一個 SurfaceView 的測試，為何會將每次繪圖的畫面都保留

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一個 SurfaceView 的測試，為何會將每次繪圖的畫面都保留5

以下我測試 SurfaceView 功能時寫的程式，目的是讓一個載入的圖片向右移動，執行後發現圖片有隨著執行緒不斷往右繪圖，但是每次繪圖也保留了上次繪圖的資料，不知是什麼原因造成，請問各位高手能告訴我問題在哪嗎，謝謝?

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class WalkMan extends Activity {

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new MyView(this));
}

class MyView extends SurfaceView implements SurfaceHolder.Callback {

private SurfaceHolder mHandler;
private MyThread mThread;

public MyView(Context context) {

super(context);
mHandler = getHolder();
mHandler.addCallback(this);
// setFocusable(true);
mThread = new MyThread();
mThread.rs = this.getContext().getResources();
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {

Log.d("g", "Changed");
}

@Override
public void surfaceCreated(SurfaceHolder holder) {

mThread.start();
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {

Log.d("g", "Destroyed");
mThread.finish();
}

private class MyThread extends Thread {

private boolean running;
private Canvas c;
private Paint p;
public Resources rs;
Bitmap bmp;

@Override
public void run() {

// try {
// Thread.sleep(1000);
// } catch (InterruptedException e) {
// }
running = true;
p = new Paint();
bmp = BitmapFactory.decodeResource(rs, R.drawable.click1);
while (running) {

draw();
// Log.d("g", String.valueOf(i++));
}
}

private void finish() {
running = false;
}

int i = 0;
private void draw() {

// Log.d("g", String.valueOf(bmp.getWidth()));

c = mHandler.lockCanvas();
c.drawBitmap(bmp, 10 + i, 10, p);
mHandler.unlockCanvasAndPost(c);
i++;
}
}
}
}

Android