Try routing audio to external device

Author: jmartinesp

features/call/impl/build.gradle.kts

@@ -75,6 +75,7 @@ dependencies {
     implementation(projects.appconfig)
     implementation(projects.features.enterprise.api)
     implementation(projects.libraries.architecture)
+    implementation(projects.libraries.androidutils)
     implementation(projects.libraries.core)
     implementation(projects.libraries.designsystem)
     implementation(projects.libraries.featureflag.api)

features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/CallScreenView.kt

@@ -37,6 +37,8 @@ import io.element.android.features.call.impl.pip.PictureInPictureStateProvider
 import io.element.android.features.call.impl.pip.aPictureInPictureState
 import io.element.android.features.call.impl.utils.WebViewPipController
 import io.element.android.features.call.impl.utils.WebViewWidgetMessageInterceptor
+import io.element.android.libraries.androidutils.compat.disableExternalAudioDevice
+import io.element.android.libraries.androidutils.compat.enableExternalAudioDevice
 import io.element.android.libraries.architecture.AsyncData
 import io.element.android.libraries.designsystem.components.ProgressDialog
 import io.element.android.libraries.designsystem.components.button.BackButton
@@ -155,6 +157,8 @@ private fun CallWebView(
                 // Set 'voice call' mode so volume keys actually control the call volume
                 val audioManager = context.getSystemService<AudioManager>()
                 audioManager?.mode = AudioManager.MODE_IN_COMMUNICATION
+
+                audioManager?.enableExternalAudioDevice()
 
                 WebView(context).apply {
                     onWebViewCreate(this)
@@ -169,6 +173,7 @@ private fun CallWebView(
             onRelease = { webView ->
                 // Reset audio mode
                 val audioManager = webView.context.getSystemService<AudioManager>()
+                audioManager?.disableExternalAudioDevice()
                 audioManager?.mode = AudioManager.MODE_NORMAL
 
                 webView.destroy()

libraries/androidutils/src/main/kotlin/io/element/android/libraries/androidutils/compat/AudioManager.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.androidutils.compat
+
+import android.media.AudioDeviceInfo
+import android.media.AudioManager
+import android.os.Build
+
+fun AudioManager.enableExternalAudioDevice() {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+        // The list of device types that are considered as communication devices, sorted by likelihood of it being used for communication.
+        val wantedDeviceTypes = listOf(
+            // Paired bluetooth device with microphone
+            AudioDeviceInfo.TYPE_BLUETOOTH_SCO,
+            // USB devices which can play or record audio
+            AudioDeviceInfo.TYPE_USB_HEADSET,
+            AudioDeviceInfo.TYPE_USB_DEVICE,
+            AudioDeviceInfo.TYPE_USB_ACCESSORY,
+            // Wired audio devices
+            AudioDeviceInfo.TYPE_WIRED_HEADSET,
+            AudioDeviceInfo.TYPE_WIRED_HEADPHONES,
+            // The built-in earpiece of the device
+            AudioDeviceInfo.TYPE_BUILTIN_EARPIECE,
+            // The built-in speaker of the device
+            AudioDeviceInfo.TYPE_BUILTIN_SPEAKER,
+        )
+        val devices = availableCommunicationDevices
+        val selectedDevice = devices.find {
+            wantedDeviceTypes.contains(it.type)
+        }
+        selectedDevice?.let { setCommunicationDevice(it) }
+    } else {
+        isSpeakerphoneOn = true
+    }
+}
+
+fun AudioManager.disableExternalAudioDevice() {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+        clearCommunicationDevice()
+    } else {
+        isSpeakerphoneOn = false
+    }
+}