Android动态绘制饼状图的示例代码

   paint = new Paint();
   paint.setAntiAlias(true);
   paint.setStyle(Paint.Style.FILL_AND_STROKE);

   screenW = DensityUtils.getScreenWidth(context);

   int width = DensityUtils.dip2px(context, 15);//圆环宽度
   int widthXY = DensityUtils.dip2px(context, 10);//微调距离

   int pieCenterX = screenW / 2;//饼状图中心X
   int pieCenterY = screenW / 3;//饼状图中心Y
   int pieRadius = screenW / 4;// 大圆半径

   //整个饼状图rect
   pieOval = new RectF();
   pieOval.left = pieCenterX - pieRadius;
   pieOval.top = pieCenterY - pieRadius + widthXY;
   pieOval.right = pieCenterX + pieRadius;
   pieOval.bottom = pieCenterY + pieRadius + widthXY;

   //里面的空白rect
   pieOvalIn = new RectF();
   pieOvalIn.left = pieOval.left + width;
   pieOvalIn.top = pieOval.top + width;
   pieOvalIn.right = pieOval.right - width;
   pieOvalIn.bottom = pieOval.bottom - width;

   //里面的空白画笔
   piePaintIn = new Paint();
   piePaintIn.setAntiAlias(true);
   piePaintIn.setStyle(Paint.Style.FILL);
   piePaintIn.setColor(Color.parseColor("#f4f4f4"));

  private void settleCakeValues(int i) {
    float sum = getSum(cakeValues, i);
    CakeValue value = cakeValues.get(i);
    if (sum <= 100f) {
      value.setItemValue(100f - sum);
      cakeValues.set(i, value);
    } else {
      value.setItemValue(0);
      settleCakeValues(i - 1);
    }
  }

cakeValueAnimator.addUpdateListener(new AnimatorUpdateListener() {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        float mAngle = obj2Float(animation.getAnimatedValue("angle"));
        curAngle = mAngle;
        drawArc();
      }
    });

private int getCurItem(float curAngle) {
    int res = 0;
    for (int i = 0; i 

 paint.setColor(Color.parseColor(cakeValues.get(colorIndex).getColors()));
 float curStartAngle = 0;
 float curSweepAngle = curAngle;
 if (curItem > 0) {
   curStartAngle = itemFrame[curItem - 1] * ANGLE_NUM;
   curSweepAngle = curAngle - (itemFrame[curItem - 1] * ANGLE_NUM);
  }
  canvas.drawArc(pieOval, curStartAngle, curSweepAngle, true, paint);

for (int i = 0; i 

canvas.drawArc(pieOvalIn, 0, 360, true, piePaintIn);

 @Override
  protected void onDraw(Canvas canvas) {
    if (isFirst && isDrawByAnim) {
      drawCakeByAnim();
    }
    isFirst = false;
  }

public void surfaceCreated(SurfaceHolder holder) {
  if (!isFirst||!isDrawByAnim)
     drawCake();
}

    //是否动画
    //是否立体
    //动画时间
    //默认颜色

    //圆环宽度
    //立体宽度
    //微调宽度