Add notificationPolicy permission on Android

permission_handler/CHANGELOG.md

 ## 8.1.0
 
 * Added support for iOS 12+ Critical Alerts permission requesting.
-* NOTE: This requires applying to Apple and recieving a special entitlement from them inorder to work. See [this article](https://medium.com/@shashidharyamsani/implementing-ios-critical-alerts-7d82b4bb5026) for an explination on how to use Critical Alerts. 
+    * NOTE: This requires applying to Apple and recieving a special entitlement from them inorder to work. See [this article](https://medium.com/@shashidharyamsani/implementing-ios-critical-alerts-7d82b4bb5026) for an explination on how to use Critical Alerts.
+* Added support for Android M+ Access Notification Policy permission requesting (ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS).
+    * Note: This opens a general page in settings, not specific to the package. 
 
 ## 8.0.1
 

permission_handler/README.md

@@ -139,11 +139,11 @@ You must list permission you want to use in your application :
    | PermissionGroup.photos                                                                      | NSPhotoLibraryUsageDescription                                                                                | PERMISSION_PHOTOS                    |
    | PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse | NSLocationUsageDescription, NSLocationAlwaysAndWhenInUseUsageDescription, NSLocationWhenInUseUsageDescription | PERMISSION_LOCATION                  |
    | PermissionGroup.notification                                                                | PermissionGroupNotification                                                                                   | PERMISSION_NOTIFICATIONS             |
-   | PermissionGroup.criticalAlerts                                                              | PermissionGroupCriticalAlerts                                                                                 | PERMISSION_CRITICAL_ALERTS           |
    | PermissionGroup.mediaLibrary                                                                | NSAppleMusicUsageDescription, kTCCServiceMediaLibrary                                                         | PERMISSION_MEDIA_LIBRARY             |
    | PermissionGroup.sensors                                                                     | NSMotionUsageDescription                                                                                      | PERMISSION_SENSORS                   |
    | PermissionGroup.bluetooth                                                                   | NSBluetoothAlwaysUsageDescription, NSBluetoothPeripheralUsageDescription                                      | PERMISSION_BLUETOOTH                 |
    | PermissionGroup.appTrackingTransparency                                                     | NSUserTrackingUsageDescription                                                                                | PERMISSION_APP_TRACKING_TRANSPARENCY |   
+   | PermissionGroup.criticalAlerts                                                              | PermissionGroupCriticalAlerts                                                                                 | PERMISSION_CRITICAL_ALERTS           |
 4. Clean & Rebuild
 
 </details>
@@ -223,6 +223,7 @@ The following permissions will show no dialog, but will open the corresponding s
 - manageExternalStorage
 - systemAlertWindow
 - requestInstallPackages
+- accessNotificationPolicy
 
 ## Issues
 

permission_handler/android/src/main/java/com/baseflow/permissionhandler/PermissionConstants.java

@@ -12,6 +12,7 @@ final class PermissionConstants {
     static final int PERMISSION_CODE_MANAGE_EXTERNAL_STORAGE = 210;
     static final int PERMISSION_CODE_SYSTEM_ALERT_WINDOW = 211;
     static final int PERMISSION_CODE_REQUEST_INSTALL_PACKAGES = 212;
+    static final int PERMISSION_CODE_ACCESS_NOTIFICATION_POLICY = 213;
 
     //PERMISSION_GROUP
     static final int PERMISSION_GROUP_CALENDAR = 0;
@@ -39,6 +40,9 @@ final class PermissionConstants {
     static final int PERMISSION_GROUP_MANAGE_EXTERNAL_STORAGE = 22;
     static final int PERMISSION_GROUP_SYSTEM_ALERT_WINDOW = 23;
     static final int PERMISSION_GROUP_REQUEST_INSTALL_PACKAGES = 24;
+    static final int PERMISSION_GROUP_APP_TRACK_TRANSPARENCY = 25;
+    static final int PERMISSION_GROUP_CRITICAL_ALERTS = 26;
+    static final int PERMISSION_GROUP_ACCESS_NOTIFICATION_POLICY = 27;
 
