[Bugfix] Fix microphone loss during background voice calls on Android 14

library/ui-strings/src/main/res/values/strings.xml

@@ -652,6 +652,8 @@
 
     <string name="call_remove_jitsi_widget_progress">Ending call…</string>
 
+    <string name="microphone_in_use_title">Microphone in use</string>
+
     <!-- permissions Android M -->
     <string name="permissions_rationale_popup_title">Information</string>
     <!-- Note to translators: the translation MUST contain the string "${app_name}", which will be replaced by the application name -->

vector/src/main/AndroidManifest.xml

@@ -56,6 +56,9 @@
     <!-- Jitsi SDK is now API23+ -->
     <uses-sdk tools:overrideLibrary="com.swmansion.gesturehandler,org.jitsi.meet.sdk,com.oney.WebRTCModule,com.learnium.RNDeviceInfo,com.reactnativecommunity.asyncstorage,com.ocetnik.timer,com.calendarevents,com.reactnativecommunity.netinfo,com.kevinresol.react_native_default_preference,com.rnimmersive,com.rnimmersivemode,com.corbt.keepawake,com.BV.LinearGradient,com.horcrux.svg,com.oblador.performance,com.reactnativecommunity.slider,com.brentvatne.react,com.reactnativecommunity.clipboard,com.swmansion.gesturehandler.react,org.linusu,org.reactnative.maskedview,com.reactnativepagerview,com.swmansion.reanimated,com.th3rdwave.safeareacontext,com.swmansion.rnscreens,org.devio.rn.splashscreen,com.reactnativecommunity.webview,org.wonday.orientation" />
 
+    <!-- For MicrophoneAccessService -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MICROPHONE" />
+
     <!-- Adding CAMERA permission prevents Chromebooks to see the application on the PlayStore -->
     <!-- Tell that the Camera is not mandatory to install the application -->
     <uses-feature
@@ -395,6 +398,13 @@
             android:foregroundServiceType="mediaProjection"
             tools:targetApi="Q" />
 
+        <service
+            android:name=".features.call.audio.MicrophoneAccessService"
+            android:exported="false"
+            android:foregroundServiceType="microphone"
+            android:permission="android.permission.FOREGROUND_SERVICE_MICROPHONE">
+        </service>
+
         <!-- Receivers -->
 
         <receiver

vector/src/main/java/im/vector/app/core/services/CallAndroidService.kt

@@ -31,6 +31,7 @@ import im.vector.app.core.extensions.singletonEntryPoint
 import im.vector.app.core.extensions.startForegroundCompat
 import im.vector.app.features.call.CallArgs
 import im.vector.app.features.call.VectorCallActivity
+import im.vector.app.features.call.audio.MicrophoneAccessService
 import im.vector.app.features.call.telecom.CallConnection
 import im.vector.app.features.call.webrtc.WebRtcCall
 import im.vector.app.features.call.webrtc.WebRtcCallManager
@@ -208,6 +209,9 @@ class CallAndroidService : VectorAndroidService() {
             stopForegroundCompat()
             mediaSession?.isActive = false
             myStopSelf()
+
+            // Also stop the microphone service if it is running
+            stopService(Intent(this, MicrophoneAccessService::class.java))
         }
         val wasConnected = connectedCallIds.remove(callId)
         if (!wasConnected && !terminatedCall.isOutgoing && !rejected && endCallReason != EndCallReason.ANSWERED_ELSEWHERE) {

