Android drawText获取text宽度的三种方式

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

 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;
     }