دى اول خطوه هتجيب كل الجروب بتاعة المستخدم

ChatMyChatsTab.java

rivate void fetchUserGroupsAndPutItIntoRecyclerView() {
        // delete dataSet if Online

        if (mDataset.size() > 0) {
            clearDataSet();
        }

        final String encodedEmail = Utils.encodeEmail(new MAKPrefStore(getActivity()).getPreferenceValue(Constants.PREFERENCE_USER_EMAIL));
        final DatabaseReference mainLocation = FirebaseDatabase.getInstance()
                .getReferenceFromUrl(Constants.FIREBASE_URL);

        mainLocation.child(Constants.FIREBASE_LOCATION_USERS).child(encodedEmail)
                .child(Constants.FIREBASE_LOCATION_ROOMS).addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                if (dataSnapshot.getValue() != null) {
                    // for each group, fetch the name
                    final String groupKey = dataSnapshot.getKey();
                    mainLocation.child(Constants.FIREBASE_LOCATION_ROOMS)
                            .child(groupKey).addListenerForSingleValueEvent(new ValueEventListener() {
                        @Override
                        public void onDataChange(DataSnapshot dataSnapshot) {
                            if (dataSnapshot.getValue() != null) {
                                Groups groups = dataSnapshot.getValue(Groups.class);
                                groups.setGroupId(groupKey);
                                Log.d(Constants.LOGTAG, groups.getName());
                                mDataset.add(groups);
                                // this solve my problem
                                mAdapter.notifyItemInserted(mDataset.size()-1);
                            }

                        }

                        @Override
                        public void onCancelled(DatabaseError databaseError) {

                        }
                    });
                }
            }

            @Override
            public void onChildChanged(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onChildRemoved(DataSnapshot dataSnapshot) {

            }

            @Override
            public void onChildMoved(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });



    }