[RN] Add audio route picker

Due to the difference in nature, the iOS and Android implementations are
completely different:

iOS: MPVolumeView is used, which allows us to place a button which will launch a
native route picker provided by iOS itself. This view is different depending on
the iOS version, with the iOS 11 version being more complete.

Android: A completely custom component is used, which displays a bottom sheet
with the device categories, not devices individually. This is akin to the sheet
in the builtin dialer.

android/sdk/src/main/java/org/jitsi/meet/sdk/AudioModeModule.java

@@ -21,6 +21,7 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.PackageManager;
 import android.media.AudioDeviceInfo;
 import android.media.AudioManager;
 import android.os.Build;
@@ -28,13 +29,19 @@ import android.os.Handler;
 import android.os.Looper;
 import android.util.Log;
 
+import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.Promise;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
+import com.facebook.react.bridge.WritableArray;
+import com.facebook.react.bridge.WritableMap;
 
+import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 /**
  * Module implementing a simple API to select the appropriate audio device for a
@@ -102,10 +109,53 @@ class AudioModeModule extends ReactContextBaseJavaModule {
     private final Handler mainThreadHandler
         = new Handler(Looper.getMainLooper());
 
+    /**
+     * {@link Runnable} for running audio device detection the main thread.
+     * This is only used on Android >= M.
+     */
+    private final Runnable onAudioDeviceChangeRunner = new Runnable() {
+        @TargetApi(Build.VERSION_CODES.M)
+        @Override
+        public void run() {
+            Set<String> devices = new HashSet<>();
+            AudioDeviceInfo[] deviceInfos
+                = audioManager.getDevices(AudioManager.GET_DEVICES_ALL);
+
+            for (AudioDeviceInfo info: deviceInfos) {
+                switch (info.getType()) {
+                case AudioDeviceInfo.TYPE_BLUETOOTH_SCO:
+                    devices.add(DEVICE_BLUETOOTH);
+                    break;
+                case AudioDeviceInfo.TYPE_BUILTIN_EARPIECE:
+                    devices.add(DEVICE_EARPIECE);
+                    break;
+                case AudioDeviceInfo.TYPE_BUILTIN_SPEAKER:
+                    devices.add(DEVICE_SPEAKER);
+                    break;
+                case AudioDeviceInfo.TYPE_WIRED_HEADPHONES:
+                case AudioDeviceInfo.TYPE_WIRED_HEADSET:
+                    devices.add(DEVICE_HEADPHONES);
+                    break;
+                }
+            }
+
+            availableDevices = devices;
+            Log.d(TAG, "Available audio devices: " +
+                availableDevices.toString());
+
+            // Reset user selection
+            userSelectedDevice = null;
+
+            if (mode != -1) {
+                updateAudioRoute(mode);
+            }
+        }
+    };
+
     /**
      * {@link Runnable} for running update operation on the main thread.
      */
-    private final Runnable mainThreadRunner
+    private final Runnable updateAudioRouteRunner
         = new Runnable() {
             @Override
             public void run() {
@@ -120,6 +170,30 @@ class AudioModeModule extends ReactContextBaseJavaModule {
      */
     private int mode = -1;
 
+    /**
+     * Audio device types.
+     */
+    private static final String DEVICE_BLUETOOTH  = "BLUETOOTH";
+    private static final String DEVICE_EARPIECE   = "EARPIECE";
+    private static final String DEVICE_HEADPHONES = "HEADPHONES";
+    private static final String DEVICE_SPEAKER    = "SPEAKER";
+
+    /**
+     * List of currently available audio devices.
+     */
+    private Set<String> availableDevices = Collections.emptySet();
+
+    /**
+     * Currently selected device.
+     */
+    private String selectedDevice;
+
+    /**
+     * User selected device. When null the default is used depending on the
+     * mode.
+     */
+    private String userSelectedDevice;
+
     /**
      * Initializes a new module instance. There shall be a single instance of
      * this module throughout the lifetime of the application.
@@ -136,6 +210,20 @@ class AudioModeModule extends ReactContextBaseJavaModule {
 