vector/src/main/java/im/vector/app/features/call/VectorCallActivity.kt

@@ -16,12 +16,14 @@
 
 package im.vector.app.features.call
 
+import android.Manifest
 import android.app.Activity
 import android.app.KeyguardManager
 import android.app.PictureInPictureParams
 import android.content.Context
 import android.content.Intent
 import android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP
+import android.content.pm.PackageManager
 import android.graphics.Color
 import android.media.projection.MediaProjection
 import android.media.projection.MediaProjectionManager
@@ -40,6 +42,8 @@ import androidx.core.content.getSystemService
 import androidx.core.util.Consumer
 import androidx.core.view.isInvisible
 import androidx.core.view.isVisible
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.ProcessLifecycleOwner
 import com.airbnb.mvrx.Fail
 import com.airbnb.mvrx.Mavericks
 import com.airbnb.mvrx.viewModel
@@ -57,6 +61,7 @@ import im.vector.app.core.utils.PERMISSIONS_FOR_VIDEO_IP_CALL
 import im.vector.app.core.utils.checkPermissions
 import im.vector.app.core.utils.registerForPermissionsResult
 import im.vector.app.databinding.ActivityCallBinding
+import im.vector.app.features.call.audio.MicrophoneAccessService
 import im.vector.app.features.call.dialpad.CallDialPadBottomSheet
 import im.vector.app.features.call.dialpad.DialPadFragment
 import im.vector.app.features.call.transfer.CallTransferActivity
@@ -245,6 +250,43 @@ class VectorCallActivity :
         }
     }
 
+    private fun startMicrophoneService() {
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO)
+                == PackageManager.PERMISSION_GRANTED) {
+
+            // Only start the service if the app is in the foreground
+            if (isAppInForeground()) {
+                Timber.tag(loggerTag.value).v("Starting microphone foreground service")
+                val intent = Intent(this, MicrophoneAccessService::class.java)
+                ContextCompat.startForegroundService(this, intent)
+            } else {
+                Timber.tag(loggerTag.value).v("App is not in foreground; cannot start microphone service")
+            }
+        } else {
+            Timber.tag(loggerTag.value).v("Microphone permission not granted; cannot start service")
+        }
+    }
+
+    private fun isAppInForeground(): Boolean {
+        val appProcess = ProcessLifecycleOwner.get().lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED)
+        return appProcess
+    }
+    private fun stopMicrophoneService() {
+        Timber.tag(loggerTag.value).d("Stopping MicrophoneAccessService (if needed).")
+        val intent = Intent(this, MicrophoneAccessService::class.java)
+        stopService(intent)
+    }
+
+    override fun onPause() {
+        super.onPause()
+        startMicrophoneService()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        stopMicrophoneService()
+    }
+
     override fun onDestroy() {
         detachRenderersIfNeeded()
         turnScreenOffAndKeyguardOn()

vector/src/main/java/im/vector/app/features/call/audio/MicrophoneAccessService.kt

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2024 New Vector 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.
+ */
+
+package im.vector.app.features.call.audio
+
+import android.content.Intent
+import android.os.Binder
+import android.os.IBinder
+import dagger.hilt.android.AndroidEntryPoint
+import im.vector.app.core.extensions.startForegroundCompat
+import im.vector.app.core.services.VectorAndroidService
+import im.vector.app.features.notifications.NotificationUtils
+import javax.inject.Inject
+
+@AndroidEntryPoint
+class MicrophoneAccessService : VectorAndroidService() {
+
+    @Inject lateinit var notificationUtils: NotificationUtils
+    private val binder = LocalBinder()
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        showMicrophoneAccessNotification()
+
+        return START_STICKY
+    }
+
+    private fun showMicrophoneAccessNotification() {
+        val notificationId = System.currentTimeMillis().toInt()
+        val notification = notificationUtils.buildMicrophoneAccessNotification()
+        startForegroundCompat(notificationId, notification)
+    }
+
+    override fun onBind(intent: Intent?): IBinder {
+        return binder
+    }
+
+    inner class LocalBinder : Binder() {
+        fun getService(): MicrophoneAccessService = this@MicrophoneAccessService
+    }
+}

vector/src/main/java/im/vector/app/features/notifications/NotificationUtils.kt

@@ -538,6 +538,19 @@ class NotificationUtils @Inject constructor(
                 .build()
     }
 
+    /**
+     * Creates a notification indicating that the microphone is currently being accessed by the application.
+     */
+    fun buildMicrophoneAccessNotification(): Notification {
+        return NotificationCompat.Builder(context, SILENT_NOTIFICATION_CHANNEL_ID)
+                .setContentTitle(stringProvider.getString(CommonStrings.microphone_in_use_title))
+                .setSmallIcon(R.drawable.ic_call_answer)
+                .setPriority(NotificationCompat.PRIORITY_LOW)
+                .setColor(ThemeUtils.getColor(context, android.R.attr.colorPrimary))
+                .setCategory(NotificationCompat.CATEGORY_CALL)
+                .build()
+    }
+
     /**
      * Creates a notification that indicates the application is initializing.
      */