Recyclerview and handling different type of row inflation

Question

I m trying to work with the new RecyclerView  but I could not find an example of a RecyclerView with different types of rows cardviews getting inflated   With ListView I override the getViewTypeCount and getItemViewType  for handling different types of rows   Am I supposed to do it like the  old  way or should I do something with LayoutManager  I was wondering if someone could point me to the right direction  Because I can only find examples with one type   I want to have a list of slightly different cards  Or should I just use a scrollView with cardViews inside of it   make it without the adapter and recyclerView

User · Answer

You can use the library  https   github com vivchar RendererRecyclerViewAdapter  mRecyclerViewAdapter   new RendererRecyclerViewAdapter       included from library    mRecyclerViewAdapter registerRenderer new SomeViewRenderer SomeModel TYPE  this    mRecyclerViewAdapter registerRenderer          you can use several types of cells      For each item  you should to implement a ViewRenderer  ViewHolder  SomeModel   ViewHolder - it is a simple view holder of recycler view   SomeModel - it is your model with ItemModel interface  public class SomeViewRenderer extends ViewRenderer lt SomeModel  SomeViewHolder gt         public SomeViewRenderer final int type  final Context context            super type  context               Override     public void bindView  NonNull final SomeModel model   NonNull final SomeViewHolder holder           holder mTitle setText model getTitle                 NonNull      Override     public SomeViewHolder createViewHolder  Nullable final ViewGroup parent            return new SomeViewHolder LayoutInflater from getContext    inflate R layout some item  parent  false              For more details you can look documentations

User · Answer

The trick is to create subclasses of ViewHolder and then cast them   public class GroupViewHolder extends RecyclerView ViewHolder       TextView mTitle      TextView mContent      public GroupViewHolder View itemView            super  itemView              init views             public class ImageViewHolder extends RecyclerView ViewHolder       ImageView mImage      public ImageViewHolder View itemView            super  itemView              init views             private static final int TYPE IMAGE   1  private static final int TYPE GROUP   2      And then  at runtime do something like this    Override public int getItemViewType int position           here your custom logic to choose the view type     return position    0   TYPE IMAGE   TYPE GROUP      Override public void onBindViewHolder  ViewHolder viewHolder  int i         switch  viewHolder getItemViewType               case TYPE IMAGE              ImageViewHolder imageViewHolder    ImageViewHolder  viewHolder              imageViewHolder mImage setImageResource                   break           case TYPE GROUP              GroupViewHolder groupViewHolder    GroupViewHolder  viewHolder              groupViewHolder mContent setText                  groupViewHolder mTitle setText                   break            Hope it helps

User · Answer

According to Gil great answer I solved by Overriding the getItemViewType as explained by Gil  His answer is great and have to be marked as correct  In any case  I add the code to reach the score   In your recycler adapter    Override public int getItemViewType int position        int viewType   0         add here your booleans or switch   to set viewType at your needed        I E if  position    0  viewType   1  etc  etc      return viewType      Override public FileViewHolder onCreateViewHolder ViewGroup parent  int viewType        if  viewType    0            return new MyViewHolder LayoutInflater from parent getContext    inflate R layout my layout for first row  parent  false               return new MyViewHolder LayoutInflater from parent getContext    inflate R layout my other rows  parent  false        By doing this  you can set whatever custom layout for whatever row

