1. fix check boot on start opt.

2. fix late var flutterMethodChannel

flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/BootReceiver.kt

@@ -1,11 +1,15 @@
 package com.carriez.flutter_hbb
 
+import android.Manifest.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS
+import android.Manifest.permission.SYSTEM_ALERT_WINDOW
 import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
 import android.os.Build
 import android.util.Log
 import android.widget.Toast
+import com.hjq.permissions.XXPermissions
+import io.flutter.embedding.android.FlutterActivity
 
 const val DEBUG_BOOT_COMPLETED = "com.carriez.flutter_hbb.DEBUG_BOOT_COMPLETED"
 
@@ -16,6 +20,18 @@ class BootReceiver : BroadcastReceiver() {
         Log.d(logTag, "onReceive ${intent.action}")
 
         if (Intent.ACTION_BOOT_COMPLETED == intent.action || DEBUG_BOOT_COMPLETED == intent.action) {
+            // check SharedPreferences config
+            val prefs = context.getSharedPreferences(KEY_SHARED_PREFERENCES, FlutterActivity.MODE_PRIVATE)
+            if (!prefs.getBoolean(KEY_START_ON_BOOT_OPT, false)) {
+                Log.d(logTag, "KEY_START_ON_BOOT_OPT is false")
+                return
+            }
+            // check pre-permission
+            if (!XXPermissions.isGranted(context, REQUEST_IGNORE_BATTERY_OPTIMIZATIONS, SYSTEM_ALERT_WINDOW)){
+                Log.d(logTag, "REQUEST_IGNORE_BATTERY_OPTIMIZATIONS or SYSTEM_ALERT_WINDOW is not granted")
+                return
+            }
+
             val it = Intent(context, MainService::class.java).apply {
                 action = ACT_INIT_MEDIA_PROJECTION_AND_SERVICE
             }

flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainActivity.kt

@@ -24,7 +24,7 @@ import io.flutter.plugin.common.MethodChannel
 
 class MainActivity : FlutterActivity() {
     companion object {
-        lateinit var flutterMethodChannel: MethodChannel
+        var flutterMethodChannel: MethodChannel? = null
     }
 
     private val channelTag = "mChannel"
@@ -43,14 +43,14 @@ class MainActivity : FlutterActivity() {
             flutterEngine.dartExecutor.binaryMessenger,
             channelTag
         )
-        initFlutterChannel(flutterMethodChannel)
+        initFlutterChannel(flutterMethodChannel!!)
     }
 
     override fun onResume() {
         super.onResume()
         val inputPer = InputService.isOpen
         activity.runOnUiThread {
-            flutterMethodChannel.invokeMethod(
+            flutterMethodChannel?.invokeMethod(
                 "on_state_changed",
                 mapOf("name" to "input", "value" to inputPer.toString())
             )
@@ -67,7 +67,7 @@ class MainActivity : FlutterActivity() {
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
         if (requestCode == REQ_INVOKE_PERMISSION_ACTIVITY_MEDIA_PROJECTION && resultCode == RES_FAILED) {
-            flutterMethodChannel.invokeMethod("on_media_projection_canceled", null)
+            flutterMethodChannel?.invokeMethod("on_media_projection_canceled", null)
         }
     }
 
@@ -154,11 +154,11 @@ class MainActivity : FlutterActivity() {
                     }
                 }
                 "check_service" -> {
-                    Companion.flutterMethodChannel.invokeMethod(
+                    Companion.flutterMethodChannel?.invokeMethod(
                         "on_state_changed",
                         mapOf("name" to "input", "value" to InputService.isOpen.toString())
                     )
-                    Companion.flutterMethodChannel.invokeMethod(
+                    Companion.flutterMethodChannel?.invokeMethod(
                         "on_state_changed",
                         mapOf("name" to "media", "value" to MainService.isReady.toString())
                     )
@@ -169,7 +169,7 @@ class MainActivity : FlutterActivity() {
                         InputService.ctx?.disableSelf()
                     }
                     InputService.ctx = null
-                    Companion.flutterMethodChannel.invokeMethod(
+                    Companion.flutterMethodChannel?.invokeMethod(
                         "on_state_changed",
                         mapOf("name" to "input", "value" to InputService.isOpen.toString())
                     )

flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/MainService.kt

@@ -409,13 +409,13 @@ class MainService : Service() {
 
     fun checkMediaPermission(): Boolean {
         Handler(Looper.getMainLooper()).post {
-            MainActivity.flutterMethodChannel.invokeMethod(
+            MainActivity.flutterMethodChannel?.invokeMethod(
                 "on_state_changed",
                 mapOf("name" to "media", "value" to isReady.toString())
             )
         }
         Handler(Looper.getMainLooper()).post {
-            MainActivity.flutterMethodChannel.invokeMethod(
+            MainActivity.flutterMethodChannel?.invokeMethod(
                 "on_state_changed",
                 mapOf("name" to "input", "value" to InputService.isOpen.toString())
             )

flutter/android/app/src/main/kotlin/com/carriez/flutter_hbb/common.kt

@@ -59,7 +59,7 @@ fun requestPermission(context: Context, type: String) {
         .request { _, all ->
             if (all) {
                 Handler(Looper.getMainLooper()).post {
-                    MainActivity.flutterMethodChannel.invokeMethod(
+                    MainActivity.flutterMethodChannel?.invokeMethod(
                         "on_android_permission_result",
                         mapOf("type" to type, "result" to all)
                     )

flutter/lib/mobile/pages/settings_page.dart

@@ -36,7 +36,6 @@ const url = 'https://rustdesk.com/';
 class _SettingsState extends State<SettingsPage> with WidgetsBindingObserver {
   final _hasIgnoreBattery = androidVersion >= 26;
   var _ignoreBatteryOpt = false;
-  var _systemAlertWindow = false;
   var _enableStartOnBoot = false;
   var _enableAbr = false;
   var _denyLANDiscovery = false;
@@ -61,7 +60,7 @@ class _SettingsState extends State<SettingsPage> with WidgetsBindingObserver {
         }
       }
 
-      if (await checkAndUpdateSystemAlertWindow()) {
+      if (await checkAndUpdateStartOnBoot()) {
         update = true;
       }
 
@@ -69,7 +68,7 @@ class _SettingsState extends State<SettingsPage> with WidgetsBindingObserver {
       var enableStartOnBoot =
           await gFFI.invokeMethod(AndroidChannel.kGetStartOnBootOpt);
       if (enableStartOnBoot) {
-        if (!canStartOnBoot()) {
+        if (!await canStartOnBoot()) {
           enableStartOnBoot = false;
           gFFI.invokeMethod(AndroidChannel.kSetStartOnBootOpt, false);
         }
@@ -152,8 +151,9 @@ class _SettingsState extends State<SettingsPage> with WidgetsBindingObserver {
   void didChangeAppLifecycleState(AppLifecycleState state) {
     if (state == AppLifecycleState.resumed) {
       () async {
-        if (await checkAndUpdateIgnoreBatteryStatus() ||
+        final ibs = await checkAndUpdateIgnoreBatteryStatus();
-            await checkAndUpdateSystemAlertWindow()) {
+        final sob = await checkAndUpdateStartOnBoot();
+        if (ibs || sob) {
           setState(() {});
         }
       }();
@@ -171,10 +171,12 @@ class _SettingsState extends State<SettingsPage> with WidgetsBindingObserver {
     }
   }
 
-  Future<bool> checkAndUpdateSystemAlertWindow() async {
+  Future<bool> checkAndUpdateStartOnBoot() async {
-    final res = await AndroidPermissionManager.check(kSystemAlertWindow);
+    if (!await canStartOnBoot() && _enableStartOnBoot) {
-    if (_systemAlertWindow != res) {
+      _enableStartOnBoot = false;
-      _systemAlertWindow = res;
+      debugPrint(
+          "checkAndUpdateStartOnBoot and set _enableStartOnBoot -> false");
+      gFFI.invokeMethod(AndroidChannel.kSetStartOnBootOpt, false);
       return true;
     } else {
       return false;
@@ -461,12 +463,12 @@ class _SettingsState extends State<SettingsPage> with WidgetsBindingObserver {
     );
   }
 
-  bool canStartOnBoot() {
+  Future<bool> canStartOnBoot() async {
     // start on boot depends on ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS and SYSTEM_ALERT_WINDOW
     if (_hasIgnoreBattery && !_ignoreBatteryOpt) {
       return false;
     }
-    if (!_systemAlertWindow) {
+    if (!await AndroidPermissionManager.check(kSystemAlertWindow)) {
       return false;
     }
     return true;