onMeasure问题

[inkuxuan]

mArcPaint的setStrokeWidth宽度是一半外缘一半内缘的，因此measure时应该是
width = (int) (mRadius * 2 + mBoardWidth);
height = (int) (mRadius * 2 + mBoardWidth);

[inkuxuan]

同理 onSizeChanged
mArcRectf = new RectF(mBoardWidth / 2f,
mBoardWidth / 2f,
mRadius * 2 + mBoardWidth / 2f,
mRadius * 2 + mBoardWidth / 2f);