Agfdhyk

I am struggling to populate my recycler view and I can't identify why. I trying to populate the view with data from Firebase Database, I can successfully get the data, but I can't figure out how to properly set up the recycler view, I am also using FirebaseUI. Here is my Activity containing the firebaseUI and database call:

public class LoggedInActivity extends AppCompatActivity {



private DatabaseReference mDatabase;



RecyclerView contentView;



private TextView mTextMessage;

        ImageButton positive;

        ImageButton balanced;

        ImageButton negative;



private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener

        = new BottomNavigationView.OnNavigationItemSelectedListener() {



    @Override

    public boolean onNavigationItemSelected(@NonNull MenuItem item) {

        switch (item.getItemId()) {

            case R.id.navigation_home:

                mTextMessage.setText(R.string.title_home);



                return true;

            case R.id.navigation_dashboard:

                mTextMessage.setText(R.string.title_dashboard);



                return true;

            case R.id.navigation_notifications:

                mTextMessage.setText(R.string.title_notifications);



                return true;

        }

        return false;

    }

};



@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_logged_in);



    positive = findViewById(R.id.heartButton);

    balanced = findViewById(R.id.balancedButton);

    negative = findViewById(R.id.negativeButton);



    mTextMessage = findViewById(R.id.message);

    mTextMessage.setTextColor(Color.WHITE);

    BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);

    navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);



    mDatabase = FirebaseDatabase.getInstance().getReference();



    DatabaseReference mRef = mDatabase.child("posts");

    Query query = FirebaseDatabase.getInstance()

            .getReference()

            .child("posts")

            .limitToLast(50);



    query.addChildEventListener(new ChildEventListener() {

        @Override

        public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) {

            Post newPost = dataSnapshot.getValue(Post.class);

            System.out.println("Title: " + newPost.title);

            System.out.println("Body: " + newPost.body);

            System.out.println("Previous Post ID: " + prevChildKey);

        }



        @Override

        public void onChildChanged(DataSnapshot dataSnapshot, String prevChildKey) {}



        @Override

        public void onChildRemoved(DataSnapshot dataSnapshot) {}



        @Override

        public void onChildMoved(DataSnapshot dataSnapshot, String prevChildKey) {}



        @Override

        public void onCancelled(DatabaseError databaseError) {}

    });





        FirebaseRecyclerOptions<Post> options =

            new FirebaseRecyclerOptions.Builder<Post>()

                    .setQuery(query, Post.class)

                    .build();



    FirebaseRecyclerAdapter adapter = new FirebaseRecyclerAdapter<Post, PostHolder>(options) {

        @Override

        public PostHolder onCreateViewHolder(ViewGroup parent, int viewType) {

            // Create a new instance of the ViewHolder, in this case we are using a custom

            // layout called R.layout.message for each item

            View view = LayoutInflater.from(parent.getContext())

                    .inflate(R.layout.post_content, parent, false);



            return new PostHolder(view);

        }



        @Override

        protected void onBindViewHolder(PostHolder holder, int position, Post model) {

            // Bind the Chat object to the ChatHolder

            // ...

           holder.bind





        }

    };



    contentView = findViewById(R.id.recyclerView);

    contentView.setAdapter(adapter);



}



}

I also created my class for retrieving Posts from the database:

@IgnoreExtraProperties

public class Post {



public String title;

public String body;

public String username;



public Post() {

    // Default constructor required for calls to DataSnapshot.getValue(User.class)

}



public Post(String title, String body, String username) {

    title = title;

    body = body;

    username = username;

}



public String getTitle() { return title; }



public String getBody() { return body; }



public String getUsername() { return username; }



}

I am just trying to get the post Title at the moment, I have made this custom holder:

public class PostHolder extends RecyclerView.ViewHolder {



TextView title;

TextView body;

TextView username;



public PostHolder(@NonNull View itemView) {

    super(itemView);

    title = (TextView) itemView.findViewById(R.id.title)

}



}

Here is where I think I run into the problem, I am not sure how I bind the Post data to get it to show up on this Label that I created as post_content.xml:

 <?xml version="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal"

android:padding="10dp">



<TextView

    android:id="@+id/title"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:textSize="20sp"/>



 </LinearLayout>

I would appreciate an explanation on this system as I am finding it a bit confusing in regards to the custom holder, binding and inflating portions.
Where am I going wrong? Thank you.