From b942e4a88b9034260f62ac63d882017102a26841 Mon Sep 17 00:00:00 2001
From: Akos Putz <akos@purewatercraft.com>
Date: Thu, 8 Jul 2021 17:03:05 -0400
Subject: [PATCH] Saving notification configuration to shared preferences,
 preventing the notification from resetting to the default text after an app
 auto-restart

---
 .../FlutterBackgroundPlugin.kt                | 45 ++++++++++++++++---
 .../IsolateHolderService.kt                   |  1 +
 2 files changed, 40 insertions(+), 6 deletions(-)

diff --git a/android/src/main/kotlin/de/julianassmann/flutter_background/FlutterBackgroundPlugin.kt b/android/src/main/kotlin/de/julianassmann/flutter_background/FlutterBackgroundPlugin.kt
index 73805cd..5ca05d2 100644
--- a/android/src/main/kotlin/de/julianassmann/flutter_background/FlutterBackgroundPlugin.kt
+++ b/android/src/main/kotlin/de/julianassmann/flutter_background/FlutterBackgroundPlugin.kt
@@ -35,16 +35,47 @@ class FlutterBackgroundPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
     @JvmStatic
     var notificationTitle: String? = "flutter_background foreground service"
     @JvmStatic
+    val NOTIFICATION_TITLE_KEY = "android.notificationTitle"
+    @JvmStatic
     var notificationText: String? = "Keeps the flutter app running in the background"
     @JvmStatic
+    val NOTIFICATION_TEXT_KEY = "android.notificationText"
+    @JvmStatic
     var notificationImportance: Int? = NotificationCompat.PRIORITY_DEFAULT
-
+    @JvmStatic
+    val NOTIFICATION_IMPORTANCE_KEY = "android.notificationImportance"
     @JvmStatic
     var notificationIconName: String? = "ic_launcher"
     @JvmStatic
+    val NOTIFICATION_ICON_NAME_KEY = "android.notificationIconName"
+    @JvmStatic
     var notificationIconDefType: String? = "mipmap"
+    @JvmStatic
+    val NOTIFICATION_ICON_DEF_TYPE_KEY = "android.notificationIconDefType"
+
+    fun loadNotificationConfiguration(context: Context?) {
+      var sharedPref = context?.getSharedPreferences(context?.packageName + "_preferences", Context.MODE_PRIVATE)
+      notificationTitle = sharedPref?.getString(NOTIFICATION_TITLE_KEY, notificationTitle)
+      notificationText = sharedPref?.getString(NOTIFICATION_TEXT_KEY, notificationText)
+      notificationImportance = sharedPref?.getInt(NOTIFICATION_IMPORTANCE_KEY, notificationImportance!!)
+      notificationIconName = sharedPref?.getString(NOTIFICATION_ICON_NAME_KEY, notificationIconName)
+      notificationIconDefType = sharedPref?.getString(NOTIFICATION_ICON_DEF_TYPE_KEY, notificationIconDefType)
+    }
+
+    fun saveNotificationConfiguration(context: Context?) {
+      var sharedPref = context?.getSharedPreferences(context?.packageName + "_preferences", Context.MODE_PRIVATE)
+      with (sharedPref?.edit()) {
+        this?.putString(NOTIFICATION_TITLE_KEY, notificationTitle)
+        this?.putString(NOTIFICATION_TEXT_KEY, notificationText)
+        this?.putInt(NOTIFICATION_IMPORTANCE_KEY, notificationImportance!!)
+        this?.putString(NOTIFICATION_ICON_NAME_KEY, notificationIconName)
+        this?.putString(NOTIFICATION_ICON_DEF_TYPE_KEY, notificationIconDefType)
+        this?.apply()
+      }
+    }
   }
 
+
   private fun isValidResource(context: Context, name: String, defType: String, result: Result, errorCode: String): Boolean {
     val resourceId = context.getResources().getIdentifier(name, defType, context.getPackageName())
     if (resourceId == 0) {
@@ -69,11 +100,11 @@ class FlutterBackgroundPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
         result.success(hasPermissions)
       }
       "initialize" -> {
-        val title = call.argument<String>("android.notificationTitle")
-        val text = call.argument<String>("android.notificationText")
-        val importance = call.argument<Int>("android.notificationImportance")
-        val iconName = call.argument<String>("android.notificationIconName")
-        val iconDefType = call.argument<String>("android.notificationIconDefType")
+        val title = call.argument<String>(NOTIFICATION_TITLE_KEY)
+        val text = call.argument<String>(NOTIFICATION_TEXT_KEY)
+        val importance = call.argument<Int>(NOTIFICATION_IMPORTANCE_KEY)
+        val iconName = call.argument<String>(NOTIFICATION_ICON_NAME_KEY)
+        val iconDefType = call.argument<String>(NOTIFICATION_ICON_DEF_TYPE_KEY)
 
         // Set static values so the IsolateHolderService can use them later on to configure the notification
         notificationImportance = importance ?: notificationImportance
@@ -82,6 +113,8 @@ class FlutterBackgroundPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
         notificationIconName = iconName ?: notificationIconName
         notificationIconDefType = iconDefType ?: notificationIconDefType
 
+        saveNotificationConfiguration(context)
+
         if (permissionHandler!!.isWakeLockPermissionGranted() && permissionHandler!!.isIgnoringBatteryOptimizations()) {
           result.success(true)
           return
diff --git a/android/src/main/kotlin/de/julianassmann/flutter_background/IsolateHolderService.kt b/android/src/main/kotlin/de/julianassmann/flutter_background/IsolateHolderService.kt
index 1e5758a..9f456c8 100644
--- a/android/src/main/kotlin/de/julianassmann/flutter_background/IsolateHolderService.kt
+++ b/android/src/main/kotlin/de/julianassmann/flutter_background/IsolateHolderService.kt
@@ -42,6 +42,7 @@ class IsolateHolderService : Service() {
 
     @SuppressLint("WakelockTimeout")
     override fun onCreate() {
+        FlutterBackgroundPlugin.loadNotificationConfiguration(applicationContext)
 
         val pm = getApplicationContext().getPackageManager()
         val notificationIntent  =