How can I get access to a fragment method from another activity

Question

I have a fragment which summons a custom CursorAdaper and display it on a ListView . The thing is I want to change the cursor by changeCursor() from another activity when I add new data, How can I get access to the CursorAdapter displayed on the fragment?

Answer 1

Essentially you have to pass data from one Activity to another and let the fragment of you choice receive the data (each fragment of a given Activity may get the Intent that started/restarted/resumed the Activity).

Consider this code

-- pass data:

String[] myListEntries = getNewListContents();
Intent updateList = new Intent(this, ActivityThatListFragmentBelongsTo.class);
updateList.putExtra("updated_list", myListEntries);
startActivity(updateList);

-- receive data (in fragment):

@Override
public void onResume() {
  Intent wasStartedWithData = getActivity().getIntent();
  String[] updatedList = wasStartedWithData.getStringArrayExtra("updated_list");
  // pass updatedList to adapter
}

Now you might actually have more complicated data than an Array of Strings. In this case you could create a class that implements 'Parcelable' ( http://developer.android.com/reference/android/os/Parcelable.html ) and call putExtra(Parcelable parcel) / getParcelableExtra(String name) on the Intent.