I am stuck in solving this problem. I have set tabs in fragment using TabLayout and ViewPager. The problem is when i move to next fragment and then i press back button i get empty tabs view.
Here I am attaching my code:
home.xml
<?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:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:id="@+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:tabIndicatorColor="@android:color/white"
app:tabIndicatorHeight="4dp" />
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent" />
</LinearLayout>`
home.java(fragment)
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.home, container, false);
((Drawer) getActivity()).setActionBarTitle("Home");
Toast.makeText(getActivity(), "entry count" + getActivity().getSupportFragmentManager().getBackStackEntryCount(), Toast.LENGTH_SHORT).show();
tabLayout = (TabLayout) view.findViewById(R.id.tabLayout);
tabLayout.addTab(tabLayout.newTab().setText("Products"));
tabLayout.addTab(tabLayout.newTab().setText("Category"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
viewPager = (ViewPager) view.findViewById(R.id.pager);
Pager adapter = new Pager(getActivity().getSupportFragmentManager(), tabLayout.getTabCount());
tabLayout.getTabCount());
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(this);
return view;
}
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
pager.java (Adapter)
public class Pager extends FragmentStatePagerAdapter {
int tabCount;
public Pager(FragmentManager fm, int tabCount) {
super(fm);
this.tabCount = tabCount;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
Product tab1 = new Product();
return tab1;
case 1:
Category tab2 = new Category();
return tab2;
default:
return null;
}
}
@Override
public int getCount() {
return tabCount;
}
}
MainActivity (where I set this tab fragment)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawer);
getSupportActionBar().setTitle("Home");
fragment = new home();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.main, fragment);
ft.commit();