Android Scheda Layout all'interno Frammento non caricare contenuti scheda

Question

ho Main Activity con navigation drawer e container, navigation drawer ha l'elenco di opzioni molto opzione cassetto sostituisce container con fragments. container carichi tab layout fragment quando faccio clic sull'opzione fragtab, ma quando provo a caricarlo una seconda volta facendo clic sulle stesse opzioni, non viene visualizzato il contenuto tab.

disposizione frammento XML

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:layout_width="match_parent" 
android:layout_height="match_parent"> 

<android.support.design.widget.CoordinatorLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <android.support.design.widget.AppBarLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> 

     <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
      android:id="@+id/card_search" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_margin="5dp" 
      card_view:cardBackgroundColor="@android:color/white" 
      card_view:cardCornerRadius="2dp"> 


      <RelativeLayout 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 


       <LinearLayout 
        android:id="@+id/linearLayout_search" 
        android:layout_width="match_parent" 
        android:layout_height="48dp"> 


        <ImageView 
         android:id="@+id/image_search_back" 
         android:layout_width="48dp" 
         android:layout_height="48dp" 
         android:background="?android:attr/selectableItemBackground" 
         android:clickable="true" 

         android:padding="12dp" 
         android:src="@mipmap/ic_search_black_24dp" /> 


        <EditText 
         android:id="@+id/edit_text_search" 
         android:layout_width="0dp" 
         android:layout_height="match_parent" 
         android:layout_weight="1" 
         android:background="#fff" 
         android:gravity="center_vertical" 
         android:hint="Search" 
         android:imeOptions="actionSearch" 
         android:inputType="textCapWords" 
         android:paddingLeft="12dp" 
         android:paddingRight="8dp" 
         android:singleLine="true" 
         android:textColor="@color/colorAccent" 
         android:textColorHint="@color/colorAccent" /> 

       </LinearLayout> 

      </RelativeLayout> 
     </android.support.v7.widget.CardView> 


     <android.support.design.widget.TabLayout 
      android:id="@+id/tabs" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="@color/colorPrimary" 
      app:tabGravity="fill" 
      app:tabIndicatorColor="@android:color/white" 
      app:tabMode="fixed" 
      app:tabSelectedTextColor="#F4F1F1" 
      app:tabTextColor="@android:color/white" /> 

    </android.support.design.widget.AppBarLayout> 

    <android.support.v4.view.ViewPager 
     android:id="@+id/viewpager" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

</android.support.design.widget.CoordinatorLayout> 

<android.support.design.widget.FloatingActionButton 
    android:id="@+id/fab" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentBottom="true" 
    android:layout_alignParentRight="true" 
    android:layout_margin="@dimen/fab_margin" 
    android:src="@drawable/add_icon_white" /> 

classe Frammento FragTabs.java

public class FragTabs extends Fragment { 


public FragTabs() { 
    // Required empty public constructor 
} 

private Toolbar toolbar; 
private TabLayout tabLayout; 
private ViewPager viewPager; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View view = inflater.inflate(R.layout.fragment_frag_tabs, container, false); 
    viewPager = (ViewPager) view.findViewById(R.id.viewpager); 
    setupViewPager(viewPager); 

    tabLayout = (TabLayout) view.findViewById(R.id.tabs); 
    //tabLayout.setupWithViewPager(viewPager); 

    tabLayout.post(new Runnable() { 
     @Override 
     public void run() { 
      tabLayout.setupWithViewPager(viewPager); 
     } 
    }); 

    FloatingActionButton fab = (FloatingActionButton) view.findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      if (viewPager.getCurrentItem() == 0) { 
       getFragmentManager().beginTransaction().replace(R.id.profile_container, new Addplaymates()).commit(); 
      } else { 
       getFragmentManager().beginTransaction().replace(R.id.profile_container, new Addplaygroups()).commit(); 
      } 
     } 
    }); 
    return view; 
} 

private void setupViewPager(ViewPager viewPager) { 
    ViewPagerAdapter adapter = new ViewPagerAdapter(getFragmentManager()); 

    viewPager.setAdapter(adapter); 
} 

class ViewPagerAdapter extends FragmentPagerAdapter { 

    CharSequence Titles[] = {"Frag A", "Frag B"}; 

    public ViewPagerAdapter(FragmentManager manager) { 
     super(manager); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     Fragment f = null; 
     switch (position) { 
      case 0: 
       FragA tab1 = new FragA(); 
       f = tab1; 
       break; 
      case 1: 
       FragB tab2 = new FragB(); 
       f = tab2; 
       break; 
     } 
     return f; 
    } 

