title: Button under recyclerview is not visible
body: <p>I'm progrmming app with <code>RecyclerView</code> and bottom buttons. <code>RecyclerView</code> is filling by images, that I got from the server. Top  bar is fixed</p>
  
  <p><a href="http://joxi.ru/KAxee4XTEMpPr8" rel="nofollow">http://joxi.ru/KAxee4XTEMpPr8</a></p>
  
  <p><strong>RecyclerView code</strong></p>
  
  <pre><code>&lt;android.support.v7.widget.RecyclerView
      android:id="@+id/recyclerView"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      /&gt;
  </code></pre>
  
  <p><strong>RecyclerView is filling by ImageViews</strong></p>
  
  <pre><code> &lt;ImageView xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="100dp"
  android:scaleType="centerCrop"
  android:layout_marginBottom="1dp"
  android:layout_marginEnd="1dp"
  android:layout_marginStart="1dp"
  android:layout_marginTop="1dp" /&gt;
  </code></pre>
  
  <p><strong>Buttons code that invisible</strong></p>
  
  <pre><code> &lt;LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="horizontal"
      android:weightSum="3"&gt;
  
      &lt;ru.noorsoft.rubkoff.HeButton
          android:id="@+id/button1"
          style="@style/leftButStyle"
          android:layout_width="wrap_content"
          android:layout_height="55dp"
          android:layout_weight="1"
          android:gravity="center"
          android:textAllCaps="false"
          android:textColor="@color/colorBlue"
          android:textSize="20sp" /&gt;
  
      &lt;ru.noorsoft.rubkoff.HeButton
          android:id="@+id/button2"
          android:background="@android:color/transparent"
          android:layout_width="wrap_content"
          android:layout_height="55dp"
          android:layout_weight="1"
          android:textColor="@color/colorBlue"
          android:textAllCaps="false"
          android:textSize="20sp" /&gt;
  
      &lt;ru.noorsoft.rubkoff.HeButton
          android:id="@+id/button3"
          style="@style/rightButStyle"
          android:layout_width="wrap_content"
          android:layout_height="55dp"
          android:layout_weight="1"
          android:textColor="@color/colorBlue"
          android:textAllCaps="false"
          android:textSize="20sp" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>