Nested Recycler view height doesn t wrap its content

Question

I have an application that manage collections of books  like playlists    I want to display a list of collection with a vertical RecyclerView and inside each row  a list of book in an horizontal RecyclerView   When i set the layout height of the inner horizontal RecyclerView to 300dp  it is displayed correctly but when i set it to wrap content  it doesn t display anything  I need to use wrap content because I want to be able to change the layout manager programmatically to switch between vertical and horizontal display      Do you know what i m doing wrong    My Fragment layout      lt LinearLayout xmlns android  http   schemas android com apk res android                  android layout width  match parent                  android layout height  match parent                  android background   color white  gt        lt com twibit ui view CustomSwipeToRefreshLayout         android id    id swipe container          android layout width  match parent          android layout height  match parent  gt            lt LinearLayout             android layout width  match parent              android layout height  match parent              android orientation  vertical  gt                lt android support v7 widget RecyclerView                 android id    id shelf collection listview                  android layout width  match parent                  android layout height  match parent                  android paddingTop  10dp   gt            lt  LinearLayout gt        lt  com twibit ui view CustomSwipeToRefreshLayout gt   lt  LinearLayout gt    Collection element layout      lt LinearLayout xmlns android  http   schemas android com apk res android                android layout width  match parent                android layout height  wrap content                android orientation  vertical  gt        lt RelativeLayout xmlns android  http   schemas android com apk res android                      android layout width  match parent                      android layout height  wrap content                      android background   FFF  gt            lt  -- Simple Header -- gt        lt  RelativeLayout gt        lt FrameLayout         android layout width  match parent          android layout height  wrap content  gt            lt TextView             android layout width  match parent              android layout height  match parent              android text   string empty collection              android id    id empty collection tv              android visibility  gone              android gravity  center   gt            lt android support v7 widget RecyclerView             android id    id collection book listview              android layout width  match parent              android layout height  wrap content   gt   lt  -- android layout height  300dp  -- gt        lt  FrameLayout gt    lt  LinearLayout gt    Book list item     lt FrameLayout xmlns android  http   schemas android com apk res android                android layout width  180dp                android layout height  220dp                android layout gravity  center  gt            lt ImageView             android id    id shelf item cover              android layout width  wrap content              android layout height  wrap content              android layout gravity  center              android maxWidth  150dp              android maxHeight  200dp              android src   drawable placeholder              android contentDescription   string cover              android adjustViewBounds  true              android background   android drawable dialog holo light frame   gt    lt  FrameLayout gt    Here is my Collection Adapter     private class CollectionsListAdapter extends RecyclerView Adapter lt CollectionsListAdapter ViewHolder gt        private final String TAG   CollectionsListAdapter class getSimpleName        private Context mContext          Create the ViewHolder class to keep references to your views     class ViewHolder extends RecyclerView ViewHolder            private final TextView mHeaderTitleTextView          private final TextView mHeaderCountTextView           private final RecyclerView mHorizontalListView          private final TextView mEmptyTextView           public ViewHolder View view                super view                mHeaderTitleTextView    TextView  view findViewById R id collection header tv               mHeaderCountTextView    TextView  view findViewById R id collection header count tv                mHorizontalListView    RecyclerView  view findViewById R id collection book listview               mEmptyTextView    TextView  view findViewById R id empty collection tv                         public CollectionsListAdapter Context context            mContext   context               Override     public ViewHolder onCreateViewHolder ViewGroup parent  int i            Log d TAG   CollectionsListAdapter onCreateViewHolder     parent getId            i                    Create a new view by inflating the row item xml          View v   LayoutInflater from parent getContext    inflate R layout shelf collection  parent  false               Set the view to the ViewHolder         ViewHolder holder   new ViewHolder v            holder mHorizontalListView setHasFixedSize false           holder mHorizontalListView setHorizontalScrollBarEnabled true               use a linear layout manager         LinearLayoutManager mLayoutManager   new LinearLayoutManager mContext           mLayoutManager setOrientation LinearLayoutManager HORIZONTAL           holder mHorizontalListView setLayoutManager mLayoutManager            return holder              Override     public void onBindViewHolder ViewHolder holder  int i            Log d TAG   CollectionsListAdapter onBindViewHolder     holder getPosition            i                  Collection collection   mCollectionList get i           Log d TAG   Collection       collection getLabel              holder mHeaderTitleTextView setText collection getLabel             holder mHeaderCountTextView setText      collection getBooks   size                 Create an adapter if none exists         if   mBookListAdapterMap containsKey collection getCollectionId                   mBookListAdapterMap put collection getCollectionId    new BookListAdapter getActivity    collection                       holder mHorizontalListView setAdapter mBookListAdapterMap get collection getCollectionId                   Override     public int getItemCount             return mCollectionList size              And finally  the Book adapter    private class BookListAdapter extends RecyclerView Adapter lt BookListAdapter ViewHolder gt  implements View OnClickListener       private final String TAG   BookListAdapter class getSimpleName            Create the ViewHolder class to keep references to your views     class ViewHolder extends RecyclerView ViewHolder           public ImageView mCoverImageView           public ViewHolder View view                super view               mCoverImageView    ImageView  view findViewById R id shelf item cover                         Override     public void onClick View v            BookListAdapter ViewHolder holder    BookListAdapter ViewHolder  v getTag            int position   holder getPosition            final Book book   mCollection getBooks   get position               Click on cover image         if  v getId      holder mCoverImageView getId                  downloadOrOpenBook book               return                       private void downloadOrOpenBook final Book book               do stuff            private Context mContext      private Collection mCollection       public BookListAdapter Context context  Collection collection            Log d TAG   BookListAdapter     context          collection                 mCollection   collection          mContext   context              Override     public ViewHolder onCreateViewHolder ViewGroup parent  int i            Log d TAG   onCreateViewHolder     parent getId            i                    Create a new view by inflating the row item xml          View v   LayoutInflater from parent getContext    inflate R layout shelf grid item  parent  false               Set the view to the ViewHolder         ViewHolder holder   new ViewHolder v           holder mCoverImageView setOnClickListener BookListAdapter this      Download or Open          holder mCoverImageView setTag holder            return holder              Override     public void onBindViewHolder ViewHolder holder  int i            Log d TAG   onBindViewHolder     holder getPosition            i                  Book book   mCollection getBooks   get i            ImageView imageView   holder mCoverImageView          ImageLoader getInstance   displayImage book getCoverUrl    imageView               Override     public int getItemCount             return mCollection getBooks   size

