how to close android app completely

Question

I created an android application with a logout option in onCreateOptionsMenu. The Logout works perfectly but when I press the back button again it takes me to the previous activity, and when it gets a null value it redirects to login screen. Now my login screen appears again and again. I want to close the app completely when I press the back button but don't know how.

Here is my code to handle the back button press in the login screen:

@Override
public void onBackPressed() {
    new AlertDialog.Builder(this)
        .setTitle("BidNEMO")
        .setMessage("Are you sure you want to exit?")
        .setNegativeButton(android.R.string.no, null)
        .setPositiveButton(android.R.string.yes, new OnClickListener() {
         public void onClick(DialogInterface arg0, int arg1) {
         Main.super.onBackPressed();
         finish();
         }
         }).create().show();
     }

please help guyss..

possible duplicate of [Android: Proper Way to use onBackPressed()](http://stackoverflow.com/questions/6413700/android-proper-way-to-use-onbackpressed) — Tabrej Khan, Jan 15 '14 at 06:33

score 61 · Accepted Answer · edited May 21 '14 at 04:56

61

To Quit Application on Button click use this code :

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
startActivity(intent);

Try it..

To kill the complete app and remove it from Runningapp list kill the app through its pid(its nasty)... use this lines before above code.

int pid = android.os.Process.myPid();
android.os.Process.killProcess(pid);

edited May 21 '14 at 04:56

David

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answered Jan 15 '14 at 06:33

Amresh

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4

you are just calling home via intent. How is it different from calling another activity's intent. i dont think the app will close. instead it will minimize. – SMR Feb 20 '14 at 12:51
whats your requirement ?? – Amresh Feb 20 '14 at 13:13
I just want to make sure that the above code *Actually Quits* the app or just brings home screen on front. just to be clear :) – SMR Feb 20 '14 at 13:20
It Quits the app... Do check it – Amresh Feb 20 '14 at 13:22
**Only** if you also include `super.onBackPressed()` and no other activity is in the `backstack` other wise it does't. – SMR Feb 20 '14 at 13:27
It was a general answer.... i have just posted the required code which can be used anywhere.. and i have clearly mentioned `on Button` click. – Amresh Feb 20 '14 at 13:31
1

let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/47956/discussion-between-smr-and-ryderz) – SMR Feb 20 '14 at 13:34
KillProcess should be killProcess, the first letter K be small k, fixed. – David May 21 '14 at 04:56
Thank you guys! Saved my neck, also the chat was helpful! – rgv Dec 21 '15 at 22:16

score 24 · Answer 2 · answered Oct 28 '14 at 12:29

24

If you want to close application completely you should use finishAffinity(); instead of finish() . It will clear all stack of activities previously opened by an application.

answered Oct 28 '14 at 12:29

Anonymous

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`finishAffinity()` is only available in API level 16 or higher. – Nj Subedi Nov 30 '14 at 13:15

score 12 · Answer 3 · answered Apr 02 '18 at 01:17

12

For API 21 and up

finishAndRemoveTask()

You can call this to close the app completely. All activities will finish() and the app is removed from the task list.

answered Apr 02 '18 at 01:17

Mick Ashton

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4
15

it didn't work when I have another activity below current activity. finishAffinity worked however. – BabyishTank Oct 23 '21 at 18:06
You can check before if the activity is the root activity with `isTaskRoot()`. Then it works great. – Megaetron Jun 21 '23 at 11:30

score 5 · Answer 4 · edited Mar 28 '16 at 08:11

5

To Finish an Activity I'm using this code:

public void appExit () {
    this.finish();
    Intent intent = new Intent(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_HOME);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
}  //close method

or kill Process with this code:

int pid = android.os.Process.myPid();
android.os.Process.killProcess(pid);

edited Mar 28 '16 at 08:11

MUMBUÇOĞLU

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answered Jan 15 '14 at 06:39

chiru

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KillProcess should be killProcess, the first letter K be small k, fixed. – David May 21 '14 at 04:56

Roy Doron · Answer 5 · 2017-06-12T11:37:02.627

For Xamarin Users:

int pid = Android.OS.Process.MyPid();
Android.OS.Process.KillProcess(pid);

put it in your OnDestroy() function.

Edit:

After investigating it thoroughly, I found out that even the above code I wrote does not "Kill" the app totally (deleting it from task manager - "recent apps"). Eventually, after a lot of code tryouts, I managed to figure something out, Overriding "Finish" functions with this code:

public override void Finish()
    {
        if (Android.OS.Build.VERSION.SdkInt >= BuildVersionCodes.Lollipop)
        {
            base.FinishAndRemoveTask();
        }
        else
        {
            base.Finish();
        }
    }

this is the sole solution for that question!

score 0 · Answer 6 · edited May 23 '17 at 12:03

Even if it looks ok killing process will cause you headache in future. You can ensure this by following use case:

call several activities to populate activities stack
call android.os.Process.killProcess(pid);
open your application

OBSERVED: Your application opens not from main activity in inconsistent way. This is because Android consider killing of process like crash.

You can find more detailed information here: Is quitting an application frowned upon?

score 0 · Answer 7 · answered Oct 05 '16 at 17:36

0

android.os.Process.killProcess(android.os.Process.myUid());

I think this is better. How about it ?

answered Oct 05 '16 at 17:36

AlienKilleR

1

score 0 · Answer 8 · edited Jul 23 '23 at 09:38

0

SOLUTION 2023

Closing the application with process removal, it gives the result of a smooth closing and removal of all application processes after 100 milliseconds:

override fun exit() {
    coroutine.launch(Dispatchers.Main) {
        finishAndRemoveTask()
        delay(100)
        exitProcess(0)
    }
}

edited Jul 23 '23 at 09:38

starball

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answered Jul 23 '23 at 08:40

Владислав Шестернин

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how to close android app completely

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