From fa3476d6cdbf810e5ebf1413e1ae859579a75562 Mon Sep 17 00:00:00 2001
From: Onuray Sahin <onurays@element.io>
Date: Wed, 20 Apr 2022 13:33:35 +0300
Subject: [PATCH] Create a foreground service during screen sharing.

---
 vector/src/main/AndroidManifest.xml           |  6 +++
 .../app/features/call/VectorCallActivity.kt   |  8 +++
 .../call/webrtc/ScreenCaptureService.kt       | 53 +++++++++++++++++++
 .../notifications/NotificationUtils.kt        | 14 +++++
 vector/src/main/res/values/strings.xml        |  4 ++
 5 files changed, 85 insertions(+)
 create mode 100644 vector/src/main/java/im/vector/app/features/call/webrtc/ScreenCaptureService.kt

diff --git a/vector/src/main/AndroidManifest.xml b/vector/src/main/AndroidManifest.xml
index eada664216..20b7c4908a 100644
--- a/vector/src/main/AndroidManifest.xml
+++ b/vector/src/main/AndroidManifest.xml
@@ -375,6 +375,12 @@
             android:exported="false"
             android:foregroundServiceType="location" />
 
+        <service
+            android:name=".features.call.webrtc.ScreenCaptureService"
+            android:exported="false"
+            android:foregroundServiceType="mediaProjection"
+            tools:targetApi="Q" />
+
         <!-- Receivers -->
 
         <receiver
diff --git a/vector/src/main/java/im/vector/app/features/call/VectorCallActivity.kt b/vector/src/main/java/im/vector/app/features/call/VectorCallActivity.kt
index 7bbb47a7fb..0a9c2da873 100644
--- a/vector/src/main/java/im/vector/app/features/call/VectorCallActivity.kt
+++ b/vector/src/main/java/im/vector/app/features/call/VectorCallActivity.kt
@@ -57,6 +57,7 @@ import im.vector.app.features.call.dialpad.CallDialPadBottomSheet
 import im.vector.app.features.call.dialpad.DialPadFragment
 import im.vector.app.features.call.transfer.CallTransferActivity
 import im.vector.app.features.call.utils.EglUtils
+import im.vector.app.features.call.webrtc.ScreenCaptureService
 import im.vector.app.features.call.webrtc.WebRtcCall
 import im.vector.app.features.call.webrtc.WebRtcCallManager
 import im.vector.app.features.displayname.getBestName
@@ -633,6 +634,13 @@ class VectorCallActivity : VectorBaseActivity<ActivityCallBinding>(), CallContro
     private val screenSharingPermissionActivityResultLauncher = registerStartForActivityResult { activityResult ->
         if (activityResult.resultCode == Activity.RESULT_OK) {
             callViewModel.handle(VectorCallViewActions.StartScreenSharing)
+            // We need to start a foreground service with a sticky notification during screen sharing
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                ContextCompat.startForegroundService(
+                        this,
+                        Intent(this, ScreenCaptureService::class.java)
+                )
+            }
         }
     }
 
diff --git a/vector/src/main/java/im/vector/app/features/call/webrtc/ScreenCaptureService.kt b/vector/src/main/java/im/vector/app/features/call/webrtc/ScreenCaptureService.kt
new file mode 100644
index 0000000000..7626e8178c
--- /dev/null
+++ b/vector/src/main/java/im/vector/app/features/call/webrtc/ScreenCaptureService.kt
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2022 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.webrtc
+
+import android.content.Intent
+import android.os.Binder
+import android.os.IBinder
+import dagger.hilt.android.AndroidEntryPoint
+import im.vector.app.core.services.VectorService
+import im.vector.app.features.notifications.NotificationUtils
+import javax.inject.Inject
+
+@AndroidEntryPoint
+class ScreenCaptureService : VectorService() {
+
+    @Inject lateinit var notificationUtils: NotificationUtils
+    private val binder = LocalBinder()
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        // Show a sticky notification
+        val notificationId = System.currentTimeMillis().toInt()
+        val notification = notificationUtils.buildScreenSharingNotification()
+        startForeground(notificationId, notification)
+
+        return START_STICKY
+    }
+
+    override fun onBind(intent: Intent?): IBinder {
+        return binder
+    }
+
+    fun stopService() {
+        stopSelf()
+    }
+
+    inner class LocalBinder : Binder() {
+        fun getService(): ScreenCaptureService = this@ScreenCaptureService
+    }
+}
diff --git a/vector/src/main/java/im/vector/app/features/notifications/NotificationUtils.kt b/vector/src/main/java/im/vector/app/features/notifications/NotificationUtils.kt
index 161b58d53d..e44f42d5cd 100755
--- a/vector/src/main/java/im/vector/app/features/notifications/NotificationUtils.kt
+++ b/vector/src/main/java/im/vector/app/features/notifications/NotificationUtils.kt
@@ -535,6 +535,20 @@ class NotificationUtils @Inject constructor(private val context: Context,
                 .build()
     }
 
+    /**
+     * Creates a notification that indicates the application is capturing the screen.
+     */
+    fun buildScreenSharingNotification(): Notification {
+        return NotificationCompat.Builder(context, SILENT_NOTIFICATION_CHANNEL_ID)
+                .setContentTitle(stringProvider.getString(R.string.screen_sharing_notification_title))
+                .setContentText(stringProvider.getString(R.string.screen_sharing_notification_description))
+                .setSmallIcon(R.drawable.ic_share_screen)
+                .setColor(ThemeUtils.getColor(context, android.R.attr.colorPrimary))
+                .setCategory(NotificationCompat.CATEGORY_SERVICE)
+                .setContentIntent(buildOpenHomePendingIntentForSummary())
+                .build()
+    }
+
     fun buildDownloadFileNotification(uri: Uri, fileName: String, mimeType: String): Notification {
         return NotificationCompat.Builder(context, SILENT_NOTIFICATION_CHANNEL_ID)
                 .setGroup(stringProvider.getString(R.string.app_name))
diff --git a/vector/src/main/res/values/strings.xml b/vector/src/main/res/values/strings.xml
index 42f85832d4..4b8009d10b 100644
--- a/vector/src/main/res/values/strings.xml
+++ b/vector/src/main/res/values/strings.xml
@@ -3024,4 +3024,8 @@
     <string name="room_message_notify_everyone">Notify the whole room</string>
     <string name="room_message_autocomplete_users">Users</string>
     <string name="room_message_autocomplete_notification">Room notification</string>
+
+    <!-- Screen sharing -->
+    <string name="screen_sharing_notification_title">${app_name} Screen Sharing</string>
+    <string name="screen_sharing_notification_description">Screen sharing is in progress</string>
 </resources>