Develop Reference

How to implement nested RecycleView?

I am trying to implement a nested recycle view i read several post online, but i am still having a difficult time. This is what i did so far, i created a main layout which contains my main Recycle view, i then created the main recycle view row item. And populated it by creating an adapter and implementing it in my main activity. Secondly, i crated a layout with my child recycle view as well as the child recycle view row item. The problem arises when i am trying to access this recycle view, i am unsure as to how to go about doing this? I was able to access my parent recycle and implement the adapter in my main activity, but i am not sure as to how to access my child recycle view. Could someone assist me?
**Parent Recycle View**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
</androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>
**Parent Recycle View row**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view_home"
android:layout_width="130dp"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:elevation="5dp"
app:cardUseCompatPadding="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/image_view_movie"
android:layout_width="130dp"
android:layout_height="170dp"
android:scaleType="fitXY"
/>
<LinearLayout
android:id="#+id/layout_mov"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/image_view_movie"
android:layout_margin="1dp"
android:orientation="vertical">
<TextView
android:id="#+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxLines="1"
android:text="Mission Impossible"
android:textSize="12sp" />
<TextView
android:id="#+id/tv_genre"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:fontFamily="sans-serif"
android:maxLines="1"
android:text="Action,Comedy..."
android:textSize="12sp" />
</LinearLayout>
</RelativeLayout>
</androidx.cardview.widget.CardView>
</RelativeLayout>
**Child RecycleView**
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/tv_movie_category"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:text="Movie Category"
android:textSize="14sp"
android:textStyle="bold" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/home_recycler_view_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/tv_movie_category"
android:layout_marginLeft="10dp"
android:layout_marginBottom="15dp"
android:orientation="horizontal" />
<View
android:id="#+id/activityMainDivider"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_below="#+id/home_recycler_view_horizontal"
android:layout_marginBottom="5dp"
android:background="#31C7C7CC" />
</RelativeLayout>
**Child recycle view row**
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="#+id/constraintlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="15dp">
<androidx.cardview.widget.CardView
android:id="#+id/cardView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
app:cardElevation="5dp"
app:cardUseCompatPadding="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/newsThumbNail"
android:layout_width="0dp"
android:layout_height="200dp"
android:scaleType="fitXY"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.448"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0" />
<TextView
android:id="#+id/newsTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Dangerous fire is out of control at 24 and park"
android:textSize="17sp"
app:layout_constraintEnd_toEndOf="#+id/newsThumbNail"
app:layout_constraintStart_toStartOf="#+id/newsThumbNail"
app:layout_constraintTop_toBottomOf="#+id/newsThumbNail" />
<TextView
android:id="#+id/newsBody"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:text="Some text is here"
app:layout_constraintEnd_toEndOf="#+id/newsTitle"
app:layout_constraintStart_toStartOf="#+id/newsTitle"
app:layout_constraintTop_toBottomOf="#+id/newsTitle" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
**Parent Adapter**
public class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MessageViewHolder> {
private Context context;
private ArrayList<DataModel> userMessagesList;
public HomeAdapter(Context context, ArrayList<DataModel> userMessageList) {
this.context = context;
this.userMessagesList = userMessageList;
}
#NonNull
#Override
public MessageViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.inner_recycleview_row, viewGroup, false);
return new MessageViewHolder(view);
}
//Loads data into views
#Override
public void onBindViewHolder(#NonNull MessageViewHolder viewHolder, int i) {
// viewHolder.senderTextView.setText(message.getMessage());
viewHolder.senderTextView.setText(userMessagesList.get(i).getName());
viewHolder.receiverTextView.setText(userMessagesList.get(i).getAge());
}
#Override
public int getItemCount() {
return userMessagesList.size();
}
//links up ui elements
static class MessageViewHolder extends RecyclerView.ViewHolder {
private TextView senderTextView, receiverTextView;
public MessageViewHolder(#NonNull View itemView) {
super(itemView);
senderTextView = itemView.findViewById(R.id.tv_genre);
receiverTextView = itemView.findViewById(R.id.tv_title);
}
}
}
**Main Activity**
public class MainActivity extends AppCompatActivity {
private RecyclerView messagesRecycleView;
private ArrayList<DataModel> messageList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
messageList = new ArrayList<>();
initRecycleView();
populateArray();
}
public void populateArray(){
DataModel dataModel1= new DataModel("Bob","18");
messageList.add(dataModel1);
}
//set up RecycleView
public void initRecycleView() {
messagesRecycleView = findViewById(R.id.rv_main);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setStackFromEnd(true);
//linearLayoutManager.setReverseLayout(true);
messagesRecycleView.setLayoutManager(linearLayoutManager);
HomeAdapter homeAdapter = new HomeAdapter(MainActivity.this, messageList);
messagesRecycleView.setAdapter(homeAdapter);
}
}
public class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.MessageViewHolder> {
private Context context;
private ArrayList<DataModel> userMessagesList;
public NewsAdapter(Context context, ArrayList<DataModel> userMessageList) {
this.context = context;
this.userMessagesList = userMessageList;
}
#NonNull
#Override
public MessageViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.news_feed_row, viewGroup, false);
return new MessageViewHolder(view);
}
//Loads data into views
#Override
public void onBindViewHolder(#NonNull MessageViewHolder viewHolder, int i) {
// viewHolder.senderTextView.setText(message.getMessage());
viewHolder.senderTextView.setText(userMessagesList.get(i).getName());
viewHolder.receiverTextView.setText(userMessagesList.get(i).getAge());
}
#Override
public int getItemCount() {
return userMessagesList.size();
}
//links up ui elements
static class MessageViewHolder extends RecyclerView.ViewHolder {
private TextView senderTextView, receiverTextView;
public MessageViewHolder(#NonNull View itemView) {
super(itemView);
senderTextView = itemView.findViewById(R.id.newsBody);
receiverTextView = itemView.findViewById(R.id.newsTitle);
}
}
}

