How to set border for android recyclerview grid layout.

HomepageActivity.java

recyclerView = findViewById(R.id.recyclerView);
imageAdapter = new ImageAdapter(this);

recyclerView.setHasFixedSize(true);
recyclerView.addItemDecoration(new DividerItemDecoration(this,
                DividerItemDecoration.HORIZONTAL))
recyclerView.addItemDecoration(new DividerItemDecoration(this,
                DividerItemDecoration.VERTICAL))
recyclerView.setLayoutManager(new GridLayoutManager(HomepageActivity.this,2));
recyclerView.setAdapter(imageAdapter);

single_item_homepage.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:foreground="?android:selectableItemBackground"
    android:orientation="vertical"
    android:padding="@dimen/fifteen_dp">

    <ImageView
        android:id="@+id/ivGraphItemThumb"
        android:layout_width="match_parent"
        android:layout_height="125dp"
        tools:src="@drawable/ic_recent_exce" />

    <TextView
        android:id="@+id/tvMenu"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:textColor="@color/black"
        android:textSize="@dimen/fifteen_sp"
        tools:text="Item 1" />
</LinearLayout>