android - center items horizontally in RecyclerView(using GridLayoutManager) -

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i'm trying center items horizontally each row in recyclerview

i tried many things: relativelayout parent, use layout_centerinparent, use basic android:layout_gravity="center", try add space element,using weights , .... in item_row.xml
didn't succeed :(

what have

a busy cat

what want

a busy cat

in activity

recyclerview.setlayoutmanager(new gridlayoutmanager(this, 3));

item_row.xml

<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="wrap_content" android:layout_height="wrap_content" card_view:cardcornerradius="2dp" card_view:cardelevation="4dp" card_view:cardusecompatpadding="true">  <!--   recycler view item row   --> <linearlayout     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:orientation="vertical">       <imageview         android:id="@+id/imgthumbnail"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:adjustviewbounds="true"         android:background="@android:color/black" />      <linearlayout         android:orientation="vertical"         android:layout_width="match_parent"         android:layout_height="wrap_content">           <textview             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:textappearance="?android:attr/textappearancemedium"             android:text="item name"             android:id="@+id/txtname"             android:layout_margin="5dp"             android:singleline="false"             android:lines="2"             android:gravity="center" />          <linearlayout             android:orientation="horizontal"             android:layout_width="match_parent"             android:layout_height="match_parent">              <textview                 android:layout_width="0dp"                 android:layout_height="match_parent"                 android:textappearance="?android:attr/textappearancesmall"                 android:id="@+id/txtcategory"                 android:textstyle="italic"                 android:textcolor="#496fa9"                 android:text="subtitle"                 android:layout_weight="1"                 android:gravity="center_vertical"                 android:paddingleft="10dp"                 android:layout_gravity="center" />              <imagebutton                 android:id="@+id/imagebutton"                 android:layout_width="48dp"                 android:layout_height="wrap_content"                 android:background="@android:color/black"                 android:adjustviewbounds="true"                 android:scaletype="fitcenter"                 android:padding="8dp"/>          </linearlayout>      </linearlayout>  </linearlayout>  </android.support.v7.widget.cardview>

i googled lot , found answer don't know how create linearlayout each row of items!

  • is best solution?

  • any other idea?

you can use spansizelookup make views/items different widths grid view. can cleverness empty views adjust accordingly. might more complicate or simpler depending on how variable layout is.

reference: https://developer.android.com/reference/android/support/v7/widget/gridlayoutmanager.spansizelookup.html

for specific case show on drawing like:

gridlayoutmanager lm = new gridlayoutmanager(context, 6); lm.setspansizelookup(new mysizelookup());  public static class mysizelookup extends spansizelookup {     public int getspansize(int position) {       if(position >= 0 && position <= 2) {           return 2;       } else if (position == 3 || position == 6) {           return 1;       } else {           return 2;       }    } }

and you'll have make on adapter, position 3 , 6 empty/invisible element. new view(context); occupy space


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