在手机内存储器中读取字符文件

        File filesDir = getFilesDir();
        File file = new File(filesDir, "test.txt");
        FileReader fr = new FileReader(file);
        int len = 0;
        char[] buff = new char[20];
        StringBuffer sb = new StringBuffer();
        while ((len = fr.read(buff)) != -1) {
            sb.append(new String(buff, 0, len));
        }
        System.out.println(sb.toString());