User · Answer

Here I have found a solution  https   code google com p android issues detail id 74772   It is in no way my solution  I have just copied it from there  but I hope it will help someone as much as it helped me when implementing horizontal RecyclerView and wrap content height  should work also for vertical one and wrap content width   The solution is to extend the LayoutManager and override its onMeasure method as  yigit suggested   Here is the code in case the link dies   public static class MyLinearLayoutManager extends LinearLayoutManager        public MyLinearLayoutManager Context context            super context              private int   mMeasuredDimension   new int 2         Override     public void onMeasure RecyclerView Recycler recycler  RecyclerView State state                            int widthSpec  int heightSpec            final int widthMode   View MeasureSpec getMode widthSpec           final int heightMode   View MeasureSpec getMode heightSpec           final int widthSize   View MeasureSpec getSize widthSpec           final int heightSize   View MeasureSpec getSize heightSpec            measureScrapChild recycler  0                  View MeasureSpec makeMeasureSpec 0  View MeasureSpec UNSPECIFIED                   View MeasureSpec makeMeasureSpec 0  View MeasureSpec UNSPECIFIED                   mMeasuredDimension            int width   mMeasuredDimension 0           int height   mMeasuredDimension 1            switch  widthMode                case View MeasureSpec EXACTLY              case View MeasureSpec AT MOST                  width   widthSize                  break              case View MeasureSpec UNSPECIFIED                     switch  heightMode                case View MeasureSpec EXACTLY              case View MeasureSpec AT MOST                  height   heightSize                  break              case View MeasureSpec UNSPECIFIED                     setMeasuredDimension width  height              private void measureScrapChild RecyclerView Recycler recycler  int position  int widthSpec                                     int heightSpec  int   measuredDimension            View view   recycler getViewForPosition position           if  view    null                RecyclerView LayoutParams p    RecyclerView LayoutParams  view getLayoutParams                int childWidthSpec   ViewGroup getChildMeasureSpec widthSpec                      getPaddingLeft     getPaddingRight    p width               int childHeightSpec   ViewGroup getChildMeasureSpec heightSpec                      getPaddingTop     getPaddingBottom    p height               view measure childWidthSpec  childHeightSpec               measuredDimension 0    view getMeasuredWidth                measuredDimension 1    view getMeasuredHeight                recycler recycleView view

