Buttons on the toolbar are not installed? What could be the reason?

Question

Java

There is no activity name in tollbare and no menu button, just "naked"

Answer 1

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   android:background="@color/colorAccent">
    <include android:id= "@+id/toolbar"
        layout="@layout/toolbar" />
</LinearLayout>

and here is the tulba

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorPrimary"
     />

Answer 2

xml-activities in the studio.