         // Setup runtime device change detection.
         setupAudioRouteChangeDetection();
+
+        // Do an initial detection on Android >= M.
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+            mainThreadHandler.post(onAudioDeviceChangeRunner);
+        } else {
+            // On Android < M, detect if we have an earpiece.
+            PackageManager pm = reactContext.getPackageManager();
+            if (pm.hasSystemFeature(PackageManager.FEATURE_TELEPHONY)) {
+                availableDevices.add(DEVICE_EARPIECE);
+            }
+
+            // Always assume there is a speaker.
+            availableDevices.add(DEVICE_SPEAKER);
+        }
     }
 
     /**
@@ -155,6 +243,36 @@ class AudioModeModule extends ReactContextBaseJavaModule {
         return constants;
     }
 
+    /**
+     * Gets the list of available audio device categories, i.e. 'bluetooth',
+     * 'earpiece ', 'speaker', 'headphones'.
+     *
+     * @param promise a {@link Promise} which will be resolved with an object
+     *                containing a 'devices' key with a list of devices, plus a
+     *                'selected' key with the selected one.
+     */
+    @ReactMethod
+    public void getAudioDevices(final Promise promise) {
+        mainThreadHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                WritableMap map = Arguments.createMap();
+                map.putString("selected", selectedDevice);
+                WritableArray devices = Arguments.createArray();
+                for (String device : availableDevices) {
+                    if (mode == VIDEO_CALL && device.equals(DEVICE_EARPIECE)) {
+                        // Skip earpiece when in video call mode.
+                        continue;
+                    }
+                    devices.pushString(device);
+                }
+                map.putArray("devices", devices);
+
+                promise.resolve(map);
+            }
+        });
+    }
+
     /**
      * Gets the name for this module to be used in the React Native bridge.
      *
@@ -168,9 +286,81 @@ class AudioModeModule extends ReactContextBaseJavaModule {
     /**
      * Helper method to trigger an audio route update when devices change. It
      * makes sure the operation is performed on the main thread.
+     *
+     * Only used on Android >= M.
      */
     void onAudioDeviceChange() {
-        mainThreadHandler.post(mainThreadRunner);
+        mainThreadHandler.post(onAudioDeviceChangeRunner);
+    }
+
+    /**
+     * Helper method to trigger an audio route update when Bluetooth devices are
+     * connected / disconnected.
+     *
+     * Only used on Android < M. Runs on the main thread.
+     */
+    void onBluetoothDeviceChange() {
+        if (bluetoothHeadsetMonitor.isHeadsetAvailable()) {
+            availableDevices.add(DEVICE_BLUETOOTH);
+        } else {
+            availableDevices.remove(DEVICE_BLUETOOTH);
+        }
+
+        if (mode != -1) {
+            updateAudioRoute(mode);
+        }
+    }
+
+    /**
+     * Helper method to trigger an audio route update when a headset is plugged
+     * or unplugged.
+     *
+     * Only used on Android < M.
+     */
+    void onHeadsetDeviceChange() {
+        mainThreadHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                // XXX: isWiredHeadsetOn is not deprecated when used just for
+                // knowing if there is a wired headset connected, regardless of
+                // audio being routed to it.
+                //noinspection deprecation
+                if (audioManager.isWiredHeadsetOn()) {
+                    availableDevices.add(DEVICE_HEADPHONES);
+                } else {
+                    availableDevices.remove(DEVICE_HEADPHONES);
+                }
+
+                if (mode != -1) {
+                    updateAudioRoute(mode);
+                }
+            }
+        });
+    }
+
+    /**
+     * Sets the user selected audio device as the active audio device.
+     *
+     * @param device the desired device which will become active.
+     */
+    @ReactMethod
+    public void setAudioDevice(final String device) {
+        mainThreadHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                if (!availableDevices.contains(device)) {
+                    Log.d(TAG, "Audio device not available: " + device);
+                    userSelectedDevice = null;
+                    return;
+                }
+
+                if (mode != -1) {
+                    Log.d(TAG, "User selected device set to: " + device);
+                    userSelectedDevice = device;
+                    updateAudioRoute(mode);
+                }
+            }
+        });
     }
 
