Return to previous fragment from other activity

Question

I have a simple problem. My problem is that I have two activities:

Activity A
Activity B

In Activity A I display 4-5 fragments. That is the main activity (Navigation Drawer) so I display 4-5 fragments in it.

From all fragments it redirects to Activity B.

But I want to display the last opened fragment when I come back from Activity B.

Now it directly opens the first fragment, which is the default. I want to open the last opened fragment when the user returns to the first activity.

Please help me...

check this ref: http://stackoverflow.com/questions/26754940/appcompatv7-v21-navigation-drawer-not-showing-hamburger-icon?rq=1 — Damini Mehra, Aug 17 '16 at 08:28
Could you please provide part of code where your first activity initialises and opens default fragment (I assume it is your onCreate method in Activity A)? Thank you. — Michael Spitsin, Aug 17 '16 at 08:39
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); if (navigationView != null) { Home homeFragment = new Home(); homeFragment.setArguments(getIntent().getExtras()); getSupportFragmentManager().beginTransaction() .add(R.id.fragment_container, homeFragment, "HOME").commit(); setupDrawerContent(navigationView); } — Aaaaaa1212, Aug 17 '16 at 08:44
Could you please pase it in your question for more readability? — Michael Spitsin, Aug 17 '16 at 09:49

ziLk · Answer 1 · 2016-08-17T11:04:06.170

0

If your first activity changes with the second one, then fragments of the former activity will destroy themself because of the activity lifecycle.

You should just open first activity using startActivity and store the last active fragment before it goes the letter activity.

edited Aug 17 '16 at 11:04

answered Aug 17 '16 at 08:31

ziLk

3,120
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45

score 0 · Answer 2 · edited Apr 18 '19 at 03:19

0

You don't use finish while call second activity. For exp: `

 Intent i = new Intent(getApplicationContext(), ActivityB.class);
 startActivity(i);
 //finish(); `

edited Apr 18 '19 at 03:19

John Joe

12,412
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answered Aug 17 '16 at 08:32

emre akkaya

31
3

I didnt Used finish(); – Aaaaaa1212 Aug 17 '16 at 09:42
1

Wrong answer. You have to consider the activity lifecycle – Pablo Insua May 28 '18 at 15:33

score 0 · Answer 3 · answered Aug 17 '16 at 10:07

You can use onSaveInstanceState in Activity A to save information about last opened fragment and onRestoreInstanceState/onCreate to restore this information. For example:

private static final String LAST_OPENED_FRAGMENT_REF = "LAST_OPENED_FRAGMENT_REF";
private static final int HOME_FRAGMENT = 0;
private static final int OTHER_FRAGMENT = 1;

private int currentOpenedFragment = HOME_FRAGMENT;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ...
    if (savedInstanceState != null) {
        currentOpenedFragment = savedInstanceState.getInt(LAST_OPENED_FRAGMENT_REF);
    }
    if (navigationView != null) {
        Fragment fragment = initFragmentByType(currentOpenedFragment);
        getSupportFragmentManager()
            .beginTransaction()
            .add(R.id.fragment_container, fragment)
            .commit();
        setupDrawerContent(navigationView);
    }
    ...
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt(LAST_OPENED_FRAGMENT_REF, currentOpenedFragment);
}

private Fragment initFragmentByType(int type) {
    switch(type) {
        case HOME_FRAGMENT: return new Home();
        case OTHER_FRAGMENT: return new Other();
        default: throw new IllegalArgumentException("There is no type: " + type);
    }
}

And don't forget to update currentOpenedFragment field in onNavigationItemSelected callback.

Return to previous fragment from other activity

3 Answers3