<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/coordinatorLayout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <com.google.android.material.appbar.AppBarLayout android:id="@+id/appBarLayout" android:layout_width="0dp" android:layout_height="wrap_content" android:theme="@style/Theme.FlickrBrowser2.AppBarOverlay" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent"> <androidx.appcompat.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="?attr/colorPrimary" app:popupTheme="@style/Theme.FlickrBrowser2.PopupOverlay" /> </com.google.android.material.appbar.AppBarLayout> <include layout="@layout/content_main" android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/appBarLayout" /> </androidx.constraintlayout.widget.ConstraintLayout>