     /**
@@ -278,7 +468,7 @@ class AudioModeModule extends ReactContextBaseJavaModule {
             @Override
             public void onReceive(Context context, Intent intent) {
                 Log.d(TAG, "Wired headset added / removed");
-                onAudioDeviceChange();
+                onHeadsetDeviceChange();
             }
         };
         context.registerReceiver(wiredHeadsetReceiver, wiredHeadSetFilter);
@@ -302,6 +492,8 @@ class AudioModeModule extends ReactContextBaseJavaModule {
             audioManager.abandonAudioFocus(null);
             audioManager.setSpeakerphoneOn(false);
             setBluetoothAudioRoute(false);
+            selectedDevice = null;
+            userSelectedDevice = null;
 
             return true;
         }
@@ -318,31 +510,42 @@ class AudioModeModule extends ReactContextBaseJavaModule {
             return false;
         }
 
-        boolean useSpeaker = (mode == VIDEO_CALL);
+        boolean bluetoothAvailable = availableDevices.contains(DEVICE_BLUETOOTH);
+        boolean earpieceAvailable = availableDevices.contains(DEVICE_EARPIECE);
+        boolean headsetAvailable = availableDevices.contains(DEVICE_HEADPHONES);
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        // Pick the desired device based on what's available and the mode.
-            // On Android >= M we use the AudioDeviceCallback API, so turn on
+        String audioDevice;
-            // Bluetooth SCO from the start.
+        if (bluetoothAvailable) {
-            if (audioManager.isBluetoothScoAvailableOffCall()) {
+            audioDevice = DEVICE_BLUETOOTH;
-                audioManager.startBluetoothSco();
+        } else if (headsetAvailable) {
-            }
+            audioDevice = DEVICE_HEADPHONES;
+        } else if (mode == AUDIO_CALL && earpieceAvailable) {
+            audioDevice = DEVICE_EARPIECE;
         } else {
-            // On older Android versions we must set the Bluetooth route
+            audioDevice = DEVICE_SPEAKER;
-            // manually. Also disable the speaker in that case.
-            setBluetoothAudioRoute(
-                    bluetoothHeadsetMonitor.isHeadsetAvailable());
-            if (bluetoothHeadsetMonitor.isHeadsetAvailable()) {
-                useSpeaker = false;
-            }
         }
 
-        // XXX: isWiredHeadsetOn is not deprecated when used just for knowing if
+        // Consider the user's selection
-        // there is a wired headset connected, regardless of audio being routed
+        if (userSelectedDevice != null
-        // to it.
+                && availableDevices.contains(userSelectedDevice)) {
-        audioManager.setSpeakerphoneOn(
+            audioDevice = userSelectedDevice;
-                useSpeaker
+        }
-                    && !(audioManager.isWiredHeadsetOn()
+
-                        || audioManager.isBluetoothScoOn()));
+        // If the previously selected device and the current default one
+        // match, do nothing.
+        if (selectedDevice != null && selectedDevice.equals(audioDevice)) {
+            return true;
+        }
+
+        selectedDevice = audioDevice;
+        Log.d(TAG, "Selected audio device: " + audioDevice);
+
+        // Turn bluetooth on / off
+        setBluetoothAudioRoute(audioDevice.equals(DEVICE_BLUETOOTH));
+
+        // Turn speaker on / off
+        audioManager.setSpeakerphoneOn(audioDevice.equals(DEVICE_SPEAKER));
 
         return true;
     }

android/sdk/src/main/java/org/jitsi/meet/sdk/BluetoothHeadsetMonitor.java

@@ -71,7 +71,7 @@ class BluetoothHeadsetMonitor {
                 headsetAvailable
                     = (headset != null)
                         && !headset.getConnectedDevices().isEmpty();
-                audioModeModule.onAudioDeviceChange();
+                audioModeModule.onBluetoothDeviceChange();
             }
         };
 

