Android笔记 自定义控件时drawText字符串宽度的3种计算方式

String str = "hello";
canvas.drawText(str, x, y, mPaint);//1. 粗略计算文字宽度：
float width = mPaint.measureText(str);//2. 计算文字的矩形，可以得到宽高：
Rect rect = new Rect();
mPaint.getTextBounds(str, 0, str.length(), rect);
int w = rect.width();
int h = rect.height();//3. 精确计算文字的宽度：
public static int  getTextWidth(Paint mPaint, String str)
{float iSum = 0;if(str != null && !str.equals("")){int len = str.length();float  widths[] = new float[len];paint.getTextWidths(str, widths);for(int i = 0; i < len; i++){iSum += Math.ceil(widths[i])}}return (int)iSum;
}