linphone-android/app/src/main/res/layout/settings_audio_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:linphone="http://schemas.android.com/apk/res-auto">

    <data>
        <import type="android.view.View"/>
        <import type="android.text.InputType"/>
        <variable
            name="backClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="viewModel"
            type="org.linphone.activities.main.settings.viewmodels.AudioSettingsViewModel"/>
    </data>

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

        <LinearLayout
            android:id="@+id/top_bar"
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:layout_gravity="center_horizontal"
            android:background="?attr/lightToolbarBackgroundColor"
            android:orientation="horizontal">

            <ImageView
                android:id="@+id/back"
                android:onClick="@{backClickListener}"
                android:contentDescription="@string/content_description_go_back"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.2"
                android:background="?attr/button_background_drawable"
                android:padding="18dp"
                android:src="@drawable/back" />

            <TextView
                style="@style/accent_colored_title_font"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.6"
                android:gravity="center"
                android:singleLine="true"
                android:ellipsize="end"
                android:padding="15dp"
                android:text="@string/settings_audio_title"/>

            <View
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.2"
                android:visibility="invisible" />

        </LinearLayout>

        <androidx.core.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@id/top_bar">

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

                <include
                    layout="@layout/settings_widget_switch"
                    linphone:title="@{@string/audio_settings_echo_cancellation_title}"
                    linphone:subtitle="@{@string/audio_settings_echo_cancellation_summary}"
                    linphone:listener="@{viewModel.echoCancellationListener}"
                    linphone:checked="@={viewModel.echoCancellation}"/>

                <include
                    layout="@layout/settings_widget_basic"
                    linphone:title="@{@string/audio_settings_echo_canceller_calibration_title}"
                    linphone:subtitle="@{viewModel.echoCalibration}"
                    linphone:listener="@{viewModel.echoCancellerCalibrationListener}"/>

                <include
                    layout="@layout/settings_widget_basic"
                    linphone:title="@{@string/audio_settings_echo_tester_title}"
                    linphone:subtitle="@{viewModel.echoTesterStatus}"
                    linphone:listener="@{viewModel.echoTesterListener}"/>

                <include
                    layout="@layout/settings_widget_switch"
                    linphone:title="@{@string/audio_settings_adaptive_rate_control_title}"
                    linphone:subtitle="@{@string/audio_settings_adaptive_rate_control_summary}"
                    linphone:listener="@{viewModel.adaptiveRateControlListener}"
                    linphone:checked="@={viewModel.adaptiveRateControl}"/>

                <include
                    layout="@layout/settings_widget_list"
                    linphone:title="@{@string/audio_settings_input_device_title}"
                    linphone:subtitle="@{@string/audio_settings_input_device_summary}"
                    linphone:listener="@{viewModel.inputAudioDeviceListener}"
                    linphone:selectedIndex="@{viewModel.inputAudioDeviceIndex}"
                    linphone:labels="@{viewModel.inputAudioDeviceLabels}"/>

                <include
                    layout="@layout/settings_widget_list"
                    linphone:title="@{@string/audio_settings_output_device_title}"
                    linphone:subtitle="@{@string/audio_settings_output_device_summary}"
                    linphone:listener="@{viewModel.outputAudioDeviceListener}"
                    linphone:selectedIndex="@{viewModel.outputAudioDeviceIndex}"
                    linphone:labels="@{viewModel.outputAudioDeviceLabels}"/>

                <include
                    layout="@layout/settings_widget_list"
                    linphone:title="@{@string/audio_settings_codec_bitrate_title}"
                    linphone:subtitle="@{@string/audio_settings_codec_bitrate_summary}"
                    linphone:listener="@{viewModel.codecBitrateListener}"
                    linphone:selectedIndex="@{viewModel.codecBitrateIndex}"
                    linphone:labels="@{viewModel.codecBitrateLabels}"/>

                <include
                    layout="@layout/settings_widget_text"
                    linphone:title="@{@string/audio_settings_microphone_gain_title}"
                    linphone:subtitle="@{@string/audio_settings_microphone_gain_summary}"
                    linphone:listener="@{viewModel.microphoneGainListener}"
                    linphone:defaultValue="@{viewModel.microphoneGain.toString()}"
                    linphone:inputType="@{InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL}"/>

                <include
                    layout="@layout/settings_widget_text"
                    linphone:title="@{@string/audio_settings_playback_gain_title}"
                    linphone:subtitle="@{@string/audio_settings_playback_gain_summary}"
                    linphone:listener="@{viewModel.playbackGainListener}"
                    linphone:defaultValue="@{viewModel.playbackGain.toString()}"
                    linphone:inputType="@{InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL}"/>

                <TextView
                    style="@style/settings_category_font"
                    android:id="@+id/pref_video_codecs_header"
                    android:text="@string/audio_settings_codecs_title"
                    android:paddingTop="15dp"
                    android:layout_marginLeft="10dp"
                    android:layout_marginRight="10dp"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"/>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical"
                    linphone:entries="@{viewModel.audioCodecs}"/>

            </LinearLayout>

        </androidx.core.widget.NestedScrollView>

    </RelativeLayout>

</layout>