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

<?xml version="1.0" encoding="utf-8"?>
<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.TestOutputActivity">

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

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

        <TextView
            android:id="@+id/channelText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Channels:" />

        <CheckBox
            android:id="@+id/channelBox0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onChannelBoxClicked"
            android:text="0" />

        <CheckBox
            android:id="@+id/channelBox1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onChannelBoxClicked"
            android:text="1" />

        <CheckBox
            android:id="@+id/channelBox2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onChannelBoxClicked"
            android:text="2" />

        <CheckBox
            android:id="@+id/channelBox3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onChannelBoxClicked"
            android:text="3" />

        <CheckBox
            android:id="@+id/channelBox4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onChannelBoxClicked"
            android:text="4" />

        <CheckBox
            android:id="@+id/channelBox5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onChannelBoxClicked"
            android:text="5" />

        <CheckBox
            android:id="@+id/channelBox6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onChannelBoxClicked"
            android:text="6" />

        <CheckBox
            android:id="@+id/channelBox7"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onChannelBoxClicked"
            android:text="7" />

    </LinearLayout>
</LinearLayout>