Fragments on top of each other

gistfile1.txt

	<android.support.design.widget.CoordinatorLayout
			android:id="@+id/activity_container"
			android:layout_width="match_parent"
			android:layout_height="match_parent">
      
      <!--This will be the one we'll cover-->
		<FrameLayout
				android:id="@+id/list_fragment_container"
				android:layout_width="match_parent"
				android:layout_height="match_parent"/>

      <!--This is the top one. If it's there we don't see the list_container-->
		<FrameLayout
				android:id="@+id/detail_fragment_container"
				android:layout_width="match_parent"
				android:layout_height="match_parent"/>

	</android.support.design.widget.CoordinatorLayout>
  
  //...
  //In the Activity, you just add the bott
  private void addListFragment() {
    getSupportFragmentManager().beginTransaction()
      .replace(R.id.list_fragment_container, ShareLinkListFragment.newInstance(preziOid, preziTitle), ShareLinkListFragment.TAG)
      .commit();
    showList();
  }
  
  public void showDetailFragment() {
    //A bit simplified code...
    Fragment detailFragment = DetailFragment.newInstance(preziOid, preziTitle, constructRevealSettings());
    getActivity().getSupportFragmentManager().beginTransaction()
      .replace(R.id.detail_fragment_container, fragment, DetailFragment.TAG)
      .commit();
  }