how to add basic toolbar in android code example

Example: android toolbar example

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="58dp"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:titleTextColor="#ffffff">

</android.support.v7.widget.Toolbar>
</LinearLayout>