title: Fragment Content Overlaps Toolbar and Bottom Navigation View
body: <p>I have implemented a bottom navigation view in  my android application. With five fragments. However, I have a problem that each time I change the fragment the content of the fragment overlaps the toolbar.</p>
  
  <p>layout for the bottom navigation view </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.constraint.ConstraintLayout
      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"
      tools:context=".DashboardActivity"&gt;
  
      &lt;include layout="@layout/toolbar"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"&gt;
      &lt;/include&gt;
  
      &lt;FrameLayout
          android:id="@+id/container"
          android:layout_width="match_parent"
          android:layout_above="@+id/navigationView"
          android:layout_height="match_parent"
  
  
         /&gt;
  
      &lt;android.support.design.widget.BottomNavigationView
          android:id="@+id/navigationView"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          android:layout_marginEnd="0dp"
          android:layout_marginStart="0dp"
          android:background="?android:attr/windowBackground"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintLeft_toLeftOf="parent"
          app:layout_constraintRight_toRightOf="parent"
          app:itemBackground="@android:color/white"
          app:itemIconTint="@color/cardview_dark_background"
          app:itemTextColor="@android:color/black"
          app:menu="@menu/navigation_menu"
          /&gt;
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p>an example of one of the fragments layout </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;android.support.constraint.ConstraintLayout 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:id="@+id/frameLayout"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      tools:context=".AttendanceFragment"&gt;
  
      &lt;android.support.constraint.Guideline
          android:id="@+id/guideline"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:orientation="vertical"
          app:layout_constraintGuide_percent="0.7" /&gt;
  
      &lt;android.support.v7.widget.CardView
          android:id="@+id/cardView2"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          app:layout_constraintBottom_toTopOf="@+id/barrier3"
          app:layout_constraintEnd_toStartOf="@+id/guideline"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toTopOf="parent"&gt;
  
          &lt;Spinner
              android:id="@+id/spinner_courses"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_marginStart="8dp"
              android:paddingBottom="4dp"
              android:paddingTop="4dp"
              app:layout_constraintEnd_toStartOf="@+id/guideline"
              app:layout_constraintStart_toStartOf="parent"
              app:layout_constraintTop_toTopOf="parent" /&gt;
      &lt;/android.support.v7.widget.CardView&gt;
  
      &lt;TextView
          android:id="@+id/tv_time"
          android:layout_width="0dp"
          android:layout_height="wrap_content"
          android:gravity="center"
          android:textColor="@color/colorPrimaryDark"
          android:textSize="12sp"
          app:layout_constraintBottom_toTopOf="@+id/barrier3"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toStartOf="@+id/guideline"
          app:layout_constraintTop_toTopOf="parent"
          tools:text="Date" /&gt;
  
  
      &lt;android.support.design.widget.FloatingActionButton
          android:id="@+id/add_fab"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="bottom|right"
  
          android:layout_margin="16dp"
  
          android:src="@drawable/ic_add_icon"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintRight_toRightOf="parent"/&gt;
  
      &lt;!--&lt;android.support.design.widget.FloatingActionButton
          android:id="@+id/floatingActionButton"
          android:layout_width="30dp"
          android:layout_height="30dp"
          android:layout_marginBottom="4dp"
          android:layout_marginEnd="8dp"
          android:layout_marginLeft="8dp"
          android:layout_marginRight="8dp"
          android:layout_marginStart="8dp"
          android:layout_marginTop="4dp"
          android:clickable="true"
          app:srcCompat="@drawable/ic_more_vert_black_24dp"
          app:fabSize="mini"
          app:layout_constraintBottom_toBottomOf="@+id/textView3"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toEndOf="@+id/spinner"
          app:layout_constraintTop_toTopOf="parent"
          android:focusable="true" /&gt;--&gt;
  
      &lt;android.support.constraint.Barrier
          android:id="@+id/barrier3"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          app:barrierDirection="bottom"
          app:constraint_referenced_ids="cardView2,tv_time"
          tools:layout_editor_absoluteY="511dp" /&gt;
  
      &lt;android.support.v7.widget.CardView
          android:layout_width="match_parent"
          android:layout_height="0dp"
          android:layout_marginTop="4dp"
          app:cardBackgroundColor="@color/colorMainBackground"
          app:layout_constraintBottom_toBottomOf="parent"
          app:layout_constraintEnd_toEndOf="parent"
          app:layout_constraintStart_toStartOf="parent"
          app:layout_constraintTop_toTopOf="@+id/barrier3"&gt;
  
          &lt;android.support.v7.widget.RecyclerView
              android:id="@+id/rv_register"
              android:layout_width="match_parent"
              android:layout_height="match_parent"&gt;
  
          &lt;/android.support.v7.widget.RecyclerView&gt;
      &lt;/android.support.v7.widget.CardView&gt;
  
  &lt;/android.support.constraint.ConstraintLayout&gt;
  </code></pre>
  
  <p>This is what the screen look like with overlapping content</p>
  
  <p><a href="https://i.stack.imgur.com/xvQBv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/xvQBv.png" alt="enter image description here"></a></p>