User · Answer

It is quite tricky but that much hard  just copy the below code and you are done  package com yuvi sample main   import android content Context  import android support v7 widget RecyclerView  import android util Log  import android view LayoutInflater  import android view View  import android view ViewGroup  import android widget ImageView  import android widget TextView    import com yuvi sample R   import java util List          Created by yubraj on 6 17 15       public class NavDrawerAdapter extends RecyclerView Adapter lt NavDrawerAdapter MainViewHolder gt        List lt MainOption gt  mainOptionlist      Context context      private static final int TYPE PROFILE   1      private static final int TYPE OPTION MENU   2      private int selectedPos   0      public NavDrawerAdapter Context context           this mainOptionlist   MainOption getDrawableDataList            this context   context              Override     public int getItemViewType int position            return  position    0  TYPE PROFILE   TYPE OPTION MENU               Override     public MainViewHolder onCreateViewHolder ViewGroup parent  int viewType            switch  viewType               case TYPE PROFILE                  return new ProfileViewHolder LayoutInflater from context  inflate R layout row profile  parent  false                case TYPE OPTION MENU                  return new MyViewHolder LayoutInflater from context  inflate R layout row nav drawer  parent  false                      return null              Override     public void onBindViewHolder MainViewHolder holder  int position            if holder getItemViewType      TYPE PROFILE               ProfileViewHolder mholder    ProfileViewHolder  holder              setUpProfileView mholder                     else               MyViewHolder mHolder    MyViewHolder  holder              MainOption mo   mainOptionlist get position               mHolder tv title setText mo title               mHolder iv icon setImageResource mo icon               mHolder itemView setSelected selectedPos    position                        private void setUpProfileView ProfileViewHolder mholder                 Override     public int getItemCount             return mainOptionlist size              public class MyViewHolder extends MainViewHolder      TextView tv title      ImageView iv icon       public MyViewHolder View v           super v           this tv title    TextView  v findViewById R id tv title           this iv icon    ImageView  v findViewById R id iv icon           v setOnClickListener new View OnClickListener                  Override             public void onClick View v                       Redraw the old selection and the new                 notifyItemChanged selectedPos                   selectedPos   getLayoutPosition                    notifyItemChanged selectedPos                                         public class ProfileViewHolder extends MainViewHolder          TextView tv name  login          ImageView iv profile           public ProfileViewHolder View v               super v               this tv name    TextView  v findViewById R id tv profile               this iv profile    ImageView  v findViewById R id iv profile               this login    TextView  v findViewById R id tv login                        public void trace String tag  String message           Log d tag   message             public class MainViewHolder extends  RecyclerView ViewHolder           public MainViewHolder View v                super v                         enjoy

User · Answer

You can use this library  https   github com kmfish MultiTypeListViewAdapter  written by me    Better reuse the code of one cell Better expansion Better decoupling   Setup adapter   adapter   new BaseRecyclerAdapter    adapter registerDataAndItem TextModel class  LineListItem1 class   adapter registerDataAndItem ImageModel class  LineListItem2 class   adapter registerDataAndItem AbsModel class  AbsLineItem class     For each line item   public class LineListItem1 extends BaseListItem lt TextModel  LineListItem1 OnItem1ClickListener gt         TextView tvName      TextView tvDesc         Override     public int onGetLayoutRes             return R layout list item1              Override     public void bindViews View