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这篇文章主要讲解了Android自定义圆弧进度条加数字动态变化的方法，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。

效果如下:

思路:一个内环圆弧和一个外环圆弧,因为有一个圆圈是在圆弧上做圆周运动,所以在画圆的时候必须要得到圆弧上的各个点的坐标,这里其实就用到了PathMeasure这个类,可以帮我们拿到这些点,在画圆弧的时候也理所应当的要使用path,然后根据外界动态的传值进行重绘就能达到动态的效果

代码如下:

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;
  }

  //储存位置点
  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);
    //画内环圆弧
    Path outerPath = new Path();
    outerPath.arcTo(rectF,startAngle,sweepAngels);
    canvas.drawPath(outerPath,outPaint);
    //画外环圆弧
    Path innerPah = new Path();
    float percent = (float)mCurrentProgress/mMaxProgress;
    innerPah.arcTo(rectF,startAngle,percent*sweepAngels);
    canvas.drawPath(innerPah,innerPaint);


    //画金额
    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;
    // 基线 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);

    //画人民币符号

    Rect textBoundRmbs = new Rect();
    mTextPaint.getTextBounds(rmb, 0, rmb.length(), textBoundRmbs);
    int dxRmb = dx-50;
    // 基线 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);

    //获取圆弧上点的位置(坐标,画一个圆)
    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;
  }
}

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