android如何处理动画线程

Question

我该如何处理throw any object(Stone)continuously到moving Horizontally object？ 我已经使用了一个线程，可以使用翻译动画连续扔石头，但内存使用量非常大，我的设备在3-4分钟后变慢。如何解决dis问题？

Answer 1

我认为你最好实施自己的SurfaceView。在其中，您可以绘制动画对象（使用专用线程），比使用视图动画更加自由。 （您当然必须重写代码的一部分，但从长远来看可能是最好的）。
如果你觉得你想试试SurfaceView，我建议你通过android的Lunar Lander例子来看看。

实施例：

public class ThrowView extends SurfaceView implements SurfaceHolder.Callback, OnGestureListener{ 
    //The OnGestureListener can detect a fling motion. 
    private class DrawingThread extends Thread{ 
     private final float timefactor = 0.0001f; //This is used to make the animation a bit slower. Play with this value if the animation seems too be to slow or too fast. 
     private final float damp = 0.9; //This is used to slow down the object. If it stops too fast or slow, this is the value to change. 
     private float stoneX = 0; //The x-coordinate of our stone object. Use this when drawing. 
     private float stoneY = 0; //The y-coordinate of our stone object. Use this when drawing. 
     @Override 
     public void run(){ 
      while(running){ 
      Canvas c = null; 
      try{ 
       c = surfaceHolder.lockCanvas(null); 
       synchronized (surfaceHolder) { 
        updatePhysics(); 
        doDraw(c); //doDraw is not in this example, but it should essentially just draw our object at stoneX, stoneY. 
       } 
      }finally{ 
       if(c!=null) surfaceHolder.unlockCanvasAndPost(c); 
      } 
      SystemClock.sleep(40); 
     } 
     private void updatePhysics(long time){ 
      //Calculate how much time has passed since last step: 
      time1 = System.currentTimeMillis(); 
      dT = (time1 - time2)*timefactor; 
      time2 = time1; 

      //Move the stone in x depending on the time and velocity: 
      stoneX += vX*dT; 
      //Decrease the velocity: 
      vX -= dT*damp: 
     } 
    } 
    protected volatile float vX = 0; //This is the x-speed. To be able to throw in y too, just make another variable for that. 
    @Override 
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { 
     //This is our onFling, here we take the velocity of the users fling and set our variable to that. 
     //Note that this value is based on pixels. 
     vX = velocityX; 
     return true; 
    } 
    @Override 
    public boolean onDown(MotionEvent e) { 
     //The onDown should return true so onFling can be activated: 
     return true; 
    } 
} 

这个例子是根据月球着陆样品易于使用的制造。许多方法（在这个例子中不需要）在这里省略，但可以根据Lunar Lander来实现。