Quelle  activity_directory.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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/parent_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?android:attr/colorBackground">

    <LinearLayout
        android:id="@+id/initial_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        tools:ignore="UseCompoundDrawables"
        tools:visibility="gone">

        <ImageView
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_gravity="center_horizontal"
            android:layout_marginVertical="@dimen/grid_unit_x4"
            android:importantForAccessibility="no"
            android:src="@drawable/ic_contacts_outline"
            app:tint="?attr/colorOnSurface" />

        <TextView
            android:id="@+id/explain_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginHorizontal="@dimen/grid_unit_x2"
            android:gravity="center_horizontal"
            android:text="@string/directory_explain_text"
            android:textAlignment="center"
            android:textAppearance="@style/Threema.TextAppearance.EmptyView" />

    </LinearLayout>

    <FrameLayout
        android:id="@+id/results_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?android:attr/colorBackground"
        android:orientation="vertical"
        android:visibility="gone"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        tools:visibility="visible">

        <TextView
            android:id="@+id/empty_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/grid_unit_x4"
            android:gravity="center_horizontal"
            android:paddingHorizontal="@dimen/grid_unit_x2"
            android:textAlignment="center"
            android:textAppearance="@style/Threema.TextAppearance.EmptyView" />

        <ch.threema.app.ui.EmptyRecyclerView
            android:id="@+id/recycler"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="@dimen/grid_unit_x0_5"
            android:clipToPadding="false"
            tools:listitem="@layout/item_directory" />

    </FrameLayout>

    <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/recycler">

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

            <com.google.android.material.search.SearchBar
                android:id="@+id/toolbar"
                style="@style/Threema.SearchBar.Style"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:defaultMarginsEnabled="true"
                app:navigationIcon="?attr/homeAsUpIndicator" />

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

        </FrameLayout>

        <HorizontalScrollView
            android:id="@+id/chip_group_scroll_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:clipToPadding="false"
            android:paddingHorizontal="@dimen/grid_unit_x2"
            android:paddingBottom="@dimen/grid_unit_x1"
            android:scrollbarSize="0dp"
            android:scrollbars="none">

            <com.google.android.material.chip.ChipGroup
                android:id="@+id/chip_group"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:animateLayoutChanges="true"
                android:visibility="gone"
                app:chipSpacingHorizontal="@dimen/grid_unit_x0_5"
                app:chipSpacingVertical="0dp"
                app:singleLine="true"
                tools:visibility="visible" />

        </HorizontalScrollView>

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

    <com.google.android.material.progressindicator.LinearProgressIndicator
        android:id="@+id/progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:indeterminate="true"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>