How to exit an android app from any screen by using "back key" in android?

Question

I'm new to android.. I'm creating a sample app with 2 pages.. simply I want to exit my app if I press "back key" in android from any screen.. for ex: consider that I'm in page 2 and I'm pressing back key, now I want my app to exit rather than going to page 1.

IntelliJ Amiya · Answer 1 · 2017-05-11T06:59:22.047

1

FYI .

At first add finish method when calling Intent

Intent intOBJ = new Intent(ActivityA.this, ActivityB.class);
startActivity(intOBJ );
finish();

Then goto ActivityB.class

Add this onBackPressed() method

@Override
    public void onBackPressed() 
     {
            super.onBackPressed();
            this.finish();
     }

finish()->Call this when your activity is done and should be closed. The ActivityResult is propagated back to whoever launched you via onActivityResult().

edited May 11 '17 at 06:59

answered May 11 '17 at 06:20

IntelliJ Amiya

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I am not agree with this. It will return to Activity 1. – Harry T. May 11 '17 at 06:24
@TruongHieu Kindly review my answer – IntelliJ Amiya May 11 '17 at 06:30
You only call the launcher and finish 2nd activity, but the first one still there. – Harry T. May 11 '17 at 06:32
@TruongHieu then when launching new activity you must add `finish() ;` – IntelliJ Amiya May 11 '17 at 06:37
where do I need to add this? in my activity 1 onBackPressed()? or in activity 2? @Amiya – Vijay May 11 '17 at 06:44
@Vijay at first when you call Activity 2 add `finish();` and then goto Activity 2 and write `onBackPressed` method – IntelliJ Amiya May 11 '17 at 06:49
I think like I'm confusing you @Amiya.. let me explain little more clearly.. I'm now in activity 2 and I want to go exit my app and I don't want this to take me to activity 1 instead.. I have tried your code but it takes me to Activity 1. – Vijay May 11 '17 at 06:55
nope not yet..!! @Amiya – Vijay May 11 '17 at 06:57

score 1 · Answer 2 · edited Jun 20 '20 at 09:12

1

Each activity you have to override onBackPressed method. In this method you call a method name

this.finish(); or finish();

edited Jun 20 '20 at 09:12

Community

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answered May 11 '17 at 06:22

faran.javed

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I am not agree with this. It will return to Activity 1. – Harry T. May 11 '17 at 06:23
For this you must have to start second activity like this. `Intent intent = new Intent(this , secondActivity.this); startActivity(intent); finish();` – faran.javed May 11 '17 at 06:28

score 0 · Answer 3 · answered May 11 '17 at 06:13

0

Each activity you have to override onBackPressed method.

Then you type

finishAffinity();    
System.exit(0);

answered May 11 '17 at 06:13

Harry T.

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do not use `System.exit(0)` in android – shinilms May 11 '17 at 06:21
@ShinilMS why not dude? – Harry T. May 11 '17 at 06:24
2

You should not call System.exit(). It could mess up Android's handling of the lifecycles of your activities and result in an awkward user-experience (e.g. when killing the process, the previous activity from which you launched your activity may be gone as well. Android may try to restart the process again and re-create that accidentally killed parent-activity) – shinilms May 11 '17 at 06:27
I have tried using finish() in activity 2; but it is taking me to activity 1.. but I want my app to exit.. – Vijay May 11 '17 at 06:31
@ShinilMS you was correct. – Harry T. May 11 '17 at 06:36

shinilms · Answer 4 · 2017-05-11T06:29:52.063

0

call finish(); after you start an intent from an activity.

eg:

Intent i = new Intent(ActivityA.this, ActivityB.class);
startActivity(i);
finish();

edited May 11 '17 at 06:29

answered May 11 '17 at 06:19

shinilms

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I am not agree with this. It will return to Activity 1. – Harry T. May 11 '17 at 06:24
have you tried it? – shinilms May 11 '17 at 06:28
Yes it is taking me to activity 1 from page2( or activity 2) – Vijay May 11 '17 at 06:33
Sorry about that. I was wrong. It will finish the previous activity after starting new one. This can be an acceptable answer. – Harry T. May 11 '17 at 06:33
@Vijay show what you've done – shinilms May 11 '17 at 08:18

score 0 · Answer 5 · answered May 11 '17 at 06:59

0

@Override
public void onBackPressed() {
    android.os.Process.killProcess(android.os.Process.myPid());
    System.exit(1);
}

answered May 11 '17 at 06:59

Md Mobinur Rahman

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Don't do this. Use finish(); – DKIT May 11 '17 at 13:57

How to exit an android app from any screen by using "back key" in android?

5 Answers5

this.finish(); or finish();