User · Answer

user2302510 solution works not as good as you may expected  Full workaround for both orientations and dynamically data changes is    public class MyLinearLayoutManager extends LinearLayoutManager        public MyLinearLayoutManager Context context  int orientation  boolean reverseLayout               super context  orientation  reverseLayout              private int   mMeasuredDimension   new int 2         Override     public void onMeasure RecyclerView Recycler recycler  RecyclerView State state                            int widthSpec  int heightSpec            final int widthMode   View MeasureSpec getMode widthSpec           final int heightMode   View MeasureSpec getMode heightSpec           final int widthSize   View MeasureSpec getSize widthSpec           final int heightSize   View MeasureSpec getSize heightSpec           int width   0          int height   0          for  int i   0  i  lt  getItemCount    i                  measureScrapChild recycler  i                      View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                       View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                       mMeasuredDimension                if  getOrientation      HORIZONTAL                    width   width   mMeasuredDimension 0                   if  i    0                        height   mMeasuredDimension 1                                   else                   height   height   mMeasuredDimension 1                   if  i    0                        width   mMeasuredDimension 0                                                     switch  widthMode                case View MeasureSpec EXACTLY                  width   widthSize              case View MeasureSpec AT MOST              case View MeasureSpec UNSPECIFIED                     switch  heightMode                case View MeasureSpec EXACTLY                  height   heightSize              case View MeasureSpec AT MOST              case View MeasureSpec UNSPECIFIED                     setMeasuredDimension width  height              private void measureScrapChild RecyclerView Recycler recycler  int position  int widthSpec                                     int heightSpec  int   measuredDimension            View view   recycler getViewForPosition position           if  view    null                RecyclerView LayoutParams p    RecyclerView LayoutParams  view getLayoutParams                int childWidthSpec   ViewGroup getChildMeasureSpec widthSpec                      getPaddingLeft     getPaddingRight    p width               int childHeightSpec   ViewGroup getChildMeasureSpec heightSpec                      getPaddingTop     getPaddingBottom    p height               view measure childWidthSpec  childHeightSpec               measuredDimension 0    view getMeasuredWidth     p leftMargin   p rightMargin              measuredDimension 1    view getMeasuredHeight     p bottomMargin   p topMargin              recycler recycleView view

User · Answer

UPDATE March 2016  By Android Support Library 23 2 1 of a support library version  So all WRAP CONTENT should work correctly   Please update version of a library in gradle file   compile  com android support recyclerview-v7 23 2 1    This allows a RecyclerView to size itself based on the size of its contents  This means that previously unavailable scenarios  such as using WRAP CONTENT for a dimension of the RecyclerView  are now possible   you   ll be required to call setAutoMeasureEnabled true    Fixed bugs related to various measure-spec methods in update  Check https   developer android com topic libraries support-library features html

User · Answer

I have tried all solutions  they are very useful but this only works fine for me  public class  LinearLayoutManager extends android support v7 widget LinearLayoutManager        public LinearLayoutManager Context context  int orientation  boolean reverseLayout               super context  orientation  reverseLayout              private int   mMeasuredDimension   new int 2         Override     public void onMeasure RecyclerView Recycler recycler  RecyclerView State state                            int widthSpec  int heightSpec            final int widthMode   View MeasureSpec getMode widthSpec           final int heightMode   View MeasureSpec getMode heightSpec           final int widthSize   View MeasureSpec getSize widthSpec           final int heightSize   View MeasureSpec getSize heightSpec           int width   0          int height   0          for  int i   0  i  lt  getItemCount    i                    if  getOrientation      HORIZONTAL                     measureScrapChild recycler  i                          View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                           heightSpec                          mMeasuredDimension                    width   width   mMeasuredDimension 0                   if  i    0                        height   mMeasuredDimension 1                                   else                   measureScrapChild recycler  i                          widthSpec                          View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                           mMeasuredDimension                   height   height   mMeasuredDimension 1                   if  i    0                        width   mMeasuredDimension 0                                                      if  height  lt  heightSize    width  lt  widthSize                 switch  widthMode                    case View MeasureSpec EXACTLY                      width   widthSize                  case View MeasureSpec AT MOST                  case View MeasureSpec UNSPECIFIED                             switch  heightMode                    case View MeasureSpec EXACTLY                      height   heightSize                  case View MeasureSpec AT MOST                  case View MeasureSpec UNSPECIFIED                             setMeasuredDimension width  height             else               super onMeasure recycler  state  widthSpec  heightSpec                        private void measureScrapChild RecyclerView Recycler recycler  int position  int widthSpec                                     int heightSpec  int   measuredDimension            View view   recycler getViewForPosition position           recycler bindViewToPosition view  position           if  view    null                RecyclerView LayoutParams p    RecyclerView LayoutParams  view getLayoutParams                int childWidthSpec   ViewGroup getChildMeasureSpec widthSpec                      getPaddingLeft     getPaddingRight    p width               int childHeightSpec   ViewGroup getChildMeasureSpec heightSpec                      getPaddingTop     getPaddingBottom    p height               view measure childWidthSpec  childHeightSpec               measuredDimension 0    view getMeasuredWidth     p leftMargin   p rightMargin              measuredDimension 1    view getMeasuredHeight     p bottomMargin   p topMargin              recycler recycleView view

User · Answer

Update  Many issues relating to this feature in version 23 2 0 have been fixed in 23 2 1  update to that instead   With the release of Support Library version 23 2  RecyclerView now supports that   Update build gradle to   compile  com android support recyclerview-v7 23 2 1    or any version beyond that      This release brings an exciting new feature to the LayoutManager API  auto-measurement  This allows a RecyclerView to size itself based on the size of its contents  This means that previously unavailable scenarios  such as using WRAP CONTENT for a dimension of the RecyclerView  are now possible  You   ll find all built in LayoutManagers now support auto-measurement    This can be disabled via setAutoMeasurementEnabled   if need be  Check in detail here

