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Performance evaluation and optimization android - Memory
Original: https: //myml666.github.io ( source code download see the end of the article )
This is to achieve a vibrato imitation of the music rotation Custom View, look at the effect
To achieve this effect is mainly a patchwork approach adopted, which is to achieve the notes animated picture again achieve rotation animation effect and then merge the two together.
Look under the concept map
Notes animation
Animation note here is the use of Bezier curve + PathMeasure + ValueAnimator achieved
1. Draw Bezier curve: trajectory because the note is bottom-up, so we need to add Path path when first starting point to the bottom right, and then draw a Bezier curve.
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);
//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);
2.PathMeasure + ValueAnimator achieve the notes along the trajectory
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);}
//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();
}
@Override
protected 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);
}
Picture rotation
Here I quote a third round Gallery
implementation 'de.hdodenhof:circleimageview:2.2.0''de.hdodenhof:circleimageview:2.2.0'
Achieve image rotation
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);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);
Finally, attach Source: https: //gitee.com/itfittnesss/DouYinMusic, more android learning and video Welcome to our knowledge of the planet, there are 1000+ junior partner, so you learn not lonely ~ *
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