viewpager - tabs con iconos android

Android TabLayout ViewPager no inflar el fragmento de tabulación en backstack

Question

Tengo configurada una vista de pestaña que tiene fragmentos personalizados para cada pestaña usando un visor. Este es mi código:

Sosteniendo el fragmento

public class FragInboxMainView extends Fragment implements CGFragment {
    private CGController controller;
    private CGFragment thisFragment;

    @Bind(R.id.inboxViewPager)ViewPager inboxViewPager;
    @Bind(R.id.inboxTabs)TabLayout inboxTabLayout;
    @Bind(R.id.inbox_progress_wheel)ProgressWheel inboxProgressWheel;

    public FragInboxMainView(){}

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_inbox_mainview, container, false);
        ButterKnife.bind(this, rootView);
        thisFragment = this;
        Globals g = Globals.getInstance();
        /** Show loading spinner */
        this.inboxProgressWheel.setBarColor(ContextCompat.getColor(controller.getContext(), g.getUserObject().getUserThemeColor()));
        this.inboxProgressWheel.setVisibility(View.VISIBLE);
        /** Display the profile information based off the ID */
        controller.displayInbox(thisFragment);

        return rootView;
    }


    public void hideProgressSpinner() {
        this.inboxProgressWheel.setVisibility(View.GONE);
    }


    public ViewPager getInboxViewPager() {
        return this.inboxViewPager;
    }

    public TabLayout getInboxTabLayout() {
        return this.inboxTabLayout;
    }
}

Su archivo de diseño

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              xmlns:wheel="http://schemas.android.com/apk/res-auto"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">
    <android.support.design.widget.TabLayout
        android:id="@+id/inboxTabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="scrollable" />
    <com.pnikosis.materialishprogress.ProgressWheel
        android:id="@+id/inbox_progress_wheel"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_gravity="center"
        wheel:matProg_barColor="#5588FF"
        wheel:matProg_progressIndeterminate="true"
        android:visibility="gone"/>


    <android.support.v4.view.ViewPager
        android:id="@+id/inboxViewPager"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="1"
        android:background="@android:color/white" />
</LinearLayout>

Fragmento de pestaña y su archivo de inflación

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    android:id="@+id/main_content"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.baoyz.widget.PullRefreshLayout
        android:id="@+id/tabPullRefresh"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <view
        android:id="@+id/tabRecyclerHolder"
        class="android.support.v7.widget.RecyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingTop="8dp"
        android:paddingBottom="8dp"
        android:clipToPadding="false"
        android:layout_centerInParent="true"/>

    </com.baoyz.widget.PullRefreshLayout>
    <com.melnykov.fab.FloatingActionButton
        android:id="@+id/tabFab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|right"
        android:layout_margin="16dp"
        android:src="@mipmap/ic_add_white"/>
</android.support.design.widget.CoordinatorLayout>

public class TabRecyclerHolder extends Fragment {

    @Bind(R.id.tabRecyclerHolder) RecyclerView tabRecyclerHolder;
    @Bind(R.id.tabPullRefresh) PullRefreshLayout tabPullRefresh;
    @Bind(R.id.tabFab) FloatingActionButton recyclerFab;

    private String tabTitle = "Title";


    public TabRecyclerHolder(){}

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.tab_recycler_holder, container, false);

        ButterKnife.bind(this, rootView);

        recyclerFab.hide(false);

        tabPullRefresh.setRefreshStyle(PullRefreshLayout.STYLE_MATERIAL);

        return rootView;
    }

    public RecyclerView getTabRecyclerHolder() {
        return this.tabRecyclerHolder;
    }

    public FloatingActionButton getRecyclerFab() {
        return this.recyclerFab;
    }

    public String getTabTitle() {
        return this.tabTitle;
    }

    public void setTabTitle(String title) {
        this.tabTitle = title;
    }

    public PullRefreshLayout getTabPullRefresh() {
        return this.tabPullRefresh;
    }
}

Mi adaptador de pestañas

public class TabPagerAdapter extends FragmentStatePagerAdapter {

    private CGController controller;
    private List<Object> items;

    public TabPagerAdapter(FragmentManager fm, CGController controller, List<Object> items) {
        super(fm);
        this.controller = controller;
        this.items = items;
    }

    @Override
    public int getCount() {
        return items.size();
    }

    @Override
    public Fragment getItem(int num) {
        return (TabRecyclerHolder)items.get(num);
    }

    @Override
    public String getPageTitle(int num){
        return ((TabRecyclerHolder)items.get(num)).getTabTitle();
    }
}

El código de procesamiento

public void viewInbox() {
    /** Set up the views */
    receivedHolder = new TabRecyclerHolder();
    receivedHolder.setTabTitle(Constants.TAB_INBOX_RECEIVED);
    sentHolder = new TabRecyclerHolder();
    sentHolder.setTabTitle(Constants.TAB_INBOX_SENT);

    tabs.add(receivedHolder);
    tabs.add(sentHolder);

    /** Set up the tabs */
    final ViewPager inboxViewPager = inboxFragment.getInboxViewPager();
    TabLayout inboxTabLayout = inboxFragment.getInboxTabLayout();

    /** Set the adapter for the view pager */
    inboxViewPager.setAdapter(new TabPagerAdapter(inboxFragment.getChildFragmentManager(), controller, tabs));
    /** set up the tab look and feel */
    inboxTabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
    inboxTabLayout.setTabMode(TabLayout.MODE_FIXED);

    inboxViewPager.setOffscreenPageLimit(3);
    inboxViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(inboxTabLayout));
    inboxTabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            inboxViewPager.setCurrentItem(tab.getPosition());
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    });

    /** And, display! */
    inboxTabLayout.setupWithViewPager(inboxViewPager);

    receivedAdapter = new RecyclerListAdapter(controller, items);
    final RecyclerView receivedList = receivedHolder.getTabRecyclerHolder();
    receivedList.setLayoutManager(new LinearLayoutManager(controller.getContext()));
    receivedList.setAdapter(receivedAdapter);
}

Hay algún código que me he perdido, pero no es pertinente a la pregunta. El código funciona perfectamente cuando inicialmente se ve el fragmento. Sin embargo, dado que mi aplicación contiene una sola actividad y solo reemplaza una vista de contenido para cada fragmento al que se navega, cada fragmento se agrega a la pila posterior y luego aparece cuando se presiona el botón Atrás. Mi problema es que al navegar de regreso a este fragmento, la vista dentro de la pestaña no se está inflando, lo que significa que no se puede acceder a ningún elemento (y, por lo tanto, la aplicación falla al intentar mostrar los datos en la vista del reciclador, etc.).

He echado un vistazo a esta pregunta: TabLayout ViewPager no se carga cuando uso Backstack e implementé su sugerencia (usando getChildFragmentManager() al configurar el adaptador de pager) sin embargo eso no ha solucionado mi problema.

¡Ayuda sería apreciada!

Answer 1

Cambiar esta public View onCreateView(LayoutInflater inflater,... a public void onViewCreated (View view, Bundle savedInstanceState)

entonces vas a tener algo como esto

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {        
    return inflater.inflate(R.layout.tab_recycler_holder, container, false);
}

entonces

@Override
public void onViewCreated (View view, Bundle savedInstanceState){
     ButterKnife.bind(this, view);
    recyclerFab.hide(false);
    tabPullRefresh.setRefreshStyle(PullRefreshLayout.STYLE_MATERIAL);
    ...

ver si ayuda