Android实现移动小球和CircularReveal页面切换动画实例代码

 floatingActionButton.setOnTouchListener(new View.OnTouchListener() {  @Override  public boolean onTouch(View view, MotionEvent ev) {  switch (ev.getAction()) {   case MotionEvent.ACTION_DOWN:   downX = ev.getX();   downY = ev.getY();   isClick = true;   break;   case MotionEvent.ACTION_MOVE:   isClick = false;   moveX = ev.getX();   moveY = ev.getY();   int offsetX = (int) (moveX - downX);   int offsetY = (int) (moveY - downY);   //这里使用了setTranslation来移动view。。。尝试过layout。不知道为什么fragment切换回来的时候会恢复原位   floatingActionButton.setTranslationX(floatingActionButton.getTranslationX() + offsetX);   floatingActionButton.setTranslationY(floatingActionButton.getTranslationY() + offsetY);   break;   case MotionEvent.ACTION_UP:   //用来触发点击事件   if (isClick) {    startAct();    return false;   }   //用来判断移动边界   if (floatingActionButton.getX() < 0) {    floatingActionButton.setX(0);   }   if (floatingActionButton.getX() + floatingActionButton.getWidth() > ScreenUtil.getScreenWidth(getContext())) {    floatingActionButton.setX(ScreenUtil.getScreenWidth(getContext()) - floatingActionButton.getWidth());   }   if (floatingActionButton.getY() < titleHeight) {    floatingActionButton.setY(0);   }   if (floatingActionButton.getY() + floatingActionButton.getHeight() + titleHeight >    getActivity().findViewById(R.id.activity_main_mainLl).getHeight() - getActivity().findViewById(R.id.fc_rg).getHeight()) {    floatingActionButton.setY(getBottomY());   }   break;  }  return true;  }  private void startAct() {  //跳转Activity,传递动画参数  Intent intent = new Intent(getActivity(), CheckWorkActivity.class);  intent.putExtra("x", (int) floatingActionButton.getX() + floatingActionButton.getWidth() / 2);  intent.putExtra("y", (int) floatingActionButton.getY() + floatingActionButton.getHeight() / 2);  intent.putExtra("start_radius", floatingActionButton.getWidth() / 2);  intent.putExtra("end_radius", DialogFragment.this.view.getHeight());  startActivity(intent);  } });