Fragment with multiple Recycler Views freezes UI

I am creating a Fragment that has 5 horizontal recycler views under a vertical Scroll View but each time this fragment needs to be loaded, the UI freezes for about a second.
I have created an Adapter that sets the Data from 2 different POJOs into the different Recycler Views. I have found out that the line from my code which seems to be causing the issue is the setLayoutManager() because once commented, the fragment loading does not freeze the UI. Apart from that I haven't been able to find out why is that happening when assigning the LayoutManger to the recycler view and what could I do to improve the fragment's performance.
Here is the fragment_home.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.entertainment.logicaldays.planetmovie.views.fragments.HomeFragment"
android:id="#+id/layout"
android:background="#color/colorPrimary">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/scroll_view">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="200dp"
android:id="#+id/view_pager"
android:layout_marginBottom="5dp">
</android.support.v4.view.ViewPager>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recycler_popular_movies"
android:orientation="horizontal">
</android.support.v7.widget.RecyclerView>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recycler_upcoming_movies"
android:orientation="horizontal">
</android.support.v7.widget.RecyclerView>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recycler_top_rated_movies"
android:orientation="horizontal">
</android.support.v7.widget.RecyclerView>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recycler_popular_tv_shows"
android:orientation="horizontal">
</android.support.v7.widget.RecyclerView>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/recycler_top_rated_tv_shows"
android:orientation="horizontal">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
</ScrollView>
</FrameLayout>
Then I have the recycler_item.xml to bind to the Recycler Views:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="5dp">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_gravity="center">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/hover_values">
<ImageView
android:layout_width="wrap_content"
android:layout_height="150dp"
android:src="#drawable/ic_launcher_background"
android:layout_gravity="center|top"
android:id="#+id/recycler_image" />
<ImageView
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentTop="true"
android:layout_marginTop="20dp"
android:alpha="0"
android:id="#+id/poster_hover_image"
android:layout_centerHorizontal="true"
android:src="#drawable/star"/>
<TextView
android:layout_marginTop="5dp"
android:alpha="0"
android:id="#+id/poster_hover_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/poster_hover_image"
android:fontFamily="#font/theboldfont"
android:layout_centerHorizontal="true" />
</RelativeLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAlignment="center"
android:scrollHorizontally="true"
android:minLines="2"
android:maxLines="2"
android:ellipsize="end"
android:id="#+id/recycler_title"/>
</LinearLayout>
</LinearLayout>
The Adapter which can bind 2 different POJOs into the Recycler Views:
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{
public Object pojo;
public Context context;
public RecyclerViewAdapter(Context ctx, Object movies) {
this.pojo = movies;
this.context = ctx;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false);
final ValueAnimator animatorPosterTint = ValueAnimator.ofInt(0, 180);
final ValueAnimator animatorHoverOpacity = ValueAnimator.ofFloat(0, 1);
//When long-pressing the Movie
view.setOnLongClickListener(new LongClickOnPosterItemListerner(view, animatorPosterTint, animatorHoverOpacity));
//When releasing the touch on the movie
view.setOnTouchListener(new ReleasePosterItemListener(view, animatorPosterTint, animatorHoverOpacity));
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
if(pojo instanceof MovieList) {
holder.title.setText(((MovieList)pojo).results.get(position).title);
Glide.with(context)
.asBitmap()
.load(Utils.BASE_TMDB_POSTER_URL + ((MovieList)pojo).results.get(position).posterPath)
.into(holder.image);
holder.rating.setText(Float.toString(((MovieList)pojo).results.get(position).voteAverage));
}
else{
holder.title.setText(((TVList)pojo).results.get(position).name);
Glide.with(context)
.asBitmap()
.load(Utils.BASE_TMDB_POSTER_URL + ((TVList)pojo).results.get(position).posterPath)
.into(holder.image);
holder.rating.setText(Float.toString(((TVList)pojo).results.get(position).voteAverage));
}
}
#Override
public int getItemCount() {
int count = 0;
if(pojo instanceof MovieList && ((MovieList)pojo).results != null) {
if (((MovieList)pojo).results != null) {
count = ((MovieList)pojo).results.size();
}
}
else{
if (((TVList)pojo).results != null) {
count = ((TVList)pojo).results.size();
}
}
return count;
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView image;
TextView title;
TextView rating;
public ViewHolder(View itemView) {
super(itemView);
image = itemView.findViewById(R.id.recycler_image);
title = itemView.findViewById(R.id.recycler_title);
rating = itemView.findViewById(R.id.poster_hover_text);
}
}
}
And finally we have the HomeFragment.java
public class HomeFragment extends Fragment {
public MainActivity mainActivity;
#BindView(R.id.recycler_popular_movies)
RecyclerView recyclerPopularMovies;
#BindView(R.id.recycler_upcoming_movies)
RecyclerView recyclerUpcomingMovies;
#BindView(R.id.recycler_top_rated_movies)
RecyclerView recyclerTopRatedMovies;
#BindView(R.id.recycler_popular_tv_shows)
RecyclerView recyclerPopularTVShows;
#BindView(R.id.recycler_top_rated_tv_shows)
RecyclerView recyclerTopRatedTVShows;
#BindView(R.id.view_pager)
ViewPager viewPager;
LinkedHashMap<Utils.RequestsToLoad, Boolean> requestsToLoad;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mainActivity = (MainActivity) getActivity();
// Inflate the layout into the Fragment
View v = inflater.inflate(R.layout.fragment_home, container, false);
ButterKnife.bind(this, v);
startViewPager();
startRecyclerViews();
return v;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
private void startRecyclerViews(){
displayRecyclerView(recyclerPopularMovies, mainActivity.popularMovies);
displayRecyclerView(recyclerTopRatedMovies, mainActivity.upcomingMovies);
displayRecyclerView(recyclerUpcomingMovies, mainActivity.topRatedMovies);
displayRecyclerView(recyclerPopularTVShows, mainActivity.popularTVShow);
displayRecyclerView(recyclerTopRatedTVShows, mainActivity.topRatedTVShow);
}
private void displayRecyclerView(RecyclerView recyclerView, Object object){
LinearLayoutManager layoutManager = new LinearLayoutManager(mainActivity, LinearLayoutManager.HORIZONTAL, false);
final RecyclerViewAdapter adapter = new RecyclerViewAdapter(getActivity(), object);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(layoutManager);
}
private void startViewPager(){
SwipeAdapter swipeAdapter = new SwipeAdapter(getActivity(), mainActivity.upcomingMovies);
viewPager.setAdapter(swipeAdapter);
}
}
As said before, is there anything that could be causing that delay to load the fragment so that I can improve it?
Thanks in advance

