android TextView 计算文字长度

/**
     * 字符串显示到textView, textView maxLines=2
     * 如果字符串太长显示不下，则用省略号代替
     * 省略号的位置在第一行末尾
     *
     * @param textView 显示字符串的view
     * @param str  要显示的字符串
     * @param width 显示字符串的view的宽
     * @return 处理后带省略号的字符串
     */
    private String ellipsizeString(TextView textView, String str, int width) {
        Paint paint = textView.getPaint();
        //文字总宽小于2倍的view宽，说明小于2行，直接返回
        Logger.i(TAG,"w==="+paint.measureText(str));
        Logger.i(TAG,"w2==="+width);
        if (paint.measureText(str) < width) {
            return str;
        }
        Logger.i(TAG,"w==="+paint.measureText(str));
        Logger.i(TAG,"w2==="+width*2);
        if (paint.measureText(str) < 2 * width) {
            return str;
        }

        //存储显示到view的每行文字
        List<String> list = new ArrayList<>();

        int len = 0;
        int start, end = 0;

        while (len < str.length()) {
            len += end;
            int count = paint.breakText(str, end, str.length(), true, width, null);
            start = end;
            end = end + count;
            list.add(str.substring(start, end));
        }

        //第一行文字末尾三个字符替换成省略号
        String line1 = list.get(0);
//        line1 = line1.substring(0, line1.length() - 3) + "...";
        String line2 = list.get(1);
        line2 = line2.substring(0, line1.length() - 6) + "...";
        //最后一行半的文字从末尾向前截取一行文字
//        String endLine = list.get(list.size() - 1);
//        int endLineWidth = (int) paint.measureText(endLine);
//        String minorEndLine = list.get(list.size() - 2);
//        int minorCuteCount = paint.breakText(minorEndLine, 0, minorEndLine.length(), true, endLineWidth, null);
//        String line2 = minorEndLine.substring(minorCuteCount, minorEndLine.length()) + endLine;

        return line1 + line2;
    }