User · Answer

An alternative to extend LayoutManager can be just set the size of the view manually   Number of items per row height  if  all the items have the same height and the separator is included on the row   LinearLayout LayoutParams params    LinearLayout LayoutParams  mListView getLayoutParams    params height   mAdapter getItemCount     getResources   getDimensionPixelSize R dimen row height   mListView setLayoutParams params     Is still a workaround  but for basic cases it works

User · Answer

Existing layout manager do not yet support wrap content   You can create a new LayoutManager that extends the existing one and overrides onMeasure method to measure for wrap content

User · Answer

Used solution from  sinan-kozak  except fixed a few bugs  Specifically  we shouldn t use View MeasureSpec UNSPECIFIED for both the width and height when calling measureScrapChild as that won t properly account for wrapped text in the child  Instead  we will pass through the width and height modes from the parent which will allow things to work for both horizontal and vertical layouts   public class MyLinearLayoutManager extends LinearLayoutManager    public MyLinearLayoutManager Context context  int orientation  boolean reverseLayout           super context  orientation  reverseLayout      private int   mMeasuredDimension   new int 2     Override public void onMeasure RecyclerView Recycler recycler  RecyclerView State state                        int widthSpec  int heightSpec        final int widthMode   View MeasureSpec getMode widthSpec       final int heightMode   View MeasureSpec getMode heightSpec       final int widthSize   View MeasureSpec getSize widthSpec       final int heightSize   View MeasureSpec getSize heightSpec       int width   0      int height   0      for  int i   0  i  lt  getItemCount    i                  if  getOrientation      HORIZONTAL                measureScrapChild recycler  i                  View MeasureSpec makeMeasureSpec 0  View MeasureSpec UNSPECIFIED                   View MeasureSpec makeMeasureSpec heightSize  heightMode                   mMeasuredDimension                width   width   mMeasuredDimension 0               if  i    0                    height   mMeasuredDimension 1                           else               measureScrapChild recycler  i                  View MeasureSpec makeMeasureSpec widthSize  widthMode                   View MeasureSpec makeMeasureSpec 0  View MeasureSpec UNSPECIFIED                   mMeasuredDimension                height   height   mMeasuredDimension 1               if  i    0                    width   mMeasuredDimension 0                                         If child view is more than screen size  there is no need to make it wrap content  We can use original onMeasure   so we can scroll view      if  height  lt  heightSize  amp  amp  width  lt  widthSize             switch  widthMode                case View MeasureSpec EXACTLY                  width   widthSize              case View MeasureSpec AT MOST              case View MeasureSpec UNSPECIFIED                     switch  heightMode                case View MeasureSpec EXACTLY                  height   heightSize              case View MeasureSpec AT MOST              case View MeasureSpec UNSPECIFIED                     setMeasuredDimension width  height         else           super onMeasure recycler  state  widthSpec  heightSpec            private void measureScrapChild RecyclerView Recycler recycler  int position  int widthSpec                                 int heightSpec  int   measuredDimension        View view   recycler getViewForPosition position          For adding Item Decor Insets to view    super measureChildWithMargins view  0  0       if  view    null            RecyclerView LayoutParams p    RecyclerView LayoutParams  view getLayoutParams            int childWidthSpec   ViewGroup getChildMeasureSpec widthSpec                      getPaddingLeft     getPaddingRight     getDecoratedLeft view    getDecoratedRight view   p width               int childHeightSpec   ViewGroup getChildMeasureSpec heightSpec                      getPaddingTop     getPaddingBottom     getDecoratedTop view    getDecoratedBottom view    p height               view measure childWidthSpec  childHeightSpec                   Get decorated measurements             measuredDimension 0    getDecoratedMeasuredWidth view    p leftMargin   p rightMargin              measuredDimension 1    getDecoratedMeasuredHeight view    p bottomMargin   p topMargin              recycler recycleView view

User · Answer

Android Support Library now handles WRAP CONTENT property as well  Just import this in your gradle   compile  com android support recyclerview-v7 23 2 0    And done

