new: custom foreground service on Android (#556)

android/app/build.gradle

@@ -53,7 +53,6 @@ android {
     }
 
     defaultConfig {
-        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "tech.lolli.toolbox"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.

android/app/src/main/AndroidManifest.xml

@@ -1,4 +1,5 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+<manifest xmlns:tools="http://schemas.android.com/tools"
+    xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
@@ -15,7 +16,8 @@
         android:icon="@mipmap/ic_launcher"
         android:allowBackup="true"
         android:hasFragileUserData="true"
-        android:restoreAnyVersion="true">
+        android:restoreAnyVersion="true"
+        tools:targetApi="q">
         <activity
             android:name=".MainActivity"
             android:exported="true"
@@ -43,11 +45,6 @@
             android:name="flutterEmbedding"
             android:value="2" />
 
-        <service
-            android:name="id.flutter.flutter_background_service.BackgroundService"
-            android:foregroundServiceType="dataSync"
-        />
-
         <receiver
             android:name=".widget.HomeWidget"
             android:exported="false"
@@ -68,8 +65,9 @@
         </receiver>
 
         <service
-            android:name=".MyForegroundService"
+            android:name=".ForegroundService"
             android:enabled="true"
+            android:foregroundServiceType="dataSync"
             android:exported="false" />
 
     </application>

android/app/src/main/kotlin/tech/lolli/toolbox/ForegroundService.kt

@@ -4,11 +4,9 @@ import android.app.*
 import android.content.Intent
 import android.os.Build
 import android.os.IBinder
-import androidx.core.app.NotificationCompat
 
-class MyForegroundService : Service() {
-
-    private val CHANNEL_ID = "ForegroundServiceChannel"
+class ForegroundService : Service() {
+    private val chanId = "ForegroundServiceChannel"
 
     override fun onCreate() {
         super.onCreate()
@@ -31,8 +29,8 @@ class MyForegroundService : Service() {
     private fun createNotificationChannel() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             val serviceChannel = NotificationChannel(
-                CHANNEL_ID,
-                CHANNEL_ID,
+                chanId,
+                chanId,
                 NotificationManager.IMPORTANCE_DEFAULT
             )
             val manager = getSystemService(NotificationManager::class.java)
@@ -49,11 +47,20 @@ class MyForegroundService : Service() {
             PendingIntent.FLAG_IMMUTABLE
         )
 
-        return NotificationCompat.Builder(this, CHANNEL_ID)
-            .setContentTitle("App is running")
-            .setContentText("Click to open the app")
-            .setSmallIcon(R.drawable.ic_notification)
-            .setContentIntent(pendingIntent)
-            .build()
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            Notification.Builder(this, chanId)
+                .setContentTitle("App is running")
+                .setContentText("Click to open the app")
+                .setSmallIcon(R.mipmap.ic_launcher)
+                .setContentIntent(pendingIntent)
+                .build()
+        } else {
+            Notification.Builder(this)
+                .setContentTitle("App is running")
+                .setContentText("Click to open the app")
+                .setSmallIcon(R.mipmap.ic_launcher)
+                .setContentIntent(pendingIntent)
+                .build()
+        }
     }
 }

android/app/src/main/kotlin/tech/lolli/toolbox/MainActivity.kt

@@ -1,6 +1,11 @@
 package tech.lolli.toolbox
 
 import android.content.Intent
+import android.content.pm.PackageManager
+import android.os.Build
+import android.Manifest
+import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
 import io.flutter.embedding.android.FlutterFragmentActivity
 import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.MethodChannel
@@ -18,7 +23,8 @@ class MainActivity: FlutterFragmentActivity() {
                         result.success(null)
                     }
                     "startService" -> {
-                        val serviceIntent = Intent(this, ForegroundService::class.java)
+                        reqPerm()
+                        val serviceIntent = Intent(this@MainActivity, ForegroundService::class.java)
                         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                             startForegroundService(serviceIntent)
                         } else {
@@ -32,4 +38,16 @@ class MainActivity: FlutterFragmentActivity() {
             }
         }
     }
+
+    private fun reqPerm() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.TIRAMISU) return
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS)
+            != PackageManager.PERMISSION_GRANTED) {
+            ActivityCompat.requestPermissions(
+                this,
+                arrayOf(Manifest.permission.POST_NOTIFICATIONS),
+                123,
+            )
+        }
+    }
 }