Send data (ArrayList) from an activity to a fragment… here is a solution to the problem.
Send data (ArrayList) from an activity to a fragment
I only have one activity
and only one related fragment
. Fragment
is part of Navigation Lader
. Now I have an ArrayList<String>
constantly changing. I want to do so that whenever I open the Navigation Lader
, the ArrayList
should be passed to the Fragment
Fragment
has a ListView
populated with an ArrayList
This is the Activity
code for Toolbar
and DrawerLayout
:
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
OnlineNavDrawerFragment drawerFragment = (OnlineNavDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.fragmentUsers);
drawerFragment.setUp((DrawerLayout) findViewById(R.id.drawer_layout), toolbar);
This is the corresponding code for Fragment
:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_online_nav_drawer, container, false);
ListView lvOnline = (ListView) view.findViewById(R.id.lvOnlineUsers);
return view;
}
public void setUp(DrawerLayout drawerLayout, Toolbar toolbar) {
mDrawerLayout = drawerLayout;
mDrawerToggle = new ActionBarDrawerToggle(getActivity(), drawerLayout,
toolbar, R.string.drawer_open, R.string.drawer_close) {
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
getActivity().invalidateOptionsMenu();
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
@Override
public void run() {
mDrawerToggle.syncState();
}
});
}
I’m faced with the following problem: how to < String > via ArrayList
from Activity
to Fragment
Also, I don’t see what bit of code in the activity
I can actually pass the data.
PS: Most of the code is a modified version of the code shown in the YouTube video series. It operates in its current form.
Solution
Do this in your fragment.
GetDataInterface sGetDataInterface;
public interface GetDataInterface {
ArrayList<String> getDataList();
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
sGetDataInterface= (GetDataInterface) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + "must implement GetDataInterface Interface");
}
@Override
public void onResume() {
super.onResume();
if(sGetDataInterface != null){
mData = sGetDataInterface.getDataList();
}
}
}
In your main activity
public class MainActivity implements YourFragmentName.GetDataInterface {
@Override
public ArrayList<String> getDataList() {
return mDataArrayList;
}
}