User · Answer

This answer is based on the solution given by Denis Nek  It solves the problem of not taking decorations like dividers into account   public class WrappingRecyclerViewLayoutManager extends LinearLayoutManager    public WrappingRecyclerViewLayoutManager Context context           super context  VERTICAL  false      public WrappingRecyclerViewLayoutManager Context context  int orientation  boolean reverseLayout           super context  orientation  reverseLayout      private int   mMeasuredDimension   new int 2     Override public void onMeasure RecyclerView Recycler recycler  RecyclerView State state  int widthSpec  int heightSpec        final int widthMode   View MeasureSpec getMode widthSpec       final int heightMode   View MeasureSpec getMode heightSpec       final int widthSize   View MeasureSpec getSize widthSpec       final int heightSize   View MeasureSpec getSize heightSpec       int width   0      int height   0      for  int i   0  i  lt  getItemCount    i              measureScrapChild recycler  i                  View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                   View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                   mMeasuredDimension           if  getOrientation      HORIZONTAL                width   width   mMeasuredDimension 0               if  i    0                    height   mMeasuredDimension 1                           else               height   height   mMeasuredDimension 1               if  i    0                    width   mMeasuredDimension 0                                     switch  widthMode            case View MeasureSpec EXACTLY              width   widthSize          case View MeasureSpec AT MOST          case View MeasureSpec UNSPECIFIED             switch  heightMode            case View MeasureSpec EXACTLY              height   heightSize          case View MeasureSpec AT MOST          case View MeasureSpec UNSPECIFIED             setMeasuredDimension width  height      private void measureScrapChild RecyclerView Recycler recycler  int position  int widthSpec  int heightSpec  int   measuredDimension        View view   recycler getViewForPosition position       if  view    null            RecyclerView LayoutParams p    RecyclerView LayoutParams  view getLayoutParams            int childWidthSpec   ViewGroup getChildMeasureSpec widthSpec  getPaddingLeft     getPaddingRight    p width           int childHeightSpec   ViewGroup getChildMeasureSpec heightSpec  getPaddingTop     getPaddingBottom    p height           view measure childWidthSpec  childHeightSpec           Rect outRect   new Rect            calculateItemDecorationsForChild view  outRect           measuredDimension 0    view getMeasuredWidth     p leftMargin   p rightMargin          measuredDimension 1    view getMeasuredHeight     p bottomMargin   p topMargin   outRect bottom   outRect top          recycler recycleView view

User · Answer

Based on the work of Denis Nek  it works well if the sum  of item s widths is smaller than the size of the container  other than that  it will make the recyclerview non scrollable and only will show subset of the data   to solve this problem  i modified the solution alittle so that it choose the min of the provided size and calculated size  see below   package com linkdev gafi adapters   import android content Context  import android support v7 widget LinearLayoutManager  import android support v7 widget RecyclerView  import android view View  import android view ViewGroup   import com linkdev gafi R   public class MyLinearLayoutManager extends LinearLayoutManager        public MyLinearLayoutManager Context context  int orientation  boolean reverseLayout               super context  orientation  reverseLayout           this c   context              private Context c      private int   mMeasuredDimension   new int 2          Override     public void onMeasure RecyclerView Recycler recycler  RecyclerView State state                            int widthSpec  int heightSpec            final int widthMode   View MeasureSpec getMode widthSpec           final int heightMode   View MeasureSpec getMode heightSpec           final int widthSize   View MeasureSpec getSize widthSpec           final int heightSize   View MeasureSpec getSize heightSpec              int width   0          int height   0          for  int i   0  i  lt  getItemCount    i                  measureScrapChild recycler  i                      View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                       View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                       mMeasuredDimension                if  getOrientation      HORIZONTAL                    width   width   mMeasuredDimension 0                   if  i    0                        height   mMeasuredDimension 1                                   else                   height   height   mMeasuredDimension 1                   if  i    0                        width   mMeasuredDimension 0                                                       switch  widthMode                case View MeasureSpec EXACTLY                  width   widthSize              case View MeasureSpec AT MOST              case View MeasureSpec UNSPECIFIED                     switch  heightMode                case View MeasureSpec EXACTLY                  height   heightSize              case View MeasureSpec AT MOST              case View MeasureSpec UNSPECIFIED                     int widthDesired   Math min widthSize width           setMeasuredDimension widthDesired  height              private void measureScrapChild RecyclerView Recycler recycler  int position  int widthSpec                                     int heightSpec  int   measuredDimension            View view   recycler getViewForPosition position           if  view    null                RecyclerView LayoutParams p    RecyclerView LayoutParams  view getLayoutParams                int childWidthSpec   ViewGroup getChildMeasureSpec widthSpec                      getPaddingLeft     getPaddingRight    p width               int childHeightSpec   ViewGroup getChildMeasureSpec heightSpec                      getPaddingTop     getPaddingBottom    p height               view measure childWidthSpec  childHeightSpec               measuredDimension 0    view getMeasuredWidth     p leftMargin   p rightMargin              measuredDimension 1    view getMeasuredHeight     p bottomMargin   p topMargin              recycler recycleView view

User · Answer

Simply wrap the content using RecyclerView with the Grid Layout  Image  Recycler as GridView layout  Just use the GridLayoutManager like this   RecyclerView LayoutManager mRecyclerGrid new GridLayoutManager this 3 LinearLayoutManager VERTICAL false   mRecyclerView setLayoutManager mRecyclerGrid     You can set how many items should appear on a row  replace the 3

