Confirm closing the app on back pressed ONLY in MainAcitity?

Question

I want the user to confirm closing my app. I use the following code for that in my MainActivity:

@Override
public void onBackPressed() {
    if (this.lastBackPressTime < System.currentTimeMillis() - 4000) {
        toast = Toast.makeText(this, "Press back again to close this app", Toast.LENGTH_LONG);
        toast.setGravity(Gravity.CENTER, 0, 0);
        toast.show();
        this.lastBackPressTime = System.currentTimeMillis();
    } else {
        if (toast != null) {
            toast.cancel();
        }
        super.onBackPressed();
    }
}

In other classes I use this:

@Override public void onBackPressed() {
    if (!mWebView.onBackPressed()) { return; }
    // ...
    super.onBackPressed(); }

Now I get the confirm event in EVERY class, but I only want it in my MainActivity. How can I do that?

Note: I have to extent my MainActivity in other classes. That should be the main problem to solve, but I still dont know how exactly?

score 0 · Answer 1 · answered Apr 15 '16 at 11:49

0

Try using this in your main activity

 private boolean exit = false;
@Override
public void onBackPressed()
{
    if (exit) {
        finish(); // finish activity
    } else {
        Toast.makeText(this, "Press Back again to Exit.",
                       Toast.LENGTH_SHORT).show();
        exit = true;
        new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    exit = false;
                }
            }, 3 * 1000);

    }
}

answered Apr 15 '16 at 11:49

user5894647

544
6
15

1

You should not use Handler for that. – marshallino16 Apr 15 '16 at 11:50
So is this a bad solution? – AlexioVay Apr 15 '16 at 12:32
@Vaia in my perspective its correct you can even try it and see ,,,, when the user is in mainactivity and presses a back button a toast prompts up askingvto press back again if he really wants to exit – user5894647 Apr 15 '16 at 12:37
@Vaia did you add it in the last activity where the user can close the app by pressing back – user5894647 Apr 15 '16 at 12:48
No, only in the MainActivity class – AlexioVay Apr 15 '16 at 12:57
I think the problem is that I have to extent all other classes with MainActivity. – AlexioVay Apr 15 '16 at 13:25

Sanoop Surendran · Answer 2 · 2016-04-15T12:21:17.440

0

Try like this

    Activity activity = this;
    if (activity instanceof MainActivity) {
        if (this.lastBackPressTime < System.currentTimeMillis() - 4000) {
            Toast toast = Toast.makeText(this, "Press back again to close this app", Toast.LENGTH_LONG);
            toast.setGravity(Gravity.CENTER, 0, 0);
            toast.show();
            this.lastBackPressTime = System.currentTimeMillis();
        } else {
            if (toast != null) {
                toast.cancel();
            }
            super.onBackPressed();
        }
    } else {
        super.onBackPressed();
    }

edited Apr 15 '16 at 12:21

answered Apr 15 '16 at 11:49

Sanoop Surendran

3,484
4
28
49

What is `activityObject`? – AlexioVay Apr 15 '16 at 11:54
Hope this will help @Vaia – Sanoop Surendran Apr 15 '16 at 12:09
@Vaia Solved the problem? – Sanoop Surendran Apr 15 '16 at 12:14
I dont see your answer? @Sanoop – AlexioVay Apr 15 '16 at 12:15
What about now? @Vaia – Sanoop Surendran Apr 15 '16 at 12:16
I tried it and it doesn't work. Still happens on all other activities. – AlexioVay Apr 15 '16 at 12:17
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/109245/discussion-between-sanoop-and-vaia). – Sanoop Surendran Apr 15 '16 at 12:18

score 0 · Accepted Answer · answered Apr 15 '16 at 12:03

@Vala, If your adding fragments to the Activty, then you can make use BackSackEntryCount of FragmentManager like below.

  int backStackCount = getSupportFragmentManager().getBackStackEntryCount();
                if (backStackCount == 1) {
                    Toast.makeText(this, "Press back again to close this app", Toast.LENGTH_LONG).show();
                }

if backstackcount is one, it means, on pressing the back button again, remaining frgament will be popped from back stack and app will be quit.

@Vala, Is fragments are adding to ur activity container or ur calling another activity , on top of Main Activity ? — Sangeetha Pinto, Apr 15 '16 at 12:34

Sanjay Kakadiya · Answer 4 · 2016-04-15T14:26:18.163

-1

change other class to

@Override 
public void onBackPressed() {
   if (mWebView.canGoBack()) { return; }
            // ...
   super.onBackPressed(); 
}

edited Apr 15 '16 at 14:26

answered Apr 15 '16 at 11:48

Sanjay Kakadiya

1,596
1
15
32

With this code I cant get back in these other activities at all – AlexioVay Apr 15 '16 at 12:03

Confirm closing the app on back pressed ONLY in MainAcitity?

4 Answers4