Back press to the previous fragment or home in android

Question

I am trying to do back press moving to the previous fragment or to home fragment in my app, kindly guide me to achieve it. Thanks in advance

Hello and welcome to StackOverflow. What have you done and what is your problem ? — Bruno, May 12 '21 at 07:47
Please refer to this answer for your question - https://stackoverflow.com/questions/7992216/android-fragment-handle-back-button-press — Sasaki, May 12 '21 at 08:12

Omicron · Answer 1 · 2021-05-12T08:08:29.113

0

Add addToBackstack(null) When You change fragments in your activity, like so:

getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new Fragment()).addToBackStack(null).commit();

Whenever you add a fragment to backstack it will be poped from it when You press back button and app will return to previous fragment that was also added to backstack.

edited May 12 '21 at 08:08

answered May 12 '21 at 07:22

Omicron

365
4
9

score 0 · Answer 2 · answered May 12 '21 at 09:19

I use this code to navigate between the fragments

this method is responsible to load require fragment

public void loadFragment(Fragment fragment, String tag) {
        if (fragment != null) {
            getSupportFragmentManager()
                    .beginTransaction()
                    .replace(R.id.fragment_container, fragment, tag)
                    .commit();
        }
    }

to load a fragment use:

loadFragment(new HomeFragment(), "HomeFragment");

handle back press like this in your activity:

@Override
    public void onBackPressed() {
        HomeFragment homeFragment = (HomeFragment) getSupportFragmentManager().findFragmentByTag("HomeFragment");
        SearchFragment searchFragment = (SearchFragment) getSupportFragmentManager().findFragmentByTag("ConnectionFragment");
        NotificationFragment notificationFragment = (NotificationFragment) getSupportFragmentManager().findFragmentByTag("NotificationFragment");

        if (homeFragment != null && homeFragment.isVisible()) {
            finish();
        }
        if (searchFragment != null && searchFragment.isVisible()) {
            loadFragment(new HomeFragment(), "HomeFragment");
            navigationView.setSelectedItemId(R.id.navigation_home);

        }
        if (notificationFragment != null && notificationFragment.isVisible()) {
            loadFragment(new HomeFragment(), "HomeFragment");
            navigationView.setSelectedItemId(R.id.navigation_home);

        }

    }

Back press to the previous fragment or home in android

2 Answers2