android实现涂鸦，保存涂鸦后的图片，清屏

自定义view的类，代码如下：
[html]
package com.xy.tuya;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class MyView extends View {
private Paint paint = null;
private Bitmap originalBitmap = null;
private Bitmap new1Bitmap = null;
private Bitmap new2Bitmap = null;
private float clickX = 0, clickY = 0;
private float startX = 0, startY = 0;
private boolean isMove = true;
private boolean isClear = false;
private int color = Color.GREEN;
private float strokeWidth = 2.0f;

public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
originalBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.a1).copy(Bitmap.Config.ARGB_8888, true);
new1Bitmap = Bitmap.createBitmap(originalBitmap);
setDrawingCacheEnabled(true);
Log.i("RG", "new1Bitmap--->>>" + new1Bitmap);
}

public void clear() {
isClear = true;
new2Bitmap = Bitmap.createBitmap(originalBitmap);
invalidate();
}

Bitmap saveImage = null;

public Bitmap saveImage() {
if (saveImage == null) {
return null;
}
return saveImage;
}

public void setImge() {
saveImage = null;
}

public void setstyle(float strokeWidth) {
this.strokeWidth = strokeWidth;
}

Handler handler1;

@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(HandWriting(new1Bitmap), 0, 0, null);
handler1 = new Handler() {

@Override
public void handleMessage(Message msg) {

Log.i("RG", "--------------------");
int what = msg.what;
if (what == 2) {
saveImage = Bitmap.createBitmap(HandWriting(new1Bitmap));
Message msg1 = new Message();
msg1 = Message.obtain(MainActivity.hh, 3);
MainActivity.hh.sendMessage(msg1);
}
super.handleMessage(msg);
}

};

}

@SuppressLint("HandlerLeak")
Handler handler;

public Bitmap HandWriting(Bitmap originalBitmap) {
handler = new Handler() {

@Override
public void handleMessage(Message msg) {

int what = msg.what;
if (what == 1) {
startX = clickX;
startY = clickY;
}
super.handleMessage(msg);
}

};
Canvas canvas = null;

if (isClear) {
canvas = new Canvas(new2Bitmap);
Log.i("RG", "canvas ");
} else {
canvas = new Canvas(originalBitmap);
}
paint = new Paint();
paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
paint.setColor(color);
paint.setStrokeWidth(strokeWidth);
Log.i("RG", "startX-->>>>" + startX);
Log.i("RG", "startY-->>>>" + startY);
if (isMove) {
canvas.drawLine(startX, startY, clickX, clickY, paint);
}

if (isClear) {
return new2Bitmap;
}

return originalBitmap;
}

@Override
public boolean onTouchEvent(MotionEvent event) {
Message msg = new Message();
msg = Message.obtain(handler, 1);
handler.sendMessage(msg);
clickX = event.getX();
clickY = event.getY();
if (event.getAction() == MotionEvent.ACTION_DOWN) {

isMove = false;
invalidate();
return true;
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {

isMove = true;
invalidate();
return true;
}

return super.onTouchEvent(event);
}

}

mainactiviry类，代码如下：
[html]
package com.xy.tuya;

import android.opengl.Visibility;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.support.v4.app.NavUtils;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
private MyView handWrite = null;
private Button clear = null;
private Button save = null;
private ImageView saveImage = null;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

handWrite = (MyView) findViewById(R.id.handwriteview);
save = (Button) findViewById(R.id.save);
saveImage = (ImageView) findViewById(R.id.saveimage);
clear = (Button) findViewById(R.id.clear);
clear.setOnClickListener(new clearListener());
save.setOnClickListener(new saveListener());
handerl();
}

private class clearListener implements OnClickListener {

public void onClick(View v) {
handWrite.clear();
}
}

static Handler hh;

public void handerl() {
hh = new Handler() {

@Override
public void handleMessage(Message msg) {
int what = msg.what;
if (what == 3) {
saveImage.setVisibility(View.VISIBLE);
saveImage.setImageBitmap(handWrite.saveImage());
handWrite.setImge();
}
super.handleMessage(msg);
}

};
}

private class saveListener implements OnClickListener {

@Override
public void onClick(View v) {

Message msg = new Message();
msg = Message.obtain(handWrite.handler1, 2);
handWrite.handler1.sendMessage(msg);

if (handWrite.saveImage() != null) {
Log.i("RG", "111111111111111111111");

} else {
saveImage.setVisibility(View.GONE);
}
}

}
}

xml布局代码如下：
[html]
< ?xml version="1.0" encoding="utf-8"?>
< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >

<com.zte.tuya.MyView
android:id="@+id/handwriteview"
android:layout_width="fill_parent"
android:layout_height="300dp" />
</LinearLayout>

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="40dip"
android:orientation="horizontal" >

<Button
android:id="@+id/clear"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:text="清屏" />

<Button
android:id="@+id/save"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:text="保存" />
</LinearLayout>

<ImageView
android:id="@+id/saveimage"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

< /LinearLayout>

下过图如下：

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