StaggeredGridLayoutManager changing item size on scroll

I am searching for a long time on net. But no use. Please help or try to give some ideas how to solve this problem.
1. Bug Description
image link：https://i.stack.imgur.com/ixvdB.jpg
"left"：Run the apk
"Right"：When I swipe down, the size of the items is changing.
2. Code
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
List<Member> memberList = new ArrayList<>();
memberList.add(new Member(1, R.drawable.baishatunbeach1, "白沙屯海灘1"));
//add Members
recyclerView.setAdapter(new MemberAdapter(this, memberList));
}
private class MemberAdapter extends RecyclerView.Adapter<MemberAdapter.ViewHolder> {
private Context context;
private List<Member> memberList;
MemberAdapter(Context context, List<Member> memberList) {
this.context = context;
this.memberList = memberList;
}
#Override
public MemberAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.recyclerview_cardview_item, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(MemberAdapter.ViewHolder holder, int position) {
final Member member = memberList.get(position);
holder.imageId.setImageResource(member.getImage());
holder.textId.setText(String.valueOf(member.getId()));
holder.textName.setText(member.getName());
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ImageView imageView = new ImageView(context);
imageView.setImageResource(member.getImage());
Toast toast = new Toast(context);
toast.setView(imageView);
toast.setDuration(Toast.LENGTH_SHORT);
toast.show();
}
});
}
#Override
public int getItemCount() {
return memberList.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
ImageView imageId;
TextView textId, textName;
ViewHolder(View itemView) {
super(itemView);
imageId = (ImageView) itemView.findViewById(R.id.imageId);
textId = (TextView) itemView.findViewById(R.id.textId);
textName = (TextView) itemView.findViewById(R.id.textName);
}
}
}
}
activity_main.xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
recyclerview_cardview_item.xml
<android.support.v7.widget.CardView
android:id="#+id/cardview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="6dp"
android:padding="6dp"
app:cardBackgroundColor="#ffdddddd"
app:cardCornerRadius="28dp"
app:cardElevation="6dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/imageId"
android:layout_width="120dp"
android:layout_height="160dp"
android:layout_marginStart="16dp" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:id="#+id/textId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="12dp"
android:layout_marginStart="20dp" />
<TextView
android:id="#+id/textName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="12dp"
android:layout_marginStart="24dp" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>

You need to change the height of cardview and linearlayout to wrap_content
<android.support.v7.widget.CardView
android:id="#+id/cardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="6dp"
android:padding="6dp"
app:cardBackgroundColor="#ffdddddd"
app:cardCornerRadius="28dp"
app:cardElevation="6dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

