Multi tool use

how to update listview on backpressed in nested fragment?

This is my Fragment where I have a list view and I am populating it with ChapterListAdapter.

Curriculum Fragment

public class CurriculumFragment extends Fragment implements
ResponseDelegate {
Context contextd;
ListView curriculumList;
FragmentActivity mActivity;
boolean onResult=false;
int requestCode, resultCode;
Intent data;
String courseId;
private RequestedServiceDataModel requestedServiceDataModel;
private ArrayList<ChapterItem> courses = new ArrayList<>();
private ChaptersListAdapter adapter;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
contextd = container.getContext();
View rootView = inflater.inflate(R.layout.fragment_circulam, container, false);
courseId = getArguments().getString("course_id","2");
curriculumList = (ListView) rootView.findViewById(R.id.circulamList);
adapter = new ChaptersListAdapter((AppCompatActivity) getActivity(), courses);
curriculumList.setAdapter(adapter);
serverRequestForCompleteModule(); // This function fill arraylist courses with data.
return rootView;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
mActivity = (FragmentActivity) activity;
}

@Override
public void onDetach() {
super.onDetach();
contextd = null;
mActivity = null;
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent
data) {
super.onActivityResult(requestCode, resultCode, data);
if(resultCode == getActivity().RESULT_OK && requestCode == 1111)
{
courses.clear();
courses = (ArrayList<ChapterItem>) data.getSerializableExtra("list");
adapter = new ChaptersListAdapter((AppCompatActivity)mActivity,
courses);
curriculumList.setAdapter(adapter);
}
}


OnItemclick of ChapterListAdapter I am opening Activity MediaplayerActivity3 like this

ChapterListAdapter

void dialogMediaPlayer(final ArrayList<ChapterItem.Module> mlist, final int position, String title, String imageUrl,String chapname,boolean audioStream) {

Intent mint = new Intent(contextd, MediaPlayerActivity3.class);
Bundle bundle = new Bundle();
bundle.putSerializable("courselist",list);
bundle.putSerializable("list",mlist);
bundle.putInt("gpos",glPos);
bundle.putInt("pos",position);
bundle.putString("title",title);
bundle.putString("image",imageUrl);
bundle.putString("chapter",chapname);
bundle.putBoolean("stream",audioStream);
mint.putExtras(bundle);
contextd.startActivityForResult(mint,1111);
contextd.overridePendingTransition( R.anim.slide_up, R.anim.slide_down );
}


Now I do My work In Activity and Now when I backpress I want to update listView in Curriculum Fragment, which I am doing through OnActivityResult method but in onActivityResult method getActivity() always return null.

Onbackpressedmethod in Activity is as follows

MediaPlayerActivity3

public class MediaPlayerActivity3 extends AppCompatActivity implements ResponseDelegate {
@Override
public void onBackPressed() {
saveInsatance(tmpModule.get(position).getModule_id());
stop = false;
myHandler.removeCallbacks(UpdateSongTime);

int x1=0;
if(tmpModule.get(posit).getIs_module_comeplete().equals("0")){
x1=(int)(TimeUnit.MILLISECONDS.toSeconds((long)finalTime)-TimeUnit.MILLISECONDS.toSeconds((long)startTime));
if(x1<5){
serverRequestQuizForAudeoComplite(tmpModule.get(posit).getModule_id());
tmpModule.get(posit).setIs_module_comeplete("1");

}
}
courses.get(glpos).setModule_files(tmpModule);
Intent returnIntent = new Intent();
Bundle bundle = new Bundle();
bundle.putSerializable("list",courses);
bundle.putString("complete",completed);
returnIntent.putExtras(bundle);
setResult(Activity.RESULT_OK,returnIntent);
super.onBackPressed();
}
}


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