Question

MainActivity.java

FragmentA fragmentA = null;
FragmentB fragmentB = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_activity);

}

public void replaceFragment(Fragment newFragment){
    FragmentTransaction ft = getFragmentManager().beginTransaction();
    ft.replace(R.id.right_container, newFragment);
    ft.addToBackStack(null);
    ft.commit();
}

public void removeFromActivity(Fragment oldFrag){
    FragmentManager manager = getFragmentManager();
    FragmentTransaction ft = manager.beginTransaction();
    manager.popBackStack();
    manager.executePendingTransactions();
    ft.remove(oldFrag);
    ft.commit();
}

FragmentA.java

public class FragmentA extends Fragment implements OnClickListener{

public View contentView;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    if(null == contentView){
        contentView = inflater.inflate(R.layout.fragment_a, null);
        EditText editTxt = (EditText) contentView.findViewById(R.id.right_frag_edit_txt);
        editTxt.setOnClickListener(this);
    }
     //--------------------------------------------------//
     //Here If I am printing
     EditText editTxt = (EditText) contentView.findViewById(R.id.right_frag_edit_txt);
     System.out.println(editTxt.getText()); //Output -- Now Button has Clicked --New value as expected
    return contentView;
}

public void setValues(String newVal){
    EditText editTxt = (EditText) contentView.findViewById(R.id.right_frag_edit_txt);
    editTxt.setText(newVal);
}

@Override
public void onClick(View v) {
    FragmentB newFrag = new FragmentB();
    ((MainActivity)getActivity()).fragmentB = newFrag;
    ((MainActivity)getActivity()).replaceFragment(newFrag);
}
}

FragmentB.java

public class ReplacedFragment extends Fragment implements OnItemClickListener{

public View contentView;

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    if(null == contentView){
        contentView = inflater.inflate(R.layout.fragment_b, null);
    }
    return contentView;
}

@Override
public void onClick(View v) {
    FragmentA previousFrag = ((MainActivity)getActivity()).fragmentA;
    previousFrag.setValues("Now Button has Clicked");
    ((MainActivity)getActivity()).removeFromActivity(this);
}
}

From fragmentB when I am clicking a button “Back”, I am simply removing this fragment from back stack. As a result FragmentB resumes back. But the edittext value is not updating with new value.

What should I do to update some view of FragmentA when it is resuming back. Please help.

Answer 1

Finally I found a solution, but I don’t know whether its an efficient solution or not. but still I am sharing it.

While starting FragmentB from fragmentA, it will call onPause() of FragmentA where I have set a flag to true. And when FragmentB is removed from FragmentTransaction, it will call to onResume() of FragmentA where I am checking the flag value and updating the FragmentA.

I think this is a better solution, instead of calling lifecycle method onPause() explicitly.