convertView            Log d  item1    bindViews     convertView           tvName    TextView  convertView findViewById R id text name           tvDesc    TextView  convertView findViewById R id text desc            tvName setOnClickListener new View OnClickListener                  Override             public void onClick View v                    if  null    attachInfo                        attachInfo onNameClick getData                                                         tvDesc setOnClickListener new View OnClickListener                  Override             public void onClick View v                    if  null    attachInfo                        attachInfo onDescClick getData                                                              Override     public void updateView TextModel model  int pos            if  null    model                Log d  item1    updateView model     model    pos     pos               tvName setText model getName                 tvDesc setText model getDesc                          public interface OnItem1ClickListener           void onNameClick TextModel model           void onDescClick TextModel model

User · Answer

getItemViewType int position  is the key     In my opinion the starting point to create this kind of recyclerView   is the knowledge of this method  Since this method is optional to   override therefore it is not visible in RecylerView class by default   which in turn makes many developers including me  wonder where to   begin  Once you know that this method exists  creating such   RecyclerView would be a cakewalk      How to do it    You can create a RecyclerView with any number of different Views ViewHolders   But for better readability lets take an example of RecyclerView with two Viewholders  Remember these 3 simple steps and you will be good to go     Override public int getItemViewType int position  Return different ViewHolders based on the ViewType in onCreateViewHolder   method Populate View based on the itemViewType in onBindViewHolder   method  Here is a code snippet for you   public class YourListAdapter extends RecyclerView Adapter lt RecyclerView ViewHolder gt         private static final int LAYOUT ONE  0      private static final int LAYOUT TWO  1        Override     public int getItemViewType int position                if position  0             return LAYOUT ONE          else            return LAYOUT TWO              Override     public RecyclerView ViewHolder onCreateViewHolder ViewGroup parent  int viewType             View view  null          RecyclerView ViewHolder viewHolder   null           if viewType  LAYOUT ONE                       view   LayoutInflater from parent getContext    inflate R layout one parent false              viewHolder   new ViewHolderOne view                     else                      view   LayoutInflater from parent getContext    inflate R layout two parent false              viewHolder  new ViewHolderTwo view                      return viewHolder              Override     public void onBindViewHolder RecyclerView ViewHolder holder  final int position            if holder getItemViewType     LAYOUT ONE                         Typecast Viewholder                Set Viewholder properties                Add any click listener if any                  else               ViewHolderOne vaultItemHolder    ViewHolderOne  holder             vaultItemHolder name setText displayText              vaultItemHolder name setOnClickListener new View OnClickListener                     Override                public void onClick View v                                                                                                      VIEW HOLDER 1                          public class ViewHolderOne extends RecyclerView ViewHolder           public TextView name          public ViewHolderOne View itemView           super itemView          name    TextView itemView findViewById R id displayName                                         VIEW HOLDER 2                         public class ViewHolderTwo extends RecyclerView ViewHolder          public ViewHolderTwo View itemView           super itemView                     Do something                   GitHub Code   Here is a project where I have implemented a RecyclerView with multiple ViewHolders

