Android：使用新数据刷新位图

Question

我试图创建随机像素颜色的15fps“位图视频”。以下代码正确显示一个位图，但不会使用新的随机图像更新/刷新图像。任何人都可以请帮我弄清楚为什么？

public class ViewThread extends Thread { 
    private SurfaceHolder mHolder; 
    private Panel mPanel; 
    private boolean mRun = false; 

    public ViewThread(Panel panel) { 
     mPanel = panel; 
     mHolder = mPanel.getHolder(); 
    } 

    public void setRunning(boolean run) { 
     mRun = run; 
    } 

    @Override 
    public void run() { 
     Canvas canvas = null; 
     while (mRun) { 
      canvas = mHolder.lockCanvas(); 
      if (canvas != null) { 
       mPanel.doDraw(canvas); 
       mHolder.unlockCanvasAndPost(canvas); 
      } 
     } 
    } 
} 

public class Panel extends SurfaceView implements SurfaceHolder.Callback { 
    private ViewThread mThread; 
    private Bitmap mBitmap; 
    private int[] mcolors; 

    public Panel(Context context) { 
     super(context); 
     init(); 
    } 

    private void init() { 
     getHolder().addCallback(this); 
     mThread = new ViewThread(this); 

     // create a graphic 
     mcolors = colorMap(); 
     int[] colors = mcolors; 
     mBitmap = Bitmap.createBitmap(colors, 64, 64, Bitmap.Config.ARGB_8888); 
     mBitmap = Bitmap.createScaledBitmap(mBitmap, 256, 256, false); 
    } 

    protected void doDraw(Canvas canvas) { 
     canvas.drawColor(Color.BLACK); 
     canvas.drawBitmap(mBitmap, 8, 8, null); 
    } 

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

    //@Override 
    public void surfaceCreated(SurfaceHolder holder) { 
     if (!mThread.isAlive()) { 
      mThread = new ViewThread(this); 
      mThread.setRunning(true); 
      mThread.start(); 
     } 
    } 

    public void surfaceDestroyed(SurfaceHolder holder) { 
     if (mThread.isAlive()) { 
      mThread.setRunning(false); 
     } 
    } 
} 

private static int[] colorMap() { 

    int[] ltable = { 0xff000000, 0xff00000f, 0xff00001e, 0xff00002d, 0xff00003c, 0xff00004b, 
        0xff00005a, 0xff000069, 0xff000078, 0xff000087, 0xff000096, 0xff0000a5, 
        0xff0000b4, 0xff0000c3, 0xff0000d2, 0xff0000e1, 0xff0000f0, 0xff0000ff, 
        0xff0f00ff, 0xff1e00ff, 0xff2d00ff, 0xff3c00ff, 0xff4b00ff, 0xff5a00ff, 
        0xff6900ff, 0xff7800ff, 0xff8700ff, 0xff9600ff, 0xffa500ff, 0xffb400ff, 
        0xffc300ff, 0xffd200ff, 0xffe100ff, 0xfff000ff, 0xffff00ff, 0xffff00f0, 
        0xffff00e1, 0xffff00d2, 0xffff00c3, 0xffff00b4, 0xffff00a5, 0xffff0096, 
        0xffff0087, 0xffff0078, 0xffff0069, 0xffff005a, 0xffff004b, 0xffff003c, 
        0xffff002d, 0xffff001e, 0xffff000f, 0xffff0000 }; 

    int[] mcolors = new int[4096]; 
    Random rand = new Random(); 

    for(int i=0; i < 4096; i++) 
    { 
     int num = rand.nextInt(52); 
     mcolors[i] = ltable[num]; 
    } 

    return mcolors; 
} 

}

Answer 1

在我看来，你在呼唤你的线程only once when surfaceCreated()被调用。之后，你的线程再也不会被调用。我相信你需要类似timer and reinitiate thread or call thread run() method to display another image。

[编辑]

一些其他的东西

1）重新画布持有人在每个while循环。

while (run) { 
     c = null; 
     try { 
      c = panel.getHolder().lockCanvas(); 

2）此外，机器人1.5后surfaceview不能每秒刷新更40-45时间，以便尝试减少FPS至30，看看它是否有什么差别。

例子：http://www.anddev.org/android-2d-3d-graphics-opengl-problems-f55/surfaceview-portage-1-5-other-version-of-android-t15675.html