HC05AC-CTRL/src/bt/res/layout/activity_device_list.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".bt.DeviceListActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="8dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/textView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/device_list_title"
                android:textColor="#0033FF"
                android:textSize="16sp"
                tools:layout_editor_absoluteX="168dp"
                tools:layout_editor_absoluteY="134dp" />

            <Button
                android:id="@+id/button"
                style="@style/Widget.AppCompat.Button.Colored"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@android:color/holo_blue_light"
                android:text="@string/device_list_refresh"
                tools:layout_editor_absoluteX="190dp"
                tools:layout_editor_absoluteY="183dp" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">

            <ListView
                android:id="@+id/listView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginLeft="150dp"
                android:layout_marginStart="150dp"
                android:footerDividersEnabled="false"
                tools:layout_editor_absoluteX="8dp"
                tools:layout_editor_absoluteY="8dp" />
        </LinearLayout>

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>