<Android> Canvas绘制

文本水平+垂直居中

drawText(txt, x, y, paint)
其中y代表的是baseline, exactCenterY代表的是绝对的中间Y。

private Rect mTextBound = new Rect();
mPaint.setTextAlign(Paint.Align.CENTER);
mPaint.getTextBounds(mText, 0, mText.length(), mTextBound);

canvas.drawText(mText, centerX, centerY - mTextBound.exactCenterY() , mPaint);