title: how to set bottom navigation bar position fixed in android
body: <p>please help me to set bottom navigation bar position to fixed at bottom,
  because I'm facing problem while entering inputs in editText fields,bottom navigation bar is moving up and overlaying on other fields</p>
  
  <p>code: </p>
  
  <pre><code>&lt;RelativeLayout 
   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"&gt;
  
  &lt;!---     --&gt;
   &lt;android.support.design.widget.BottomNavigationView
          android:id="@+id/bottom_navigation"
          android:background="#FF6936C3"
          android:layout_alignParentBottom="true"
          android:layout_width="match_parent"
          android:layout_height="48dp"
          android:layout_gravity="start"
          app:itemIconTint="@android:color/white"
          app:itemTextColor="@android:color/white"
          app:menu="@menu/bottom_nav_items" /&gt; 
  &lt;/RelativeLayout&gt;
  </code></pre>