Use system setting to maintain activation status of ntfy

Indeed, since the preference fragment is part of the Settings
app, we cannot use shared preference to share Ntfy activation status.

app/src/main/AndroidManifest.xml

@@ -12,6 +12,8 @@
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="28"/> <!-- Only required on SDK <= 28 -->
     <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM"/> <!-- To reschedule the websocket retry -->
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/> <!-- As of Android 13, we need to ask for permission to post notifications -->
+    <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS"
+        tools:ignore="ProtectedPermissions" />
 
     <!--
         Permission REQUEST_INSTALL_PACKAGES (F-Droid only!):

app/src/main/java/io/heckel/ntfy/service/SubscriberService.kt

@@ -8,6 +8,7 @@ import android.os.Build
 import android.os.IBinder
 import android.os.PowerManager
 import android.os.SystemClock
+import android.provider.Settings
 import androidx.core.app.NotificationCompat
 import androidx.core.content.ContextCompat
 import androidx.preference.PreferenceManager
@@ -94,8 +95,14 @@ class SubscriberService : Service() {
     override fun onDestroy() {
         Log.d(TAG, "Subscriber service has been destroyed")
         stopService()
-        val preferenceKey = getString(R.string.eos_preference_key_is_enabled)
-        if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean(preferenceKey, false)) {
+
+        val isEnabled = Settings.Global.getInt(
+            applicationContext.contentResolver,
+            applicationContext.getString(R.string.eos_preference_key_is_enabled),
+            0
+        )
+
+        if (isEnabled == 1) {
              sendBroadcast(Intent(this, AutoRestartReceiver::class.java))
         }
 

app/src/main/java/io/heckel/ntfy/service/SubscriberServiceManager.kt

@@ -2,6 +2,7 @@ package io.heckel.ntfy.service
 
 import android.content.Context
 import android.content.Intent
+import android.provider.Settings
 import androidx.preference.PreferenceManager
 import androidx.work.*
 import io.heckel.ntfy.app.Application
@@ -22,6 +23,7 @@ import kotlinx.coroutines.withContext
 class SubscriberServiceManager(private val context: Context) {
     fun refresh() {
         Log.d(TAG, "Enqueuing work to refresh subscriber service")
+
         val workManager = WorkManager.getInstance(context)
         val startServiceRequest = OneTimeWorkRequest.Builder(ServiceStartWorker::class.java).build()
         workManager.enqueueUniqueWork(WORK_NAME_ONCE, ExistingWorkPolicy.KEEP, startServiceRequest) // Unique avoids races!
@@ -46,10 +48,14 @@ class SubscriberServiceManager(private val context: Context) {
             }
 
             withContext(Dispatchers.IO) {
-                val app = context.applicationContext as Application
-                val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(app)
-                val preferenceKey = context.getString(R.string.eos_preference_key_is_enabled)
-                val action = if (sharedPreferences.getBoolean(preferenceKey, false)) {
+
+                val isEnabled = Settings.Global.getInt(
+                    context.contentResolver,
+                    context.getString(R.string.eos_preference_key_is_enabled),
+                    0
+                )
+
+                val action = if (isEnabled == 1) {
                     SubscriberService.Action.START
                 } else {
                     SubscriberService.Action.STOP

app/src/main/java/io/heckel/ntfy/ui/PreferencesFragment.kt

@@ -1,17 +1,12 @@
 package io.heckel.ntfy.ui
 
-import android.content.Context
 import android.content.Intent
 import android.os.Bundle
-import android.view.Menu
-import android.view.MenuInflater
-import android.view.MenuItem
-import android.widget.Toolbar
+import android.provider.Settings
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.SwitchPreferenceCompat
 import io.heckel.ntfy.R
 import io.heckel.ntfy.service.SubscriberService
-import io.heckel.ntfy.util.Log
 
 class PreferencesFragment : PreferenceFragmentCompat() {
 
@@ -23,6 +18,13 @@ class PreferencesFragment : PreferenceFragmentCompat() {
 
         preference?.setOnPreferenceChangeListener { _, newValue ->
             val isChecked = newValue as Boolean
+
+            Settings.Global.putInt(
+                requireContext().contentResolver,
+                requireContext().getString(R.string.eos_preference_key_is_enabled),
+                if (isChecked) 1 else 0
+            )
+
             val intent = Intent(context, SubscriberService::class.java)
             intent.action = if (isChecked) {
                 SubscriberService.Action.START.name