onCreateViewHolder not called RecyclerView

I am using Recyclerview and my onCreateViewHolder and onBindViewHolder are not called. I am getting the data but it is not displaying.
My adapter class
public class DishesAdapter extends RecyclerView.Adapter<DishesAdapter.MyViewHolder> {
private Context mContext;
List<List> DialogList = new ArrayList<List>();
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView dishnames;
public RatingBar dishratings;
public ImageView dishimages;
private ImageLoader mLoader;
public MyViewHolder(View view) {
super(view);
Log.d("follower2","hi");
dishnames = (TextView)view.findViewById(R.id.dishname);
dishimages = (ImageView)view.findViewById(R.id.dishimage);
dishratings=(RatingBar)view.findViewById(R.id.dishrating);
}
}
public DishesAdapter(Context mContext, List objects) {
super();
Log.d("follower1","hi");
this.mContext = mContext;
this.DialogList = objects;
Log.d("follower1",objects.toString());
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(mContext)
.inflate(R.layout.recipe_list, parent, false);
Log.d("follower","hi");
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
final int i=position;
Log.d("follower","hi");
List dialog = DialogList.get(i);
Log.d("follower",dialog.toString());
String dishid = dialog.get(0).toString();
final String dishname = dialog.get(1).toString();
//byte[] dishimage = Base64.decode(dialog.get(2).toString(), Base64.DEFAULT);
String dishimage=dialog.get(2).toString();
String rating=dialog.get(3).toString();
holder.dishnames.setText(dishname);
holder.dishratings.setRating(Float.parseFloat(rating));
holder.mLoader.DisplayImage(dishimage.replaceAll(" ", "%20"),holder.dishimages);
}
#Override
public int getItemCount() {
return DialogList.size();
}}
Recyclerview
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(mLayoutManager);
xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:tools="http://schemas.android.com/tools"
tools:context="mealplanner.com.main.mealplanner.MainActivity"
>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:scrollbars="vertical" />
</LinearLayout>
Row List
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FFFFFF"
card_view:cardUseCompatPadding="true"
card_view:cardElevation="4dp"
card_view:cardCornerRadius="3dp"
android:id="#+id/cv">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<ImageView
android:id="#+id/dishimage"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_marginRight="6dip"
android:adjustViewBounds="true"
android:scaleType="fitXY"
android:layout_margin="10dp"
android:src="#drawable/portraitlanding"
/>
<TextView
android:id="#+id/dishname"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="40dp"
android:layout_toRightOf="#+id/dishimage"
android:textColor="#000000"
android:textSize="20dp"
android:layout_gravity="center"
android:text="Andrew" />
<RatingBar
android:id="#+id/dishrating"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="?android:attr/ratingBarStyleSmall"
android:isIndicator="true"
android:numStars="5"
android:stepSize="0.1"
android:layout_marginTop="10dp"
android:layout_gravity="center"
android:layout_below="#+id/dishname"
android:layout_toRightOf="#+id/dishimage"
/>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
DishesAdapter constructor is being called. I am getting follower1 log along with the list of items.

