ic_photo"/>        "@+id/id_bacground"            style="@style/control_btn"            android:src="@drawable/ic_background"/>        "@+id/id_drag"            style="@style/control_btn"            android:src="@drawable/ic_drag"/>        "@+id/id_save"            style="@style/control_btn"            android:src="@drawable/ic_file"/>        "@+id/id_empty"            style="@style/control_btn"            android:src="@drawable/ic_empty"/>        "@+id/id_screenshot"            style="@style/control_btn"            android:src="@drawable/ic_screenshot"/>    </LinearLayout>RelativeLayout>

popup_pen.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/bg_popup"    android:orientation="vertical"     android:padding="16dp">        <TextView         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="20sp"        android:text="画笔类型"/>    <RadioGroup         android:id="@+id/pen_type_radio_group"        android:layout_width="match_parent"        android:layout_height="50dp"        android:gravity="center"        android:orientation="horizontal">        <RadioButton             android:id="@+id/type_pen"            style="@style/control_btn.nobackground"            android:checked="true"            android:button="@drawable/stroke_type_rbtn_draw"/>        <RadioButton             android:id="@+id/type_line"            style="@style/control_btn.nobackground"            android:button="@drawable/stroke_type_rbtn_line"/>        <RadioButton             android:id="@+id/type_circle"            style="@style/control_btn.nobackground"            android:button="@drawable/stroke_type_rbtn_circle"/>        <RadioButton             android:id="@+id/type_rectangle"            style="@style/control_btn.nobackground"            android:button="@drawable/stroke_type_rbtn_rectangle"/>        <RadioButton             android:id="@+id/type_text"            style="@style/control_btn.nobackground"            android:button="@drawable/stroke_type_rbtn_text"/>    RadioGroup>        <TextView         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="画笔大小"        android:textSize="20sp"/>    <LinearLayout         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:gravity="center_vertical">        <ImageView             android:id="@+id/pen_size_circle"            android:layout_width="wrap_content"            android:layout_height="match_parent"            android:src="@drawable/stroke_color_rbtn_black"/>        <SeekBar             android:id="@+id/pen_size_seek_bar"            android:layout_width="match_parent"            android:layout_height="match_parent"/>    LinearLayout>        <TextView         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="20sp"        android:text="画笔颜色"/>    <RadioGroup         android:id="@+id/pen_color_radio_group"        android:layout_width="match_parent"        android:layout_height="50dp"        android:gravity="center"        android:orientation="horizontal">        <RadioButton             android:id="@+id/color_black"            style="@style/control_btn.nobackground"            android:checked="true"            android:button="@drawable/stroke_color_rbtn_black"/>        <RadioButton             android:id="@+id/color_red"            style="@style/control_btn.nobackground"            android:button="@drawable/stroke_color_rbtn_red"/>        <RadioButton             android:id="@+id/color_green"            style="@style/control_btn.nobackground"            android:button="@drawable/stroke_color_rbtn_green"/>        <RadioButton             android:id="@+id/color_orange"            style="@style/control_btn.nobackground"            android:button="@drawable/stroke_color_rbtn_orange"/>        <RadioButton             android:id="@+id/color_blue"            style="@style/control_btn.nobackground"            android:button="@drawable/stroke_color_rbtn_blue"/>    RadioGroup>        <TextView         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="画笔透明度"        android:textSize="20sp"/>    <LinearLayout         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:gravity="center_vertical">        <ImageView             android:id="@+id/pen_alpha_circle"            android:layout_width="wrap_content"            android:layout_height="match_parent"            android:src="@drawable/stroke_color_rbtn_black"/>        <SeekBar             android:id="@+id/pen_alpha_seek_bar"            android:layout_width="match_parent"            android:layout_height="match_parent"/>    LinearLayout>LinearLayout>

popup_eraser.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/bg_popup"    android:padding="16dp"    android:minWidth="410dp"    android:orientation="vertical" >    <TextView         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="橡皮擦大小"        android:textSize="20sp"/>    <LinearLayout         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="5dp"        android:layout_marginBottom="5dp"        android:orientation="horizontal">        <ImageView             android:id="@+id/eraser_size_circle"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/circle"/>        <SeekBar             android:id="@+id/eraser_size_seek_bar"            android:layout_width="match_parent"            android:layout_height="match_parent"/>    LinearLayout>LinearLayout>

popup_text.xml

<?xml version="1.0" encoding="utf-8"?><EditText xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/text_pupwindow_et"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:hint="请输入文字"    android:imeOptions="actionDone"    android:maxWidth="200dp"    android:minWidth="120dp"    android:background="@color/gray"    android:selectAllOnFocus="true"    android:textSize="22sp" >EditText>

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