Viewpager not showing inside RecyclerView row

Question

I want to make a 'Photo details' activity or fragment where i display the photo on top and below it aViewpPager that display both comments and likes of the related photo(2 tabs). In order to make the screen 'Scrollable' so i can scroll up/down on both comments and likes and slide left/right i decided to use a RecyclerView with 2 rows :

ROW 1 : The photo (ImageView).

ROW 2 : SlidingTabLayout + ViewPager + FragmentPagerAdapter.

The code compile and run, display the image and the slidingTabLayout but not the ViewPager.

So my two main questions are :

1-What's wrong with my implementation.

2-Is there an alternative or better solution for what i want to achieve ?

Note : I don't want to use a listView with header.I want to use RecyclerView because it's easier to add elements on top/bottom from network.

PhotoDetailsActivity.java

public class MainActivity extends ActionBarActivity {     RecyclerView recyclerViewPhotoDetails;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          this.recyclerViewPhotoDetails = (RecyclerView) this.findViewById(R.id.recycler_view_photo_details);         this.recyclerViewPhotoDetails.setLayoutManager(new LinearLayoutManager(this));         this.recyclerViewPhotoDetails.setAdapter(new PhotoDetailsRecyclerAdapter(this.getSupportFragmentManager()));     } } 

PhotosDetailsRecyclerAdapter.java

public class PhotoDetailsRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {     private static final int ROW_IMAGE = 0;     private static final int ROW_LIKES_AND_COMMENTS = 1;     private static final int TOTAL_ROWS = 2;      private FragmentManager fragmentManager;      public PhotoDetailsRecyclerAdapter(FragmentManager fragmentManager) {         this.fragmentManager = fragmentManager;     }      @Override     public int getItemViewType(int position) {         if (position == 0) {             return ROW_IMAGE;         } else {             return ROW_LIKES_AND_COMMENTS;         }     }      @Override     public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {         if(viewType == ROW_IMAGE) {             View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_image, parent, false);             return new ImageViewHolder(view);         } else {             View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_comments_and_likes, parent, false);             return new CommentsAndLikesViewHolder(view);         }     }      @Override     public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {     }      @Override     public int getItemCount() {         return TOTAL_ROWS;     }      public class ImageViewHolder extends RecyclerView.ViewHolder {         public ImageViewHolder(View itemView) {             super(itemView);         }     }      public class CommentsAndLikesViewHolder extends RecyclerView.ViewHolder {         private SlidingTabLayout slidingTabLayout;         private ViewPager viewPager;          public CommentsAndLikesViewHolder(View view) {             super(view);              slidingTabLayout = (SlidingTabLayout) view.findViewById(R.id.sliding_tab_layout_comments_and_likes);             viewPager = (ViewPager) view.findViewById(R.id.view_pager_comments_and_likes);              viewPager.setAdapter(new CommentsAndLikesPagerAdapter(fragmentManager));             slidingTabLayout.setDistributeEvenly(true);             slidingTabLayout.setViewPager(viewPager);         }     } } 

activity_main.xml

<android.support.v7.widget.RecyclerView     xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/recycler_view_photo_details"     android:scrollbars="vertical"     android:layout_width="match_parent"     android:layout_height="match_parent"     /> 

layout_image.xml

<?xml version="1.0" encoding="utf-8"?> <FrameLayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:orientation="vertical"     >      <ImageView         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:adjustViewBounds="true"         android:scaleType="centerCrop"         android:src="@drawable/img"         />  </FrameLayout> 

layout_comments_and_likes.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="match_parent"     android:orientation="vertical"     >      <org.bitbucket.androidapp.SlidingTabLayout         android:id="@+id/sliding_tab_layout_comments_and_likes"         android:layout_width="match_parent"         android:layout_height="48dp"         android:background="@android:color/darker_gray"         />      <android.support.v4.view.ViewPager         android:id="@+id/view_pager_comments_and_likes"         android:layout_height="match_parent"         android:layout_width="match_parent"         android:background="@android:color/holo_blue_dark"         />  </LinearLayout> 

CommentsAndLikesPagerAdapter.java

public class CommentsAndLikesPagerAdapter extends FragmentPagerAdapter {     private static final int TOTAL_TABS = 2;      private String[] tabs = { "comments", "likes" };      public CommentsAndLikesPagerAdapter(FragmentManager fm) {         super(fm);     }      @Override     public Fragment getItem(int position) {         if(position == 0) {             return new CommentsFragment();         } else {             return new LikesFragment();         }     }      @Override     public CharSequence getPageTitle(int position) {         return tabs[position];     }      @Override     public int getCount() {         return TOTAL_TABS;     } } 

CommentsFragment.java

 public class CommentsFragment extends Fragment {     @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {         View view = inflater.inflate(R.layout.fragment_comments, container, false);         RecyclerView recyclerViewComments = (RecyclerView) view.findViewById(R.id.recycler_view_comments);         recyclerViewComments.setLayoutManager(new LinearLayoutManager(this.getActivity()));         recyclerViewComments.setAdapter(new CommentsRecyclerAdapter());         return view;     } } 

fragment_comments.xml

<android.support.v7.widget.RecyclerView     xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/recycler_view_comments"     android:scrollbars="vertical"     android:layout_width="match_parent"     android:layout_height="match_parent"     /> 

LikesFragment.java

public class LikesFragment extends Fragment {     @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {         View view = inflater.inflate(R.layout.fragment_likes, container, false);         RecyclerView recyclerViewLikes = (RecyclerView) view.findViewById(R.id.recycler_view_likes);         recyclerViewLikes.setLayoutManager(new LinearLayoutManager(this.getActivity()));         recyclerViewLikes.setAdapter(new LikesRecyclerAdapter());         return view;     } } 

fragment_likes.xml

<android.support.v7.widget.RecyclerView     xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/recycler_view_likes"     android:scrollbars="vertical"     android:layout_width="match_parent"     android:layout_height="match_parent"     /> 

layout_comment.xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="match_parent"     android:layout_height="match_parent">      <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_centerInParent="true"         android:text="Comment"         />  </RelativeLayout> 

layout_like.xml

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="match_parent"     android:layout_height="match_parent">      <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_centerInParent="true"         android:text="Like"         />  </RelativeLayout> 

Answer 1

I've faced this problem and resolved this by set ID for each ViewPager :) ViewPager does not allow sharing of the id in the same fragment, even if it is part of a recyclerview context.

pagerHolder.pager.setId(position);