fonts/jitsi.svg

@@ -9,10 +9,13 @@
 <glyph unicode="&#x20;" d="" />
 <glyph unicode="&#xe0cd;" glyph-name="phone" d="M282 564c62-120 162-220 282-282l94 94c12 12 30 16 44 10 48-16 100-24 152-24 24 0 42-18 42-42v-150c0-24-18-42-42-42-400 0-726 326-726 726 0 24 18 42 42 42h150c24 0 42-18 42-42 0-54 8-104 24-152 4-14 2-32-10-44z" />
 <glyph unicode="&#xe145;" glyph-name="add" d="M810 470h-256v-256h-84v256h-256v84h256v256h84v-256h256v-84z" />
+<glyph unicode="&#xe1aa;" glyph-name="bluetooth" d="M550 328l-80 82v-162zM470 776v-162l80 82zM670 696l-184-184 184-184-244-242h-42v324l-196-196-60 60 238 238-238 238 60 60 196-196v324h42zM834 738c40-64 62-142 62-222 0-84-24-160-66-226l-50 50c26 52 42 110 42 172s-16 120-42 172zM608 512l98 98c12-30 20-64 20-98s-8-70-20-100z" />
+<glyph unicode="&#xe310;" glyph-name="headset" d="M512 982c212 0 384-172 384-384v-300c0-70-58-128-128-128h-128v342h170v86c0 166-132 298-298 298s-298-132-298-298v-86h170v-342h-128c-70 0-128 58-128 128v300c0 212 172 384 384 384z" />
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+<glyph unicode="&#xe61d;" glyph-name="phone-talk" d="M640 512c0 70-58 128-128 128v86c118 0 214-96 214-214h-86zM810 512c0 166-132 298-298 298v86c212 0 384-172 384-384h-86zM854 362c24 0 42-18 42-42v-150c0-24-18-42-42-42-400 0-726 326-726 726 0 24 18 42 42 42h150c24 0 42-18 42-42 0-54 8-104 24-152 4-14 2-32-10-44l-94-94c62-122 162-220 282-282l94 94c12 12 30 14 44 10 48-16 98-24 152-24z" />
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fonts/selection.json

@@ -1,6 +1,197 @@
 {
   "IcoMoonType": "selection",
   "icons": [
+    {
+      "icon": {
+        "paths": [
+          "M550 696l-80-82v162zM470 248v162l80-82zM670 328l-184 184 184 184-244 242h-42v-324l-196 196-60-60 238-238-238-238 60-60 196 196v-324h42zM834 286c40 64 62 142 62 222 0 84-24 160-66 226l-50-50c26-52 42-110 42-172s-16-120-42-172zM608 512l98-98c12 30 20 64 20 98s-8 70-20 100z"
+        ],
+        "attrs": [],
+        "isMulticolor": false,
+        "isMulticolor2": false,
+        "tags": [
+          "bluetooth_searching"
+        ],
+        "defaultCode": 57770,
+        "grid": 24
+      },
+      "attrs": [],
+      "properties": {
+        "ligatures": "bluetooth_audio, bluetooth_searching",
+        "id": 79,
+        "order": 911,
+        "prevSize": 24,
+        "code": 57770,
+        "name": "bluetooth"
+      },
+      "setIdx": 0,
+      "setId": 2,
+      "iconIdx": 79
+    },
+    {
+      "icon": {
+        "paths": [
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@@ -293,6 +296,7 @@
 				0BA13D311EE83FF8007BEF7F /* ExternalAPI.m in Sources */,
 				0BCA49601EC4B6C600B793EE /* POSIX.m in Sources */,
 				0BCA495F1EC4B6C600B793EE /* AudioMode.m in Sources */,
+				0B44A0191F902126009D1D64 /* MPVolumeViewManager.m in Sources */,
 				0BCA49611EC4B6C600B793EE /* Proximity.m in Sources */,
 				0B412F191EDEC65D00B1A0A6 /* JitsiMeetView.m in Sources */,
 			);

