Fragment is not working properly

Fragment is not working properly

I am using navigation drawer in my app,everything working fine,the issue is onbackpress my app getting close,there is no crash of app,just my app is closing

Following is my code and screen shot ,can anyone help?

MainActivity

@Override      public void onDrawerItemSelected(View view, int position) {          displayView(position);      }        private void displayView(int position) {          Fragment fragment = null;          String title = getString(R.string.app_name);            switch (position) {              case 0:                  fragment = new HomeFragment();                    title = getString(R.string.title_home);                  break;              case 1:                  fragment = new FriendsFragment();                      title = getString(R.string.title_friends);                  break;              case 2:                  fragment = new MessagesFragment();                      title = getString(R.string.title_messages);                  break;                case 3:                  fragment = new Profiles();                      title = getString(R.string.title_pro);                  break;              case 4:                  fragment = new AboutUsFragment();                  title = getString(R.string.title_aboutus);                  break;              case 5:                  fragment = new FAQ();                  title = getString(R.string.title_faq);                  break;              case 6:                  fragment = new Privacypolicy();                  title = getString(R.string.title_privacypolicy);                  break;              case 7:                  fragment = new ContactUs();                  title = getString(R.string.title_contacts);                  break;                case 8:                  // session.logoutUser();                  LoginManager.getInstance().logOut();                 // Intent intent=new Intent(MainActivity.this,LoginPage.class);                  // startActivity(intent);                  title = getString(R.string.title_logout);                  break;              default:                  break;          }            if (fragment != null) {              FragmentManager fragmentManager = getSupportFragmentManager();              FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();              fragmentTransaction.replace(R.id.container_body, fragment);              fragmentTransaction.commit();              getSupportActionBar().setTitle(title);          }      }       /* @Override      public void onBackPressed() {            int count = getFragmentManager().getBackStackEntryCount();            if (count == 0) {              super.onBackPressed();              //additional code          } else {              getFragmentManager().popBackStack();          }        }*/        @Override      public void onBackPressed(){          FragmentManager fm = getSupportFragmentManager();          if (fm.getBackStackEntryCount() > 1) {              Log.i("MainActivity", "popping backstack");              fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);            } else {              Log.i("MainActivity", "nothing on backstack, calling super");              super.onBackPressed();          }      }  }  

HomeFragment.java

public class HomeFragment extends Fragment {        ExpandableListAdapter listAdapter;      ExpandableListView expListView;      List listDataHeader;      HashMap> listDataChild;        private FragmentTabHost tabHost;      private SearchView searchView;      // private String strtext;      // private String FBIDs;      // private String GIDs;          public HomeFragment() {      }        @Override      public View onCreateView(LayoutInflater inflater, ViewGroup container,                               Bundle savedInstanceState) {            tabHost = new FragmentTabHost(getActivity());          tabHost.setup(getActivity(), getChildFragmentManager(), R.layout.my_parent_fragment);          // strtext = getArguments().getString("user_login_id");              //  System.out.println("<<<<<<<<<<<<<< Session ID :  " + strtext);            Bundle arg1 = new Bundle();          arg1.putInt("Arg for Frag1", 1);         /* if(strtext!=null) {              arg1.putString("user_logid", strtext);          }*/            tabHost.addTab(tabHost.newTabSpec("one").setIndicator(getTabIndicator(tabHost.getContext(), R.drawable.icon_profile_tabs, "Home")), DiscoverFragment.class, arg1);          Bundle arg2 = new Bundle();            arg2.putInt("Arg for Frag2", 2);           /* if(strtext!=null) {              arg2.putString("user_logid_sectab", strtext);          }*/            tabHost.addTab(tabHost.newTabSpec("Sec").                  setIndicator(getTabIndicator(tabHost.getContext(), R.drawable.icon_frnds_tab, "Invite")), ShopFragment.class, arg2);              Bundle arg3 = new Bundle();          arg3.putInt("Arg for Frag3", 3);          /*  if(strtext!=null) {              arg3.putString("user_logid_thirdtab", strtext);          }*/            tabHost.addTab(tabHost.newTabSpec("Third").                  setIndicator(getTabIndicator(tabHost.getContext(), R.drawable.icon_wish_tab, "Wish")), Thirdtab.class, arg3);              Bundle arg4 = new Bundle();          arg4.putInt("Arg for Frag4", 4);          /*if(strtext!=null) {              arg4.putString("user_logid_fourthtab", strtext);          }*/            tabHost.addTab(tabHost.newTabSpec("Four").                  setIndicator(getTabIndicator(tabHost.getContext(), R.drawable.icon_notification_tab, "Alert")), FourthTabs.class, arg4);            return tabHost;          }        @Override      public void onAttach(Activity activity) {          super.onAttach(activity);      }        @Override      public void onDetach() {          super.onDetach();      }        public View getTabIndicator(Context context, int icon, String text) {          View view = LayoutInflater.from(context).inflate(R.layout.tab_layout, null);          ImageView iv = (ImageView) view.findViewById(R.id.indicatorImageView);          iv.setImageResource(icon);          TextView txt = (TextView) view.findViewById(R.id.txttb);          txt.setText(text);          return view;      }      }  

