public class ProgressPathRainbow extends View {
 private Paint outPaint;
 private Paint innerPaint;
 private Paint mTextPaint;
 private Paint mRmbTextPaint;
 private int mBorderWidth = 40;
 private int mCircleRadius = 40;
 private int mCurrentProgress = 0;
 private int mMaxProgress = 0;
 private int startAngle = 180;

 private int sweepAngels = 180;
 private Paint mCirclePaint;
 private String rmb = "¥";
 private String currentText = "0.0";

 public void setCurrentText(String currentText) {
 this.currentText = currentText;
 }

 //儲存位置點
 private float[] pos =new float[2];

 public ProgressPathRainbow(Context context) {
 super(context);
 initPaint();
 }

 public ProgressPathRainbow(Context context, @Nullable AttributeSet attrs) {
 super(context, attrs);
 initPaint();
 }

 public ProgressPathRainbow(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
 super(context, attrs, defStyleAttr);
 initPaint();
 }

 private void initPaint(){
 outPaint = new Paint();
 outPaint.setColor(0xFFECECEC);
 outPaint.setAntiAlias(true);
 outPaint.setStyle(Paint.Style.STROKE);
 outPaint.setStrokeCap(Paint.Cap.ROUND);
 outPaint.setStrokeWidth(mBorderWidth);

 //
 innerPaint = new Paint();
 innerPaint.setColor(0xffFBA123);
 innerPaint.setAntiAlias(true);
 innerPaint.setStyle(Paint.Style.STROKE);
 innerPaint.setStrokeCap(Paint.Cap.ROUND);
 innerPaint.setStrokeWidth(mBorderWidth);

 mCirclePaint = new Paint();
 mCirclePaint.setColor(Color.WHITE);
 mCirclePaint.setStyle(Paint.Style.FILL);

 mTextPaint = new Paint();
 mTextPaint.setAntiAlias(true);
 mTextPaint.setColor(0xffE5423D);
 mTextPaint.setFakeBoldText(true);
 mTextPaint.setTextSize(SizeUtils.sp2px(42));


 mRmbTextPaint = new Paint();
 mRmbTextPaint.setAntiAlias(true);
 mRmbTextPaint.setColor(0xffE5423D);
 mRmbTextPaint.setTextSize(SizeUtils.sp2px(18));

 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 int width = MeasureSpec.getSize(widthMeasureSpec);
 int height = MeasureSpec.getSize(heightMeasureSpec);
 if (width >= height){
 setMeasuredDimension(height,height);
 }else {
 setMeasuredDimension(width,width);
 }


 }

 @Override
 protected void onDraw(Canvas canvas) {
 super.onDraw(canvas);

 RectF rectF = new RectF(mBorderWidth,mBorderWidth,getWidth()-mBorderWidth,getHeight()-mBorderWidth);
 //畫內環(huán)圓弧
 Path outerPath = new Path();
 outerPath.arcTo(rectF,startAngle,sweepAngels);
 canvas.drawPath(outerPath,outPaint);
 //畫外環(huán)圓弧
 Path innerPah = new Path();
 float percent = (float)mCurrentProgress/mMaxProgress;
 innerPah.arcTo(rectF,startAngle,percent*sweepAngels);
 canvas.drawPath(innerPah,innerPaint);


 //畫金額
 String tempText = new BigDecimal(currentText).multiply(new BigDecimal(percent)).setScale(1, RoundingMode.HALF_UP).toString();
 Rect textBounds = new Rect();
 mTextPaint.getTextBounds(tempText, 0, tempText.length(), textBounds);
 int dx = getWidth()/2 - textBounds.width()/2;
 // 基線 baseLine
 Paint.FontMetricsInt fontMetrics = mTextPaint.getFontMetricsInt();
 int dy = (fontMetrics.bottom - fontMetrics.top)/2 - fontMetrics.bottom;
 int baseLine = getHeight()/3 + dy;
 canvas.drawText(tempText,dx,baseLine,mTextPaint);

 //畫人民幣符號

 Rect textBoundRmbs = new Rect();
 mTextPaint.getTextBounds(rmb, 0, rmb.length(), textBoundRmbs);
 int dxRmb = dx-50;
 // 基線 baseLine
 Paint.FontMetricsInt fontMetricsRmb = mTextPaint.getFontMetricsInt();
 int dyRmb = (fontMetricsRmb.bottom - fontMetricsRmb.top)/2 - fontMetricsRmb.bottom;
 int baseLineRmb = getHeight()/3 + dyRmb;
 canvas.drawText(rmb,dxRmb,baseLineRmb,mRmbTextPaint);

 //獲取圓弧上點的位置(坐標,畫一個圓)
 PathMeasure pathMeasure = new PathMeasure(outerPath,false);
 boolean posTan = pathMeasure.getPosTan(pathMeasure.getLength() * percent, pos, null);
 canvas.drawCircle(pos[0],pos[1],mCircleRadius,mCirclePaint);

 }

 public synchronized void setmCurrentProgress(int mCurrentProgress) {
 this.mCurrentProgress = mCurrentProgress;
 invalidate();
 }

 public synchronized void setmMaxProgress(int mMaxProgress) {
 this.mMaxProgress = mMaxProgress;
 }
}

detailRainbowPr.setmMaxProgress(100);
detailRainbowPr.setCurrentText("99.9");
ValueAnimator valueAnimator = ObjectAnimator.ofFloat(0, 100);
 valueAnimator.setDuration(5000);
 valueAnimator.setInterpolator(new DecelerateInterpolator());
 valueAnimator.addUpdateListener(valueAnimator1 -> {
 float step = (float) valueAnimator1.getAnimatedValue();
 detailRainbowPr.setmCurrentProgress((int) step);
 });
 valueAnimator.start();