User · Answer

As  yigit mentioned  you need to override onMeasure    Both  user2302510 and  DenisNek have good answers but if you want to support ItemDecoration you can use this custom layout manager   And other answers cannot scroll when there are more items than can be displayed on the screen though  This one is using default implemantation of onMeasure   when there are more items than screen size   public class MyLinearLayoutManager extends LinearLayoutManager    public MyLinearLayoutManager Context context  int orientation  boolean reverseLayout           super context  orientation  reverseLayout      private int   mMeasuredDimension   new int 2     Override public void onMeasure RecyclerView Recycler recycler  RecyclerView State state                        int widthSpec  int heightSpec        final int widthMode   View MeasureSpec getMode widthSpec       final int heightMode   View MeasureSpec getMode heightSpec       final int widthSize   View MeasureSpec getSize widthSpec       final int heightSize   View MeasureSpec getSize heightSpec       int width   0      int height   0      for  int i   0  i  lt  getItemCount    i              measureScrapChild recycler  i                  View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                   View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                   mMeasuredDimension            if  getOrientation      HORIZONTAL                width   width   mMeasuredDimension 0               if  i    0                    height   mMeasuredDimension 1                           else               height   height   mMeasuredDimension 1               if  i    0                    width   mMeasuredDimension 0                                         If child view is more than screen size  there is no need to make it wrap content  We can use original onMeasure   so we can scroll view      if  height  lt  heightSize  amp  amp  width  lt  widthSize             switch  widthMode                case View MeasureSpec EXACTLY                  width   widthSize              case View MeasureSpec AT MOST              case View MeasureSpec UNSPECIFIED                     switch  heightMode                case View MeasureSpec EXACTLY                  height   heightSize              case View MeasureSpec AT MOST              case View MeasureSpec UNSPECIFIED                     setMeasuredDimension width  height         else           super onMeasure recycler  state  widthSpec  heightSpec            private void measureScrapChild RecyclerView Recycler recycler  int position  int widthSpec                                 int heightSpec  int   measuredDimension        View view   recycler getViewForPosition position          For adding Item Decor Insets to view    super measureChildWithMargins view  0  0       if  view    null            RecyclerView LayoutParams p    RecyclerView LayoutParams  view getLayoutParams            int childWidthSpec   ViewGroup getChildMeasureSpec widthSpec                      getPaddingLeft     getPaddingRight     getDecoratedLeft view    getDecoratedRight view   p width               int childHeightSpec   ViewGroup getChildMeasureSpec heightSpec                      getPaddingTop     getPaddingBottom     getPaddingBottom     getDecoratedBottom view    p height               view measure childWidthSpec  childHeightSpec                   Get decorated measurements             measuredDimension 0    getDecoratedMeasuredWidth view    p leftMargin   p rightMargin              measuredDimension 1    getDecoratedMeasuredHeight view    p bottomMargin   p topMargin              recycler recycleView view                       And if you want to use it with GridLayoutManager just extends it from GridLayoutManager and change  for  int i   0  i  lt  getItemCount    i      to   for  int i   0  i  lt  getItemCount    i   i   getSpanCount

User · Answer

The code up above doesn t work well when you need to make your items  wrap content   because it measures both items height and width with MeasureSpec UNSPECIFIED  After some troubles I ve modified that solution so now items can expand  The only difference is that it provides parents height or width MeasureSpec depends on layout orientation   public class MyLinearLayoutManager extends LinearLayoutManager    public MyLinearLayoutManager Context context  int orientation  boolean reverseLayout           super context  orientation  reverseLayout      private int   mMeasuredDimension   new int 2     Override public void onMeasure RecyclerView Recycler recycler  RecyclerView State state                        int widthSpec  int heightSpec        final int widthMode   View MeasureSpec getMode widthSpec       final int heightMode   View MeasureSpec getMode heightSpec       final int widthSize   View MeasureSpec getSize widthSpec       final int heightSize   View MeasureSpec getSize heightSpec       int width   0      int height   0      for  int i   0  i  lt  getItemCount    i                if  getOrientation      HORIZONTAL                 measureScrapChild recycler  i                      View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                       heightSpec                      mMeasuredDimension                width   width   mMeasuredDimension 0               if  i    0                    height   mMeasuredDimension 1                           else               measureScrapChild recycler  i                      widthSpec                      View MeasureSpec makeMeasureSpec i  View MeasureSpec UNSPECIFIED                       mMeasuredDimension               height   height   mMeasuredDimension 1               if  i    0                    width   mMeasuredDimension 0                                     switch  widthMode            case View MeasureSpec EXACTLY              width   widthSize          case View MeasureSpec AT MOST          case View MeasureSpec UNSPECIFIED             switch  heightMode            case View MeasureSpec EXACTLY              height   heightSize          case View MeasureSpec AT MOST          case View MeasureSpec UNSPECIFIED             setMeasuredDimension width  height      private void measureScrapChild RecyclerView Recycler recycler  int position  int widthSpec                                 int heightSpec  int   measuredDimension        View view   recycler getViewForPosition position       recycler bindViewToPosition view  position       if  view    null            RecyclerView LayoutParams p    RecyclerView LayoutParams  view getLayoutParams            int childWidthSpec   ViewGroup getChildMeasureSpec widthSpec                  getPaddingLeft     getPaddingRight    p width           int childHeightSpec   ViewGroup getChildMeasureSpec heightSpec                  getPaddingTop     getPaddingBottom    p height           view measure childWidthSpec  childHeightSpec           measuredDimension 0    view getMeasuredWidth     p leftMargin   p rightMargin          measuredDimension 1    view getMeasuredHeight     p bottomMargin   p topMargin          recycler recycleView view

