I am implementing a ViewPager using FragmentStatePagerAdapter. The code samples are below.
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
Log.d("--GetItem", "---");
switch (position) {
case 0:
return ScreenSlidePageFragment.newInstance(b1);
case 1:
return ScreenSlidePageFragment.newInstance(b2);
case 2:
return ScreenSlidePageFragment.newInstance(b3);
default:
return null;
}
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
Log.d("--InstItem", "--");
return super.instantiateItem(container, position);
}
@Override
public int getCount() {
return NUM_PAGES; //set as 3
}
}
ScreenSlidePageFragment is as follows.
public class ScreenSlidePageFragment extends Fragment implements View.OnClickListener{
Bundle b;
public ScreenSlidePageFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
Log.d("----onCreateFrgmnt--", "11");
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d("----onCreateViewFrgmnt-", "11");
ViewGroup rootView = (ViewGroup) inflater.inflate(
R.layout.fragment_screen_slide_page, container, false);
return rootView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Log.d("----onViewCreatedFrgmnt", "11");
b = getArguments();
TextView tv_city = (TextView) view.findViewById(R.id.city_field);
TextView tv_update = (TextView) view.findViewById(R.id.updated_field);
TextView tv_day = (TextView) view.findViewById(R.id.day);
tv_day.setText("DAY " + String.valueOf(b.getInt("day")));
tv_city.setText(b.getString("city"));
tv_update.setText("Last update on : " + b.getString("date"));
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
public static ScreenSlidePageFragment newInstance(Bundle myBundle) {
ScreenSlidePageFragment f = new ScreenSlidePageFragment();
f.setArguments(myBundle);
return f;
}
}
In the MainActivity, I am trying to handle the orientation change. I use the following piece of code.
if (savedInstanceState != null) {
setContentView(R.layout.activity_main);
myViewPager = (MyCustomViewPager) findViewById(R.id.pager);
b1 = savedInstanceState.getBundle("Fragment1");
b2 = savedInstanceState.getBundle("Fragment2");
b3 = savedInstanceState.getBundle("Fragment3");
myViewPager.setOffscreenPageLimit(NUM_PAGES - 1);
myPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
myViewPager.setAdapter(myPagerAdapter);
}
The fragments are recreated on orientation change. onCreateView as well as onViewCreated are being called (checked LogCat). The problem arises when I try to update the view in the fragments. For the update I am using following code:
FragmentStatePagerAdapter adapter = (FragmentStatePagerAdapter) myViewPager.getAdapter();
ScreenSlidePageFragment fragment1 = (ScreenSlidePageFragment) adapter.instantiateItem(myViewPager, 0);
ScreenSlidePageFragment fragment2 = (ScreenSlidePageFragment) adapter.instantiateItem(myViewPager, 1);
ScreenSlidePageFragment fragment3 = (ScreenSlidePageFragment) adapter.instantiateItem(myViewPager, 2);
But when I call fragment1.getView(), it is returning null. However, the same code runs well when I don't change the orientation.
How can I get the fragment views on orientation change? I checked some of the solutions posted where they say to save the fragments in array, but those are not working for me. Are the codes I have put, not able to do the task? Thank you.
