Divideritemdecoration does not display Android

I have a simple layout for recycler view items

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/details"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:background="?android:attr/selectableItemBackground"
android:paddingEnd="15dp"
android:paddingStart="15dp"
>

<org.tchouaffe.ftinfosystem.utils.CustomTextView
    android:id="@+id/name"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:textColor="@color/primaryTextColor"
    android:textSize="15sp"/>


<org.tchouaffe.ftinfosystem.utils.CustomTextView
    android:id="@+id/level"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_alignParentRight="true"
    android:layout_toRightOf="@id/name"
    android:gravity="center_vertical|right"
    android:textColor="@color/primaryTextColor"
    android:textSize="15sp"/>
</RelativeLayout>

The following code does set the recycle bin view:

 RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerview);
    linearlayoutmanager layoutManager = new linearlayoutmanager(getActivity());
    MyAdapter adapter = new MyAdapter(activity, elementList);
    adapter.setHasStableIds(true);
    DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView
            .getContext(), DividerItemDecoration.VERTICAL);
    recyclerView.addItemDecoration(dividerItemDecoration);
    recyclerView.setHasFixedSize(false);
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setAdapter(adapter);

For unknown reasons, the separator line is not displayed. Do you have any ideas?

I'm using Android. Support. V7. Widget. Divideritemdecoration

thank you

resolvent:

You also need to call setdrawable() on dividerdecoration

Provide resources that can be drawn. XML shape drawable may be a good start. Shapes will be rendered as separators between recycler project views

Alternatively, when declaring the application topic, you can set the Android: listdivider project to the desired drawable