fanactivity.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.FanActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <android.support.v7.widget.Toolbar
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:titleTextColor="@android:color/white"
            android:background="@color/colorPrimary"
            android:id="@+id/toolbar"/>

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

        <SeekBar
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:id="@+id/fseekBar1"
            android:layout_below="@+id/textView1"
            android:layout_alignParentStart="true"
            android:layout_toStartOf="@+id/ftoggleButton1"/>

        <ToggleButton
            android:text="ToggleButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/ftoggleButton1"
            android:layout_below="@+id/textView1"
            android:layout_alignParentEnd="true"/>
        <TextView
            android:text="Fan 2"
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:id="@+id/textView2"
            android:layout_below="@+id/fseekBar1"
            android:textAppearance="@style/TextAppearance.AppCompat.Display1" />

        <SeekBar
            android:layout_width="200dp"
            android:layout_height="50dp"
            android:id="@+id/fseekBar2"
            android:layout_below="@+id/textView2"
            android:layout_alignParentStart="true"
            android:layout_toStartOf="@+id/ftoggleButton2"/>

        <ToggleButton
            android:text="ToggleButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/ftoggleButton2"
            android:layout_below="@+id/textView2"
            android:layout_alignParentEnd="true"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/sendbutton2"
            android:layout_alignParentBottom="true"
            android:layout_below="@+id/fseekBar2"
            android:layout_marginEnd="77dp"
            android:text="Send" />

    </RelativeLayout>
</ScrollView>