Android DrawBitmap绘制图像

package com.Aina.Android;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.view.KeyEvent;
import android.view.View;

public class GameView extends View implements Runnable {

	private Paint mPaint;
	private Bitmap mBitqq;
	private Bitmap mBitDestTop;
	private int movex = 0;
	private int DisplayWidth;//屏幕宽带
	private int DisplayHeight;//屏幕高度

	public GameView(Context context,int DisplayWidth,int DisplayHeight) {
		super(context);
		this.DisplayWidth = DisplayWidth;
		this.DisplayHeight = DisplayHeight;
		mPaint = new Paint();
		mBitqq = ((BitmapDrawable) this.getResources().getDrawable(
				R.drawable.qq)).getBitmap();
		mBitDestTop = ((BitmapDrawable) this.getResources().getDrawable(
				R.drawable.desktop)).getBitmap();
		new Thread(this).start();

	}

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		canvas.drawColor(Color.BLACK);// 清屏
		canvas.drawBitmap(mBitqq, 0, 0, mPaint);
		this.DrawImage(canvas, mBitDestTop, movex, mBitqq.getHeight() + 2,
				mBitDestTop.getWidth(), mBitDestTop.getHeight(), 0,0);
	}

	@Override
	public void run() {
		while (!Thread.interrupted()) {
			try {
				Thread.sleep(100);
			} catch (Exception ex) {
				ex.printStackTrace();
				Thread.currentThread().interrupt();
			}
			this.postInvalidate();
		}
	}

	/**
	 * x:屏幕上的x坐标 y:屏幕上的y坐标 w:要绘制的图片的宽度 h:要绘制的图片的高度 bx:图片上的x坐标 by:图片上的y坐标
	 * 
	 * @param canvas
	 * @param mBitmap
	 * @param x
	 * @param y
	 * @param w
	 * @param h
	 * @param bx
	 * @param by
	 */
	public void DrawImage(Canvas canvas, Bitmap mBitmap, int x, int y, int w,
			int h, int bx, int by) {
		Rect src = new Rect();// 图片裁剪区域
		Rect dst = new Rect();// 屏幕裁剪区域
		src.left = bx;
		src.top = by;
		src.right = bx + w;
		src.bottom = by + h;

		dst.left = x;
		dst.top = y;
		dst.right = x + w;
		dst.bottom = y + h;

		canvas.drawBitmap(mBitmap, src, dst, mPaint);
		src = null;
		dst = null;
	}

	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
			if (this.movex > 0) {
				this.movex -= 5;
			}
		} else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
			if (this.movex + this.mBitDestTop.getWidth() < this.DisplayWidth) {
				this.movex += 5;
			}
		}
		return super.onKeyDown(keyCode, event);
	}
}

package com.Aina.Android;

import android.app.Activity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.KeyEvent;

public class Test_DrawBitmap extends Activity {
    /** Called when the activity is first created. */
	private GameView gv = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        DisplayMetrics dm = new DisplayMetrics();
        this.getWindowManager().getDefaultDisplay().getMetrics(dm);        
        gv = new GameView(this,dm.widthPixels,dm.heightPixels);
        setContentView(gv);
    }
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		return gv.onKeyDown(keyCode, event);
	}

}