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//定义rectf矩形的内切圆
RectF rectf = new RectF(50,50,180,180);
canvas.drawArc(rectf, 0, 329, true, mPaint);
//定义rectf矩形的内切圆, boolean userCenter, 是否
RectF rectf1 = new RectF(200,200,300,300);
canvas.drawArc(rectf1, 0, 329, false, mPaint);
注意mPaint.setStyle(Paint.Style.STROKE);
Paint的画笔有两种Style: FILL ,STROKE
FILL :填充, 如矩形, 中间有颜色填充
STROKE: 轮廓 只是画出图形的轮廓。
android canvas paint 的属性, 及画图形
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原文地址:http://www.cnblogs.com/chengbao/p/5656581.html