Example usage for android.app FragmentManager addOnBackStackChangedListener

Introduction

In this page you can find the example usage for android.app FragmentManager addOnBackStackChangedListener.

Prototype

public abstract void addOnBackStackChangedListener(OnBackStackChangedListener listener);

Source Link

Document

Add a new listener for changes to the fragment back stack.

Usage

From source file:oly.netpowerctrl.main.MainActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
    FragmentUtils.applyActivityFlags(this);

    super.onCreate(savedInstanceState);

    assignContentView();/*from  w w  w  . j av  a 2 s . com*/

    FragmentManager fm = getFragmentManager();
    fm.addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
        @Override
        public void onBackStackChanged() {
            if (firstFragment) {
                firstFragment = false;
                return;
            }
            getSupportActionBar().setDisplayHomeAsUpEnabled(getFragmentManager().getBackStackEntryCount() > 1);
            //                if (getFragmentManager().getBackStackEntryCount() <= 1) {
            //                    Toast.makeText(MainActivity.this, getString(R.string.press_back_to_exit), Toast.LENGTH_SHORT).show();
            //                }
        }
    });
}

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From source file:com.android.tv.ui.TvOverlayManager.java

private void runAfterSideFragmentsAreClosed(final Runnable runnable) {
    final FragmentManager manager = mMainActivity.getFragmentManager();
    if (mSideFragmentManager.isSidePanelVisible()) {
        manager.addOnBackStackChangedListener(new OnBackStackChangedListener() {
            @Override/*w ww  . j  a  va2 s  .c  o m*/
            public void onBackStackChanged() {
                if (manager.getBackStackEntryCount() == 0) {
                    manager.removeOnBackStackChangedListener(this);
                    runnable.run();
                }
            }
        });
    } else {
        runnable.run();
    }
}

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From source file:it.scoppelletti.mobilepower.app.FragmentLayoutController.java

/**
 * Ripristina lo stato dell’istanza.
 * /*from www . j  av  a 2s  .  c  o  m*/
 * <P>L&rsquo;attivit&agrave; ripristina lo stato dell&rsquo;istanza
 * {@code FragmentLayoutController} all&rsquo;interno del proprio metodo
 * {@code onRestoreInstanceState}.</P>
 * 
 * @param savedInstanceState Stato dell&rsquo;istanza.
 * @param fragmentCollector  Collettore dei frammenti di dettaglio. 
 */
public void onRestoreInstanceState(Bundle savedInstanceState,
        FragmentLayoutController.FragmentCollector fragmentCollector) {
    int n, oldPanelCount, tnId;
    String tag;
    ActivitySupport activitySupport;
    FragmentSupport fragment;
    FragmentManager fragmentMgr;
    FragmentLayoutController.BackStackChangedListener backStackListener;
    Queue<FragmentSupport> fragmentQueue;
    Queue<FragmentLayoutController.FragmentEntry> clonedQueue;

    if (savedInstanceState == null) {
        throw new NullPointerException("Argument savedInstanceState is null.");
    }
    if (fragmentCollector == null) {
        throw new NullPointerException("Argument fragmentCollector is null.");
    }

    if (!(myActivity instanceof ActivitySupport)) {
        myLogger.warn("Activity not implement interface ActivitySupport.");
        return;
    }

    oldPanelCount = savedInstanceState.getInt(FragmentLayoutController.STATE_PANELCOUNT, 0);
    if (oldPanelCount < 1) {
        myLogger.warn("Unexpected {}={} in saved instance state.", FragmentLayoutController.STATE_PANELCOUNT,
                oldPanelCount);
        return;
    }

    myLogger.debug("{}: current={}, saved instance state={}.",
            new Object[] { FragmentLayoutController.STATE_PANELCOUNT, myFrameCount, oldPanelCount });
    if (oldPanelCount == myFrameCount) {
        // Il numero di pannelli non e' cambiato:
        // Il sistema ha gia' ripristinato correttamente i frammenti.
        return;
    }

    fragmentQueue = new ArrayDeque<FragmentSupport>();
    fragmentCollector.collectFragments(fragmentQueue);

