Realm instance lifecycle per Activity/Fragment

realm-lifecycle-per-screen.java

public class SomeActivity extends AppCompatActivity {
  Realm realm;
  
  @Override
  public void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    realm = Realm.getDefaultInstance();
  }
  
  @Override
  public void onDestroy() {
    super.onDestroy();
    if(realm != null) { // guard against weird low-budget phones
      realm.close();
      realm = null;
    }
  }
}

public class SomeFragment extends Fragment {
  Realm realm;
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle bundle) {
    realm = Realm.getDefaultInstance();
    View view = //... inflate and stuff
    return view;
  }
  
  @Override
  public void onDestroyView() {
    super.onDestroyView();
    if(realm != null) {
      realm.close();
      realm = null;
    }
  }
}