FragmentTabHost – No se conoce ninguna pestaña null

Hace unos días implementé TabHostFramgent en un Fragment con un NavigationDrawer , y me enfrenté a un problema que es el siguiente error:

Java.lang.IllegalStateException: No se conoce ninguna pestaña null

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La cosa es que todo funciona perfectamente desde mi primera lista de artículos de mi NavigationDrawer es mi TabHostFragment , por lo que funciona perfecto, pero el problema es cuando voy en el ejemplo al segundo elemento y luego quiero volver al primer elemento, cada Tiempo que lo intento por lo que se bloquea.

code.google.com todas partes, aquí en SO , code.google.com , etc … y todavía no consigo la respuesta apropiada.

Mi tab_host_test_2.xml parece a:

  <android.support.v4.app.FragmentTabHost xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@android:id/tabhost" android:layout_width="match_parent" android:layout_height="match_parent" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TabWidget android:id="@android:id/tabs" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" /> <FrameLayout android:id="@android:id/tabcontent" android:layout_width="0dp" android:layout_height="0dp" android:layout_weight="0" /> <FrameLayout android:id="@+id/realtabcontent" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" /> </LinearLayout> </android.support.v4.app.FragmentTabHost> 

Mi activity_main.xml en el que tengo mi NavigationDrawer tiene el siguiente aspecto:

  <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent"> <!-- Framelayout to display Fragments --> <FrameLayout android:id="@+id/frame_container" android:layout_width="match_parent" android:layout_height="match_parent" /> <!-- Listview to display slider menu --> <ListView android:id="@+id/list_slidermenu" android:layout_width="240dp" android:layout_height="match_parent" android:layout_gravity="start" android:choiceMode="singleChoice" android:divider="@color/list_divider" android:dividerHeight="1dp" android:listSelector="@drawable/list_selector" android:background="@color/list_background"/> </android.support.v4.widget.DrawerLayout> 

Mi TabHostFragment.java :

  public class TabHostFragment extends Fragment { public TabHostFragment(){ } private FragmentTabHost mTabHost; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.tab_host_test2, container, false); return rootView; } @Override public void onViewCreated(View view, Bundle savedInstanceState) { mTabHost = (FragmentTabHost)view.findViewById(android.R.id.tabhost); mTabHost.setup(getActivity(), getChildFragmentManager(), R.id.realtabcontent); mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator("Tab1"), MisOfertasFragment.class, null); mTabHost.addTab(mTabHost.newTabSpec("tab2").setIndicator("Tab2"), RecomendacionesFragment.class, null); } } 

Mi ActivityMain.java :

