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   源码介绍

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package com.example.guale;

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.Path;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class EraseView extends View {
	
	private boolean isMove = false;
	private Bitmap bitmap = null;
	private Bitmap frontBitmap = null;
	private Path path;
	private Canvas mCanvas;
	private Paint paint;
	
	
	public EraseView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}
	@Override
	protected void onDraw(Canvas canvas) {
		
	    if (mCanvas == null) {
		    EraseBitmp();
	    } 
		canvas.drawBitmap(bitmap, 0, 0, null);	
		mCanvas.drawPath(path,paint);
		super.onDraw(canvas);
	}
	
	public void EraseBitmp() {
		
		bitmap = Bitmap.createBitmap(getWidth(),getHeight(), Bitmap.Config.ARGB_4444);
		
		frontBitmap = CreateBitmap(Color.GRAY,getWidth(),getHeight());

		paint = new Paint();
		paint.setStyle(Paint.Style.STROKE);
		paint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));
		paint.setAntiAlias(true);
		paint.setDither(true);
		paint.setStrokeJoin(Paint.Join.ROUND);
		paint.setStrokeCap(Paint.Cap.ROUND);
		paint.setStrokeWidth(20);
		
		path = new Path();

		mCanvas = new Canvas(bitmap);
		mCanvas.drawBitmap(frontBitmap, 0, 0,null);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		// TODO Auto-generated method stub
		
		float ax = event.getX();
		float ay = event.getY();
		
		if (event.getAction() == MotionEvent.ACTION_DOWN) {
			isMove = false;
			path.reset();
			path.moveTo(ax, ay);
			invalidate();
			return true;
		} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
			isMove = true;
			path.lineTo(ax,ay);
			invalidate();
			return true;
		}
		return super.onTouchEvent(event);
	}
	
	public  Bitmap CreateBitmap(int color,int width, int height) {
		int[] rgb = new int [width * height];
		
		for (int i=0;i<rgb.length;i  ) {
			rgb[i] = color;
		}
		
		return Bitmap.createBitmap(rgb, width, height,Config.ARGB_8888);
	}
	
}