android 获取字体宽高

String str = "Hello";  
canvas.drawText( str , x , y , paint);  
  
//1. 粗略计算文字宽度  
Log.d(TAG, "measureText=" + paint.measureText(str));  
  
//2. 计算文字所在矩形，可以得到宽高  
Rect rect = new Rect();  
paint.getTextBounds(str, 0, str.length(), rect);  
int w = rect.width();  
int h = rect.height();  
Log.d(TAG, "w=" +w+"  h="+h);  
  
//3. 精确计算文字宽度  
int textWidth = getTextWidth(paint, str);  
Log.d(TAG, "textWidth=" + textWidth);  
  
    public static int getTextWidth(Paint paint, String str) {  
        int iRet = 0;  
        if (str != null && str.length() > 0) {  
            int len = str.length();  
            float[] widths = new float[len];  
            paint.getTextWidths(str, widths);  
            for (int j = 0; j < len; j++) {  
                iRet += (int) Math.ceil(widths[j]);  
            }  
        }  
        return iRet;  
    }  

转载自：http://blog.csdn.net/chuekup/article/details/7518239