hello,

Thankyou for the library. It's working fine. The thing I want to achieve is add a custom row or relative layout between header image & recyclerview. I have tried following this example http://stackoverflow.com/questions/26568087/parallax-header-effect-with-recyclerview#text. The example where the guy inserted a text " Hi, I'm new here " before test 1 & after header image.

The problem with my code is the first element of recylcerview is getting replaced by the custom row that I have created. This is the output http://s11.postimg.org/w31cmp3qb/detail.jpg . the "mobileapp" is the data in the recyclerview .mobileapp 0 is getting hidden or replaced by " MobileApp 0".

This is my code I am using

adapter.implementRecyclerAdapterMethods(new ParallaxRecyclerAdapter.RecyclerAdapterMethods() { @Override public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) { if (i == 0) { ((ViewHolder) viewHolder).title.setText(“MobileApp” + i); ((ViewHolder) viewHolder).ct.setText(“test”); } else if (i > 0) { ((ViewHolder) viewHolder).title2.setText((“mobileapp” + i); ((ViewHolder) viewHolder). title3.setText(“”); }

        }

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(
                ViewGroup viewGroup, final int i) {
            final ViewHolder holder;
            if (i == 3) {
                holder = new ViewHolder(getLayoutInflater().inflate(
                        R.layout.row_recylceview_firstcard, viewGroup,
                        false), i);

            } else {
                holder = new ViewHolder(getLayoutInflater().inflate(
                        R.layout.row_recyclerview, viewGroup, false), i);
                                }
            return holder;
        }

        @Override
        public int getItemCount() {
            return content.size();
        }

});

please help

Wouldn't it be more appropriate if instead of having a method that asks for the implementation, to have them overriden?

I mean, instead of this:

ParallaxRecyclerAdapter<String> adapter = new ParallaxRecyclerAdapter<>(content);
adapter.implementRecyclerAdapterMethods(new ParallaxRecyclerAdapter.RecyclerAdapterMethods() {
    // implemented methods
}

This:

ParallaxRecyclerAdapter<String> adapter = new ParallaxRecyclerAdapter<>(content) {
    // implemented methods
}

Hi I 'm using the adapter in a Fragmet and I can not get it to work, the resulting view is empty.

public class PlaylistPreviewFragment extends Fragment {

    protected RecyclerView recyclerPlaylistTracks;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        View view = inflater.inflate(R.layout.playlist_preview_fragment,container,false);
        recyclerPlaylistTracks = (RecyclerView)view.findViewById(R.id.playlist_tracks);

        final List<String> content = new ArrayList<>();
        for (int i = 0; i < 50; i++) {
            content.add("item " + i);
        }

        final ParallaxRecyclerAdapter<String> adapter = new ParallaxRecyclerAdapter<String>(content) {
            @Override
            public void onBindViewHolderImpl(RecyclerView.ViewHolder viewHolder, ParallaxRecyclerAdapter<String> adapter, int i) {
                TrackViewHolder trackViewHolder = (TrackViewHolder)viewHolder;
                trackViewHolder.setTitle(content.get(i));
            }

            @Override
            public RecyclerView.ViewHolder onCreateViewHolderImpl(ViewGroup viewGroup, final ParallaxRecyclerAdapter<String> adapter, int i) {
                return new TrackViewHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.playlist_track_layout, viewGroup, false));
            }

            @Override
            public int getItemCountImpl(ParallaxRecyclerAdapter<String> adapter) {
                return content.size();
            }
        };

        adapter.setOnClickEvent(new ParallaxRecyclerAdapter.OnClickEvent() {
            @Override
            public void onClick(View v, int position) {
                Toast.makeText(getActivity(), "You clicked '" + position + "'", Toast.LENGTH_SHORT).show();
            }
        });

        recyclerPlaylistTracks.setLayoutManager(new LinearLayoutManager(getActivity()));
        View header = inflater.inflate(R.layout.playlist_tracks_header, recyclerPlaylistTracks, false);
        adapter.setParallaxHeader(header, recyclerPlaylistTracks);
        adapter.setData(content);
        recyclerPlaylistTracks.setAdapter(adapter);


        return view;
    }



    static class TrackViewHolder extends RecyclerView.ViewHolder{

        private TextView title;

        public TrackViewHolder(View itemView) {
            super(itemView);
            title = (TextView)itemView.findViewById(R.id.title);
        }

        public void setTitle(String title) {
            this.title.setText(title);
        }

        public String getTitle() {
            return title.toString();
        }
    }
}

can you help me please?

onCreateViewHolderImpl and onBindViewHolderImpl are never called.

Thanks and greetings

when I do scroll with my fingers everything works fine, but if I want to do it programmatic and for example go to the last element with something like:

recyclerview.scrollToPosition(adapter.getItemCount()-1);

it doesn't work, even with the sample code on this repo, it scrolls but header dissapear when i scroll up again to the same place.

I'm having mu custom viewholder which extends RecyclerView.ViewHolder and I'm dynamically updating the recyclerview. It's showing error while Overriding onBindViewHolder. I have used an Interface 'AccountInfo' instead of 'String' type.

