用paint 计算字符串的像素宽度

1.只得到字符宽度

//直接返回参数字符串所占用的像素宽度

 Paint paint = new Paint();
 width = paint.measureText(str);

有一些view可以直接得到paint,如textview,

     TextPaint paint = noticeView.getPaint();
     String text = ""+noticeView.getText();
     int w = (int) paint.measureText(text); 

2.得到字符矩形区域大小

 Paint paint = new Paint();
 Rect rect = new Rect();

 //返回包围整个字符串的最小的一个Rect区域
 paint.getTextBounds(str, , , rect); 

 strwid = rect.width();
 strhei = rect.height();