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

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

    <data>
        <import type="android.view.View" />
        <variable
            name="viewModel"
            type="org.linphone.activities.call.viewmodels.ControlsViewModel" />
    </data>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="300dp">

        <View
            android:id="@+id/vertical_divider_2"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_centerHorizontal="true" />

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_toLeftOf="@id/vertical_divider_2">

            <View
                android:id="@+id/left_vertical_divider_2"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_centerHorizontal="true" />

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="@dimen/call_button_size"
                android:layout_alignParentBottom="true"
                android:layout_toLeftOf="@id/left_vertical_divider_2">

                <ImageView
                    android:onClick="@{() -> viewModel.toggleVideo()}"
                    android:selected="@{viewModel.isVideoEnabled}"
                    android:enabled="@{viewModel.isVideoAvailable &amp;&amp; !viewModel.isVideoUpdateInProgress}"
                    android:contentDescription="@{viewModel.isVideoEnabled ? @string/content_description_disable_video : @string/content_description_enable_video}"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="?attr/button_background_drawable"
                    android:padding="20dp"
                    android:src="@drawable/camera" />

                <ProgressBar
                    android:visibility="@{viewModel.isVideoUpdateInProgress ? View.VISIBLE : View.GONE, default=gone}"
                    style="?android:attr/progressBarStyle"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true"
                    android:layout_centerVertical="true" />

            </RelativeLayout>

            <ImageView
                android:onClick="@{() -> viewModel.toggleMuteMicrophone()}"
                android:selected="@{viewModel.isMicrophoneMuted}"
                android:enabled="@{viewModel.isMuteMicrophoneEnabled}"
                android:contentDescription="@{viewModel.isMicrophoneMuted ? @string/content_description_disable_mic_mute : @string/content_description_enable_mic_mute}"
                android:layout_width="match_parent"
                android:layout_height="@dimen/call_button_size"
                android:layout_toRightOf="@id/left_vertical_divider_2"
                android:layout_alignParentBottom="true"
                android:background="?attr/button_background_drawable"
                android:padding="10dp"
                android:src="@drawable/micro" />

        </RelativeLayout>

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_toRightOf="@id/vertical_divider_2">

            <View
                android:id="@+id/right_vertical_divider_2"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_centerHorizontal="true" />

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_toLeftOf="@id/right_vertical_divider_2">

                <ImageView
                    android:onClick="@{() -> viewModel.toggleSpeaker()}"
                    android:selected="@{viewModel.isSpeakerSelected}"
                    android:visibility="@{viewModel.audioRoutesEnabled ? View.GONE : View.VISIBLE}"
                    android:contentDescription="@{viewModel.isSpeakerSelected ? @string/content_description_disable_speaker : @string/content_description_enable_speaker}"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/call_button_size"
                    android:layout_alignParentBottom="true"
                    android:background="?attr/button_background_drawable"
                    android:padding="15dp"
                    android:src="@drawable/speaker" />

                <LinearLayout
                    android:id="@+id/audio_routes_menu"
                    android:translationY="@{viewModel.audioRoutesMenuTranslateY, default=@dimen/call_audio_routes_menu_translate_y}"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_above="@id/audio_routes"
                    android:orientation="vertical">

                    <ImageView
                        android:selected="@{viewModel.isBluetoothHeadsetSelected}"
                        android:onClick="@{() -> viewModel.forceBluetoothAudioRoute()}"
                        android:contentDescription="@string/content_description_use_bluetooth_headset"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/call_button_size"
                        android:background="?attr/button_background_drawable"
                        android:padding="15dp"
                        android:src="@drawable/route_bluetooth" />

                    <ImageView
                        android:selected="@{!viewModel.isSpeakerSelected &amp;&amp; !viewModel.isBluetoothHeadsetSelected}"
                        android:onClick="@{() -> viewModel.forceEarpieceAudioRoute()}"
                        android:contentDescription="@string/content_description_use_earpiece"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/call_button_size"
                        android:background="?attr/button_background_drawable"
                        android:padding="15dp"
                        android:src="@drawable/route_earpiece" />

                    <ImageView
                        android:selected="@{viewModel.isSpeakerSelected}"
                        android:onClick="@{() -> viewModel.forceSpeakerAudioRoute()}"
                        android:contentDescription="@string/content_description_use_speaker"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/call_button_size"
                        android:background="?attr/button_background_drawable"
                        android:padding="15dp"
                        android:src="@drawable/route_speaker" />

                </LinearLayout>

                <ImageView
                    android:id="@+id/audio_routes"
                    android:onClick="@{() -> viewModel.toggleRoutesMenu()}"
                    android:visibility="@{viewModel.audioRoutesEnabled ? View.VISIBLE : View.INVISIBLE, default=invisible}"
                    android:selected="@{viewModel.audioRoutesVisibility}"
                    android:contentDescription="@string/content_description_toggle_audio_menu"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/call_button_size"
                    android:layout_alignParentBottom="true"
                    android:background="?attr/button_background_drawable"
                    android:padding="15dp"
                    android:src="@drawable/routes" />

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_toRightOf="@id/right_vertical_divider_2">

                <LinearLayout
                    android:id="@+id/options_menu"
                    android:translationY="@{viewModel.optionsMenuTranslateY, default=@dimen/call_options_menu_translate_y}"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_above="@id/options"
                    android:orientation="vertical">

                    <ImageView
                        android:onClick="@{() -> viewModel.startConference()}"
                        android:enabled="@{viewModel.isConferencingAvailable}"
                        android:contentDescription="@string/content_description_start_conference"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/call_button_size"
                        android:background="?attr/button_background_drawable"
                        android:padding="15dp"
                        android:src="@drawable/options_start_conference" />

                    <ImageView
                        android:onClick="@{() -> viewModel.onTransferCallClicked()}"
                        android:contentDescription="@string/content_description_transfer_call"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/call_button_size"
                        android:background="?attr/button_background_drawable"
                        android:padding="15dp"
                        android:src="@drawable/options_transfer_call" />

                    <ImageView
                        android:onClick="@{() -> viewModel.onAddCallClicked()}"
                        android:contentDescription="@string/content_description_add_call"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/call_button_size"
                        android:background="?attr/button_background_drawable"
                        android:padding="15dp"
                        android:src="@drawable/options_add_call" />

                    <ImageView
                        android:onClick="@{() -> viewModel.toggleRecording(true)}"
                        android:selected="@{viewModel.isRecording}"
                        android:contentDescription="@string/content_description_toggle_recording"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/call_button_size"
                        android:background="?attr/button_background_drawable"
                        android:padding="15dp"
                        android:src="@drawable/options_rec" />

                </LinearLayout>

                <ImageView
                    android:id="@+id/options"
                    android:onClick="@{() -> viewModel.toggleOptionsMenu()}"
                    android:selected="@{viewModel.optionsVisibility}"
                    android:contentDescription="@string/content_description_toggle_call_menu"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/call_button_size"
                    android:layout_alignParentBottom="true"
                    android:background="?attr/button_background_drawable"
                    android:padding="15dp"
                    android:src="@drawable/options" />

            </RelativeLayout>

        </RelativeLayout>

    </RelativeLayout>

</layout>