i want to Reboot my phone i tried
        try {
    Process proc = Runtime.getRuntime().exec(new String[] { "su", "-c", "reboot" });
    proc.waitFor();
} catch (Exception ex) {
    Log.i(TAG, "Could not reboot", ex);
}
and also PowerManager see my coding but device is not rebooting in both the coding kindly give working code
          ok = (Button)findViewById(R.id.button1);
    final PowerManager power = (PowerManager)getSystemService(Context.POWER_SERVICE);
    ok.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            power.reboot("fav");
        }
    });