Next item appearing after scolling in RecyclerView

I have created RecyclerView. When it renders on screen it shows only one item per screen. I can see next item when I scroll down RecyclerView. Here is my code
public class LeaveStatusViewAdapter extends RecyclerView
.Adapter<LeaveStatusViewAdapter
.DataObjectHolder> {
private static String LOG_TAG = "MyRecyclerViewAdapter";
private ArrayList<Employee> mDataset;
private static MyClickListener myClickListener;
public static class DataObjectHolder extends RecyclerView.ViewHolder
implements View
.OnClickListener {
TextView startDate;
TextView endDate;
TextView leaveType;
TextView leaveDays;
TextView leaveReason;
TextView leaveStatus;
public DataObjectHolder(View itemView) {
super(itemView);
startDate = (TextView) itemView.findViewById(R.id.textView_StartDate);
endDate = (TextView) itemView.findViewById(R.id.textView_EndDate);
leaveType = (TextView) itemView.findViewById(R.id.textView_LeaveType);
leaveDays = (TextView) itemView.findViewById(R.id.textView_LeaveDays);
leaveReason = (TextView) itemView.findViewById(R.id.textView_LeaveReason);
leaveStatus = (TextView) itemView.findViewById(R.id.textView_LeaveStatus);
Log.i(LOG_TAG, "Adding Listener");
itemView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
myClickListener.onItemClick(getAdapterPosition(), v);
}
}
public void setOnItemClickListener(MyClickListener myClickListener) {
this.myClickListener = myClickListener;
}
public LeaveStatusViewAdapter(ArrayList<Employee> myDataset) {
mDataset = myDataset;
}
#Override
public DataObjectHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_view_row, parent, false);
DataObjectHolder dataObjectHolder = new DataObjectHolder(view);
return dataObjectHolder;
}
#Override
public void onBindViewHolder(DataObjectHolder holder, int position) {
holder.startDate.setText(mDataset.get(position).getLeaveStartDate());
holder.endDate.setText(mDataset.get(position).getLeavesEndDate());
holder.leaveType.setText(mDataset.get(position).getLeaveType());
holder.leaveDays.setText(mDataset.get(position).getLeaveDays());
holder.leaveReason.setText(mDataset.get(position).getLeaveReason());
holder.leaveStatus.setText(mDataset.get(position).getLeaveStatus());
}
public void addItem(Employee dataObj, int index) {
mDataset.add(index, dataObj);
notifyItemInserted(index);
}
public void deleteItem(int index) {
mDataset.remove(index);
notifyItemRemoved(index);
}
#Override
public int getItemCount() {
return mDataset.size();
}
public interface MyClickListener {
public void onItemClick(int position, View v);
}
}
Following is activity class
public class LeaveStatusActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private static String LOG_TAG = "CardViewActivity";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_leave_status);
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new LeaveStatusViewAdapter(getDataSet());
mRecyclerView.setAdapter(mAdapter);
}
#Override
protected void onResume() {
super.onResume();
((LeaveStatusViewAdapter) mAdapter).setOnItemClickListener(new LeaveStatusViewAdapter
.MyClickListener() {
#Override
public void onItemClick(int position, View v) {
Log.i(LOG_TAG, " Clicked on Item " + position);
}
});
}
private ArrayList<Employee> getDataSet() {
ArrayList results = new ArrayList<Employee>();
for (int index = 0; index < 3; index++) {
Employee obj = new Employee(" : 15/07/2016",
" : 20/07/2016"," : EL: Earned Leave"," : 5"," : Not feeeling well"," : Pending");
results.add(index, obj);
}
return results;
}
}
Following is Layout files
