apps/OboeTester/app/src/main/res/layout/activity_tap_to_tone.xml

<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:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.google.sample.oboe.manualtest.TapToToneActivity">

    <include layout="@layout/merge_audio_common"/>

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

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="MIDI:" />

        <Spinner
            android:id="@+id/spinner_synth_sender"
            style="@android:style/TextAppearance.Large"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:entries="@array/senders" />
    </LinearLayout>

    <TextView
        android:id="@+id/resultView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:lines="2"
        android:textSize="18sp"
        android:textStyle="bold"
        android:text="@string/init_result" />

    <com.google.sample.oboe.manualtest.WaveformView
        android:id="@+id/waveview_audio"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />


</LinearLayout>