在android App中怎样实现对设备重启或者关机功能

重启：//发送广播

    Intent reboot = new Intent(Intent.ACTION_REBOOT);

    reboot.putExtra("nowait",1);

    reboot.putExtra("interval",1);

    reboot.putExtra("window",0);

    sendBroadcast(reboot);

   

    关机：//启动 Activity

    Intent shutdown = new Intent(Intent.ACTION_REQUEST_SHUTDOWN);

    shutdown.putExtra(Intent.EXTRA_KEY_CONFIRM,showShutdownDialog);

    shotdown.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);

    startActivity(shutdown);