VIEW双缓冲

import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Bitmap.Config;import android.graphics.drawable.BitmapDrawable;import android.view.View;/** * @version 2012-8-15 上午10:06:07 **/public class GameView extends View implements Runnable {    Bitmap bit = null;    Paint mPaint = null;    // 创建一个缓冲区    Bitmap mSCBitmap = null;    // 创建Canvas    Canvas mCanvas = null;    public GameView(Context context) {        super(context);        // 装载资源        bit = ((BitmapDrawable) getResources().getDrawable(R.drawable.icon))                .getBitmap();        // 创建屏幕大小缓冲区        mSCBitmap = Bitmap.createBitmap(480, 800, Config.ARGB_8888);        // 创建Canvas        mCanvas = new Canvas();        // 将内容绘制在mSCBitmap        mCanvas.setBitmap(mSCBitmap);        mPaint = new Paint();        // bit绘制在mSCBitmap        mCanvas.drawBitmap(bit, 0, 0, mPaint);        new Thread(this).start();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        // 将mSCBitmap显示在屏幕上        canvas.drawBitmap(mSCBitmap, 0, 0, mPaint);    }    @Override    public void run() {        while(!Thread.currentThread().isInterrupted()) {            try {                Thread.sleep(100);            }            catch(Exception e) {                Thread.currentThread().interrupt();            }            postInvalidate();        }    }}