Android仿抖音音乐旋转效果

path = new Path();//将起点移到右下角path.moveTo(getWidth(),getHeight()-getWidth()/6);//绘制自下而上的贝塞尔曲线path.quadTo(0,getHeight(),getWidth()/4,0);

private void initPath() {    //新建两个float数组pos用来存储每个轨迹点的坐标，tan用来存储正切值    pos = new float[2];    tan = new float[2];    path = new Path();    path.moveTo(getWidth(),getHeight()-getWidth()/6);    path.quadTo(0,getHeight(),getWidth()/4,0);    pathMeasure = new PathMeasure(path,false);    length = pathMeasure.getLength();    valueAnimator = ValueAnimator.ofFloat(0,2f);    valueAnimator.setDuration(3000);    //设置重复执行动画    valueAnimator.setRepeatCount(ValueAnimator.INFINITE);    //设置为匀速运动    valueAnimator.setInterpolator(new LinearInterpolator());    valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {        @Override        public void onAnimationUpdate(ValueAnimator animation) {            float temp=(float) animation.getAnimatedValue();            val= temp/2;            //这里实现音符的透明度从0~1~0的效果            if(temp>1){                Music3.this.setAlpha(Math.abs(temp-2f));            }else {                Music3.this.setAlpha(temp);            }            //更新界面            invalidate();        }    });    valueAnimator.start();}@Overrideprotected void onDraw(Canvas canvas) {    super.onDraw(canvas);    //获取每个点对应的坐标    pathMeasure.getPosTan(length*val,pos,tan);    //创建音符BitMap宽高是逐渐放大的    scaledBitmap = Bitmap.createScaledBitmap(bitmap, (int)(getWidth()/5*val)+4, (int)(getWidth()/5*val)+4, true);    canvas.drawPath(path,paint);    canvas.drawBitmap(scaledBitmap,pos[0],pos[1],paint);}

implementation 'de.hdodenhof:circleimageview:2.2.0'

circleImageView = findViewById(R.id.mm);RotateAnimation rotateAnimation = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);rotateAnimation.setInterpolator(new LinearInterpolator());rotateAnimation.setDuration(4000);rotateAnimation.setRepeatCount(Animation.INFINITE);circleImageView.startAnimation(rotateAnimation);