Example usage for android.support.v4.app FragmentManager popBackStackImmediate

Introduction

In this page you can find the example usage for android.support.v4.app FragmentManager popBackStackImmediate.

Prototype

public abstract boolean popBackStackImmediate(int id, int flags);

Source Link

Document

Like #popBackStack(int,int) , but performs the operation immediately inside of the call.

Usage

From source file:uk.co.nevarneyok.ux.MainActivity.java

/**
 * Method clear fragment backStack (back history). On bottom of stack will remain Fragment added by {@link #addInitialFragment()}.
 *///from   w  w w  .j av  a  2s. c o  m
private void clearBackStack() {
    Timber.d("Clearing backStack");
    FragmentManager manager = getSupportFragmentManager();
    if (manager.getBackStackEntryCount() > 0) {
        if (BuildConfig.DEBUG) {
            for (int i = 0; i < manager.getBackStackEntryCount(); i++) {
                Timber.d("BackStack content_%d= id: %d, name: %s", i, manager.getBackStackEntryAt(i).getId(),
                        manager.getBackStackEntryAt(i).getName());
            }
        }
        FragmentManager.BackStackEntry first = manager.getBackStackEntryAt(0);
        manager.popBackStackImmediate(first.getId(), FragmentManager.POP_BACK_STACK_INCLUSIVE);
    }
    Timber.d("backStack cleared.");
    //        TODO maybe implement own fragment backStack handling to prevent banner fragment recreation during clearing.
    //        http://stackoverflow.com/questions/12529499/problems-with-android-fragment-back-stack<
}

From source file:org.comixwall.pffw.MainActivity.java

/**
 * Select the fragment to display./* w w w  .  j  a va 2  s.c o  m*/
 * We modify the backstack ourselves so that no fragment is pushed to the backstack twice.
 * So if a fragment which is already in the backstack is selected, we roll back the backstack
 * to its position.
 * <p>
 * We never push the Dashboard fragment to the backstack because it is always
 * the first fragment displayed (if we push it to the backstack too, pressing the back button
 * while Dashboard fragment is displayed causes a blank activity screen).
 *
 * @param item The menu item selected.
 * @return See {@link NavigationView.OnNavigationItemSelectedListener}
 */
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    // Ignore requests for the same fragment already displayed
    if (!mMenuItems2Fragments.get(id).isInstance(fragment)) {
        FragmentManager fm = getSupportFragmentManager();

        boolean add = true;

        if (id == R.id.menuDashboard) {
            // Dashboard is the main fragment, should never be removed,
            // so remove all backstack entries first to reach the first Dashboard.
            popAllBackStack();

            // Never add Dashboard to the backstack
            add = false;
            fragment = new Dashboard();

            // ATTENTION: menuDashboard does not check initially, so we need to manage it ourselves
            item.setChecked(true);
        } else {
            // TODO: Check why android:checkableBehavior="single" does not uncheck menuDashboard
            MenuItem itemDashboard = navigationView.getMenu().findItem(R.id.menuDashboard);
            if (itemDashboard.isChecked()) {
                itemDashboard.setChecked(false);
            }

            try {
                fragment = (Fragment) mMenuItems2Fragments.get(id).getConstructor().newInstance();
            } catch (Exception e) {
                e.printStackTrace();
                logger.severe("EXCEPTION: " + e.toString());
                return false;
            }
        }

        String fragmentName = fragment.getClass().getSimpleName();

        // Rolls back the backstack if the fragment is already in
        if (!fm.popBackStackImmediate(fragmentName, 0)) {
            android.support.v4.app.FragmentTransaction transaction = fm.beginTransaction();
            transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);

            if (add) {
                transaction.addToBackStack(fragmentName);
            }

            // TODO: Check if we need to pass any args
            //fragment.setArguments(getIntent().getExtras());
            transaction.replace(R.id.fragmentContainer, fragment);

            transaction.commit();
        }
    } else {
        logger.finest("onNavigationItemSelected will not show the same fragment");
    }

    drawer.closeDrawer(GravityCompat.START);
    createOptionsMenu();
    return true;
}