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

user_2505890 0
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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/FirebaseRecyclerAdapter. As it is FragmentStagePagerAdapter adjacent views/Fragments will be initialized even they are not visible.If the tabs are scrolled in a fast manner (forward/backward) App is crashing with above mentioned error.I found out some similar issues on the internet but not able to fix this issue.I am also getting You cannot start a load for a destroyed activity error if I am starting a new activity(In activity I am showing images from firebase in a grid view) and closing it immediately(pressing the back button) I am using following code.

adapt= new FirebaseListAdapter<MyClassStudent>(getActivity(), 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) {
                        Child child=dataSnapshot.getValue(Child.class);
                        uname.setText(child.getUsername());
                        Glide.with(getActivity()).load(child.getProfileImage()).into(profileImage);
                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });
            }
        };

Stack Trace:

E/UncaughtException: java.lang.NullPointerException: You cannot start a load on a not yet attached View or a  Fragment where getActivity() returns null (which usually occurs when getActivity() is called before the Fragment is attached or after the Fragment is destroyed).
                         at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:27)
                         at com.bumptech.glide.Glide.getRetriever(Glide.java:509)
                         at com.bumptech.glide.Glide.with(Glide.java:563)
                         at com.mycompany.educareteacher.FragmentStudents$2$1.onDataChange(FragmentStudents.java:184)
                         at com.google.firebase.database.zzp.onDataChange(Unknown Source)
                         at com.google.android.gms.internal.tl.zza(Unknown Source)
                         at com.google.android.gms.internal.vg.zzHW(Unknown Source)
                         at com.google.android.gms.internal.vm.run(Unknown Source)
                         at android.os.Handler.handleCallback(Handler.java:739)
                         at android.os.Handler.dispatchMessage(Handler.java:95)
                         at android.os.Looper.loop(Looper.java:148)
                         at android.app.ActivityThread.main(ActivityThread.java:5438)
                         at java.lang.reflect.Method.invoke(Native Method)
                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)
D/FA: Logging event (FE): app_exception(_ae), Bundle[{firebase_event_origin(_o)=crash, firebase_screen_class(_sc)=ClassDetailActivity, firebase_screen_id(_si)=-4663411025690523798, timestamp=1500710706898, fatal=1}]
V/FA: Recording user engagement, ms: 3544
D/FA: Logging event (FE): user_engagement(_e), Bundle[{firebase_event_origin(_o)=auto, engagement_time_msec(_et)=3544, firebase_screen_class(_sc)=ClassDetailActivity, firebase_screen_id(_si)=-4663411025690523798}]
E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.mycompany.com.educareteacher, PID: 5154
                  java.lang.NullPointerException: You cannot start a load on a not yet attached View or a  Fragment where getActivity() returns null (which usually occurs when getActivity() is called before the Fragment is attached or after the Fragment is destroyed).
                      at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:27)
                      at com.bumptech.glide.Glide.getRetriever(Glide.java:509)
                      at com.bumptech.glide.Glide.with(Glide.java:563)
                      at com.mycompany.educareteacher.FragmentStudents$2$1.onDataChange(FragmentStudents.java:184)
                      at com.google.firebase.database.zzp.onDataChange(Unknown Source)
                      at com.google.android.gms.internal.tl.zza(Unknown Source)
                      at com.google.android.gms.internal.vg.zzHW(Unknown Source)
                      at com.google.android.gms.internal.vm.run(Unknown Source)
                      at android.os.Handler.handleCallback(Handler.java:739)
                      at android.os.Handler.dispatchMessage(Handler.java:95)
                      at android.os.Looper.loop(Looper.java:148)
                      at android.app.ActivityThread.main(ActivityThread.java:5438)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:738)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:628)

How Can I solve this issue?

android-glide android-fragments firebase android
7 Answers

  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);
user_122664340

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);


    }
}
}
user_122664340

in fragment just use.

if (getActivity != null) { 
    Glide.with(getActivity()).load(imageUrl).into(yourImageView); 
}
user_163608360

This problem arise when you miss to add context in the constructor of a adapter and you can easily solve it :-)

Do not forget to add this.context = context in the constructor

public groupUserAdapter(Context context, ArrayList<Users> groupUsers) {
    this.groupUsers = groupUsers;
    this.context = context;
};
user_102431010 
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

user_148497020
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