Skizo-ozᴉʞS Skizo-ozᴉʞS - 5 months ago 24
Android Question

FragmentTabHost - No tab known for tag null

Few days ago I implemented

TabHostFramgent
in a
Fragment
with a
NavigationDrawer
, and I faced with a problem that is the following error :


java.lang.IllegalStateException: No tab known for tag null


The thing is that all works perfectly since my first item list of my
NavigationDrawer
is my
TabHostFragment
, so it works perfect, but the problem is when I go in example to the second item and then I want to go back to the first item, every time that I try so it crashes.

I was searching everywhere, here in
SO
,
code.google.com
, etc... and I still don't get the proper answer.

My
tab_host_test_2.xml
looks like :

<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>


My
activity_main.xml
where I've got my
NavigationDrawer
looks like :

<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>


My
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);




}

}


My
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);
}



}


The full
LogCat
error is :

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)


EDIT

The answer of @Y.S., was kinda different about what I was asking for, but it could be a solution, but it didn't worked fine at all, and the
NavigationDrawer
is under the
TabHostFragment
, etc... I don't want to change anything of my layout.

Answer

As the error suggests

Java : illegal state exception : no tab known for tag null

you tried to initialise TabHost but TabHost was null.


Try the code that I have used to initialise the TabHost and it works fine. Keep you code in onCreateView(). This problem occurs when you try to setup your FragmentTabHost in onViewCreated(), which is called too late. Try to set it up in onCreateView(), and add at least one tab before returning the view Object.

@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;
}

change Layout to:

<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>

Hope it helps.