 public class MainActivity extends FragmentActivity { private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; // saber si esta abierto public boolean mDrawerOpened; // nav drawer title private CharSequence mDrawerTitle; private FragmentTabHost mTabHost; // used to store app title private CharSequence mTitle; //para ponerlo visible public MenuItem mi; // slide menu items private String[] navMenuTitles; private TypedArray navMenuIcons; private ArrayList<NavDrawerItem> navDrawerItems; private NavDrawerListAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTitle = mDrawerTitle = getTitle(); // load slide menu items navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items); // nav drawer icons from resources navMenuIcons = getResources() .obtainTypedArray(R.array.nav_drawer_icons); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.list_slidermenu); navDrawerItems = new ArrayList<NavDrawerItem>(); // adding nav drawer items to array // Home navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1))); // Find People navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1))); // Photos navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1))); // Communities, Will add a counter here navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1))); // Pages navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1))); // What's hot, We will add a counter here navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1))); //AyudaSugerencias navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1))); navDrawerItems.add(new NavDrawerItem(navMenuTitles[7], navMenuIcons.getResourceId(7, -1))); // Recycle the typed array navMenuIcons.recycle(); mDrawerList.setOnItemClickListener(new SlideMenuClickListener()); // setting the nav drawer list adapter adapter = new NavDrawerListAdapter(getApplicationContext(), navDrawerItems); mDrawerList.setAdapter(adapter); // enabling action bar app icon and behaving it as toggle button getActionBar().setDisplayHomeAsUpEnabled(true); getActionBar().setBackgroundDrawable(new ColorDrawable(0xff1d97dd)); getActionBar().setHomeButtonEnabled(true); mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.drawable.ic_drawer, //nav menu toggle icon R.string.app_name, // nav drawer open - description for accessibility R.string.app_name // nav drawer close - description for accessibility ) { public void onDrawerClosed(View view) { getActionBar().setTitle( Html.fromHtml("<font color='ffffff'>" + mTitle + "</font>")); // calling onPrepareOptionsMenu() to show action bar icons invalidateOptionsMenu(); mDrawerOpened = false; syncState(); } public void onDrawerOpened(View drawerView) { getActionBar().setTitle( Html.fromHtml("<font color='ffffff'>" + mDrawerTitle + "</font>")); // calling onPrepareOptionsMenu() to hide action bar icons invalidateOptionsMenu(); mDrawerOpened = true; syncState(); } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { // on first time display view for first nav item displayView(0); } } /** * Slide menu item click listener */ private class SlideMenuClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // display view for selected nav drawer item displayView(position); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { Fragment fragment = null; // toggle nav drawer on selecting action bar app icon/title if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } // Handle action bar actions click switch (item.getItemId()) { case R.id.action_settings: return true; case R.id.ofertasRefresh: return true; case R.id.menu_search: return true; case R.id.newOffer: getFragmentManager().beginTransaction().replace(R.id.frame_container, new TipusNouProducte()).commit(); return true; default: return super.onOptionsItemSelected(item); } } /* * * Called when invalidateOptionsMenu() is triggered */ @Override public boolean onPrepareOptionsMenu(Menu menu) { // if nav drawer is opened, hide the action items boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList); menu.findItem(R.id.action_settings).setVisible(!drawerOpen); if (mDrawerOpened) { menu.removeItem(R.id.ofertasRefresh); menu.removeItem(R.id.menu_search); menu.removeItem(R.id.newOffer); } if (!mDrawerOpened) { menu.add(Menu.NONE, R.id.ofertasRefresh, Menu.NONE, mTitle); } return super.onPrepareOptionsMenu(menu); } /** * Diplaying fragment view for selected nav drawer list item */ private void displayView(int position) { mDrawerList.setItemChecked(position, true); mDrawerList.setSelection(position); setTitle(navMenuTitles[position]); mDrawerLayout.closeDrawer(mDrawerList); Fragment fragment = null; switch (position) { case 0: fragment = new TabHostFragment(); break; case 1: fragment = new RecomendacionesFragment(); break; case 2: fragment = new LocalizacionFragment(); break; case 3: fragment = new ListaProductosFragment(); break; case 4: fragment = new ConfiguracionFragment(); break; case 5: fragment = new AyudaSugerenciasFragment(); break; case 6: fragment = new AyudaSugerencias(); break; default: break; } if (fragment != null) { FragmentManager fragmentManager = getSupportFragmentManager(); fragmentManager.beginTransaction() .replace(R.id.frame_container, fragment).commit(); /// here says that replace android.app.Fragment in FragmentTransaction cannot be applied... // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); mDrawerList.setSelection(position); setTitle(navMenuTitles[position]); mDrawerLayout.closeDrawer(mDrawerList); } else { // error in creating fragment Log.e("MainActivity", "Error in creating fragment"); } } @Override public void setTitle(CharSequence title) { mTitle = title; getActionBar().setTitle(mTitle); } /** * When using the ActionBarDrawerToggle, you must call it during * onPostCreate() and onConfigurationChanged()... */ @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggls mDrawerToggle.onConfigurationChanged(newConfig); } } 

El error completo de LogCat es:

