我编辑了thiscode将Rect实例移出onDraw方法。我已经在多种设备上对其进行了测试。publicclassBallBouncesActivityextendsActivity{BallBouncesball;@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);ball=newBallBounces(this);setContentView(ball);}}classBallBouncesextendsSurfaceViewimplementsSurfa