Gadgetbridge/app/src/main/res/layout/qhybrid_activity_widget_settings.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".devices.qhybrid.WidgetSettingsActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:weightSum="1">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="widget name" />

            <EditText
                android:id="@+id/qhybrid_widget_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="elements" />

            <ListView
                android:id="@+id/qhybrid_widget_elements_list"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="0.4" />

            <Button
                android:id="@+id/qhybrid_widget_elements_add"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="add element" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:weightSum="1">


            <Button
                android:id="@+id/qhybrid_widget_delete"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="delete"
                android:layout_weight="0.5" />

            <Button
                android:id="@+id/qhybrid_widget_save"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="save"
                android:layout_weight="0.5" />

        </LinearLayout>

    </RelativeLayout>

</androidx.constraintlayout.widget.ConstraintLayout>