其實這個控制項很簡單，繼承view，在ondraw 中 繪製乙個圓和乙個圓弧即可，**如下，對外暴露了乙個設定進度的方法，難點主要是數學計算
public class circleview extends view
private void initvalues()
private void init()
@override
protected void ondraw(canvas canvas)
canvas.drawcircle(mrockbollposition.x, mrockbollposition.y, mradius , mpaint); }
@override
protected void onmeasure(int widthmeasurespec, int heightmeasurespec)
private int getscreenwidth()
@override
public boolean ontouchevent(motionevent event)
break;
case motionevent.action_move:
if(isdraging)
break;
case motionevent.action_up:
isdraging = false;
mradius = 8;
break;
default:
break;
} invalidate();
return true;
} private point getonradius(point cp)
private void flushradian(point cp, point pp) else
}elseelse
} progresslistener.setprogresschanged((float)playedradian/360f);
// system.out.println("atan:"+(atan/math.pi)*180);
} private int distance(point cp, point np) catch (exception e)
return 0; }
/*** @describe 觸控點與中心點之間直線與水平方向的夾角角
* @param a
* @param b
* @return
*/public static float getradian(point a, point b)
/*** 根據進度條角度重新整理小球的位置
* * @param playedradian2
*/private void flushrockposition(int ang)
public void setprogress(float progress)
private progresschangedlistener progresslistener;
public void setprogresslistener(progresschangedlistener progresslistener)
public inte***ce progresschangedlistener
}
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