Fix exact alarm permission on Android 14 (#298)

Author: cyb3rko

app/src/main/kotlin/com/github/gotify/init/InitializationActivity.kt

@@ -1,12 +1,17 @@
 package com.github.gotify.init
 
 import android.Manifest
+import android.app.AlarmManager
 import android.app.NotificationManager
 import android.content.Context
 import android.content.Intent
+import android.net.Uri
 import android.os.Build
 import android.os.Bundle
+import androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult
+import androidx.annotation.RequiresApi
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.preference.PreferenceManager
 import com.github.gotify.NotificationSupport
@@ -34,6 +39,12 @@ internal class InitializationActivity : AppCompatActivity() {
     private lateinit var settings: Settings
     private var splashScreenActive = true
 
+    @RequiresApi(Build.VERSION_CODES.S)
+    private val activityResultLauncher =
+        registerForActivityResult(StartActivityForResult()) {
+            requestAlarmPermissionOrAuthenticate()
+        }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         Log.init(this)
@@ -54,14 +65,30 @@ internal class InitializationActivity : AppCompatActivity() {
         installSplashScreen().setKeepOnScreenCondition { splashScreenActive }
 
         if (settings.tokenExists()) {
-            runWithNeededPermissions {
-                tryAuthenticate()
+            runWithPostNotificationsPermission {
+                if (Build.VERSION.SDK_INT > Build.VERSION_CODES.TIRAMISU) {
+                    // Android 14 and above
+                    requestAlarmPermissionOrAuthenticate()
+                } else {
+                    // Android 13 and below
+                    tryAuthenticate()
+                }
             }
         } else {
             showLogin()
         }
     }
 
+    @RequiresApi(Build.VERSION_CODES.S)
+    private fun requestAlarmPermissionOrAuthenticate() {
+        val manager = ContextCompat.getSystemService(this, AlarmManager::class.java)
+        if (manager?.canScheduleExactAlarms() == true) {
+            tryAuthenticate()
+        } else {
+            alarmDialog()
+        }
+    }
+
     private fun showLogin() {
         splashScreenActive = false
         startActivity(Intent(this, LoginActivity::class.java))
@@ -109,6 +136,22 @@ internal class InitializationActivity : AppCompatActivity() {
             .show()
     }
 
+    @RequiresApi(Build.VERSION_CODES.S)
+    private fun alarmDialog() {
+        MaterialAlertDialogBuilder(this)
+            .setMessage(getString(R.string.permissions_alarm_prompt))
+            .setPositiveButton(getString(R.string.permissions_dialog_grant)) { _, _ ->
+                Intent(
+                    android.provider.Settings.ACTION_REQUEST_SCHEDULE_EXACT_ALARM,
+                    Uri.parse("package:$packageName")
+                ).apply {
+                    activityResultLauncher.launch(this)
+                }
+            }
+            .setCancelable(false)
+            .show()
+    }
+
     private fun authenticated(user: User) {
         Log.i("Authenticated as ${user.name}")
 
@@ -146,40 +189,30 @@ internal class InitializationActivity : AppCompatActivity() {
             .enqueue(Callback.callInUI(this, callback, errorCallback))
     }
 
-    private fun runWithNeededPermissions(action: () -> Unit) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+    private fun runWithPostNotificationsPermission(action: () -> Unit) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            // Android 13 and above
             val quickPermissionsOption = QuickPermissionsOptions(
                 handleRationale = true,
                 handlePermanentlyDenied = true,
                 rationaleMethod = { req -> processPermissionRationale(req) },
                 permissionsDeniedMethod = { req -> processPermissionRationale(req) },
                 permanentDeniedMethod = { req -> processPermissionsPermanentDenied(req) }
             )
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
-                // Android 13 and above
-                runWithPermissions(
-                    Manifest.permission.SCHEDULE_EXACT_ALARM,
-                    Manifest.permission.POST_NOTIFICATIONS,
-                    options = quickPermissionsOption,
-                    callback = action
-                )
-            } else {
-                // Android 12 and Android 12L
-                runWithPermissions(
-                    Manifest.permission.SCHEDULE_EXACT_ALARM,
-                    options = quickPermissionsOption,
-                    callback = action
-                )
-            }
+            runWithPermissions(
+                Manifest.permission.POST_NOTIFICATIONS,
+                options = quickPermissionsOption,
+                callback = action
+            )
         } else {
-            // Android 11 and below
+            // Android 12 and below
             action()
         }
     }
 
     private fun processPermissionRationale(req: QuickPermissionsRequest) {
         MaterialAlertDialogBuilder(this)
-            .setMessage(getString(R.string.permissions_denied_temp))
+            .setMessage(getString(R.string.permissions_notification_denied_temp))
             .setPositiveButton(getString(R.string.permissions_dialog_grant)) { _, _ ->
                 req.proceed()
             }
@@ -189,7 +222,7 @@ internal class InitializationActivity : AppCompatActivity() {
 
     private fun processPermissionsPermanentDenied(req: QuickPermissionsRequest) {
         MaterialAlertDialogBuilder(this)
-            .setMessage(getString(R.string.permissions_denied_permanent))
+            .setMessage(getString(R.string.permissions_notification_denied_permanent))
             .setPositiveButton(getString(R.string.permissions_dialog_grant)) { _, _ ->
                 req.openAppSettings()
             }

app/src/main/res/values/strings.xml

@@ -46,8 +46,9 @@
     <string name="login">Login</string>
     <string name="check_url">Check URL</string>
     <string name="permissions_dialog_grant">Grant</string>
-    <string name="permissions_denied_temp">Gotify requires permission to display push notifications.</string>
-    <string name="permissions_denied_permanent">Gotify requires permission to display push notifications. Please grant the required permission in the settings.</string>
+    <string name="permissions_notification_denied_temp">Gotify requires permission to display push notifications.</string>
+    <string name="permissions_notification_denied_permanent">Gotify requires permission to display push notifications. Please grant the required permission in the settings.</string>
+    <string name="permissions_alarm_prompt">Gotify requires permission to schedule reconnecting after connection is lost.</string>
     <string name="gotify_logo">Gotify logo</string>
     <string name="refresh_all">Refresh all</string>
     <string name="logout_confirm">Do you really want to logout?</string>