User · Answer

Yes the workaround shown in all answer is correct   that is we need to customize the linear layout manager to calculate the height of its child items dynamically at run time  But all answers not working as expected  Please the below answer for custom layout manger with all orientation support   public class MyLinearLayoutManager extends android support v7 widget LinearLayoutManager    private static boolean canMakeInsetsDirty   true  private static Field insetsDirtyField   null   private static final int CHILD WIDTH   0  private static final int CHILD HEIGHT   1  private static final int DEFAULT CHILD SIZE   100   private final int   childDimensions   new int 2   private final RecyclerView view   private int childSize   DEFAULT CHILD SIZE  private boolean hasChildSize  private int overScrollMode   ViewCompat OVER SCROLL ALWAYS  private final Rect tmpRect   new Rect      SuppressWarnings  UnusedDeclaration   public MyLinearLayoutManager Context context        super context       this view   null      SuppressWarnings  UnusedDeclaration   public MyLinearLayoutManager Context context  int orientation  boolean reverseLayout        super context  orientation  reverseLayout       this view   null      SuppressWarnings  UnusedDeclaration   public MyLinearLayoutManager RecyclerView view        super view getContext         this view   view      this overScrollMode   ViewCompat getOverScrollMode view       SuppressWarnings  UnusedDeclaration   public MyLinearLayoutManager RecyclerView view  int orientation  boolean reverseLayout        super view getContext    orientation  reverseLayout       this view   view      this overScrollMode   ViewCompat getOverScrollMode view      public void setOverScrollMode int overScrollMode        if  overScrollMode  lt  ViewCompat OVER SCROLL ALWAYS    overScrollMode  gt  ViewCompat OVER SCROLL NEVER          throw new IllegalArgumentException  Unknown overscroll mode      overScrollMode       if  this view    null  throw new IllegalStateException  view    null        this overScrollMode   overScrollMode      ViewCompat setOverScrollMode view  overScrollMode      public static int makeUnspecifiedSpec         return View MeasureSpec makeMeasureSpec 0  View MeasureSpec UNSPECIFIED       Override public void onMeasure RecyclerView Recycler recycler  RecyclerView State state  int widthSpec  int heightSpec        final int widthMode   View MeasureSpec getMode widthSpec       final int heightMode   View MeasureSpec getMode heightSpec        final int widthSize   View MeasureSpec getSize widthSpec       final int heightSize   View MeasureSpec getSize heightSpec        final boolean hasWidthSize   widthMode    View MeasureSpec UNSPECIFIED      final boolean hasHeightSize   heightMode    View MeasureSpec UNSPECIFIED       final boolean exactWidth   widthMode    View MeasureSpec EXACTLY      final boolean exactHeight   heightMode    View MeasureSpec EXACTLY       final int unspecified   makeUnspecifiedSpec         if  exactWidth  amp  amp  exactHeight               in case of exact calculations for both dimensions let s use default  onMeasure  implementation         super onMeasure recycler  state  widthSpec  heightSpec           return             final boolean vertical   getOrientation      VERTICAL       initChildDimensions widthSize  heightSize  vertical        int width   0      int height   0          it s possible to get scrap views in recycler which are bound to old  invalid  adapter entities  This        happens because their invalidation happens after  onMeasure  method  As a workaround let s clear the        recycler now  it should not cause any performance issues while scrolling as  onMeasure  is never        called whiles scrolling      recycler clear         final int stateItemCount   state getItemCount        final int adapterItemCount   getItemCount           adapter always contains actual data while state might contain old data  f e  data before the animation is        done   As we want to measure the view with actual data we must use data from the adapter and not from  the        state     for  int i   0  i  lt  adapterItemCount  i              if  vertical                if   hasChildSize                    if  i  lt  stateItemCount                           we should not exceed state count  otherwise we ll get IndexOutOfBoundsException  For such items                        we will use previously calculated dimensions                     measureChild recycler  i  widthSize  unspecified  childDimensions                     else                       logMeasureWarning i                                               height    childDimensions CHILD HEIGHT               if  i    0                    width   childDimensions CHILD WIDTH                             if  hasHeightSize  amp  amp  height  gt   heightSize                    break                          else               if   hasChildSize                    if  i  lt  stateItemCount                           we should not exceed state count  otherwise we ll get IndexOutOfBoundsException  For such items                        we will use previously calculated dimensions                     measureChild recycler  i  unspecified  heightSize  childDimensions                     else                       logMeasureWarning