  03-04 16:53:05.708 2232-2232/info.androidhive.slidingmenu E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: info.androidhive.slidingmenu, PID: 2232 java.lang.IllegalStateException: No tab known for tag null at android.support.v4.app.FragmentTabHost.doTabChanged(FragmentTabHost.java:330) at android.support.v4.app.FragmentTabHost.onAttachedToWindow(FragmentTabHost.java:280) at android.view.View.dispatchAttachedToWindow(View.java:13406) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2707) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2714) at android.view.ViewGroup.addViewInner(ViewGroup.java:3919) at android.view.ViewGroup.addView(ViewGroup.java:3733) at android.view.ViewGroup.addView(ViewGroup.java:3678) at android.view.ViewGroup.addView(ViewGroup.java:3654) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:958) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:454) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5221) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) 

EDITAR

La respuesta de @YS , era algo diferente acerca de lo que estaba pidiendo, pero podría ser una solución, pero no funcionó bien en absoluto, y el NavigationDrawer está bajo el TabHostFragment , etc … No quiero Para cambiar cualquier cosa de mi diseño.

 @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { // Create FragmentTabHost mTabHost = new FragmentTabHost(getActivity()); // Locate fragment1.xml to create FragmentTabHost mTabHost.setup(getActivity(), getChildFragmentManager(), R.layout.fragment1); mTabHost.addTab(mTabHost.newTabSpec("groups").setIndicator("",getResources().getDrawable(R.drawable.tab_group_icon)),FragmentTab1.class, null); mTabHost.addTab(mTabHost.newTabSpec("contacts").setIndicator("",getResources().getDrawable(R.drawable.tab_user_icon)),FragmentTab2.class, null); MainActivity.fabButton.setVisibility(View.VISIBLE); return mTabHost; } 

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <FrameLayout android:layout_width="match_parent" android:layout_height="0dip" android:layout_weight="1" /> <android.support.v4.app.FragmentTabHost android:id="@android:id/tabhost" android:layout_width="match_parent" android:layout_height="wrap_content" > <FrameLayout android:id="@android:id/tabcontent" android:layout_width="0dp" android:layout_height="0dp" android:layout_weight="0" /> </android.support.v4.app.FragmentTabHost> </LinearLayout> 

 public class TabHostFragment extends Fragment implements ActionBar.TabListener{ public TabHostFragment(){ } AppSectionsPagerAdapter mAppSectionsPagerAdapter; ViewPager mViewPager; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.tab_host_test2, container, false); return rootView; } @Override public void onViewCreated(View view, Bundle savedInstanceState){ mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getChildFragmentManager()); final ActionBar actionBar = ((FragmentActivity)getActivity()).getSupportActionBar(); actionBar.setHomeButtonEnabled(false); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); mViewPager = (ViewPager) view.findViewById(R.id.pager); mViewPager.setAdapter(mAppSectionsPagerAdapter); mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { actionBar.setSelectedNavigationItem(position); } }); for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) { actionBar.addTab( actionBar.newTab() .setText(mAppSectionsPagerAdapter.getPageTitle(i)) .setTabListener(this)); } } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { mViewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } public static class AppSectionsPagerAdapter extends FragmentPagerAdapter { public AppSectionsPagerAdapter(FragmentManager fm) { super(fm); } @Override public Fragment getItem(int i) { Fragment f = null; switch (i) { case 0: f = new MisOfertasFragment(); break; case 1: f = new RecomendacionesFragment(); break; } return f; } @Override public int getCount() { return 2; } @Override public CharSequence getPageTitle(int position) { return getFragmentTitle(position); } private String getFragmentTitle(int position){ if(position == 0) return "Tab 1"; else if(position == 1) return "Tab 2"; else return ""; } } } 

 <android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="match_parent" /> 

 if(position != 0) getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD); 

  <com.my.TabHostFragment android:id="@+id/fragmentId" android:layout_width="match_parent" android:layout_height="match_parent" />