title: I cant see any FirebaseRecyclerAdapter items on my layout
body: <p>Im trying to retrieve data from Firebase database to my layout and i cant see any items of <code>FirebaseRecyclerAdapter</code> in the layout, please help. i followed a tutorial that showed how to do that and when i run the app i doesn't see any items but i can scroll.</p>
  
  <pre><code>public class Home extends AppCompatActivity {
  Button logout;
  FirebaseAuth firebaseAuth;
  private static final String Tag = "Home";
  DatabaseReference dbUsers;
  DatabaseReference db;
  private RecyclerView mBlogList;
  FirebaseAuth.AuthStateListener authStateListener;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_home);
      logout = (Button) findViewById(R.id.logout);
      dbUsers = FirebaseDatabase.getInstance().getReference().child("Users");
      Log.d(Tag, "onCreate: starting");
      firebaseAuth = FirebaseAuth.getInstance();
      dbUsers.keepSynced(true);
      db = FirebaseDatabase.getInstance().getReference().child("Blog");
      db.keepSynced(true);
      mBlogList = (RecyclerView)findViewById(R.id.Blog_List);
      mBlogList.setHasFixedSize(true);
      mBlogList.setLayoutManager(new LinearLayoutManager(this));
  
      setUpNav();
  
      authStateListener = new FirebaseAuth.AuthStateListener() {
          @Override
          public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
              if (firebaseAuth.getCurrentUser() == null) {
                  Intent lgnIntent = new Intent(getApplicationContext(), MainActivity.class);
                  lgnIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                  startActivity(lgnIntent);
              }
          }
      };
  
  }
  
  @Override
  protected void onStart() {
      super.onStart();
      firebaseAuth.addAuthStateListener(authStateListener);
      checkUser();
  
  
  
      FirebaseRecyclerOptions&lt;Postzone&gt; options =
              new FirebaseRecyclerOptions.Builder&lt;Postzone&gt;()
                      .setQuery(db, Postzone.class)
                      .build();
  
      FirebaseRecyclerAdapter&lt;Postzone, PostViewHolder&gt; firebaseRecyclerAdapter = new FirebaseRecyclerAdapter&lt;Postzone, PostViewHolder&gt;(options) {
  
          @Override
          protected void onBindViewHolder(@NonNull PostViewHolder holder, int position, @NonNull Postzone model) {
  
              final String post_key = getRef(position).getKey().toString();
              holder.setTitle(model.getTitle());
              holder.setDesc(model.getDesc());
              holder.setName(model.getUsername());
              holder.setImage(getApplicationContext(),model.getImageUrl());
              holder.mView.setOnClickListener(new View.OnClickListener() {
                  @Override
                  public void onClick(View view) {
                      Intent singleActivity = new Intent(Home.this, SinglePostActivity.class);
                      singleActivity.putExtra("PostID", post_key);
                      startActivity(singleActivity);
                  }
          });
          }
  
          @Override
          public PostViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
              View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.blog_row, parent, false);
              return new PostViewHolder(view);
          }
      };
      mBlogList.setAdapter(firebaseRecyclerAdapter);
  }
  
  public static class PostViewHolder extends RecyclerView.ViewHolder{
  
      View mView;
      public PostViewHolder(View itemView) {
          super(itemView);
  
          mView= itemView;
      }
  
      public void setTitle(String title){
  
          TextView post_title = (TextView) mView.findViewById(R.id.post_title);
          post_title.setText(title);
      }
  
      public void setName(String name){
  
          TextView post_user = (TextView) mView.findViewById(R.id.madeBy);
          post_user.setText(name);
      }
  
      public void setDesc(String desc){
  
          TextView post_desc = (TextView) mView.findViewById(R.id.post_desc);
          post_desc.setText(desc);
      }
  
      public void setImage(Context ctx, String image){
          ImageView img = (ImageView) mView.findViewById(R.id.post_image);
          Picasso.with(ctx).load(image).into(img);
      }
  }
  
  private void checkUser() {
      if (firebaseAuth.getCurrentUser() != null) {
          final String user_id = firebaseAuth.getCurrentUser().getUid();
          dbUsers.addValueEventListener(new ValueEventListener() {
              @Override
              public void onDataChange(DataSnapshot dataSnapshot) {
                  if (!dataSnapshot.hasChild(user_id)) {
                      Intent main = new Intent(Home.this, Account_Setup.class);
                      main.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                      startActivity(main);
                  }
  
              }
  
              @Override
              public void onCancelled(DatabaseError databaseError) {
  
              }
          });
      }
  }
  
  private void setUpNav() {
      Log.d(Tag, "setUpNav: starting func.");
      BottomNavigationViewEx nav = (BottomNavigationViewEx) findViewById(R.id.bottomNavViewBar);
      BottomNavigationViewHelper.setupBottomNav(nav);
      BottomNavigationViewHelper.enableNav(Home.this, nav);
      Menu menu = nav.getMenu();
      MenuItem item = menu.getItem(0);
      item.setChecked(true);
  }
  }    
  </code></pre>
  
  <p>This is the Home.xml layout:</p>
  
  <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:orientation="vertical"
  android:layout_height="match_parent"
  app:layout_behavior="@string/appbar_scrolling_view_behavior"
  tools:context="com.apps.amith.scj.Home"
  tools:showIn="@layout/activity_home"&gt;
  
  &lt;RelativeLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"&gt;
  
      &lt;android.support.v7.widget.RecyclerView
          android:id="@+id/Blog_List"
          android:layout_width="match_parent"
          android:layout_margin="10dp"
          android:layout_height="match_parent"&gt;
      &lt;/android.support.v7.widget.RecyclerView&gt;
  
      &lt;include layout="@layout/bottom_nav"/&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p></p>
  
  <p>This is the blog class:</p>
  
  <pre><code>public class Postzone {
  
  private String title, desc, imageUrl, username, profImg;
  
  public Postzone(String title, String desc, String imageUrl, String username, String profImg) {
      this.title = title;
      this.desc = desc;
      this.profImg = profImg;
      this.imageUrl=imageUrl;
      this.username = username;
  }
  
  public Postzone() {
  }
  public void setImageUrl(String imageUrl) {
      this.imageUrl = imageUrl;
  }
  
  public void setUsername(String username) {
      this.username = username;
  }
  
  public void setTitle(String title) {
      this.title = title;
  }
  
  public void setDesc(String desc) {
      this.desc = desc;
  }
  
  public String getImageUrl() {
      return imageUrl;
  }
  
  public String getTitle() {
      return title;
  }
  
  public String getDesc() {
      return desc;
  }
  
  public String getUsername() {
      return username;
  }
  
  public String getProfImg() {
      return profImg;
  }
  
  public void setProfImg(String profImg) {
      this.profImg = profImg;
  }
  }
  </code></pre>
  
  <p>This is the blog row:</p>
  
  <pre><code>&lt;android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent" android:layout_height="wrap_content"
  android:layout_margin="20dp"&gt;
  
  &lt;LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical"&gt;
  
      &lt;ImageView
          android:id="@+id/post_image"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:adjustViewBounds="true"
          android:background="@drawable/def_profile" /&gt;
  
      &lt;TextView
          android:id="@+id/post_title"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="Post Text Goes Here"
          android:textSize="16dp"
          android:textStyle="bold" /&gt;
  
      &lt;TextView
          android:id="@+id/post_desc"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="The post Description Goes here" /&gt;
  
      &lt;TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="נוצר על ידי:"
          android:id="@+id/madeBy"/&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p></p>