Android View drawText 文本居中

publicvoid drawText (CharSequencetext, int start, int end, float x, float y, Paint paint)

Draw the specified range of text,specified by start/end, with its origin at (x,y), in the specified Paint. Theorigin is interpreted based on the Align setting in the Paint.

Parameters

text	The text to be drawn
start	The index of the first character in text to draw
end	(end - 1) is the index of the last character in text to draw
x	The x-coordinate of origin for where to draw the text
y	The y-coordinate of origin for where to draw the text
paint	The paint used for the text (e.g. color, size, style)

 

上面这个是Android的画文本的方法，要想让文本居中主要是x,y这两个参数。重载的方法相同。

 

x	The x-coordinate of origin for where to draw the text
	文本的起始点X坐标
y	The y-coordinate of the baseline of the text being drawn
	文本的baseline坐标

X位置居中很简单，文本所在控件宽度的一半减去文字的宽度的一半

Y位置居中必须让BaseLine的位置下潜，因为BaseLine的位置并不是文字的中心位置

具体代码如下：

Paint.FontMetricsfontMetrics = mCountPaint.getFontMetrics();

float bottom =fontMetrics.bottom;

float top =fontMetrics.top;

int y= (int) (measuredHeight/2-bottom+(bottom-top)/2);

canvas.drawText(mCountString,0, mCountString.length(), measuredWidth / 2-v/2, y, mCountPaint);