Android App Exit on Back Button

Question

I m trying to exit my application on touching the back button. I ve used the usual code, but it only takes out the app from the screen and when i Click on the square box on the bottom right (also tell me whats it called) i can still see the app running the background i want to remove it totally from the system. i ve tried all of them finish(); and System.exit(0); they just pass the app to the background from the fore ground. I want to remove it completely from the system.

The following the code i am using.

@Override
public void onBackPressed() {

        new AlertDialog.Builder(this).setIcon(android.R.drawable.ic_dialog_alert).setTitle("Exit")
                .setMessage("Are you sure?")
                .setPositiveButton("yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        Intent intent = new Intent(Intent.ACTION_MAIN);
                        intent.addCategory(Intent.CATEGORY_HOME);
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(intent);
                        finish();
                        System.exit(0);
                    }
                }).setNegativeButton("no", null).show();

    }

take a look at the similar question http://stackoverflow.com/questions/6330200/how-to-quit-android-application-programmatically — Volodymyr, Oct 04 '16 at 18:38
these are giving the same answers as finish(); or System.exit(0); its not working it just takes my app in the background. Than i ve to manually remove it from the background apps by swiping it right. — Karan Jtv, Oct 04 '16 at 18:47
Ya i ve tried all of them finish(); and System.exit(0); they just pass the app to the background from the fore ground. I want to remove it compeletly from the system. @VolodymyrKhodonovych — Karan Jtv, Oct 04 '16 at 18:49

Cătălin Florescu · Accepted Answer · 2016-10-04T21:26:03.923

4

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); will clear previous activities. Using this, finish() call won't be necessary.

And System.exit(0); is used in java, not android, so don't use this anymore. Use finish() or getActivity().finish() in fragment to close current activity.

Update:

If you want to kill the app in order to not run any more in background, you need to do something like this

ActivityManager am = (ActivityManager) getSystemService(Activity.ACTIVITY_SERVICE); am.killBackgroundProcesses(packageName);

Where packagename is your app package. And you need to provide permission <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />. I think this need to be requested on M. Have a try.

edited Oct 04 '16 at 21:26

answered Oct 04 '16 at 19:08

Cătălin Florescu

5,012
1
25
36

its not working just taking it from foreground to background. – Karan Jtv Oct 04 '16 at 21:08
Please remove your other flags. – Cătălin Florescu Oct 04 '16 at 21:09
Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_HOME); //intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); finish(); – Karan Jtv Oct 04 '16 at 21:17
i tried with every other app no app ever totally shuts down unless you just swipe it to right manually. i think there is no total exit fuctionality.. – Karan Jtv Oct 04 '16 at 21:21
Anyway.. this is not a good idea what are you trying to do. With pleasure. – Cătălin Florescu Oct 05 '16 at 11:52

score 2 · Answer 2 · answered Oct 04 '16 at 18:54

2

if you wanna exit the app from main activity , you can just write :

finish();

or for exit the app from other activity , you should do like this in other activity :

    //in other activity onBackPressed()     
    Intent intent = new Intent(OtherActivity.this, MainActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    intent.putExtra("EXIT", true);
    startActivity(intent);

and write this in onCreate() for MainActivity

 if (getIntent().getBooleanExtra("EXIT", false)) {
        finish();
        System.exit(0);
    }

that's work for me and I'll hope it work for you too.

answered Oct 04 '16 at 18:54

Nickan

466
5
17

Don't use `System.exit(0)`. Just `finish()`. This is Android, not java. – Cătălin Florescu Oct 04 '16 at 19:05
finish() - finishes the activity where it is called from and you see the previous activity. System.exit(0) - restarts the app with one fewer activity on the stack. So, if you called ActivityB from ActivityA, and System.exit(0) is called in ActivityB, then the application will be killed and started immediately with only one activity ActivityA – Cătălin Florescu Oct 04 '16 at 21:08
its not working just taking it from foreground to background. – Karan Jtv Oct 04 '16 at 21:09
thats what exactly is happening everytime..! – Karan Jtv Oct 04 '16 at 21:10

Android App Exit on Back Button

2 Answers2