ios/sdk/src/MPVolumeViewManager.m

@@ -0,0 +1,62 @@
+/*
+ * Copyright @ 2017-present Atlassian Pty Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <React/RCTUIManager.h>
+#import <React/RCTViewManager.h>
+
+@import MediaPlayer;
+
+
+@interface MPVolumeViewManager : RCTViewManager
+@end
+
+@implementation MPVolumeViewManager
+
+RCT_EXPORT_MODULE()
+
+- (UIView *)view {
+    MPVolumeView *volumeView = [[MPVolumeView alloc] init];
+    volumeView.showsRouteButton = YES;
+    volumeView.showsVolumeSlider = NO;
+
+    return (UIView *) volumeView;
+}
+
+RCT_EXPORT_METHOD(show:(nonnull NSNumber *)reactTag) {
+    [self.bridge.uiManager addUIBlock:^(
+                __unused RCTUIManager *uiManager,
+                NSDictionary<NSNumber *, UIView *> *viewRegistry) {
+        id view = viewRegistry[reactTag];
+        if (![view isKindOfClass:[MPVolumeView class]]) {
+            RCTLogError(@"Invalid view returned from registry, expecting \
+                        MPVolumeView, got: %@", view);
+        } else {
+            // Simulate a click
+            UIButton *btn = nil;
+            for (UIView *buttonView in ((UIView *) view).subviews) {
+                if ([buttonView isKindOfClass:[UIButton class]]) {
+                    btn = (UIButton *) buttonView;
+                    break;
+                }
+            }
+            if (btn != nil) {
+                [btn sendActionsForControlEvents:UIControlEventTouchUpInside];
+            }
+        }
+    }];
+}
+
+@end