    @Override 
    public int getCount() { 
     return 2; 
    } 

    /*public void addFragment(Fragment fragment, String title) { 
     mFragmentList.add(fragment); 
     mFragmentTitleList.add(title); 
    }*/ 

    @Override 
    public CharSequence getPageTitle(int position) { 
     return Titles[position]; 
    } 
}} 

attività principale xml

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/drawer_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <RelativeLayout 
     android:id="@+id/conta" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 

     <include 
      android:id="@+id/app_bar" 
      layout="@layout/app_bar" /> 

     <FrameLayout 
      android:id="@+id/profile_container" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:layout_below="@+id/app_bar" /> 

    </RelativeLayout> 

    <fragment 
     android:id="@+id/navigation_drawer" 
     android:name="com.kshediv.playforever.Profile.NaviagtionFragment" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     app:layout="@layout/fragment_naviagtion" 
     tools:layout="@layout/fragment_naviagtion" /> 
</android.support.v4.widget.DrawerLayout> 

cassetto di navigazione.

public class NaviagtionFragment extends Fragment { 


public NaviagtionFragment() { 
    // Required empty public constructor 
} 

private ActionBarDrawerToggle mDrawerToggle; 
private DrawerLayout mDrawerLayout; 

public void setUp(DrawerLayout dl, Toolbar toolbar) { 
    mDrawerLayout = dl; 
    mDrawerToggle = new ActionBarDrawerToggle(getActivity(), dl, toolbar, R.string.DrawerOpn, R.string.DrawerClose) { 
     @Override 
     public void onDrawerOpened(View drawerView) { 
      super.onDrawerOpened(drawerView); 
      getActivity().invalidateOptionsMenu(); 
     } 

     @Override 
     public void onDrawerClosed(View drawerView) { 
      super.onDrawerClosed(drawerView); 
      getActivity().invalidateOptionsMenu(); 
     } 
    }; 
    mDrawerLayout.setDrawerListener(mDrawerToggle); 
    mDrawerLayout.post(new Runnable() { 
     @Override 
     public void run() { 
      mDrawerToggle.syncState(); 
     } 
    }); 
} 


@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View view = inflater.inflate(R.layout.fragment_naviagtion, container, false); 

    FrameLayout home = (FrameLayout) view.findViewById(R.id.home); 
    home.setOnClickListener(onClickListener); 

    FrameLayout fragtabs = (FrameLayout) view.findViewById(R.id.fragtabs); 
    playmates.setOnClickListener(onClickListener); 

    FrameLayout settings = (FrameLayout) view.findViewById(R.id.settings); 
    playmates.setOnClickListener(onClickListener); 

    return view; 
} 

public View.OnClickListener onClickListener = new View.OnClickListener() { 
    @Override 
    public void onClick(View v) { 
     switch (v.getId()) { 
      case R.id.home: 
       getFragmentManager().beginTransaction().replace(R.id.profile_container, new Home()).commit(); 
       mDrawerLayout.closeDrawers(); 
       break; 
      case R.id.playmates: 
       getFragmentManager().beginTransaction().replace(R.id.profile_container, new PlayTabs()).commit(); 
       mDrawerLayout.closeDrawers(); 
       break; 
      case R.id.performance: 
       getFragmentManager().beginTransaction().replace(R.id.profile_container, new Settings()).commit(); 
       mDrawerLayout.closeDrawers(); 
       break; 
     } 
    } 
};} 

Main Activity

public class MainActivity extends AppCompatActivity{ 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_profile); 
    Toolbar toolBar = (Toolbar) findViewById(R.id.app_bar); 
    setSupportActionBar(toolBar); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
    NaviagtionFragment nav_frg = (NaviagtionFragment) getSupportFragmentManager().findFragmentById(R.id.navigation_drawer); 
    nav_frg.setUp((DrawerLayout) findViewById(R.id.drawer_layout), toolBar); 

} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_profile, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
}} 

Grazie,

Answer 1

Provare a utilizzare

class ViewPagerAdapter extends FragmentStatePagerAdapter { 
... 
} 

invece di

class ViewPagerAdapter extends FragmentPagerAdapter { 
... 
}