title: center items horizontally in RecyclerView(using GridLayoutManager)
body: <p>I'm trying to center all my items horizontally for each row in <code>RecyclerView</code></p>
  
  <p>I tried many things: RelativeLayout as a parent, then use layout_centerInParent, use the basic android:layout_gravity="center", try to add some space element,using weights and .... in <code>
  item_row.xml</code><br>
  but I didn't succeed :(</p>
  
  <p><strong>What i have</strong></p>
  
  <p><img src="https://i.stack.imgur.com/NXQI0.png" alt="a busy cat"></p>
  
  <p><strong>What i want</strong></p>
  
  <p><img src="https://i.stack.imgur.com/nqWUd.png" alt="a busy cat"></p>
  
  <p><strong>In activity</strong></p>
  
  <pre><code>recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
  </code></pre>
  
  <p><strong>item_row.xml</strong></p>
  
  <pre><code>&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="wrap_content"
  android:layout_height="wrap_content"
  card_view:cardCornerRadius="2dp"
  card_view:cardElevation="4dp"
  card_view:cardUseCompatPadding="true"&gt;
  
  &lt;!--   Recycler View Item Row   --&gt;
  &lt;LinearLayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:orientation="vertical"&gt;
  
  
      &lt;ImageView
          android:id="@+id/imgThumbnail"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:adjustViewBounds="true"
          android:background="@android:color/black" /&gt;
  
      &lt;LinearLayout
          android:orientation="vertical"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"&gt;
  
  
          &lt;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" /&gt;
  
          &lt;LinearLayout
              android:orientation="horizontal"
              android:layout_width="match_parent"
              android:layout_height="match_parent"&gt;
  
              &lt;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" /&gt;
  
              &lt;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"/&gt;
  
          &lt;/LinearLayout&gt;
  
      &lt;/LinearLayout&gt;
  
  &lt;/LinearLayout&gt;
  
  &lt;/android.support.v7.widget.CardView&gt;
  </code></pre>
  
  <p>i googled a lot and found this <a href="https://stackoverflow.com/questions/30007956/how-to-center-items-of-a-recyclerview">answer</a> but actually i don't know how to create a <code>LinearLayout</code> for each row of items!</p>
  
  <ul>
  <li><p>is that the best solution?</p></li>
  <li><p>any other idea?</p></li>
  </ul>