react/features/mobile/audio-mode/components/AudioRoutePickerDialog.js

@@ -0,0 +1,178 @@
+// @flow
+
+import _ from 'lodash';
+import React, { Component } from 'react';
+import { NativeModules } from 'react-native';
+import { connect } from 'react-redux';
+
+import { hideDialog, SimpleBottomSheet } from '../../../base/dialog';
+
+const AudioMode = NativeModules.AudioMode;
+
+/**
+ * Maps each device type to a display name and icon.
+ * TODO: internationalization.
+ */
+const deviceInfoMap = {
+    BLUETOOTH: {
+        iconName: 'bluetooth',
+        text: 'Bluetooth',
+        type: 'BLUETOOTH'
+    },
+    EARPIECE: {
+        iconName: 'phone-talk',
+        text: 'Phone',
+        type: 'EARPIECE'
+    },
+    HEADPHONES: {
+        iconName: 'headset',
+        text: 'Headphones',
+        type: 'HEADPHONES'
+    },
+    SPEAKER: {
+        iconName: 'volume',
+        text: 'Speaker',
+        type: 'SPEAKER'
+    }
+};
+
+/**
+ * Variable to hold the reference to the exported component. This dialog is only
+ * exported if the {@code AudioMode} module has the capability to get / set
+ * audio devices.
+ */
+let DialogType;
+
+/**
+ * {@code PasswordRequiredPrompt}'s React {@code Component} prop types.
+ */
+type Props = {
+
+    /**
+     * Used for hiding the dialog when the selection was completed.
+     */
+    dispatch: Function
+};
+
+type State = {
+
+    /**
+     * Array of available devices.
+     */
+    devices: Array<string>
+};
+
+/**
+ * Implements a React {@code Component} which prompts the user when a password
+ * is required to join a conference.
+ */
+class AudioRoutePickerDialog extends Component<Props, State> {
+    state = {
+        // Available audio devices, it will be set in componentWillMount.
+        devices: []
+    };
+
+    /**
+     * Initializes a new {@code PasswordRequiredPrompt} instance.
+     *
+     * @param {Props} props - The read-only React {@code Component} props with
+     * which the new instance is to be initialized.
+     */
+    constructor(props) {
+        super(props);
+
+        // Bind event handlers so they are only bound once per instance.
+        this._onCancel = this._onCancel.bind(this);
+        this._onSubmit = this._onSubmit.bind(this);
+    }
+
+    /**
+     * Initializes the device list by querying the {@code AudioMode} module.
+     *
+     * @inheritdoc
+     */
+    componentWillMount() {
+        AudioMode.getAudioDevices().then(({ devices, selected }) => {
+            const audioDevices = [];
+
+            if (devices) {
+                for (const device of devices) {
+                    const info = deviceInfoMap[device];
+
+                    if (info) {
+                        info.selected = device === selected;
+                        audioDevices.push(info);
+                    }
+                }
+            }
+
+            if (audioDevices) {
+                // Make sure devices is alphabetically sorted
+                this.setState({ devices: _.sortBy(audioDevices, 'text') });
+            }
+        });
+    }
+
+    /**
+     * Dispatches a redux action to hide this sheet.
+     *
+     * @returns {void}
+     */
+    _hide() {
+        this.props.dispatch(hideDialog(DialogType));
+    }
+
+    _onCancel: () => void;
+
+    /**
+     * Cancels the dialog by hiding it.
+     *
+     * @private
+     * @returns {void}
+     */
+    _onCancel() {
+        this._hide();
+    }
+
+    _onSubmit: (?Object) => void;
+
+    /**
+     * Handles the selection of a device on the sheet. The selected device will
+     * be used by {@code AudioMode}.
+     *
+     * @param {Object} device - Object representing the selected device.
+     * @private
+     * @returns {void}
+     */
+    _onSubmit(device) {
+        this._hide();
+        AudioMode.setAudioDevice(device.type);
+    }
+
+    /**
+     * Implements React's {@link Component#render()}.
+     *
+     * @inheritdoc
+     * @returns {ReactElement}
+     */
+    render() {
+        if (!this.state.devices.length) {
+            return null;
+        }
+
+        return (
+            <SimpleBottomSheet
+                onCancel = { this._onCancel }
+                onSubmit = { this._onSubmit }
+                options = { this.state.devices } />
+        );
+    }
+}
+
+// Only export the dialog if we have support for getting / setting audio devices
+// in AudioMode.
+if (AudioMode.getAudioDevices && AudioMode.setAudioDevice) {
+    DialogType = connect()(AudioRoutePickerDialog);
+}
+
+export default DialogType;

react/features/mobile/audio-mode/components/index.js

@@ -0,0 +1,3 @@
+export {
+    default as AudioRoutePickerDialog
+} from './AudioRoutePickerDialog';

react/features/mobile/audio-mode/index.js

@@ -1 +1,3 @@
+export * from './components';
+
 import './middleware';

