I tried in several platforms, but couldn't get an answer.
Please note, the App below uses Googles SlidingTabLayout
<https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjCsfjZ7Z_RAhWCKJQKHUznC9kQFggZMAA&url=https%3A%2F%2Fdeveloper.android.com%2Fsamples%2FSlidingTabsBasic%2Fsrc%2Fcom.example.android.common%2Fview%2FSlidingTabLayout.html&usg=AFQjCNE2Ra2Qi2iZSYuL7so1Vb871F-4UQ&sig2=tFX-AQgNaVLM3Inyj6-Mzg&bvm=bv.142059868,d.dGo>
.
Fragment1 is a simple fragment with one textview. Fragment2 contains a
viewpager where I load a separate fragment "FragmentViewPager" via
FragmentStatePagerAdapter.
In the below example, at any point I click Button1, the `FrameLayout`
(defined in the MainActivity Layout) should replace `Fragment2` (if exists)
with `Fragment1`. Therefore, FragmentViewPager should also be destroyed
along with `Fragment2`. However that does not happen, as when I change the
orientation of my device (after clicking Button1), I still get the Toast
which is defined in the `onCreate()` method of `FragmentViewPager`.
Why `FragmentViewPager`'s onCreate method is called even if `Fragment2` is
paused/destroyed? Is it possible that, the Toast of `FragmentViewPager`
will not be shown when `Fragment2` is destroyed?
*MainActivity*
package com.abdfahim.testproject;
import android.app.Fragment;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(onClickListener);
Button button2 = (Button) findViewById(R.id.button2);
button2.setOnClickListener(onClickListener);
}
private View.OnClickListener onClickListener = new View.
OnClickListener() {
@Override
public void onClick(View v) {
Fragment fragment;
switch (v.getId()){
case R.id.button1:
fragment = new Fragment1();
break;
case R.id.button2:
fragment = new Fragment2();
break;
default:
return;
}
getFragmentManager().beginTransaction().replace(R.id.
frame_container, fragment, v.getTag().toString()).addToBackStack(null).
commit();
}
};
}
*Fragment1*
package com.abdfahim.testproject;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment1 extends Fragment {
public Fragment1(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup
container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment1,container,
false);
setHasOptionsMenu(true);
return rootView;
}
}
*Fragment2*
package com.abdfahim.testproject;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment2 extends Fragment {
public Fragment2(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup
container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment2,container,
false);
setHasOptionsMenu(true);
CharSequence titles[]= {"Tab A", "Tab B"};
// Creating The ViewPagerAdapter
ViewPagerAdapter adapter = new ViewPagerAdapter(getActivity().
getFragmentManager(), titles, titles.length);
ViewPager pager = (ViewPager) rootView.findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assigning the Sliding Tab Layout View
SlidingTabLayout tabs = (SlidingTabLayout) rootView.findViewById
(R.id.tabs);
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
return rootView;
}
static class ViewPagerAdapter extends FragmentStatePagerAdapter {
private CharSequence titles[];
private int numbOfTabs;
public ViewPagerAdapter(FragmentManager fm, CharSequence mTitles
[], int mNumbOfTabs) {
super(fm);
this.titles = mTitles;
this.numbOfTabs = mNumbOfTabs;
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public Fragment getItem(int position) {
Bundle bundle = new Bundle();
bundle.putString("displayText", "Inside Fragment 2, " +
titles[position]);
FragmentViewPager fragment = new FragmentViewPager();
fragment.setArguments(bundle);
return fragment;
}
// This method return the titles for the Tabs in the Tab Strip
@Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
// This method return the Number of tabs for the tabs Strip
@Override
public int getCount() {
return numbOfTabs;
}
}
}
*FragmentViewPager*
package com.abdfahim.testproject;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
public class FragmentViewPager extends Fragment {
public FragmentViewPager(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup
container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_view_pager,
container,false);
setHasOptionsMenu(true);
Bundle bundle = this.getArguments();
TextView textView = (TextView) rootView.findViewById(R.id.
tabText);
textView.setText(bundle.getString("displayText"));
return rootView;
}
@Override
public void onStart() {
super.onStart();
Toast.makeText(getActivity(), "This is View Pager Fragment",
Toast.LENGTH_SHORT).show();
}
}
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