Android drawText擷取text寬度的三種方式

String str = "Hello";canvas.drawText( str , x , y , paint);//1. 粗略計算文字寬度Log.d(TAG, "measureText=" + paint.measureText(str));//2. 計算文字所在矩形，可以得到寬高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. 精確計算文字寬度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;    }