react/features/toolbox/components/AudioRouteButton.js

@@ -0,0 +1,160 @@
+// @flow
+
+import React, { Component } from 'react';
+import {
+    findNodeHandle,
+    requireNativeComponent,
+    NativeModules,
+    View
+} from 'react-native';
+import { connect } from 'react-redux';
+
+import { openDialog } from '../../base/dialog';
+import { AudioRoutePickerDialog } from '../../mobile/audio-mode';
+
+import ToolbarButton from './ToolbarButton';
+
+/**
+ * Define the {@code MPVolumeView} React component. It will only be available
+ * on iOS.
+ */
+let MPVolumeView;
+
+if (NativeModules.MPVolumeViewManager) {
+    MPVolumeView = requireNativeComponent('MPVolumeView', null);
+}
+
+/**
+ * Style required to hide the {@code MPVolumeView} view, since it's displayed
+ * programmatically.
+ */
+const HIDE_VIEW_STYLE = { display: 'none' };
+
+type Props = {
+
+    /**
+     * Used to show the {@code AudioRoutePickerDialog}.
+     */
+    dispatch: Function,
+
+    /**
+     * The name of the Icon of this {@code AudioRouteButton}.
+     */
+    iconName: string,
+
+    /**
+     * The style of the Icon of this {@code AudioRouteButton}.
+     */
+    iconStyle: Object,
+
+    /**
+     * {@code AudioRouteButton} styles.
+     */
+    style: Array<*> | Object,
+
+    /**
+     * The color underlying the button.
+     */
+    underlayColor: string
+};
+
+/**
+ * A toolbar button which triggers an audio route picker when pressed.
+ */
+class AudioRouteButton extends Component<Props> {
+    _volumeComponent: ?Object;
+
+    /**
+     * Indicates if there is support for audio device selection via this button.
+     *
+     * @returns {boolean} - True if audio device selection is supported, false
+     * otherwise.
+     */
+    static supported() {
+        return Boolean(MPVolumeView || AudioRoutePickerDialog);
+    }
+
+    /**
+     * Initializes a new {@code AudioRouteButton} instance.
+     *
+     * @param {Object} props - The React {@code Component} props to initialize
+     * the new {@code AudioRouteButton} instance with.
+     */
+    constructor(props) {
+        super(props);
+
+        /**
+         * The internal reference to the React {@code MPVolumeView} for
+         * showing the volume control view.
+         *
+         * @private
+         * @type {ReactComponent}
+         */
+        this._volumeComponent = null;
+
+        // Bind event handlers so they are only bound once per instance.
+        this._onClick = this._onClick.bind(this);
+        this._setVolumeComponent = this._setVolumeComponent.bind(this);
+    }
+
+    _onClick: () => void;
+
+    /**
+     * Handles clicking/pressing this {@code AudioRouteButton} by showing an
+     * audio route picker.
+     *
+     * @private
+     * @returns {void}
+     */
+    _onClick() {
+        if (MPVolumeView) {
+            const handle = findNodeHandle(this._volumeComponent);
+
+            NativeModules.MPVolumeViewManager.show(handle);
+        } else if (AudioRoutePickerDialog) {
+            this.props.dispatch(openDialog(AudioRoutePickerDialog));
+        }
+    }
+
+    _setVolumeComponent: (?Object) => void;
+
+    /**
+     * Sets the internal reference to the React Component wrapping the
+     * {@code MPVolumeView} component.
+     *
+     * @param {ReactComponent} component - React Component.
+     * @returns {void}
+     */
+    _setVolumeComponent(component) {
+        this._volumeComponent = component;
+    }
+
+    /**
+     * Implements React's {@link Component#render()}.
+     *
+     * @inheritdoc
+     * @returns {ReactElement}
+     */
+    render() {
+        const { iconName, iconStyle, style, underlayColor } = this.props;
+
+        return (
+            <View>
+                <ToolbarButton
+                    iconName = { iconName }
+                    iconStyle = { iconStyle }
+                    onClick = { this._onClick }
+                    style = { style }
+                    underlayColor = { underlayColor } />
+                {
+                    MPVolumeView
+                        && <MPVolumeView
+                            ref = { this._setVolumeComponent }
+                            style = { HIDE_VIEW_STYLE } />
+                }
+            </View>
+        );
+    }
+}
+
+export default connect()(AudioRouteButton);

react/features/toolbox/components/Toolbox.native.js

@@ -25,6 +25,8 @@ import {
     abstractMapDispatchToProps,
     abstractMapStateToProps
 } from '../functions';
+
+import AudioRouteButton from './AudioRouteButton';
 import styles from './styles';
 import ToolbarButton from './ToolbarButton';
 
@@ -310,6 +312,14 @@ class Toolbox extends Component {
                             style = { style }
                             underlayColor = { underlayColor } />
                 }
+                {
+                    AudioRouteButton.supported()
+                        && <AudioRouteButton
+                            iconName = { 'volume' }
+                            iconStyle = { iconStyle }
+                            style = { style }
+                            underlayColor = { underlayColor } />
+                }
             </View>
         );