title: How to set RecyclerView app:layoutManager="" from XML?
body: <p>How to set <a href="http://developer.android.com/intl/zh-tw/reference/android/support/v7/widget/RecyclerView.html">RecyclerView</a> layoutManager from XML? </p>
  
  <pre><code>    &lt;android.support.v7.widget.RecyclerView
          app:layoutManager="???"
          android:layout_width="match_parent"
          android:layout_height="match_parent"/&gt;
  </code></pre>