private static final String DEFAULT_COLOR = "#00ba9b";
private static final int DEFAULT_SIZE = 50;  //默認(rèn)大小
private static final int DRAW_CIRCLE = 10001; //狀態(tài)標(biāo)記 畫出圓形和三角形 執(zhí)行畫出圓形的動(dòng)畫
private static final int ROTATE_TRIANGLE = 10002; //狀態(tài)標(biāo)記 執(zhí)行旋轉(zhuǎn)三角形和收回圓形的動(dòng)畫
private Context mContext;
private Paint trianglePaint;  //三角形的畫筆
private Paint circlePaint;  //圓形畫筆
private float paintStrokeWidth = 1; // 設(shè)置圓形的寬度
private long duration = 800; //執(zhí)行時(shí)間
private int mWidth; //View的寬高
private int mHeight;
private Path trianglePath; //三角形的路徑
private Path circlePath;  //圓形的路徑
private Path dst; //由pathMeasure計(jì)算后的path
private Point p1, p2, p3; //三角形的三個(gè)點(diǎn)
private ValueAnimator animator; //屬性動(dòng)畫 主要是獲取0-1的值來執(zhí)行動(dòng)畫
private float mAnimatorValue = 0;  //存放獲取到的0-1的值
private int mCurrentState = 0;  //當(dāng)前的狀態(tài) 
private int radius = 0; //圓的半徑
private float startSegment; //圓開始畫的長(zhǎng)度
private PathMeasure mMeasure; //測(cè)量path
private int triangleColor = -1;
private int circleColor = -1;

trianglePath = new Path();
p1 = new Point();
p2 = new Point();
p3 = new Point();
trianglePath.moveTo(p1.x, p1.y);
trianglePath.lineTo(p2.x, p2.y);
trianglePath.lineTo(p3.x, p3.y);
trianglePath.close();

circlePath = new Path();
RectF circleRect = new RectF(-radius, -radius, radius, radius);
circlePath.addArc(circleRect, 268, 358); // 這個(gè)是從圓的268°開始畫，畫258°空出兩度的一個(gè)缺口

private void initAnimation() {
    TimeInterpolator timeInterpolator = new AccelerateDecelerateInterpolator();
    animator = ValueAnimator.ofFloat(0, 1).setDuration(duration);
    animator.setInterpolator(timeInterpolator);
    animator.setRepeatMode(ValueAnimator.RESTART);
    animator.setRepeatCount(ValueAnimator.INFINITE);
    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        mAnimatorValue = (float) animation.getAnimatedValue(); //這里我們將會(huì)拿到一個(gè)0-1的值
        invalidate(); // 這里進(jìn)行重繪
      }
    });
    animator.addListener(new Animator.AnimatorListener() {
      @Override
      public void onAnimationStart(Animator animation) {
      }

      @Override
      public void onAnimationEnd(Animator animation) {

      }

      @Override
      public void onAnimationCancel(Animator animation) {
      }

      @Override
      public void onAnimationRepeat(Animator animation) { 
       //這里進(jìn)行狀態(tài)轉(zhuǎn)換,執(zhí)行不同的動(dòng)畫
        switch (mCurrentState) {
          case DRAW_CIRCLE:
            mCurrentState = ROTATE_TRIANGLE;
            break;
          case ROTATE_TRIANGLE:
            mCurrentState = DRAW_CIRCLE;
            break;
          default:
            break;
        }
      }
    });
  }

protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    //將原點(diǎn)移動(dòng)到中心位置
    canvas.translate(mWidth / 2, mHeight / 2);
    // 重置path dst
    dst.reset();
    //判斷當(dāng)前的狀態(tài)
    switch (mCurrentState) {
     //這里就是我們說的第一種狀態(tài)
      case DRAW_CIRCLE:
      //這一行是獲取需要截取的path(dst)的開始位置，我們仔細(xì)觀察動(dòng)畫可以看出，圓的開始是由一個(gè)位置向
      //兩端去畫的，這個(gè)位置大約是圓的1/5，當(dāng)畫到了圓的起點(diǎn)的時(shí)候就從圓的起點(diǎn)開始繪制，我把執(zhí)行這個(gè)動(dòng)畫
      //的時(shí)間大致的設(shè)置為0-1 的0.3的位置左右。
        startSegment = (float) (mMeasure.getLength() / 5 * ((0.3 - mAnimatorValue) > 0 ? (0.3 - mAnimatorValue) : 0));
        //這里沒什么就是繪制三角形
        trianglePaint.setStyle(Paint.Style.FILL_AND_STROKE);
        canvas.drawPath(trianglePath, trianglePaint);
        //這個(gè)方法就是獲取你要截取的片段，第一個(gè)參數(shù)是開始的位置，第二個(gè)參數(shù)是結(jié)束的位置，第三個(gè)參
        //數(shù)是截取后的path，添加到path（dst），注意是添加不是替換所以前面要reset，第四個(gè)參數(shù)是，是
        //否要移動(dòng)起點(diǎn)到當(dāng)前路徑的起點(diǎn)保持dst中的路徑不變（舉個(gè)例子，如果dst中之前是有path的，這里
        //設(shè)置了false，此時(shí)就會(huì)保證dst的連續(xù)性而移動(dòng)dst后加入的路徑的起點(diǎn)到上一個(gè)路徑的終點(diǎn)，從而保持連續(xù)性）
        mMeasure.getSegment(startSegment, mMeasure.getLength() * mAnimatorValue, dst, true);
        canvas.drawPath(dst, circlePaint);
        break;
         //第二種動(dòng)畫
      case ROTATE_TRIANGLE:
      //對(duì)畫布進(jìn)行保存，因?yàn)橐獔?zhí)行兩個(gè)動(dòng)畫，保存初始狀態(tài)下的畫布
        canvas.save();
        //然后先執(zhí)行三角形的旋轉(zhuǎn)
        trianglePaint.setStyle(Paint.Style.FILL_AND_STROKE);
        canvas.rotate(360 * mAnimatorValue);
        canvas.drawPath(trianglePath, trianglePaint);
        //恢復(fù)畫布
        canvas.restore();
        //然后是外面圓的消失，消失其實(shí)和畫圓的道理是一樣的，這里我們有一組0-1的變化的值，我們只需要
        //截取片段的時(shí)候讓起點(diǎn)不斷的向總長(zhǎng)度靠近，就會(huì)出現(xiàn)消失的效果
        mMeasure.getSegment(mMeasure.getLength() * mAnimatorValue, mMeasure.getLength(), dst, true);
        canvas.drawPath(dst, circlePaint);
        break;
      default:
        break;
    }

  }