Here's my Adapter code:

public class AccountDetailAdapter extends ParallaxRecyclerAdapter<AccountDetailAdapter.AccountDetailViewHolder> {

  private LayoutInflater inflater;
  private Context context;

  List<AccountInfo> data = Collections.emptyList();

  public AccountDetailAdapter(Context context, final List<AccountInfo> data) {
    super(new ArrayList<AccountInfo>());
    this.context = context;
    inflater = LayoutInflater.from(context);
    this.data = data;
    implementRecyclerAdapterMethods(new RecyclerAdapterMethods() {

        @Override
        public void onBindViewHolder(AccountDetailViewHolder viewHolder, int i) {
            AccountInfo current = data.get(i);
            viewHolder.pName.setText(current.personName);
            viewHolder.pBalance.setText(current.personBalance);
            viewHolder.pIcon.setImageDrawable(current.personIconId);
        }

        @Override
        public AccountDetailViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
            View view = inflater.inflate(R.layout.account_row, viewGroup, false);
            AccountDetailViewHolder holder = new AccountDetailViewHolder(view);
            return holder;
        }

        @Override
        public int getItemCount() {
            return data.size();
        }
     });
  }

   class AccountDetailViewHolder extends RecyclerView.ViewHolder {

        TextView pName;
        TextView pBalance;
        ImageView pIcon;

        public AccountDetailViewHolder(View itemView) {
            super(itemView);

            pName = (TextView) itemView.findViewById(R.id.personName);
            pBalance = (TextView) itemView.findViewById(R.id.personBalance);
            pIcon = (ImageView) itemView.findViewById(R.id.personIconId);
            itemView.setClickable(true);
        }

    }
}

And in calling super(new ArrayList()), it says "ParallaxRecyclerAdapter (java.util.List<com.example.myapp>.AccountDetailAdapter.AccountDetailViewHolder) in ParallaxRecyclerAdapter cannot be applied to java.util.ArrayList<com.example.myapp>.AccountInfo.

How do I port to my own ViewHolder?

Error:A problem occurred configuring project ':app'.

Could not resolve all dependencies for configuration ':app:_debugCompile'. Could not find com.github.kanytu:android-parallax-recyclerview:v1.3. Searched in the following locations: https://jcenter.bintray.com/com/github/kanytu/android-parallax-recyclerview/v1.3/android-parallax-recyclerview-v1.3.pom https://jcenter.bintray.com/com/github/kanytu/android-parallax-recyclerview/v1.3/android-parallax-recyclerview-v1.3.jar file:/C:/Users/Maxime/AppData/Local/Android/sdk/extras/android/m2repository/com/github/kanytu/android-parallax-recyclerview/v1.3/android-parallax-recyclerview-v1.3.pom file:/C:/Users/Maxime/AppData/Local/Android/sdk/extras/android/m2repository/com/github/kanytu/android-parallax-recyclerview/v1.3/android-parallax-recyclerview-v1.3.jar file:/C:/Users/Maxime/AppData/Local/Android/sdk/extras/google/m2repository/com/github/kanytu/android-parallax-recyclerview/v1.3/android-parallax-recyclerview-v1.3.pom file:/C:/Users/Maxime/AppData/Local/Android/sdk/extras/google/m2repository/com/github/kanytu/android-parallax-recyclerview/v1.3/android-parallax-recyclerview-v1.3.jar Required by: mytripeazzy:app:unspecified

I simply want to detect clicks over parallaxAdapter items.

Maybe I'm missing something, I can't get setOnClickEvent() to work.

mAdapter.setOnClickEvent(new ParallaxRecyclerAdapter.OnClickEvent() { @Override public void onClick(View view, int i) { //This is never called } });

Please note that mAdapter.setOnParallaxScroll(new ParallaxRecyclerAdapter.OnParallaxScroll() ... ) works perfectly and I have onBindViewHolderImpl(), onCreateViewHolderImpl(), etc. implemented and working inside the adapter impl

I am trying to create an instance of your adapter by extending it to load arraylist of custom objects from the internet, initially it ll have nothing but later it ll be filled with data. I get this error saying 'no default constructor available' what would be the optimal way to load nothing initially and then load data inside the parallax from the internet, thanks for your reply in advance

Hi. Have you tried to use the onScrollListener on the RecyclerView with this adapter? In my case it is never called! For the rest everything works fine.

The problem is quite simple to explain, but I don't know how to solve it... -> When I start scrolling the percentage and offset are okay, but when I pass the 100% (in the log it reaches 0.99722224) it goes down to 54% and start going up again as I keep scrolling down.

Hi, I've put the recyclerview with parallax header inside a viewpager which have 4 fragment (0 - 3). The problem occurs when the recyclerview is scrolled until the image collapsed, then the viewpager change position from 0 - 2. When i return back to the fragment (position 0) and scrolled back up the image are gone (white blank).

I set the adapter.setParallaxHeader() inside the onCreateView. Is this a bug or am i putting it in the wrong place? Thank you.

Hi Kanyu,

I have update the project by upgrade to the minimal gradle version that could be run by Android Studio 3.2. Hopes you could check it out and merge it so that it could be easier for future maintainability with the newer Android Studio.

Thanks, Elye

In older version gradles project works fine. But today i migrated to android studio 3 with gradle version 3.1.4. After migration same dependency added in build.gradle file. but ParallaxRecyclerAdapter class not getting resolved. pls help me.

https://github.com/kanytu/android-parallax-recyclerview/blob/cad6b8d619a3d2d87efa35e7a8f456f55b120dc5/library/src/main/java/com/poliveira/parallaxrecyclerview/ParallaxRecyclerAdapter.java#L99

Hello, guys I found such a bug:

1. Make the description under the header very large
2. Scroll so that header disappears

header disappears, and then abruptly appears and the description is superimposed on it (see image) the mRecyclerView.computeVerticalScrollOffset() on 99 line produces a value much larger than mHeader.getHeight()

if you write such a piece of code, it will work out correctly

super.onScrolled(recyclerView, dx, dy);
if (mHeader != null) {
  float verticalScrollOffset = MathUtils.min(mRecyclerView.computeVerticalScrollOffset(), 
                                                                    mHeader.getHeight());
  translateHeader(mRecyclerView.getLayoutManager().getChildAt(0) == mHeader ?
                            verticalScrollOffset : mHeader.getHeight());
}