SurfaceView帧率非常低

Question

当使用SurfaceView时，我得到大约6 FPS，当时我几乎什么都没画。

我只画一种颜色。所以几乎没有绘图操作，我得到6 fps，这是非常可怕的。

然而有一点需要注意的是，我正在使用模拟器（genymotion模拟器）并且没有在真实设备上尝试过。然而，即使有一个模拟器，当我什么都没画时，我应该超过6 fps ..

所以这是我的代码（不包括import语句）：

//Activity class which starts the SurfaceView
public class MainActivity extends Activity {

    SView surfaceView;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        surfaceView = new SView(this);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(surfaceView);
    }    
}

//SurfaceView class which draws everything in another thread
class SView extends SurfaceView implements SurfaceHolder.Callback{

    SurfaceHolder holder;
    Canvas mainCanvas;
    Paint mainPaint;
    int width;
    long start, end, fps;

    public SView(Context context) {
        super(context);
        holder = getHolder();
        holder.addCallback(this);
        mainPaint = new Paint();
        mainPaint.setColor(Color.BLACK);
        fps = 0;

    }

    public void surfaceCreated(SurfaceHolder holder) {

        new Thread(){
            public void run() {
                start = System.currentTimeMillis();
                while (true) {
                    end = System.currentTimeMillis();
                    if ((end - start) >= 1000) {
                        Log.d("PERSONAL", "FPS: " + fps + "    milliseconds " + Long.toString(end - start));
                        start = System.currentTimeMillis();
                        fps = 0;
                    }
                    customDraw();
                }
            }
        }.start();
    }

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

    public void surfaceDestroyed(SurfaceHolder holder) {    
    }

    public void customDraw(){
        mainCanvas = holder.lockCanvas();
        mainCanvas.drawRGB(0,150,0);
        fps++;
        holder.unlockCanvasAndPost(mainCanvas);
    }
}

所以我的问题是如何解决这个可怕的fps这个问题？