You cannot start a load on a not yet attached View or a Fragment where getActivity() returns null

Question

I am using FragmentStatePagerAdapter to show around 5 fragments in an activity.On each activity I am showing the images which I am fetching from FirebaseListAdapter/Firebase

Answer 1

ArrayList<ClientData> clientData = new ArrayList<>();
int j=0;
for (String h:profileImg)
{
    ClientData clientItem = new ClientData();
    clientItem.setProfileImage(h);
    clientItem.setName(name[j]);
    clientItem.setAddress(location[j]);
    clientData.add(clientItem);
    j++;
    }
    RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplication(),RecyclerView.VERTICAL,false);
    recy_client.setLayoutManager(layoutManager);
    recy_client.setItemAnimator(new DefaultItemAnimator());
    clientAdp = new ClientAdp(getApplicationContext(),clientData);
    recy_client.setAdapter(clientAdp);

Replace From

clientAdp = new ClientAdp(context,clientData);

To

clientAdp = new ClientAdp(getApplicationContext(),clientData);

in my case

Answer 2

I Found this way too

public class NoteAdapter extends FirestoreRecyclerAdapter<Note,NoteAdapter.NoteHolder> {

Context context;

public NoteAdapter(@NonNull FirestoreRecyclerOptions<Note> options) {
    super(options);
}

@Override
protected void onBindViewHolder(@NonNull NoteHolder holder, int position, @NonNull final Note model) {


    context = holder.itemView.getContext();

    holder.r_tv.setText(model.getTitle());
    Glide.with(context).load(model.getImage()).into(holder.r_iv);


    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(context, CategoryProductActivity.class);
            MainActivity.myCategory2 = model.getTitle();
            MainActivity.myCategoryIcon2 = model.getImage();
            context.startActivity(i);
        }
    });

}

@NonNull
@Override
public NoteHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_category,parent,false);

    return new NoteHolder(v);
}

public static class NoteHolder extends RecyclerView.ViewHolder
{
    TextView r_tv;
    ImageView r_iv;

    public NoteHolder(@NonNull View itemView) {
        super(itemView);

        r_tv = itemView.findViewById(R.id.r_tv);
        r_iv = itemView.findViewById(R.id.r_iv);


    }
}
}

Answer 3

1. Add Below Code on Activity on which RecyclerView is present

   public static Context context;
   

2. Then in onCreate of the same Activity on which RecyclerView is present add below Code

   context = getApplicationContext();
   

3. then take reference to glide as shown below

   Glide.with(YourActivity.context).load("Image Link").into(holder.YourImageView);
   

Answer 4

Your fragment is detached before response coming from firebase, So try to check getActivity() null before using that

public void onDataChange(DataSnapshot dataSnapshot) {
    if (getActivity() == null) {
        return;
    }
    Child child = dataSnapshot.getValue(Child.class);
    uname.setText(child.getUsername());
    Glide.with(getActivity()).load(child.getProfileImage()).into(profileImage);
}

You can do like to check activity is null or not in other place.

private Activity mActivity;

@Override
public void onAttach(Context context) {
    super.onAttach(context);

    mActivity = getActivity();
}

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

private void doAction() {
    if (mActivity == null) {
        return;
    }

    adapt = new FirebaseListAdapter<MyClassStudent>(mActivity, MyClassStudent.class, R.layout.mychild_grid_template, myRef) {
        @Override
        protected void populateView(final View v, MyClassStudent model, int position) {
            final TextView uname = (TextView) v.findViewById(R.id.mychild_uname);

            final CircleImageView profileImage = (CircleImageView) v.findViewById(R.id.mychild_image);
            studRef.child(model.getUsername()).addListenerForSingleValueEvent(new ValueEventListener() {
                public void onDataChange(DataSnapshot dataSnapshot) {
                    if (mActivity == null) {
                        return;
                    }
                    Child child = dataSnapshot.getValue(Child.class);
                    uname.setText(child.getUsername());
                    Glide.with(mActivity).load(child.getProfileImage()).into(profileImage);
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });
        }
    };
}

Answer 5

I prefer using isAdded() method of fragment before loading image with Glide.