Android未读消息拖动气泡示例代码详解(附源码)

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@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
 super.onSizeChanged(w, h, oldw, oldh);

 init(w, h);
}

private void init(int w, int h) {
 mBubbleState = BUBBLE_STATE_DEFAULT;

 //设置固定气泡圆心初始坐标
 if (mBubFixedCenter == null) {
 mBubFixedCenter = new PointF(w / 2, h / 2);
 } else {
 mBubFixedCenter.set(w / 2, h / 2);
 }
 //设置可动气泡圆心初始坐标
 if (mBubMovableCenter == null) {
 mBubMovableCenter = new PointF(w / 2, h / 2);
 } else {
 mBubMovableCenter.set(w / 2, h / 2);
 }
}

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//静止，连接，分离状态都需要绘制圆背景以及文本
if (mBubbleState != BUBBLE_STATE_DISMISS) {
 canvas.drawCircle(mBubMovableCenter.x, mBubMovableCenter.y, mBubMovableRadius, mBubblePaint);
 mTextPaint.getTextBounds(mTextStr, 0, mTextStr.length(), mTextRect);
 canvas.drawText(mTextStr, mBubMovableCenter.x - mTextRect.width() / 2, mBubMovableCenter.y + mTextRect.height() / 2, mTextPaint);
}

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if (mBubbleState == BUBBLE_STATE_CONNECT) {
 //绘制静止的气泡
 canvas.drawCircle(mBubFixedCenter.x, mBubFixedCenter.y, mBubFixedRadius, mBubblePaint);
 //计算控制点的坐标
 int iAnchorX = (int) ((mBubMovableCenter.x + mBubFixedCenter.x) / 2);
 int iAnchorY = (int) ((mBubMovableCenter.y + mBubFixedCenter.y) / 2);

 float sinTheta = (mBubMovableCenter.y - mBubFixedCenter.y) / mDist;
 float cosTheta = (mBubMovableCenter.x - mBubFixedCenter.x) / mDist;

 //D
 float iBubFixedStartX = mBubFixedCenter.x - mBubFixedRadius * sinTheta;
 float iBubFixedStartY = mBubFixedCenter.y + mBubFixedRadius * cosTheta;
 //C
 float iBubMovableEndX = mBubMovableCenter.x - mBubMovableRadius * sinTheta;
 float iBubMovableEndY = mBubMovableCenter.y + mBubMovableRadius * cosTheta;

 //A
 float iBubFixedEndX = mBubFixedCenter.x + mBubFixedRadius * sinTheta;
 float iBubFixedEndY = mBubFixedCenter.y - mBubFixedRadius * cosTheta;
 //B
 float iBubMovableStartX = mBubMovableCenter.x + mBubMovableRadius * sinTheta;
 float iBubMovableStartY = mBubMovableCenter.y - mBubMovableRadius * cosTheta;

 mBezierPath.reset();
 mBezierPath.moveTo(iBubFixedStartX, iBubFixedStartY);
 mBezierPath.quadTo(iAnchorX, iAnchorY, iBubMovableEndX, iBubMovableEndY);

 mBezierPath.lineTo(iBubMovableStartX, iBubMovableStartY);
 mBezierPath.quadTo(iAnchorX, iAnchorY, iBubFixedEndX, iBubFixedEndY);
 mBezierPath.close();
 canvas.drawPath(mBezierPath, mBubblePaint);
}

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// 认为是消失状态，执行爆炸动画
if (mBubbleState == BUBBLE_STATE_DISMISS && mCurDrawableIndex < mBurstBitmapsArray.length) {
 mBurstRect.set(
  (int) (mBubMovableCenter.x - mBubMovableRadius),
  (int) (mBubMovableCenter.y - mBubMovableRadius),
  (int) (mBubMovableCenter.x + mBubMovableRadius),
  (int) (mBubMovableCenter.y + mBubMovableRadius));
 canvas.drawBitmap(mBurstBitmapsArray[mCurDrawableIndex], null, mBurstRect, mBubblePaint);
}

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case MotionEvent.ACTION_DOWN:
 if (mBubbleState != BUBBLE_STATE_DISMISS) {
 mDist = (float) Math.hypot(event.getX() - mBubFixedCenter.x, event.getY() - mBubFixedCenter.y);
 if (mDist < mBubbleRadius + MOVE_OFFSET) {
  //加上MOVE_OFFSET是为了方便拖拽
  mBubbleState = BUBBLE_STATE_CONNECT;
 } else {
  mBubbleState = BUBBLE_STATE_DEFAULT;
 }
 }
 break;

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case MotionEvent.ACTION_MOVE:
 if (mBubbleState != BUBBLE_STATE_DEFAULT) {
 mDist = (float) Math.hypot(event.getX() - mBubFixedCenter.x, event.getY() - mBubFixedCenter.y);
 mBubMovableCenter.x = event.getX();
 mBubMovableCenter.y = event.getY();
 if (mBubbleState == BUBBLE_STATE_CONNECT) {
  if (mDist < mMaxDist - MOVE_OFFSET) {
  mBubFixedRadius = mBubbleRadius - mDist / 8;
  } else {
  mBubbleState = BUBBLE_STATE_APART;
  }
 }
 invalidate();
 }
 break;

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case MotionEvent.ACTION_UP:
 if (mBubbleState == BUBBLE_STATE_CONNECT) {
 // 橡皮筋动画
 startBubbleRestAnim();
 } else if (mBubbleState == BUBBLE_STATE_APART) {
 if (mDist < 2 * mBubbleRadius){
  //反弹动画
  startBubbleRestAnim();
 }else{
  // 爆炸动画
  startBubbleBurstAnim();
 }
 }
 break;

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/**
 * 连接状态下松开手指，执行类似橡皮筋动画
 */
private void startBubbleRestAnim() {
 ValueAnimator anim = ValueAnimator.ofObject(new PointFEvaluator(),
  new PointF(mBubMovableCenter.x, mBubMovableCenter.y),
  new PointF(mBubFixedCenter.x, mBubFixedCenter.y));
 anim.setDuration(200);
 anim.setInterpolator(new OvershootInterpolator(5f));
 anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
 @Override
 public void onAnimationUpdate(ValueAnimator animation) {
  mBubMovableCenter = (PointF) animation.getAnimatedValue();
  invalidate();
 }
 });
 anim.addListener(new AnimatorListenerAdapter() {
 @Override
 public void onAnimationEnd(Animator animation) {
  super.onAnimationEnd(animation);
  mBubbleState = BUBBLE_STATE_DEFAULT;
 }
 });
 anim.start();
}

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/**
 * 爆炸动画
 */
 private void startBubbleBurstAnim() {
 //将气泡改成消失状态
 mBubbleState = BUBBLE_STATE_DISMISS;
 ValueAnimator animator = ValueAnimator.ofInt(0, mBurstBitmapsArray.length);
 animator.setInterpolator(new LinearInterpolator());
 animator.setDuration(500);
 animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
  @Override
  public void onAnimationUpdate(ValueAnimator animation) {
  mCurDrawableIndex = (int) animation.getAnimatedValue();
  invalidate();
  }
 });
 animator.start();
 }