i                                               width    childDimensions CHILD WIDTH               if  i    0                    height   childDimensions CHILD HEIGHT                             if  hasWidthSize  amp  amp  width  gt   widthSize                    break                                     if  exactWidth            width   widthSize        else           width    getPaddingLeft     getPaddingRight            if  hasWidthSize                width   Math min width  widthSize                        if  exactHeight            height   heightSize        else           height    getPaddingTop     getPaddingBottom            if  hasHeightSize                height   Math min height  heightSize                        setMeasuredDimension width  height        if  view    null  amp  amp  overScrollMode    ViewCompat OVER SCROLL IF CONTENT SCROLLS            final boolean fit    vertical  amp  amp    hasHeightSize    height  lt  heightSize                        vertical  amp  amp    hasWidthSize    width  lt  widthSize             ViewCompat setOverScrollMode view  fit   ViewCompat OVER SCROLL NEVER   ViewCompat OVER SCROLL ALWAYS            private void logMeasureWarning int child        if  BuildConfig DEBUG            Log w  MyLinearLayoutManager    Can t measure child      child      previously used dimensions will be reused                      To remove this message either use  setChildSize   method or don t run RecyclerView animations             private void initChildDimensions int width  int height  boolean vertical        if  childDimensions CHILD WIDTH     0    childDimensions CHILD HEIGHT     0               already initialized  skipping         return            if  vertical            childDimensions CHILD WIDTH    width          childDimensions CHILD HEIGHT    childSize        else           childDimensions CHILD WIDTH    childSize          childDimensions CHILD HEIGHT    height            Override public void setOrientation int orientation           might be called before the constructor of this class is called       noinspection ConstantConditions     if  childDimensions    null            if  getOrientation      orientation                childDimensions CHILD WIDTH    0              childDimensions CHILD HEIGHT    0                      super setOrientation orientation      public void clearChildSize         hasChildSize   false      setChildSize DEFAULT CHILD SIZE      public void setChildSize int childSize        hasChildSize   true      if  this childSize    childSize            this childSize   childSize          requestLayout             private void measureChild RecyclerView Recycler recycler  int position  int widthSize  int heightSize  int   dimensions        final View child      try           child   recycler getViewForPosition position         catch  IndexOutOfBoundsException e            if  BuildConfig DEBUG                Log w  MyLinearLayoutManager    MyLinearLayoutManager doesn t work well with animations  Consider switching them off   e                     return             final RecyclerView LayoutParams p    RecyclerView LayoutParams  child getLayoutParams         final int hPadding   getPaddingLeft     getPaddingRight        final int vPadding   getPaddingTop     getPaddingBottom         final int hMargin   p leftMargin   p rightMargin      final int vMargin   p topMargin   p bottomMargin          we must make insets dirty in order calculateItemDecorationsForChild to work     makeInsetsDirty p          this method should be called before any getXxxDecorationXxx   methods     calculateItemDecorationsForChild child  tmpRect        final int hDecoration   getRightDecorationWidth child    getLeftDecorationWidth child       final int vDecoration   getTopDecorationHeight child    getBottomDecorationHeight child        final int childWidthSpec   getChildMeasureSpec widthSize  hPadding   hMargin   hDecoration  p width  canScrollHorizontally         final int childHeightSpec   getChildMeasureSpec heightSize  vPadding   vMargin   vDecoration  p height  canScrollVertically          child measure childWidthSpec  childHeightSpec        dimensions CHILD WIDTH    getDecoratedMeasuredWidth child    p leftMargin   p rightMargin      dimensions CHILD HEIGHT    getDecoratedMeasuredHeight child    p bottomMargin   p topMargin          as view is recycled let s not keep old measured values     makeInsetsDirty p       recycler recycleView child      private static void makeInsetsDirty RecyclerView LayoutParams p        if   canMakeInsetsDirty            return            try           if  insetsDirtyField    null                insetsDirtyField   RecyclerView LayoutParams class getDeclaredField  mInsetsDirty                insetsDirtyField setAccessible true                     insetsDirtyField set p  true         catch  NoSuchFieldException e            onMakeInsertDirtyFailed          catch  IllegalAccessException e            onMakeInsertDirtyFailed             private static void onMakeInsertDirtyFailed         canMakeInsetsDirty   false      if  BuildConfig DEBUG            Log w  MyLinearLayoutManager    Can t make LayoutParams insets dirty  decorations measurements might be incorrect

[android] Nested Recycler view height doesn't wrap its content

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