User · Answer

We can achieve multiple view on single RecyclerView from below way  -  Dependencies on Gradle so add below code -  compile  com android support cardview-v7 23 0 1  compile  com android support recyclerview-v7 23 0 1    RecyclerView in XML   lt android support v7 widget RecyclerView         android id    id recyclerView          android layout width  match parent          android layout height  match parent   gt    Activity Code  private RecyclerView mRecyclerView  private CustomAdapter mAdapter  private RecyclerView LayoutManager mLayoutManager  private String   mDataset       Data - one         Data - two                Showing data three        Showing data four      private int mDatasetTypes      DataOne  DataTwo  DataThree     view types           mRecyclerView    RecyclerView  findViewById R id recyclerView   mLayoutManager   new LinearLayoutManager MainActivity this   mRecyclerView setLayoutManager mLayoutManager     Adapter is created in the last step mAdapter   new CustomAdapter mDataset  mDataSetTypes   mRecyclerView setAdapter mAdapter     First XML   lt  xml version  1 0  encoding  utf-8   gt   lt android support v7 widget CardView xmlns android  http   schemas android com apk res android          xmlns card view  http   schemas android com apk res-auto          android id    id cardview          android layout width  match parent          android layout height  wrap content          android layout marginTop   dimen ten          android elevation   dimen hundered            card view cardBackgroundColor     color black    gt              lt LinearLayout                 android layout width  match parent                  android layout height  wrap content                  android orientation  vertical                  android padding     dimen ten  gt                      lt TextView                         android layout width  wrap content                          android layout height  wrap content                          android text    Fisrt                            android textColor     color white      gt                      lt TextView                         android id    id temp                          android layout width  wrap content                          android layout height  wrap content                          android layout marginTop   dimen ten                          android textColor   color white                          android textSize  30sp    gt           lt  LinearLayout gt      lt  android support v7 widget CardView gt    Second XML   lt  xml version  1 0  encoding  utf-8   gt   lt android support v7 widget CardView xmlns android  http   schemas android com apk res android          xmlns card view  http   schemas android com apk res-auto          android id    id cardview          android layout width  match parent          android layout height  wrap content          android layout marginTop   dimen ten          android elevation  100dp          card view cardBackgroundColor   00bcd4  gt              lt LinearLayout                 android layout width  match parent                  android layout height  wrap content                  android orientation  vertical                  android padding   dimen ten  gt                      lt TextView                         android layout width  wrap content                          android layout height  wrap content                          android text    DataTwo                            android textColor   color white    gt                      lt TextView                         android id    id score                          android layout width  wrap content                          android layout height  wrap content                          android layout marginTop   dimen ten                          android textColor   ffffff                          android textSize  30sp    gt           lt  LinearLayout gt      lt  android support v7 widget CardView gt    Third XML   lt  xml version  1 0  encoding  utf-8   gt   lt android support v7 widget CardView xmlns android  http   schemas android com apk res android          xmlns card view  http   schemas android com apk res-auto          android id    id cardview          android layout width  match parent          android layout height  wrap content          android layout marginTop   dimen ten          android elevation  100dp          card view cardBackgroundColor   color white  gt              lt LinearLayout                 android layout width  match parent                  android layout height  wrap content                  android orientation  vertical                  android padding   dimen ten  gt                      lt TextView                         android layout width  wrap content                          android layout height  wrap content                          android text    DataThree      gt                      lt TextView                         android id    id headline                          android layout width  wrap content                          android layout height  wrap content                          android layout marginTop   dimen ten                          android textSize  25sp    gt                      lt Button                         android layout width  match parent                          android layout height  wrap content                          android layout marginTop   dimen ten                          android id    id read more                          android background   color white                          android text    Show More      gt           lt  LinearLayout gt      lt  android support v7 widget CardView gt    Now time to make adapter and this is main for showing different -2 view on same recycler view so please check this code focus fully  -  public class CustomAdapter extends RecyclerView Adapter lt CustomAdapter ViewHolder gt            private static final String TAG    CustomAdapter              private String   mDataSet          private int   mDataSetTypes             public static final int dataOne   0          public static final int dataTwo   1          public static final int dataThree   2                public static class ViewHolder extends RecyclerView ViewHolder                   public ViewHolder View v                            super v                                          public class DataOne extends ViewHolder                   TextView temp                     public DataOne View v                            super v                           this temp    TextView  v findViewById R id temp                                          public class DataTwo extends ViewHolder                   TextView score                     public DataTwo View v                            super v                           this score    TextView  v findViewById R id score                                          public class DataThree extends ViewHolder                   TextView headline                  Button read more                     public DataThree View v                            super v                           this headline    TextView  v findViewById R id headline                           this read more    Button  v findViewById R id read more                                             public CustomAdapter String   dataSet  int   dataSetTypes                    mDataSet   dataSet                  mDataSetTypes   dataSetTypes                        Override         public ViewHolder onCreateViewHolder ViewGroup viewGroup  int viewType                    View v                  if  viewType    dataOne                            v   LayoutInflater from viewGroup getContext                                             inflate R layout weather card  viewGroup  false                              return new DataOne v                     else if  viewType    dataTwo                            v   LayoutInflater from viewGroup getContext                                             inflate R layout news card  viewGroup  false                           return new DataThree v                     else                           v   LayoutInflater from viewGroup getContext                                             inflate R layout score card  viewGroup  false                           return new DataTwo v                                           Override         public void onBindViewHolder ViewHolder viewHolder  final int position                    if  viewHolder getItemViewType      dataOne                            DataOne holder    DataOne  viewHolder                          holder temp setText mDataSet position                                      else if  viewHolder getItemViewType      dataTwo                            DataThree holder    DataTwo  viewHolder                          holder headline setText mDataSet position                                      else                           DataTwo holder    DataTwo  viewHolder                          holder score setText mDataSet position                                            Override         public int getItemCount                     return mDataSet length                     Override         public int getItemViewType int position                    return mDataSetTypes position                 You can check also this link for more information