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.leave.mcgm.mcgmleavemanagement.LeaveStatusActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"/>
</LinearLayout>
Following custom view for each item in RecyclerView
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.CardView
android:id="#+id/card_view"
android:layout_gravity="center"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/lbl_StartDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_alignParentTop="true"
android:text="Start Date"/>
<TextView
android:id="#+id/textView_StartDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toEndOf="#+id/lbl_StartDate" />
<TextView
android:id="#+id/lbl_EndDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End Date"
android:textStyle="bold"
android:layout_marginStart="24dp"
android:layout_alignParentTop="true"
android:layout_toEndOf="#+id/textView_LeaveReason" />
<TextView
android:id="#+id/textView_EndDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/lbl_EndDate"
android:layout_alignBottom="#+id/lbl_EndDate"
android:layout_toEndOf="#+id/lbl_EndDate" />
<TextView
android:id="#+id/lbl_LeaveType"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:text="LeaveType"
android:layout_below="#+id/lbl_EndDate"
android:layout_alignParentStart="true"
android:textStyle="bold"/>
<TextView
android:id="#+id/textView_LeaveType"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:text=""
android:layout_alignBaseline="#+id/lbl_LeaveType"
android:layout_alignBottom="#+id/lbl_LeaveType"
android:layout_toEndOf="#+id/lbl_LeaveType" />
<TextView
android:id="#+id/lbl_LeaveDays"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Leave Days"
android:singleLine="true"
android:layout_below="#+id/lbl_EndDate"
android:layout_alignStart="#+id/lbl_EndDate"
android:textStyle="bold"/>
<TextView
android:id="#+id/textView_LeaveDays"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:text=""
android:layout_alignBaseline="#+id/lbl_LeaveDays"
android:layout_alignBottom="#+id/lbl_LeaveDays"
android:layout_toEndOf="#+id/lbl_LeaveDays" />
<TextView
android:id="#+id/lbl_LeaveReason"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Leave Reason"
android:singleLine="true"
android:layout_alignTop="#+id/textView_LeaveReason"
android:layout_alignParentStart="true"
android:textStyle="bold"/>
<TextView
android:id="#+id/textView_LeaveReason"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:text=""
android:layout_below="#+id/textView_LeaveDays"
android:layout_toEndOf="#+id/lbl_LeaveReason" />
<TextView
android:id="#+id/lbl_LeaveStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Leave Status"
android:singleLine="true"
android:layout_alignBaseline="#+id/textView_LeaveStatus"
android:layout_alignBottom="#+id/textView_LeaveStatus"
android:layout_alignParentStart="true"
android:textStyle="bold"/>
<TextView
android:id="#+id/textView_LeaveStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:text=""
android:layout_below="#+id/lbl_LeaveReason"
android:layout_toEndOf="#+id/lbl_LeaveReason"
android:textAllCaps="true"/>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
Am I missing something here??

You should change the view of each element of the list to android:layout_height="wrap_content"
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.CardView
android:id="#+id/card_view"
android:layout_gravity="center"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">
.....
</LinearLayout>
When you use android:layout_height="match_parent" every item of the list will try to use the maximum space possible in the screen