android圆形进度条自定义

之前在做一个一android项目的时候遇到了一个需要自定义控件的需求还时圆形的进度条，最终如下图

核心代码
主要是，extends View 然后是在构造函数里面初始化一些基本的数据，还可以读取xml配置的值，在ondraw 函数里面得到画布的中心点，计算坐标，根据API 在进行绘制

public class RoundProgressBar extends View {



  public RoundProgressBar(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);

  paint = new Paint();


  TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
          R.styleable.RoundProgressBar);

  //获取自定义属性和默认值
  roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);


  mTypedArray.recycle();

}

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

  //获取圆心的x坐标
  int centreX = getWidth() / 2;
  //获得圆心y坐标
  int centreY = getHeight() / 2;
  //圆环的半径
  int radius = (int) (centreX - roundWidth);
  paint.setStrokeWidth(roundWidth);
    paint.setColor(Color.argb(255, 213, 1, 15));  //设置进度的颜色
    RectF oval = new RectF(roundWidth, roundWidth, centreX + radius, centreY + radius);

    paint.setStrokeWidth(roundWidth);
  paint.setColor(Color.argb(255, 213, 1, 15));  //设置进度的颜色
  RectF oval = new RectF(roundWidth, roundWidth, centreX + radius, centreY + radius);
  switch (style) {
      case STROKE: {

          paint.setStyle(Paint.Style.STROKE);
          canvas.drawArc(oval, 270, 360 * progress / max, false, paint);  //根据进度画圆弧
          break;
      }
      case FILL: {
          paint.setStyle(Paint.Style.FILL_AND_STROKE);
          if (progress != 0)
              canvas.drawArc(oval, 270, 360 * progress / max, true, paint);  //根据进度画圆弧
          break;
   }
}

}

源代码，在我的github 里面都会有的

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