Android贝塞尔曲线实现消息拖拽消失

private Path getBezeierPath() {
  double distance = getDistance(mBigCirclePoint,mLittleCirclePoint);
 
  mLittleCircleRadius = (int) (mLittleCircleRadiusMax - distance / 10);
  if (mLittleCircleRadius 

public class MsgDrafitingView extends View{
 
 private PointF mLittleCirclePoint;
 private PointF mBigCirclePoint;
 private Paint mPaint;
 //大圆半径
 private int mBigCircleRadius = 10;
 //小圆半径
 private int mLittleCircleRadiusMax = 10;
 private int mLittleCircleRadiusMin = 2;
 private int mLittleCircleRadius;
 private Bitmap dragBitmap;
 private OnToucnUpListener mOnToucnUpListener;
 
 
 public MsgDrafitingView(Context context) {
  this(context,null);
 }
 
 public MsgDrafitingView(Context context, @Nullable AttributeSet attrs) {
  this(context, attrs,0);
 }
 
 public MsgDrafitingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  mBigCircleRadius = dip2px(mBigCircleRadius);
  mLittleCircleRadiusMax = dip2px(mLittleCircleRadiusMax);
  mLittleCircleRadiusMin = dip2px(mLittleCircleRadiusMin);
  mPaint = new Paint();
  mPaint.setColor(Color.RED);
  mPaint.setAntiAlias(true);
  mPaint.setDither(true);
 }
 
 private int dip2px(int dip) {
  return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,dip,getResources().getDisplayMetrics());
 }
 
 @Override
 protected void onDraw(Canvas canvas) {
  if (mBigCirclePoint == null || mLittleCirclePoint == null) {
   return;
  }
  //画大圆
  canvas.drawCircle(mBigCirclePoint.x, mBigCirclePoint.y, mBigCircleRadius, mPaint);
  //获得贝塞尔路径
  Path bezeierPath = getBezeierPath();
  if (bezeierPath!=null) {
   // 小到一定层度就不见了（不画了）
   canvas.drawCircle(mLittleCirclePoint.x, mLittleCirclePoint.y, mLittleCircleRadius, mPaint);
   // 画贝塞尔曲线
   canvas.drawPath(bezeierPath, mPaint);
  }
  // 画图片
  if (dragBitmap != null) {
   canvas.drawBitmap(dragBitmap, mBigCirclePoint.x - dragBitmap.getWidth() / 2,
     mBigCirclePoint.y - dragBitmap.getHeight() / 2, null);
  }
 }
 
 private Path getBezeierPath() {
  double distance = getDistance(mBigCirclePoint,mLittleCirclePoint);
 
  mLittleCircleRadius = (int) (mLittleCircleRadiusMax - distance / 10);
  if (mLittleCircleRadius  mLittleCircleRadiusMin) {
   // 回弹 ValueAnimator 值变化的动画 0 变化到 1
   ValueAnimator animator = ObjectAnimator.ofFloat(1);
   animator.setDuration(250);
   final PointF start = new PointF(mBigCirclePoint.x, mBigCirclePoint.y);
   final PointF end = new PointF(mLittleCirclePoint.x, mLittleCirclePoint.y);
   animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
     float percent = (float) animation.getAnimatedValue();// 0 - 1
     PointF pointF = Utils.getPointByPercent(start, end, percent);
     //更新位子
     updatePoint(pointF.x, pointF.y);
    }
   });
   // 设置一个差值器 在结束的时候回弹
   animator.setInterpolator(new OvershootInterpolator(3f));
   animator.start();
   // 还要通知 TouchListener
   animator.addListener(new AnimatorListenerAdapter() {
    @Override
    public void onAnimationEnd(Animator animation) {
     if(mOnToucnUpListener != null){
      mOnToucnUpListener.restore();
     }
    }
   });
  } else {
   // 爆炸
   if(mOnToucnUpListener != null){
    mOnToucnUpListener.dismiss(mBigCirclePoint);
   }
  }
 }
}

public class MsgDrafitingListener implements View.OnTouchListener {
 
 private WindowManager mWindowManager;
 private WindowManager.LayoutParams params;
 private MsgDrafitingView mMsgDrafitingView;
 private Context context;
 // 爆炸动画
 private FrameLayout mBombFrame;
 private ImageView mBombImage;
 private BubbleDisappearListener mDisappearListener;
 
 public MsgDrafitingListener(Context context,BubbleDisappearListener disappearListener)
 {
  mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
  params = new WindowManager.LayoutParams();
  mMsgDrafitingView = new MsgDrafitingView(context);
  //背景透明
  params.format = PixelFormat.TRANSPARENT;
  this.cOntext= context;
 
  mBombFrame = new FrameLayout(context);
  mBombImage = new ImageView(context);
  mBombImage.setLayoutParams(new FrameLayout.LayoutParams(Utils.dip2px(30,context),
    Utils.dip2px(30,context)));
  mBombFrame.addView(mBombImage);
  this.mDisappearListener = disappearListener;
 }
 
