java - RecyclerView space between items expanding when scrolling -

i finished recyclerview android application, when testing out, found strange bug don't understand. when activity launches, items in recycler view positioned in recyclerview @ correct distances. however, once start scrolling move apart each other until 1 item visible @ once, , have scroll distance equivalent of screen before seeing next item.

here bug looks like:

before scrolling on activity lunch

after scrolling recycleview

if have idea might causing this, appreciated.

here recyclerview code activity:

private arraylist<string> imagesurllistthumb, imagesurllistfull = new arraylist<string>(); private recycleradapter recycleradapter; private string urlrecyclerthumb = ""; private recyclerview recyclerview; private imageview imgcurrecyclerview;      imagesurllistthumb = produit.getimgurlthumbmul();     recycleradapter = new recycleradapter(getapplicationcontext(), imagesurllistthumb);     recyclerview = (recyclerview) findviewbyid(r.id.content_product_detail_recycer_view);     recyclerview.layoutmanager recyclerlayoutmanager = new linearlayoutmanager(getapplicationcontext(), linearlayoutmanager.horizontal, false);     recyclerview.setlayoutmanager(recyclerlayoutmanager);     recyclerview.setadapter(recycleradapter);     urlrecyclerthumb = imagesurllistthumb.get(0);     recycleritemclicksupport.addto(recyclerview).setonitemclicklistener(new recycleritemclicksupport.onitemclicklistener() {         @override         public void onitemclicked(recyclerview rv, int pos, view view) {             urlrecyclerthumb = imagesurllistthumb.get(pos);             picasso.with(getapplicationcontext()).load(urlrecyclerthumb).fit().into(imgcurrecyclerview);         }     }); 

recycler adapter:

public class recycleradapter extends recyclerview.adapter<recycleradapter.myviewholder>{  private list<string> urlthumbimg; private context context;  public recycleradapter(context ctx, list<string> urls){     this.urlthumbimg = urls;     this.context = ctx; }  @override public recycleradapter.myviewholder oncreateviewholder(viewgroup parent, int viewtype){     view itemview = layoutinflater.from(parent.getcontext()).inflate(r.layout.item_list_slideshow, parent, false);     return new myviewholder(itemview); }  @override public void onbindviewholder(recycleradapter.myviewholder holder, int position){     string current = urlthumbimg.get(position);     picasso.with(context).load(current).fit().into(holder.myimgview); }  @override public int getitemcount(){     return urlthumbimg.size(); }  public class myviewholder extends recyclerview.viewholder {     public imageview myimgview;      public myviewholder(view view){         super(view);         myimgview = (imageview) view.findviewbyid(r.id.imageview_slide);     } } } 

here xml layout concerning recycler view:

<!-- recycler view -->     <linearlayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_margintop="15dp"         android:orientation="vertical">          <imageview             android:id="@+id/content_product_detail_recycer_view_cur_image"             android:layout_width="150dp"             android:layout_height="130dp"             android:layout_gravity="center"             android:background="@android:color/black" />          <android.support.v7.widget.recyclerview             android:id="@+id/content_product_detail_recycer_view"             android:layout_width="wrap_content"             android:layout_height="60dp"             android:layout_gravity="center"             android:layout_margin="5dp"             android:background="@android:color/darker_gray">          </android.support.v7.widget.recyclerview>      </linearlayout> 

layout item inside recyclerview:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent">  <imageview     android:id="@+id/imageview_slide"     android:layout_width="60dp"     android:layout_height="60dp"     android:layout_margin="5dp"     android:background="@android:color/darker_gray" /> 

provide layout , recyclerview code debug , not make guess.

ok here issue:

with release 2.3.0 there exciting new feature layoutmanager api: auto-measurement! allows recyclerview size based on size of contents. means unavailable scenarios, such using wrap_content dimension of recyclerview, possible. you’ll find built in layoutmanagers support auto-measurement.

due change, make sure double check layout parameters of item views: previously ignored layout parameters (such match_parent in scroll direction) respected.

basically need remove linearlayout

<imageview android:id="@+id/imageview_slide" android:layout_width="60dp" android:layout_height="60dp" android:layout_margin="5dp" android:background="@android:color/darker_gray" /> 

the match_parent in linearlayout width causing each item fit entire screen 1 image , remaining space.

if insist on using linearlayout, set both width , height wrap_content