Android logout if application goes in background for 15 minutes

Question

I need to logout from my application if it goes into background and is resumed after more than 15 minutes.

Please refer to the code after implementing the solution provided

public class BaseActivity extends Activity {
    BaseActivity context;
    private AlarmManager alarmMgr;
    private PendingIntent alarmIntent;

    BaseActivity() {
        context = this;
    }

    @Override
    protected void onStart() {
        super.onStart();
        if (alarmMgr != null) {
            alarmMgr.cancel(alarmIntent);
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        alarmMgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(BaseActivity.this, SampleBootReceiver.class);
        alarmIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

        alarmMgr.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + 1 * 30 * 1000, alarmIntent); // 15

    }

    class SampleBootReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(context, "alarm", Toast.LENGTH_SHORT).show();
            Intent intent_login = new Intent(context, SignIn.class);
            intent_login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent_login);
            overridePendingTransition(R.anim.in_from_left, R.anim.out_to_right);
        }
    }
}

Answer 1

You could store the time (System.currentTimeMillis) in the onPause() methode of your activity (for example using SharedPreferences). In the onResume-Methode, you could check this time and log the user of if 1000*60*15 millis are over.

Answer 2

You can use AlarmManager to schedule an alarm in 15 minutes from now, and then when the alarm is launched you can logout from your app. Then when you open again your app you have to sure that your cancel the current alarm thus you can assure that the logout will not be executed if the user open the app in a period of 15 minutes. You can find a full example here The good point about this aproach is that your application must not be running.

Summarizing, for the copy&paste lovers:

To schedule an alarm:

private AlarmManager alarmMgr;
private PendingIntent alarmIntent;
...
alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, AlarmReceiver.class);
alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0);

alarmMgr.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
    SystemClock.elapsedRealtime() +
    15 * 60 * 1000, alarmIntent); // 15 minutes

Your BroadcastReceiver that will logout from your system:

public class SampleBootReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // LOGOUT
    }
}

To cancel an exiting alarm:

if (alarmMgr!= null) {
    alarmMgr.cancel(alarmIntent);
}

Answer 3

Try following code

//Class level variable 
private boolean inBackground = false;

@Override
public void onResume()
{
     inBackground = false;
}


@Override 
public void onPause()
{
    inBackground = true;
    new CountDownTimer( 900000 , 1000 ) 
    {
         public void onTick(long millisUntilFinished) {}

         public void onFinish() 
         {
             if ( inBackground )
             {
                  // code to logout
             }
         }
    }.start();
}

Whenever your application goes into background be default control will be in onPause() method. Here I have use a CountDownTimer which will perform logout operation after 15 minute's interval.

Answer 4

Try to learn more about the activity lifecycle which is availalbe at http://developer.android.com/training/basics/activity-lifecycle/index.html . Your app is going to background which means your current activity is going into the onpause() state or onStop(). You need to do the coding in these activity cycles. In this state you can call the alarm Manager which can perform a specific task at a given Time like in your case start the app after 15 minutes