lightactivity.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.example.android.digitalhome.LightActivity">

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

        <TextView
            android:text="Bulb 1"
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:id="@+id/textView1"
            android:textAppearance="@style/TextAppearance.AppCompat.Display1" />

        <SeekBar
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:id="@+id/lseekBar1"
            android:layout_below="@+id/textView1"
            android:layout_alignParentStart="true"
            android:layout_toStartOf="@+id/ltoggleButton1" />

        <ToggleButton
            android:text="ToggleButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/ltoggleButton1"
            android:layout_below="@+id/textView1"
            android:layout_alignParentEnd="true" />
        <TextView
            android:text="Bulb 2"
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:id="@+id/textView2"
            android:layout_below="@+id/lseekBar1"
            android:textAppearance="@style/TextAppearance.AppCompat.Display1" />

        <SeekBar
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:id="@+id/lseekBar2"
            android:layout_below="@+id/textView2"
            android:layout_alignParentStart="true"
            android:layout_toStartOf="@+id/ltoggleButton2" />

        <ToggleButton
            android:text="ToggleButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/ltoggleButton2"
            android:layout_below="@+id/textView2"
            android:layout_alignParentEnd="true" />


        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/sendbutton1"
            android:layout_alignParentBottom="true"
            android:layout_below="@+id/lseekBar2"
            android:layout_marginEnd="77dp"
            android:text="Send" />
    </RelativeLayout>
</ScrollView>