Application Level onResume Android

Question

Problem

The idea is very simple. Whenever an user comes back to my app from the Recents I want to show a simple dialog prompting with the password.

I know how to prompt the dialog with password, but my problem is how do I understand that the user has entered my app from the recents. If I put the prompt in the onResume in every activity, then it will get triggered everytime even if the user doesn't enter from the Recents menu.

There are lots of activities and fragments in my app. So, I would love to have a more generic or application level solution.

@GopalSinghSirvi As I said before, if I do that it will get triggerred everytime even if the user doesn't enter from recents. — Aritra Roy, Feb 24 '15 at 09:24

Shahab Rauf · Answer 1 · 2018-10-31T14:22:53.210

22

Implement Application.ActivityLifecycleCallbacks, that will provide all activity callback in your application class.

public class AppController extends Application implements  
Application.ActivityLifecycleCallbacks  
{   
    @Override
    public void onCreate() {
        super.onCreate();
        registerActivityLifecycleCallbacks(this);

    }


    @Override
    public void onActivityCreated(Activity activity, Bundle bundle) {

    }

    @Override
    public void onActivityStarted(Activity activity) {

    }

    @Override
    public void onActivityResumed(Activity activity) {

    }

    @Override
    public void onActivityPaused(Activity activity) {

    }

    @Override
    public void onActivityStopped(Activity activity) {

    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {

    }

    @Override
    public void onActivityDestroyed(Activity activity) {

    }
}

edited Oct 31 '18 at 14:22

answered Jan 04 '16 at 15:53

Shahab Rauf

3,651
29
38

3

in onCreate() you must add registerActivityLifecycleCallbacks(this); – Orlay Garcia Duconge Apr 10 '18 at 15:36
are these methods called for lifecycle changes of all the activities? – Abdullah Umer Mar 31 '19 at 14:24
Yes. These are called for all activites. – Ahmed Shahid Jun 11 '20 at 11:11
It doesn't work for activities with implicit intent (such as `new Intent(Settings.*)`). – Oleg Golomoz Sep 03 '20 at 09:04

score 2 · Answer 2 · edited May 23 '17 at 11:46

2

You could try with this flag FLAG_ACTIVITY_LAUNCHER_FROM _HISTORY:

if((getIntent().getFlags() & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY )!=0){
    Log.d(TAG, "Called from history");
    //clear flag from history
    Intent intent = getIntent().setFlags( getIntent().getFlags() & (~ Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY));
    setIntent(intent);
}

Source : Android - detecting application launch from home or history

When "A" Activity is start from recent, this flag is present. Now this flag will be also present if "A" activity call "B" activity and on "B" user press back. So you have to check flag and when you detect it you have clear intent by removing this flag, source: Remove a Paint Flag in Android

edited May 23 '17 at 11:46

Community

1
1

answered Feb 24 '15 at 09:25

LaurentY

7,495
3
37
55

That's perfect. Unfortunately I didn't remember this simple callback. Thanks a ton. – Aritra Roy Feb 24 '15 at 09:41
I just checked that this doesn't solve my problem. If I move from one activity to the other and come back then also the onRestart is getting triggered. I need a way to prompt the password only when it is resumed from the recents. – Aritra Roy Feb 24 '15 at 19:04
@Aritra I add another solution – LaurentY Feb 25 '15 at 08:29
@LaurentY I have placed your new code in the onResume() but it doesn't work at all. I have tried visiting my app from the Recents but this condition is never true. – Aritra Roy Feb 25 '15 at 15:17
@LaurentY Hi, can I get another solution or a modified solution for this? I really need this. – Aritra Roy Feb 27 '15 at 12:34
@Aritra please try to clear intent, I update my answer – LaurentY Feb 27 '15 at 14:18
@LaurentY I don't know why, but this flag is never set what ever I try. – Aritra Roy Feb 28 '15 at 18:48
@Aritra I not reproduce your issue, I update my answer, I added "setIntent" method after set flags – LaurentY Mar 03 '15 at 09:27

score 1 · Answer 3 · answered Feb 24 '15 at 09:47

Try below sample

    /**
 * TODO : After update to API level 14 (Android 4.0),
 * We should implement Application.ActivityLifecycleCallbacks
 */
public class GlobalApplication extends android.app.Application
{
    private boolean inForeground = true;
    private int resumed = 0;
    private int paused = 0;

    public void onActivityResumed( Activity activity )
    {
        ++resumed;

        if( !inForeground )
        {
            // Don't check for foreground or background right away
            // finishing an activity and starting a new one will trigger to many
            // foreground <---> background switches
            //
            // In half a second call foregroundOrBackground
        }
    }

    public void onActivityPaused( Activity activity )
    {
        ++paused;

        if( inForeground )
        {
            // Don't check for foreground or background right away
            // finishing an activity and starting a new one will trigger to many
            // foreground <---> background switches
            //
            // In half a second call foregroundOrBackground
        }
    }

    public void foregroundOrBackground()
    {
        if( paused >= resumed && inForeground )
        {
            inForeground = false;
        }
        else if( resumed > paused && !inForeground )
        {
            inForeground = true;
        }
    }
}

Put below code in your all activities.

  public class BaseActivity extends android.app.Activity
{
    private GlobalApplication globalApplication;

    @Override
    protected void onCreate()
    {
        globalApplication = (GlobalApplication) getApplication();
    }

    @Override
    protected void onResume()
    {
        super.onResume();
        globalApplication.onActivityResumed(this);
    }

    @Override
    protected void onPause()
    {
        super.onPause();
        globalApplication.onActivityPaused(this);
    }

    @Override
    public void onDestroy()
    {
        super.onDestroy();
    }
}

I will try this one and tell you. – Aritra Roy Feb 24 '15 at 12:07 — Aritra Roy, Feb 24 '15 at 12:07

score -1 · Answer 4 · answered Oct 10 '19 at 14:40

-1

I would suggest using LifecycleObserver. If your Application class implements this interface it marks a class as a LifecycleObserver, it does not have any methods, instead, it relies on OnLifecycleEvent annotated methods. The usage is simple:

public class AndroidApplication extends Application implements LifecycleObserver {

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    public void onAppStart() {
         //enter code here
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public void onAppStop() {
         //enter code here
    }

    ...etc
}

With Lifecycle.Event you can access all lifecycle states through Enum. It is part of androidx.

answered Oct 10 '19 at 14:40

Mato_Vilac

77
1
8

Where do you attach this observer? How is it triggered? – Ahmed Shahid Jun 11 '20 at 11:20
I think it can't be more straightforward than it is shown in example. Implement LifecycleObserver, use it as shown (thats how you attach it). How is it triggered? Actually you don't care, you are not the one triggering it, OS and app states are the one triggering it. – Mato_Vilac Jun 12 '20 at 12:24

Application Level onResume Android

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