DiscoverFragment.java

public class DiscoverFragment extends Fragment {          private Button btn;        public DiscoverFragment() {      }        @Override      public View onCreateView(LayoutInflater inflater, ViewGroup container,                               Bundle savedInstanceState) {            View rootView = inflater.inflate(R.layout.discover_frag, container, false);            btn=(Button)rootView.findViewById(R.id.btnhomf);            btn.setOnClickListener(new OnClickListener() {              @Override              public void onClick(View v) {                  WishaFriend ff = new WishaFriend();                    android.support.v4.app.FragmentManager fm = getActivity().getSupportFragmentManager();                  android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();                  fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);                 // ft.replace(R.id.container_body,ff);                 ft.replace(((ViewGroup) getView().getParent()).getId(), ff);                    // fm.addToBackStack("sds");                 ft.commit();              }          });            return rootView;      }    }  

when i run app it shows this as first screen

then i click on gotonextfrag button,and it will redirect to next frag and i am getting this screen

now from this fragment if i press backbutton of device my app get close

xml

Answer by datalost for Fragment is not working properly

It's the normal behavior of Activity. When you press back button, it finish the current activity.

Override back button

Answer by Logic for Fragment is not working properly

I think you are not adding to BackStack.

Try this when you want to show a fragment

public void showFragment(Fragment fragment, String title) {      if (fragment != null) {          String backStateName = fragment.getClass().getName();          mFragmentManager = getSupportFragmentManager();          mFragmentTransaction = mFragmentManager.beginTransaction();          mFragmentTransaction.replace(R.id.dashboard_container, fragment);          mFragmentTransaction.addToBackStack(backStateName);          mFragmentTransaction.commit();          setActionBarTitle(title);          if (backStateName == DashBoardFragment.class.getSimpleName()) {              clearBackStack();          }      }  }  

and in onBackPressed()

@Override  public void onBackPressed() {      if (mDrawerLayout.isDrawerOpen(Gravity.LEFT)) {          mDrawerLayout.closeDrawers();      } else {          int backStackCount = mFragmentManager.getBackStackEntryCount();          if (backStackCount > 0) {              popFragments(backStackCount);          } else {              finish();          }      }  }    private void popFragments(int backStackCount) {      String fragmentTag = mFragmentManager.getBackStackEntryAt(              backStackCount - 1).getName();      if (!TextUtils.isEmpty(fragmentTag)) {          Fragment currentFragment = mFragmentManager                  .findFragmentById(R.id.dashboard_container);          if (currentFragment != null && currentFragment instanceof HomeFragment) {              finish();          } else {              mFragmentManager.popBackStack();          }      }  }    private void clearBackStack() {      mFragmentManager.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);      setSelectedItem(Numerics.ZERO);  }  

Answer by Pitty for Fragment is not working properly

Add this to your fragmentTransaction.

fragmentTransaction.addToBackStack(null);  

Answer by Pramod Waghmare for Fragment is not working properly

Try this in your code,

  FragmentManager fragmentManager = getSupportFragmentManager();    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();    fragmentTransaction.replace(R.id.container_body, fragment);    fragmentTransaction.addToBackStack("messages"); /** Add this line**/    fragmentTransaction.commit();  

this will add the fragment in your backstack which is not happening in your case.

In your onBackPressed

 @Override      public void onBackPressed() {          // if drawer is open          if (drawer.isDrawerOpen(GravityCompat.START)) {              drawer.closeDrawer(GravityCompat.START);          } else {              super.onBackPressed();              if(fragmentManager.getBackStackEntryCount() == 0)                  Log.d(TAG,"count = 0 "); /** add alert to exit app **/              else                  Log.d(TAG,"count != 0 ");          }      }  

Answer by kevz for Fragment is not working properly

1. Add Fragment as below -

   getSupportFragmentManager().beginTransaction()          .replace(R.id.myFrame, new FirstFrag(), null)          .addToBackStack(null)          .commit();  

2. Change your onBackPressed() mth as below

   @Override  public void onBackPressed(){      FragmentManager fm = getSupportFragmentManager();        if (fm.getBackStackEntryCount() > 1) {          fm.popBackStack();        } else {          super.onBackPressed();      }  }  

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