Quelle  activity_media_gallery.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:layout_width="match_parent"
    android:layout_height="match_parent">

    <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/item_list">

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

            <com.google.android.material.appbar.MaterialToolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                tools:navigationIcon="?attr/homeAsUpIndicator"
                tools:title="Conversation Name" />

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

        </FrameLayout>

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

    <LinearLayout
        android:id="@+id/content_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="?android:attr/colorBackground"
        android:orientation="vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <com.google.android.material.chip.ChipGroup
            android:id="@+id/chip_group_content_types"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:animateLayoutChanges="true"
            android:paddingHorizontal="@dimen/grid_unit_x2"
            android:paddingVertical="@dimen/grid_unit_x1"
            app:chipSpacingHorizontal="@dimen/grid_unit_x0_5"
            app:chipSpacingVertical="0dp"
            app:lineSpacing="0dp">

            <com.google.android.material.chip.Chip
                android:id="@+id/content_type_image"
                style="@style/Widget.Material3.Chip.Filter"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/media_gallery_pictures"
                tools:checked="true" />

            <com.google.android.material.chip.Chip
                android:id="@+id/content_type_gif"
                style="@style/Widget.Material3.Chip.Filter"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/media_gallery_gifs"
                tools:checked="true" />

            <com.google.android.material.chip.Chip
                android:id="@+id/content_type_video"
                style="@style/Widget.Material3.Chip.Filter"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/media_gallery_videos" />

            <com.google.android.material.chip.Chip
                android:id="@+id/content_type_voice_message"
                style="@style/Widget.Material3.Chip.Filter"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/media_gallery_audio" />

            <com.google.android.material.chip.Chip
                android:id="@+id/content_type_audio"
                style="@style/Widget.Material3.Chip.Filter"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/audio_placeholder" />

            <com.google.android.material.chip.Chip
                android:id="@+id/content_type_file"
                style="@style/Widget.Material3.Chip.Filter"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/media_gallery_files"
                tools:checked="true" />

        </com.google.android.material.chip.ChipGroup>

        <!-- This wrapper view-group is needed because of the EmptyView inflated manually -->
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <ch.threema.app.ui.EmptyRecyclerView
                android:id="@+id/item_list"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:clipToPadding="false"
                android:paddingHorizontal="@dimen/grid_spacing"
                tools:itemCount="3"
                tools:listitem="@layout/item_media_gallery" />

        </FrameLayout>

    </LinearLayout>

</androidx.coordinatorlayout.widget.CoordinatorLayout>