<RelativeLayout 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"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".RecordingActivity">

    <Button
        android:text="Record city sounds"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</RelativeLayout>

<LinearLayout 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"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".RecordingActivity">

    <Button
        android:text="Record"
        android:id="@+id/record_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:text="Play"
        android:id="@+id/play_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

Add IDs to buttons as well as missing button
Add IDs to buttons as well as missing button
