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activity_detail.xml

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             android:layout_width="match_parent"
             android:layout_height="match_parent">
    <android.support.v4.view.ViewPager android:id="@+id/pager"
                                       android:layout_width="match_parent"
                                       android:layout_height="match_parent" />
    <Toolbar android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?android:actionBarSize"
             android:navigationIcon="@drawable/ic_arrow_back" />