    // Ad ogni frammento associo il tag con il quale &egrave; stato
    // inserito
    clonedQueue = new ArrayDeque<FragmentLayoutController.FragmentEntry>();
    while (!fragmentQueue.isEmpty()) {
        fragment = fragmentQueue.remove();
        if (fragment == null) {
            myLogger.warn("Ignoring null.");
            continue;
        }

        tag = fragment.asFragment().getTag();
        if (StringUtils.isBlank(tag)) {
            myLogger.warn("Ignoring fragment with empty tag.");
            continue;
        }

        clonedQueue.offer(new FragmentLayoutController.FragmentEntry(fragment.cloneFragment(), tag));
    }

    fragmentQueue = null; // free memory

    activitySupport = (ActivitySupport) myActivity;
    fragmentMgr = activitySupport.getSupportFragmentManager();

    // Ripristino la configurazione dei frammenti iniziale
    for (n = fragmentMgr.getBackStackEntryCount(); n > 0; n--) {
        fragmentMgr.popBackStack();
    }

    if (myFrameCount > 1) {
        tnId = arrangeFragments(fragmentMgr, clonedQueue);
    } else {
        tnId = arrangePanel(fragmentMgr, clonedQueue);
    }

    if (Build.VERSION.SDK_INT < BuildCompat.VERSION_CODES.HONEYCOMB) {
        return;
    }

    // - Android 4.1.2
    // La barra delle azioni non e' correttamente aggiornata forse perche'
    // si assume che non ce ne sia bisogno con transazioni schedulate
    // durante il ripristino dell'attivita' (o magari perche' non e' proprio
    // previsto che si schedulino transazioni durante il ripristino
    // dell'attivita'):
    // Visto che l'esecuzione delle transazioni e' asincrona, devo
    // utilizzare un gestore degli eventi di modifica del back stack che
    // gestisca l&rsquo;ultima transazione che ho schedulato.
    backStackListener = new FragmentLayoutController.BackStackChangedListener(myActivity, fragmentMgr, tnId);
    fragmentMgr.addOnBackStackChangedListener(backStackListener);
}

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From source file:com.bernard.beaconportal.activities.activity.MessageList.java

private void initializeFragments() {
    FragmentManager fragmentManager = getFragmentManager();
    fragmentManager.addOnBackStackChangedListener(this);

    boolean hasMessageListFragment = (mMessageListFragment != null);

    if (!hasMessageListFragment) {
        FragmentTransaction ft = fragmentManager.beginTransaction();
        mMessageListFragment = MessageListFragment.newInstance(mSearch, false,
                (K9.isThreadedViewEnabled() && !mNoThreading));
        ft.add(R.id.message_list_container, mMessageListFragment);
        ft.commit();/*from   www.  j  a v  a 2s .co  m*/
    }

    // Check if the fragment wasn't restarted and has a MessageReference in
    // the arguments. If
    // so, open the referenced message.
    if (!hasMessageListFragment && mMessageViewFragment == null && mMessageReference != null) {
        openMessage(mMessageReference);
    }
}

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From source file:com.bernard.beaconportal.activities.activity.MessageList.java

/**
 * Create fragment instances if necessary.
 * /*from w  w w  .ja v a2s .c o m*/
 * @see #findFragments()
 */

private void removeFragments() {
    FragmentManager fragmentManager = getFragmentManager();
    fragmentManager.addOnBackStackChangedListener(this);

    boolean hasMessageListFragment = (mMessageListFragment != null);

    if (!hasMessageListFragment) {
        FragmentTransaction ft = fragmentManager.beginTransaction();
        mMessageListFragment = MessageListFragment.newInstance(mSearch, false,
                (K9.isThreadedViewEnabled() && !mNoThreading));
        // ft.remove(mMessageListFragment);
        ft.commit();

        Log.d("removed fragment?", "yes");
    }

    // Check if the fragment wasn't restarted and has a MessageReference in
    // the arguments. If
    // so, open the referenced message.
    if (!hasMessageListFragment && mMessageViewFragment == null && mMessageReference != null) {
        openMessage(mMessageReference);
    }
}

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