android 转小写

//大小写转换public static String convertString(String src){    char[] array = src.toCharArray();    int temp = 0;    for (int i = 0; i < array.length; i++)    {        temp = (int) array[i];        if (temp <= 90 && temp >= 65)        { // array[i]为大写字母            array[i] = (char) (temp + 32);        } else if (temp <= 122 && temp >= 97) { // array[i]为小写字母            array[i] = (char) (temp - 32);        }    }    return String.valueOf(array);}