自定义CircularProgressBar

public class CircularProgressBar extends View {      private int mDuration = 100;   private int mProgress = 30;      private Paint mPaint = new Paint();   private RectF mRectF = new RectF();      private int mBackgroundColor = Color.LTGRAY;   private int mPrimaryColor = Color.parseColor("#6DCAEC");   private float mStrokeWidth = 2F;      /**    * 进度条改变监听    *     * {@link #onChange( int duration, int progress, float rate)}    */   public interface OnProgressChangeListener {      /**       * 进度改变事件，当进度条进度改变，就会调用该方法       * @param duration 总进度       * @param progress 当前进度       * @param rate 当前进度与总进度的商 即：rate = (float)progress / duration       */      public void onChange(int duration, int progress, float rate);   }      private OnProgressChangeListener mOnChangeListener;      /**    * 设置进度条改变监听    * @param l    */   public void setOnProgressChangeListener(OnProgressChangeListener l) {      mOnChangeListener = l;   }      public CircularProgressBar(Context context) {      super(context);   }      public CircularProgressBar(Context context, AttributeSet attrs) {      super(context, attrs);   }      /**    * 设置进度条的最大值, 该值要 大于 0    * @param max    */   public void setMax( int max ) {      if( max < 0 ) {         max = 0;      }      mDuration = max;   }      /**    * 得到进度条的最大值    * @return    */   public int getMax() {      return mDuration;   }      /**    * 设置进度条的当前的值    * @param progress     */   public void setProgress( int progress ) {      if( progress > mDuration ) {         progress = mDuration;      }      mProgress = progress;      if( mOnChangeListener != null ) {         mOnChangeListener.onChange(mDuration, progress, getRateOfProgress());      }      invalidate();   }      /**    * 得到进度条当前的值    * @return    */   public int getProgress() {      return mProgress;   }      /**    * 设置进度条背景的颜色    */   public void setBackgroundColor( int color ) {      mBackgroundColor = color;   }      /**    * 设置进度条进度的颜色    */   public void setPrimaryColor( int color ) {      mPrimaryColor = color;   }      /**    * 设置环形的宽度    * @param width    */   public void setCircleWidth(float width) {      mStrokeWidth = width;         }   @Override   protected synchronized void onDraw(Canvas canvas) {      super.onDraw(canvas);            int halfWidth = getWidth() / 2;      int halfHeight = getHeight() /2;      int radius = halfWidth < halfHeight ? halfWidth : halfHeight;      float halfStrokeWidth = mStrokeWidth / 2;            // 设置画笔      mPaint.setColor(mBackgroundColor);      mPaint.setDither(true);      mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);      mPaint.setAntiAlias(true);      mPaint.setStrokeWidth(mStrokeWidth);      mPaint.setStyle(Paint.Style.STROKE);   //设置图形为空心            // 画背景      canvas.drawCircle(halfWidth, halfHeight, radius - halfStrokeWidth, mPaint);            // 画当前进度的圆环      mPaint.setColor(mPrimaryColor);    // 改变画笔颜色      mRectF.top = halfHeight - radius + halfStrokeWidth;      mRectF.bottom = halfHeight + radius - halfStrokeWidth;      mRectF.left = halfWidth - radius + halfStrokeWidth;      mRectF.right = halfWidth + radius - halfStrokeWidth;      canvas.drawArc(mRectF, -90, getRateOfProgress() * 360, false, mPaint);      canvas.save();   }      /**    * 得到当前的进度的比率    * <p> 用进度条当前的值 与 进度条的最大值求商 </p>    * @return    */   private float getRateOfProgress() {      return (float)mProgress / mDuration;   }   
}