title: Button not display below RecycleView in Android Studio
body: <p>A layout is designed using <code>RecycleView</code> to display images. A button is added below <code>RecycleView</code> to save the selected items from the list.button is not visible not in Design View nor when I run the app . Couldn't trace where the problem is. The code is:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  android:fitsSystemWindows="true"
  tools:context="com.example.user.recycleview.imagesview"&gt;
  
  &lt;android.support.design.widget.AppBarLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginBottom="4dp"
      android:theme="@style/AppTheme.AppBarLayout"&gt;
  
      &lt;android.support.v7.widget.Toolbar
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="?attr/actionBarSize"
          android:background="@color/titlebar"
          app:popupTheme="@style/AppTheme.PopupOverlay" /&gt;
  
  &lt;/android.support.design.widget.AppBarLayout&gt;
  
  &lt;view
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      class="android.support.v7.widget.RecyclerView"
      android:id="@+id/recycler_view" /&gt;
  
  &lt;Button
      android:id="@+id/button7"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="center_horizontal"
      android:background="@drawable/savebutton"
      android:text="@string/save"
      android:textColor="@color/white"
      android:textSize="12pt" /&gt;
  
  
  &lt;!--
  Deleted fab element
  --&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>