BarInsta/app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".activities.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <include
            android:id="@+id/toolbar"
            layout="@layout/layout_include_toolbar" />

        <awais.instagrabber.customviews.RemixDrawerLayout
            android:id="@+id/drawerLayout"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <!-- Profile View -->
            <include
                android:id="@+id/profile_view"
                layout="@layout/layout_profile_view" />

            <!-- Feed View -->
            <include
                android:id="@+id/feed_view"
                layout="@layout/layout_feed_view" />

            <!-- Discover View -->
            <androidx.coordinatorlayout.widget.CoordinatorLayout
                android:id="@+id/discoverLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="end"
                android:animateLayoutChanges="true"
                android:tag="@android:string/yes">

                <com.google.android.material.appbar.AppBarLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@null"
                    app:elevation="0dp">
                    <com.google.android.material.appbar.CollapsingToolbarLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        app:layout_scrollFlags="scroll|snap|enterAlways">

                        <androidx.appcompat.widget.AppCompatSpinner
                            android:id="@+id/discoverType"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:entries="@array/discover_placeholder"/>
                    </com.google.android.material.appbar.CollapsingToolbarLayout>
                </com.google.android.material.appbar.AppBarLayout>

                <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
                    android:id="@+id/discoverSwipeRefreshLayout"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="end"
                    android:tag="@android:string/yes"
                    app:layout_behavior="@string/appbar_scrolling_view_behavior">

                    <androidx.recyclerview.widget.RecyclerView
                        android:id="@+id/discoverPosts"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:clipToPadding="false"
                        tools:listitem="@layout/item_feed_photo" />
                </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
            </androidx.coordinatorlayout.widget.CoordinatorLayout>
        </awais.instagrabber.customviews.RemixDrawerLayout>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/iconSlider"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal">

        <androidx.appcompat.widget.AppCompatImageView
            android:layout_width="20dp"
            android:layout_height="20dp"
            app:srcCompat="@drawable/ic_feed"
            app:tint="?android:textColorSecondary" />

        <androidx.appcompat.widget.AppCompatImageView
            android:layout_width="20dp"
            android:layout_height="20dp"
            app:srcCompat="@drawable/ic_profile"
            app:tint="?android:textColorPrimary" />

        <androidx.appcompat.widget.AppCompatImageView
            android:layout_width="20dp"
            android:layout_height="20dp"
            app:srcCompat="@drawable/ic_discover"
            app:tint="?android:textColorSecondary" />
    </LinearLayout>
</FrameLayout>