CVApp

NetworkItem.java class

public class IntroductionItem extends AppCompatActivity {

    public RealmList<Introduction> introductionList;
    Context context;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.introduction);

        RecyclerView recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
        recyclerView.setVisibility(View.VISIBLE);

        //TODO move this initialization to App extends Application

        RealmConfiguration realmConfiguration = new RealmConfiguration.Builder().build();

        final Realm realm = Realm.getInstance(realmConfiguration);
        if (InternetConnection.checkConnection(context)) {
            KitabInterface kitabInterface = ApiClient.getApiService();
            Call<KitabSawti> call = kitabInterface.getIntroduction();
            call.enqueue(new Callback<KitabSawti>() {
                @Override
                public void onResponse(Call<KitabSawti> call, Response<KitabSawti> response) {

                    introductionList = response.body().getIntroduction();
                    recyclerView.setAdapter(new IntroductionAdapter(IntroductionItem.this, introductionList));


                    realm.beginTransaction();
                    for (int i = 0; i < introductionList.size(); i++) {

                        Introduction introduction = realm.createObject(Introduction.class);
                        introduction.setImage(introductionList.get(0).getImage());
                        introduction.setIntroduction(introductionList.get(0).getIntroduction());

                    }
                    realm.commitTransaction();
                }else{
                    @Override
                    public void onFailure (Call < KitabSawti > call, Throwable t){
                    List<Introduction> list = realm.where(Introduction.class).findAll();
                    if (list != null) {
                        recyclerView.setAdapter(new IntroductionAdapter(IntroductionItem.this, list));
                    }

                }


                }
            });
        }
    }
}