Main Activity

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.baculsoft.belajarandroid.views.activities.MainActivity"
    tools:targetApi="LOLLIPOP">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorAccent"
            android:elevation="4dp"
            android:minHeight="?attr/actionBarSize">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar_main"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </android.support.design.widget.AppBarLayout>
    </RelativeLayout>
</android.support.design.widget.CoordinatorLayout>