android 图片画画板

canvas.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:orientation="vertical"        >    <Button            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:text="保存"            android:onClick="save"            />    <ImageView            android:id="@+id/image"            android:layout_width="480px"            android:layout_height="320px"            /></LinearLayout>

package com.example.imageLoadBigImg;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.view.MotionEvent;import android.view.View;import android.widget.ImageView;import android.widget.Toast;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;/** * 图片画板 * Created by Heyiyong on 2014-4-11 下午1:58. */public class ImageCanvasActivity extends Activity {    private ImageView imageView;    private Bitmap bitmap;    private Canvas canvas;    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.canvas);        imageView = (ImageView) findViewById(R.id.image);        //创建画笔样式        final Paint paint = new Paint();        paint.setColor(Color.RED);        //创建一个可修改的bitmap        bitmap = Bitmap.createBitmap(480, 320, Bitmap.Config.ARGB_4444);        //以bitmap为模板，创建画板对象        canvas = new Canvas(bitmap);        canvas.drawColor(Color.WHITE);        imageView.setOnTouchListener(new View.OnTouchListener() {            int startX;            int startY;            @Override            public boolean onTouch(View v, MotionEvent event) {                switch (event.getAction()) {                    case MotionEvent.ACTION_DOWN://按下的时候                        startX = (int) event.getX();                        startY = (int) event.getY();                        break;                    case MotionEvent.ACTION_MOVE://移动的时候                        int newX = (int) event.getX();                        int newY = (int) event.getY();                        canvas.drawLine(startX, startY, newX, newY, paint);                        //重置初始位置                        startX = newX;                        startY = newY;                        //将画板的图片设置上去                        imageView.setImageBitmap(bitmap);                        break;                    case MotionEvent.ACTION_UP://手放开的时候                        break;                }                return true;            }        });    }    public void save(View view) {        try {            File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg");            FileOutputStream fos = new FileOutputStream(file);            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);//第一个参数为图片格式            fos.close();            Toast.makeText(this, "保存图片成功", 2000).show();            //模拟消息：SD卡被重新挂载了            Intent intent = new Intent();            intent.setAction(intent.ACTION_MEDIA_MOUNTED);            intent.setData(Uri.fromFile(Environment.getExternalStorageDirectory()));            sendBroadcast(intent);        } catch (FileNotFoundException e) {            Toast.makeText(this, "保存图片失败", 2000).show();            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

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