some fixings

app/src/main/AndroidManifest.xml

@@ -3,7 +3,12 @@
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SYSTEM_EXEMPTED"/>
+    <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
+    <uses-permission android:name="android.permission.USE_EXACT_ALARM"/>
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
 
     <application
         android:name=".CatFlipScreenApplication"
@@ -28,11 +33,14 @@
         <service
             android:name=".FlipScreenService"
             android:enabled="true"
-            android:exported="true" />
+            android:foregroundServiceType="systemExempted"
+            android:stopWithTask="false"
+            android:exported="false" />
 
         <activity
             android:name=".MainActivity"
             android:exported="true"
+
             android:theme="@style/Theme.AppCompat">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/net/mezimmah/catflipscreen/FlipScreenService.kt

@@ -1,5 +1,6 @@
 package net.mezimmah.catflipscreen
 
+import android.app.AlarmManager
 import android.app.Notification
 import android.app.NotificationChannel
 import android.app.NotificationManager
@@ -9,8 +10,8 @@ import android.content.Context
 import android.content.Intent
 import android.media.MediaRouter
 import android.os.IBinder
+import android.os.SystemClock
 import android.util.Log
-import androidx.core.app.NotificationCompat
 
 
 class FlipScreenService : Service() {
@@ -20,34 +21,21 @@ class FlipScreenService : Service() {
     }
 
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
-        showNotification(intent)
+        showNotification()
         showPresentationScreen()
 
         return super.onStartCommand(intent, flags, startId)
     }
 
-    private fun showNotification(intent: Intent?) {
+    override fun onTaskRemoved(rootIntent: Intent?) {
-        val input: String? = intent?.getStringExtra("inputExtra")
+        val restartServiceIntent = Intent(applicationContext, FlipScreenService::class.java).also {
-        val notificationIntent = Intent(this, MainActivity::class.java)
+            it.setPackage(packageName)
-        val pendingIntent = PendingIntent.getActivity(
+        };
-            this,
+        val restartServicePendingIntent: PendingIntent = PendingIntent.getService(this, 1, restartServiceIntent,
-            0, notificationIntent, PendingIntent.FLAG_IMMUTABLE
+            PendingIntent.FLAG_ONE_SHOT or PendingIntent.FLAG_IMMUTABLE);
-        )
+        applicationContext.getSystemService(Context.ALARM_SERVICE);
-        val notification: Notification = NotificationCompat.Builder(this, CatFlipScreenApplication.CHANNEL_ID)
+        val alarmService: AlarmManager = applicationContext.getSystemService(Context.ALARM_SERVICE) as AlarmManager;
-            .setContentTitle("Auto Start Service")
+        alarmService.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() + 1000, restartServicePendingIntent);
-            .setContentText(input)
-            .setSmallIcon(android.R.drawable.ic_dialog_info)
-            .setContentIntent(pendingIntent)
-            .build()
-        val mNotificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
-        val channel = NotificationChannel(
-            CatFlipScreenApplication.CHANNEL_ID,
-            CatFlipScreenApplication.CHANNEL_NAME,
-            NotificationManager.IMPORTANCE_DEFAULT
-        )
-        mNotificationManager.createNotificationChannel(channel)
-        NotificationCompat.Builder(this, CatFlipScreenApplication.CHANNEL_ID)
-        startForeground(1, notification)
     }
 
     private fun showPresentationScreen() {
@@ -69,4 +57,32 @@ class FlipScreenService : Service() {
             )
         }
     }
+
+    private fun showNotification() {
+        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+        val channel = NotificationChannel(
+            CatFlipScreenApplication.CHANNEL_ID,
+            CatFlipScreenApplication.CHANNEL_NAME,
+            NotificationManager.IMPORTANCE_HIGH
+        )
+        channel.description = "Cat Flip Screen Service"
+        channel.enableLights(true)
+        channel.enableVibration(true)
+        notificationManager.createNotificationChannel(channel)
+
+        val pendingIntent: PendingIntent = Intent(this, MainActivity::class.java).let { notificationIntent ->
+            PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_IMMUTABLE)
+        }
+        val builder: Notification.Builder = Notification.Builder(
+            this,
+            CatFlipScreenApplication.CHANNEL_ID
+        )
+        val notification = builder
+            .setContentTitle("Cat Flip Screen")
+            .setContentText("For making the external display work.")
+            .setContentIntent(pendingIntent)
+            .setSmallIcon(R.mipmap.ic_launcher)
+            .build()
+        startForeground(1, notification)
+    }
 }

app/src/main/java/net/mezimmah/catflipscreen/MyReceiver.kt

@@ -9,7 +9,7 @@ import android.util.Log
 class MyReceiver : BroadcastReceiver() {
 
     override fun onReceive(context: Context, intent: Intent) {
-        context.startForegroundService(Intent(context, FlipScreenService::class.java))
+        context.startService(Intent(context, FlipScreenService::class.java))
         Log.i("Autostart", "started")
     }
 }