Not displaying in ListView from Firebase

Question

I am able to put data into Firebase database, but when I want to retrieve it and display it to ListView, it only displays blank screen.

BaseActivity class:

public class BaseActivity extends AppCompatActivity {

    @Bean
    OttoBus bus;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        bus.register(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        bus.unregister(this);
    }
}

HomeActivity class:

@OptionsMenu(R.menu.signout)
@EActivity(R.layout.activity_home)
public class HomeActivity extends BaseActivity {

    private static final int LOGIN_REQUEST_CODE = 42;

    @ViewById
    ListView listView;

    @Bean
    ConversationAdapter conversationAdapter;

    @Bean
    UserDao userDao;

    @AfterViews
    void init() {
        // if no user is logged in
        if (FirebaseAuth.getInstance().getCurrentUser() == null) {
            LoginActivity_.intent(this).startForResult(LOGIN_REQUEST_CODE);
        } else {
            userDao.init();
        }

        listView.setAdapter(conversationAdapter);
    }

    @OnActivityResult(value = LOGIN_REQUEST_CODE)
    void loginSucceeded(int resultCode) {
        if (resultCode != RESULT_OK) {
            return;
        }
        userDao.init();
        conversationAdapter.resetConversationFlow();
    }

    @Subscribe
    public void usersLoaded(UsersLoadedEvent event) {
        final FirebaseUser firebaseUser = FirebaseAuth
                .getInstance().getCurrentUser();
        if (userDao.userExists(firebaseUser.getUid())) {
            userDao.setCurrentUser(userDao.getUserById(firebaseUser.getUid()));
        } else {
            final User user = new User(firebaseUser.getUid(),
                    firebaseUser.getDisplayName(),
                    firebaseUser.getPhotoUrl().toString());
            userDao.write(user);
            userDao.setCurrentUser(user);
        }
    }

    @ItemClick
    void listViewItemClicked(Conversation conversation) {
        ConversationActivity_.intent(this)
                .conversation(conversation)
                .start();
    }

    /**
     * When option item with id signOut is clicked.
     */
    @OptionsItem
    void signOut() {
        FirebaseAuth.getInstance().signOut();

        // restart this activity after user is logged out because if there is no user we will start
        // login activity
        final Intent intent = getIntent();
        finish();
        startActivity(intent);
    }

    /**
     * Called when button with id=fab is clicked.
     */
    @Click
    void fab() {
        CreateConversationActivity_.intent(this).start();
    }
}

activity_home.xml

ConversationItemView class:

@EViewGroup(R.layout.item_view_conversation)
public class ConversationItemView extends LinearLayout {

    @ViewById
    TextView title;

    public ConversationItemView(Context context) {
        super(context);
    }

    public void bind(Conversation conversation) {
        title.setText(conversation.getTitle());
    }
}

item_view_conversation.xml

ConversationDao class

@EBean(scope = EBean.Scope.Singleton)
public class ConversationDao {

    static final String CONVERSATION_TAG = "conversations";

    private FirebaseDatabase database = FirebaseDatabase.getInstance();

    private List conversations = new ArrayList<>();

    private Map conversationMap = new HashMap<>();

    @Bean
    OttoBus bus;

    /**
     * After this class is injected call this method.
     */
    @AfterInject
    public void init() {
        database.getReference(CONVERSATION_TAG).addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                conversationMap = dataSnapshot.getValue(
                        new GenericTypeIndicator>() {
                        });
                publish();
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });
    }

    public void write(Conversation conversation) {
        final DatabaseReference databaseReference =
                database.getReference(CONVERSATION_TAG).push();

        conversation.setId(databaseReference.getKey());     // set unique key to our conversation
        databaseReference.setValue(conversation);           // push conversation to database
    }

    public List getConversations() {
        return conversations;
    }

    private void publish() {
        conversations.clear();
        if (conversationMap != null) {
            conversations.addAll(conversationMap.values());
        }

        // post to event bus
        bus.post(new ConversationsUpdateEvent());
    }

ConversationAdapter class:

@EBean
public class ConversationAdapter extends BaseAdapter {

    private List conversations = new ArrayList<>();

    @RootContext
    Context context;

    @Bean
    ConversationDao conversationDao;

    @Bean
    OttoBus bus;

    /**
     * This method is called after this class is injected.
     */
    @AfterInject
    void init() {
        bus.register(this);
    }

    public void resetConversationFlow() {
        conversationDao.init();
    }

    @Override
    public int getCount() {
        return conversations.size();
    }

    @Override
    public Conversation getItem(int position) {
        return conversations.get(position);
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ConversationItemView conversationItemView;

        if (convertView == null) {  // if view item is not created
            conversationItemView = ConversationItemView_.build(context);
        } else {    // if view item was already created
            conversationItemView = (ConversationItemView) convertView;
        }

        // bind data to view
        conversationItemView.bind(getItem(position));

        return conversationItemView;
    }

    private void setConversations(List conversations) {
        this.conversations = conversations;

        // notify that data set changed so that the list is refreshed
        notifyDataSetChanged();
    }

    @Subscribe
    public void conversationsUpdated(ConversationsUpdateEvent event) {
        setConversations(conversationDao.getConversations());
    }
}

So, what am I missing here. Why is not displaying conversation title into ListView?

Not displaying in ListView from Firebase

Answers (1)

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