How to close our application in back button in android

Question

I want to close my whole application when click on device's back button. How can I do this? Please help me.

thank you

Why do you want to close the whole application? That's something which doesn't belong to the android lifecycle. Please reconsider your design because it smells very wrong: http://developer.android.com/reference/android/app/Activity.html — schlingel, Dec 19 '11 at 12:48
possible duplicate of [Quitting an application - is that frowned upon?](http://stackoverflow.com/questions/2033914/quitting-an-application-is-that-frowned-upon) — CommonsWare, Dec 19 '11 at 16:34

score 2 · Answer 1 · edited Dec 19 '11 at 13:59

That's one of most useless desires of beginner Android developers, and unfortunately it seems to be very popular. How do you define "close" an Android application? Hide its user interface? Interrupt background work? Stop handling broadcasts?

Android applications are a set of modules, bundled in an .apk and exposed to the system through AndroidManifest.xml. Activities can be arranged and re-arranged through different task stacks, and finish()-ing or any other navigating away from a single Activity may mean totally different things in different situations. Single application can run inside multiple processes, so killing one process doesn't necessary mean there will be no application code left running. And finally, BroadcastReceivers can be called by the system any time, recreating the needed processes if they are not running.

The main thing is that you don't need to stop/kill/close/whatever your app trough a single line of code. Doing so is an indication you missed some important point in Android development. If for some bizarre reason you have to do it, you need to finish() all Activities, stop all Services and disable all BroadcastReceivers declared in AndroidManifest.xml. That's not a single line of code, and maybe launching the Activity that uninstalls your own application will do the job better.

finish() closes single activity only, not entire application. System.exit(0) is ok but not good. — Yugandhar Babu, Dec 19 '11 at 13:17
@YugandharBabu no, calling System.exit is *not* ok. It does not go along with Android's activity lifecycle — skynet, Jul 27 '12 at 19:57
Application opens, detects there is no login to the web service and launches a new activity asking for login credentials. User hits back. Application detects there is no credentials and immediately re-launches the activity asking for login credentials. So, perhaps the login credentials dialog needs a way to NOT let the app go back to the main screen to finish running. So there are use cases where it's needed. One workaround is to use a shared preference that stores the fact you want to close the app, and check that in onResume on the main activity. — Tony Maro, Dec 18 '12 at 17:18

score 1 · Answer 2 · edited May 23 '17 at 12:30

1

I think its not possible to close entire application. see these links it may help you.

Close Application

How to exit an Android Application

It may help you check it.

android.os.Process.killProcess(android.os.Process.myPid())

edited May 23 '17 at 12:30

Community

1
1

answered Dec 19 '11 at 13:19

Yugandhar Babu

10,311
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score 1 · Answer 3 · answered Dec 19 '11 at 13:30

call the moveTaskToBack() method inside the onKeyDown.

    @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        moveTaskToBack(true);
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

BeckyPinoco · Answer 4 · 2013-01-03T03:21:18.530

0

In this case, I'm using this code:

public boolean onKeyDown(int keyCode, KeyEvent event) 
{
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        android.os.Process.killProcess(android.os.Process.myPid());
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

It work for me.

edited Jan 03 '13 at 03:21

answered Jan 03 '13 at 03:14

BeckyPinoco

39
3

Madi · Answer 5 · 2015-11-24T07:05:39.800

0

Add this code on your activity When clicked android back button application closed but running in background! You can add finish() and System.exit(0)

@Override
public void onBackPressed() {
    super.onBackPressed();
    moveTaskToBack(true);
}

edited Nov 24 '15 at 07:05

answered Nov 24 '15 at 06:26

Madi

1,805
1
15
9

score 0 · Answer 6 · answered Dec 19 '11 at 12:37

0

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        finish();
        return true; //not sure this is needed
    }
    return super.onKeyDown(keyCode, event);
}

answered Dec 19 '11 at 12:37

ikromm

523
6
13

3

-1 finish() just closes the current activity but not the whole application. – schlingel Dec 19 '11 at 12:41

score 0 · Answer 7 · answered Dec 19 '11 at 12:38

0

You can Call finish(); in back button

answered Dec 19 '11 at 12:38

Arun Kumar

877
3
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-1 finish() just closes the current activity but not the whole application. – schlingel Dec 19 '11 at 12:40
Actually before it,a thread is working means a background Activity will call,when i do finish then activity will not finish it will reopen – user1061793 Dec 19 '11 at 12:41
hmm it will close the current activity. – user1061793 Dec 19 '11 at 12:41

score 0 · Answer 8 · answered Dec 19 '11 at 12:42

0

whenever you starts an activity just put

finish();

before

startActivity(intent);

This is the way to close your application with back button.

answered Dec 19 '11 at 12:42

abhishek ameta

194
1
12

I can't understand what you exactly want?? – abhishek ameta Dec 19 '11 at 12:55
1

The whole android framework is designed around a lifecycle (see link above). Misusing such methods (for example if you have a activity for sending a sms finishing it on the click of the send button is OK) for existing apps is against the design principile. This is very bad for UX. As mentioned in the first link of Yugandhar. – schlingel Dec 19 '11 at 13:05

How to close our application in back button in android

8 Answers8