Quelle  emoji_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?attr/emoji_picker_background_main"
    android:gravity="center"
    android:orientation="vertical">

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="?attr/emoji_picker_divider" />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="?attr/emoji_picker_top_divider" />

    <ch.threema.app.emojis.EmojiSearchWidget
        android:id="@+id/emoji_search"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:visibility="gone" />

    <RelativeLayout
        android:id="@+id/emoji_picker_header"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:background="?attr/emoji_picker_background_top">

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/sliding_tabs"
            android:layout_width="match_parent"
            android:layout_height="39dp"
            android:layout_alignParentLeft="true"
            android:layout_toLeftOf="@+id/additions_layout"
            android:background="?attr/emoji_picker_background_top"
            app:tabGravity="start"
            app:tabIconTint="?attr/colorOnSurface"
            app:tabIndicatorHeight="2dp"
            app:tabMaxWidth="@dimen/emoji_picker_tab_width"
            app:tabMode="scrollable"
            app:tabPaddingEnd="0dp"
            app:tabPaddingStart="0dp" />

        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_alignParentBottom="true"
            android:layout_toLeftOf="@+id/additions_layout"
            android:background="?attr/emoji_picker_divider" />

        <LinearLayout
            android:id="@+id/additions_layout"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:background="?attr/emoji_picker_background_main"
            android:orientation="horizontal">

            <View
                android:layout_width="1dp"
                android:layout_height="match_parent"
                android:layout_gravity="left"
                android:background="?attr/emoji_picker_divider" />

            <ImageButton
                android:id="@+id/search_button"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:background="?android:attr/selectableItemBackground"
                android:contentDescription="@string/emoji_search"
                android:paddingLeft="16dp"
                android:paddingRight="16dp"
                android:src="@drawable/emoji_category_search"
                android:visibility="gone"
                app:tint="?attr/colorOnSurface" />

            <LinearLayout
                android:id="@+id/backspace_button"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:background="?android:attr/selectableItemBackground"
                android:clickable="true">

                <ImageView
                    android:id="@+id/backspace_button_image"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_marginLeft="16dp"
                    android:layout_marginRight="16dp"
                    android:contentDescription="@string/delete"
                    app:srcCompat="@drawable/ic_backspace_outline"
                    app:tint="?attr/colorOnSurface" />
            </LinearLayout>

        </LinearLayout>

    </RelativeLayout>

    <ch.threema.app.ui.LockableViewPager
        android:id="@+id/emoji_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>