 
 @Override
 public boolean onTouch(final View view, MotionEvent motionEvent) {
 
  switch (motionEvent.getAction())
  {
   case MotionEvent.ACTION_DOWN:
    //隐藏自己
    view.setVisibility(View.INVISIBLE);
    mWindowManager.addView(mMsgDrafitingView,params);
    int[] location = new int[2];
    view.getLocationOnScreen(location);
    Bitmap bitmap = getBitmapByView(view);
    //y轴需要减去状态栏的高度
    mMsgDrafitingView.initPoint(location[0] + view.getWidth() / 2,
      location[1]+view.getHeight()/2 -Utils.getStatusBarHeight(context));
    // 给消息拖拽设置一个Bitmap
    mMsgDrafitingView.setDragBitmap(bitmap);
    //设置OnTouchUpListener
    mMsgDrafitingView.setOnToucnUpListener(new MsgDrafitingView.OnToucnUpListener() {
     @Override
     public void restore() {
      //还原位子
      // 把消息的View移除
      mWindowManager.removeView(mMsgDrafitingView);
      // 把原来的View显示
      view.setVisibility(View.VISIBLE);
     }
 
     @Override
     public void dismiss(PointF pointF) {
      //爆炸效果
      // 要去执行爆炸动画 （帧动画）
      //移除拖拽的view
      mWindowManager.removeView(mMsgDrafitingView);
      // 要在 mWindowManager 添加一个爆炸动画
      mWindowManager.addView(mBombFrame,params);
      mBombImage.setBackgroundResource(R.drawable.anim_bubble_pop);
 
      AnimationDrawable drawable = (AnimationDrawable) mBombImage.getBackground();
      mBombImage.setX(pointF.x-drawable.getIntrinsicWidth()/2);
      mBombImage.setY(pointF.y-drawable.getIntrinsicHeight()/2);
      drawable.start();
      // 等它执行完之后我要移除掉这个 爆炸动画也就是 mBombFrame
      mBombImage.postDelayed(new Runnable() {
       @Override
       public void run() {
        mWindowManager.removeView(mBombFrame);
        // 通知一下外面该消失
        if(mDisappearListener != null){
         mDisappearListener.dismiss(view);
        }
       }
      },getAnimationDrawableTime(drawable));
     }
    });
    break;
   case MotionEvent.ACTION_MOVE:
    mMsgDrafitingView.updatePoint(motionEvent.getRawX(),
      motionEvent.getRawY() - Utils.getStatusBarHeight(context));
    break;
   case MotionEvent.ACTION_UP:
    mMsgDrafitingView.OnTouchUp();
    break;
  }
  return true;
 }
 
 private Bitmap getBitmapByView(View view) {
  view.buildDrawingCache();
  Bitmap bitmap = view.getDrawingCache();
  return bitmap;
 }
 
 
 public interface BubbleDisappearListener {
  void dismiss(View view);
 }
 
 /**
  * 获取爆炸动画画的时间
  * @param drawable
  * @return
  */
 private long getAnimationDrawableTime(AnimationDrawable drawable) {
  int numberOfFrames = drawable.getNumberOfFrames();
  long time = 0;
  for (int i=0;i

public class MsgDrafitingViewActivity extends AppCompatActivity{
 private Button mButton;
 private TextView mText;
 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.qq_msg_drafitingview_activity);
  mButton = findViewById(R.id.mBtn);
  mText = findViewById(R.id.mText);
  MsgDrafitingView.attach(mButton, new MsgDrafitingListener.BubbleDisappearListener() {
   @Override
   public void dismiss(View view) {
 
   }
  });
  MsgDrafitingView.attach(mText, new MsgDrafitingListener.BubbleDisappearListener() {
   @Override
   public void dismiss(View view) {
 
   }
  });
 }
}