User · Answer

You have to implement getItemViewType   method in RecyclerView Adapter  By default onCreateViewHolder ViewGroup parent  int viewType  implementation viewType of this method returns 0  Firstly you need view type of the item at position for the purposes of view recycling and for that you have to override getItemViewType   method in which you can pass viewType which will return your position of item  Code sample is given below   Override public MyViewholder onCreateViewHolder ViewGroup parent  int viewType        int listViewItemType   getItemViewType viewType       switch  listViewItemType             case 0  return new ViewHolder0                case 2  return new ViewHolder2                 Override public int getItemViewType int position           return position        and in the similar way you can set data according     to view holder position by passing position in getItemViewType  Override public void onBindViewHolder MyViewholder viewholder  int position        int listViewItemType   getItemViewType position

User · Answer

Handling the rows   sections logic similar to iOS s UITableView is not as simple in Android as it is in iOS  however  when you use RecyclerView - the flexibility of what you can do is far greater   In the end  it s all about how you figure out what type of view you re displaying in the Adapter  Once you got that figured out  it should be easy sailing  not really  but at least you ll have that sorted    The Adapter exposes two methods which you should override   getItemViewType int position    This method s default implementation will always return 0  indicating that there is only 1 type of view  In your case  it is not so  and so you will need find a way to assert which row corresponds to which view type  Unlike iOS  which manages this for you with rows and sections  here you will have only one index to rely on  and you ll need to use your developer skills to know when a position correlates to a section header  and when it correlates to a normal row   createViewHolder ViewGroup parent  int viewType    You need to override this method anyway  but usually people just ignore the viewType parameter  According to the view type  you ll need to inflate the correct layout resource and create your view holder accordingly  The RecyclerView will handle recycling different view types in a way which avoids clashing of different view types   If you re planning on using a default LayoutManager  such as LinearLayoutManager  you should be good to go  If you re planning on making your own LayoutManager implementation  you ll need to work a bit harder  The only API you really have to work with is findViewByPosition int position  which gives a given view at a certain position  Since you ll probably want to lay it out differently depending on what type this view is  you have a few options    Usually when using the ViewHolder pattern  you set the view s tag with the view holder  You could use this during runtime in the layout manager to find out what type the view is by adding a field in the view holder which expresses this  Since you ll need a function which determines which position correlates to which view type  you might as well make this method globally accessible somehow  maybe a singleton class which manages the data    and then you can simply query the same method according to the position    Here s a code sample      in this sample  I use an object array to simulate the data of the list      I assume that if the object is a String  it means I should display a header with a basic title     If not  I assume it s a custom model object I created which I will use to bind my normal rows  private Object   myData   public static final int ITEM TYPE NORMAL   0  public static final int ITEM TYPE HEADER   1   public class MyAdapter extends Adapter lt ViewHolder gt          Override     public ViewHolder onCreateViewHolder ViewGroup parent  int viewType             if  viewType    ITEM TYPE NORMAL                View normalView   LayoutInflater from getContext    inflate R layout my normal row  null               return new MyNormalViewHolder normalView      view holder for normal items           else if  viewType    ITEM TYPE HEADER                View headerRow   LayoutInflater from getContext    inflate R layout my header row  null               return new MyHeaderViewHolder headerRow      view holder for header items                        Override     public void onBindViewHolder ViewHolder holder  int position             final int itemType   getItemViewType position            if  itemType    ITEM TYPE NORMAL                  MyNormalViewHolder holder  bindData  MyModel myData position              else if  itemType    ITEM TYPE HEADER                  MyHeaderViewHolder holder  setHeaderText  String myData position                          Override     public int getItemViewType int position            if  myData position  instanceof String                return ITEM TYPE HEADER            else               return ITEM TYPE NORMAL                        Override     public int getItemCount             return myData length            Here s a sample of how these view holders should look like   public MyHeaderViewHolder extends ViewHolder        private TextView headerLabel           public MyHeaderViewHolder View view            super view            headerLabel    TextView view findViewById R id headerLabel              public void setHeaderText String text            headerLabel setText text                 public MyNormalViewHolder extends ViewHolder        private TextView titleLabel      private TextView descriptionLabel           public MyNormalViewHolder View view            super view            titleLabel    TextView view findViewById R id titleLabel           descriptionLabel    TextView view findViewById R id descriptionLabel              public void bindData MyModel model            titleLabel setText model getTitle             descriptionLabel setText model getDescription                   Of course  this sample assumes you ve constructed your data source  myData  in a way that makes it easy to implement an adapter in this way  As an example  I ll show you how I d construct a data source which shows a list of names  and a header for every time the 1st letter of the name changes  assume the list is alphabetized  - similar to how a contacts list would look like      Assume names  amp  descriptions are non-null and have the same length     Assume names are alphabetized private void processDataSource String   names  String   descriptions        String nextFirstLetter           String currentFirstLetter       List lt Object gt  data   new ArrayList lt Object gt          for  int i   0  i  lt  names length  i              currentFirstLetter   names i  substring 0  1      get the 1st letter of the name             if the first letter of this name is different from the last one  add a header row         if   currentFirstLetter equals nextFirstLetter                 nextFirstLetter   currentFirstLetter              data add nextFirstLetter                      data add new MyModel names i   descriptions i                myData   data toArray        This example comes to solve a fairly specific issue  but I hope this gives you a good overview on how to handle different row types in a recycler  and allows you make the necessary adaptations in your own code to fit your needs

User · Answer

You can just return ItemViewType and use it  See below code    Override public int getItemViewType int position         Message item   messageList get position          return my message layout     if item getUsername      Message userEnum I          return R layout item message me      else         return R layout item message     return other message layout     Override public ViewHolder onCreateViewHolder ViewGroup viewGroup  int viewType        View view   LayoutInflater from viewGroup getContext    inflate viewType  viewGroup  false       return new ViewHolder view

[android] Recyclerview and handling different type of row inflation

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