Android 双缓冲

SurfaceView本来就是采用双缓冲的技术实现的，所以此处只练习View的双缓冲使用

package com.Aina.Android;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.view.View;

/**
 * com.Aina.Android Pro_Canvas
 * 
 * @author Aina.huang E-mail: [e-mail]
 * @version 创建时间：2010 Jun 17, 2010 3:14:33 PM 类说明
 */
public class GameView extends View {

	private Bitmap mBitmap = null;
	private Bitmap mBitmap2 = null;
	private Canvas mCanvas = null;
	private Paint mPaint = null;

	public GameView(Context context) {
		super(context);
		mBitmap = ((BitmapDrawable) this.getResources().getDrawable(
				R.drawable.img)).getBitmap();
		mBitmap2 = Bitmap.createBitmap(320, 480, Config.ARGB_8888);//创建屏幕大小的缓冲区
		mCanvas = new Canvas();
		mCanvas.setBitmap(mBitmap2);//设置将内容绘制在mBitmap2上面
		mPaint  = new Paint();
		mCanvas.drawBitmap(mBitmap, 0, 0, mPaint);//将图片绘制到缓冲屏幕上面
	}

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		canvas.drawBitmap(mBitmap2, 0, 0, mPaint);
	}

}

package com.Aina.Android;

import android.app.Activity;
import android.os.Bundle;

public class Test_Canvas extends Activity {
    /** Called when the activity is first created. */
	private GameView gv = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        gv = new GameView(this);
        setContentView(gv);
    }
}