Threema-Android-mirror/app/src/main/res/layout/activity_simple_webview.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?android:attr/colorBackground">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:liftOnScroll="true"
        app:liftOnScrollTargetViewId="@+id/webview_scroller">

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <com.google.android.material.appbar.MaterialToolbar
                android:id="@+id/material_toolbar"
                style="@style/Threema.ToolbarStyle"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="@android:color/transparent"
                app:navigationIcon="?attr/homeAsUpIndicator" />

            <include layout="@layout/connection_indicator" />

            <com.google.android.material.progressindicator.LinearProgressIndicator
                android:id="@+id/progress"
                android:layout_width="match_parent"
                android:layout_height="2dp"
                android:layout_gravity="bottom"
                android:indeterminate="false" />

        </FrameLayout>

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.core.widget.NestedScrollView
        android:id="@+id/webview_scroller"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:scrollbars="vertical"
        app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior">

        <WebView
            android:id="@+id/simple_webview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="?android:attr/colorBackground"
            android:scrollbars="none" />

    </androidx.core.widget.NestedScrollView>

</androidx.coordinatorlayout.widget.CoordinatorLayout>