app读写系统某节点值例如/sys/devices/platform/mode-3d/state

读写节点,注意节点权限
private String readFile(String path) {
    String prop = "";
    try {
        BufferedReader reader = new BufferedReader(new FileReader(path));
        prop = reader.readLine();
        Log.i("ShellUtils", "获取值："+prop);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return prop;
}
private void writeFile(String value) {
    File modefile = new File("/sys/devices/platform/mode-3d/state");
    if (modefile.exists()) {
        try {
            RandomAccessFile file = new RandomAccessFile("/sys/devices/platform/mode-3d/state", "rw");
            file.write(Integer.parseInt(value));
            file.close();
            Log.d("ShellUtils", "setString = "+value);
        } catch (IOException re) {
            Log.e("ShellUtils", "setString: "+re.toString());
        } catch (NumberFormatException re) {
            Log.e("ShellUtils", "setString: "+re.toString());
        }
    }
}