demo: display foreground notification while syncing

demo/android/src/main/AndroidManifest.xml

@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
+
     <application
         android:name=".MainApplication"
         android:allowBackup="true"
@@ -22,7 +25,8 @@
         </activity>
         <service
             android:name=".service.SyncService"
-            android:exported="false" />
+            android:exported="false"
+            android:foregroundServiceType="dataSync" />
     </application>
 
 </manifest>

demo/android/src/main/kotlin/im/molly/monero/demo/service/SyncService.kt

@@ -1,10 +1,15 @@
 package im.molly.monero.demo.service
 
+import android.app.NotificationChannel
+import android.app.NotificationManager
 import android.content.Context
 import android.content.Intent
+import android.content.pm.ServiceInfo
 import android.os.Binder
+import android.os.Build
 import android.os.IBinder
 import android.util.Log
+import androidx.core.app.NotificationCompat
 import androidx.lifecycle.LifecycleService
 import androidx.lifecycle.lifecycleScope
 import im.molly.monero.demo.AppModule
@@ -16,6 +21,8 @@ import kotlin.time.Duration.Companion.seconds
 
 const val TAG = "SyncService"
 
+const val NOTIFICATION_CHANNEL_ID = "SyncService"
+
 class SyncService(
     private val walletRepository: WalletRepository = AppModule.walletRepository,
     private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO,
@@ -82,6 +89,8 @@ class SyncService(
         Log.d(TAG, "onCreate")
         super.onCreate()
 
+        startForeground()
+
         lifecycleScope.launch(ioDispatcher) {
             doSync()
         }
@@ -95,7 +104,31 @@ class SyncService(
     companion object {
         fun start(context: Context) {
             val intent = Intent(context, SyncService::class.java)
-            context.startService(intent)
+            context.startForegroundService(intent)
         }
     }
+
+    private fun startForeground() {
+        ensureNotificationChannel()
+
+        val notification = NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
+            .build()
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            startForeground(100, notification, ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC)
+        } else {
+            startForeground(100, notification)
+        }
+    }
+
+    private fun ensureNotificationChannel() {
+        val notificationManager = getSystemService(NotificationManager::class.java)!!
+
+        notificationManager.createNotificationChannel(
+            NotificationChannel(
+                NOTIFICATION_CHANNEL_ID,
+                "Wallet Foreground Service",
+                NotificationManager.IMPORTANCE_LOW,
+            )
+        )
+    }
 }

demo/android/src/main/kotlin/im/molly/monero/demo/ui/AddWalletWizard.kt

@@ -261,7 +261,7 @@ private fun SecondStepScreen(
             AlertDialog(onDismissRequest = { showOffLineConfirmationDialog = false }, title = {
                 Text("No remote nodes selected")
             }, text = {
-                Text("There are no remote nodes added to your wallet settings. Are you sure you want to start an offline wallet?")
+                Text("There are no remote nodes added to your wallet settings. Are you sure you want to create an offline wallet?")
             }, confirmButton = {
                 TextButton(onClick = {
                     showOffLineConfirmationDialog = false