activity_second.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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/grey_background"
    tools:context=".SecondActivity">

    <!-- Title TextView -->
    <TextView
        android:id="@+id/tvTitle"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@color/grey_background"
        android:gravity="center"
        android:padding="16dp"
        android:text="@string/list_title"
        android:textColor="@android:color/white"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <!-- SwipeRefreshLayout -->
    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
        android:id="@+id/swipeRefreshLayout"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tvTitle">

        <!-- RecyclerView for device list -->
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerViewDevices"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:clipToPadding="false"
            android:paddingStart="8dp"
            android:paddingTop="16dp"
            android:paddingEnd="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

    <!-- Loading overlay (initially hidden) -->
    <LinearLayout
        android:id="@+id/loadingLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#80000000"
        android:gravity="center"
        android:orientation="vertical"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <!-- ProgressBar for loading -->
        <ProgressBar
            android:id="@+id/progressBar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:indeterminate="true" />

        <!-- TextView to show "Searching Device" message -->
        <TextView
            android:id="@+id/loaderText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:text="@string/searching_devices"
            android:textColor="@android:color/white"
            android:textSize="18sp"
            android:padding="12dp"
            android:gravity="center"/>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>