     @Retention(RetentionPolicy.SOURCE)
     @IntDef({
@@ -65,7 +69,8 @@ final class PermissionConstants {
             PERMISSION_GROUP_BLUETOOTH,
             PERMISSION_GROUP_MANAGE_EXTERNAL_STORAGE,
             PERMISSION_GROUP_SYSTEM_ALERT_WINDOW,
-            PERMISSION_GROUP_REQUEST_INSTALL_PACKAGES
+            PERMISSION_GROUP_REQUEST_INSTALL_PACKAGES,
+            PERMISSION_GROUP_ACCESS_NOTIFICATION_POLICY
     })
     @interface PermissionGroup {
     }

permission_handler/android/src/main/java/com/baseflow/permissionhandler/PermissionManager.java

 package com.baseflow.permissionhandler;
 
 import android.app.Activity;
+import android.app.Application;
+import android.app.Notification;
+import android.app.NotificationManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -38,7 +41,8 @@ final class PermissionManager implements PluginRegistry.ActivityResultListener,
         if (requestCode != PermissionConstants.PERMISSION_CODE_IGNORE_BATTERY_OPTIMIZATIONS &&
                 requestCode != PermissionConstants.PERMISSION_CODE_MANAGE_EXTERNAL_STORAGE &&
                 requestCode != PermissionConstants.PERMISSION_CODE_SYSTEM_ALERT_WINDOW &&
-                requestCode != PermissionConstants.PERMISSION_CODE_REQUEST_INSTALL_PACKAGES) {
+                requestCode != PermissionConstants.PERMISSION_CODE_REQUEST_INSTALL_PACKAGES &&
+                requestCode != PermissionConstants.PERMISSION_CODE_ACCESS_NOTIFICATION_POLICY) {
             return false;
         }
 
@@ -73,6 +77,16 @@ final class PermissionManager implements PluginRegistry.ActivityResultListener,
             } else {
                 return false;
             }
+        } else if (requestCode == PermissionConstants.PERMISSION_CODE_ACCESS_NOTIFICATION_POLICY) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                NotificationManager notificationManager = (NotificationManager) activity.getSystemService(Application.NOTIFICATION_SERVICE);
+                status = notificationManager.isNotificationPolicyAccessGranted()
+                        ? PermissionConstants.PERMISSION_STATUS_GRANTED
+                        : PermissionConstants.PERMISSION_STATUS_DENIED;
+                permission = PermissionConstants.PERMISSION_GROUP_ACCESS_NOTIFICATION_POLICY;
+            } else {
+                return false;
+            }
         } else {
             return false;
         }
@@ -255,6 +269,10 @@ final class PermissionManager implements PluginRegistry.ActivityResultListener,
                 executeIntent(
                         Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES,
                         PermissionConstants.PERMISSION_CODE_REQUEST_INSTALL_PACKAGES);
+            } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && permission == PermissionConstants.PERMISSION_GROUP_ACCESS_NOTIFICATION_POLICY) {
+                executeSimpleIntent(
+                        Settings.ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS,
+                        PermissionConstants.PERMISSION_CODE_ACCESS_NOTIFICATION_POLICY);
             } else {
                 permissionsToRequest.addAll(names);
             }
@@ -298,7 +316,7 @@ final class PermissionManager implements PluginRegistry.ActivityResultListener,
 
         //if no permissions were found then there is an issue and permission is not set in Android manifest
         if (names.size() == 0) {
-            Log.d(PermissionConstants.LOG_TAG, "No permissions found in manifest for: " + permission);
+            Log.d(PermissionConstants.LOG_TAG, "No permissions found in manifest for: " + names + permission);
 
             // On Android below M, the android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS flag in AndroidManifest.xml
             // may be ignored and not visible to the App as it's a new permission setting as a whole.
@@ -365,6 +383,15 @@ final class PermissionManager implements PluginRegistry.ActivityResultListener,
                     }
                 }
 
+                if (permission == PermissionConstants.PERMISSION_GROUP_ACCESS_NOTIFICATION_POLICY) {
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Application.NOTIFICATION_SERVICE);
+                        return notificationManager.isNotificationPolicyAccessGranted()
+                                ? PermissionConstants.PERMISSION_STATUS_GRANTED
+                                : PermissionConstants.PERMISSION_STATUS_DENIED;
+                    }
+                }
+
                 final int permissionStatus = ContextCompat.checkSelfPermission(context, name);
                 if (permissionStatus != PackageManager.PERMISSION_GRANTED) {
                     return PermissionConstants.PERMISSION_STATUS_DENIED;
@@ -382,6 +409,10 @@ final class PermissionManager implements PluginRegistry.ActivityResultListener,
         activity.startActivityForResult(intent, requestCode);
     }
 
+    private void executeSimpleIntent(String action, int requestCode) {
+        activity.startActivityForResult(new Intent(action), requestCode);
+    }
+
     void shouldShowRequestPermissionRationale(
             int permission,
             Activity activity,

permission_handler/android/src/main/java/com/baseflow/permissionhandler/PermissionUtils.java

@@ -67,6 +67,8 @@ public class PermissionUtils {
                 return PermissionConstants.PERMISSION_GROUP_SYSTEM_ALERT_WINDOW;
             case Manifest.permission.REQUEST_INSTALL_PACKAGES:
                 return PermissionConstants.PERMISSION_GROUP_REQUEST_INSTALL_PACKAGES;
+            case Manifest.permission.ACCESS_NOTIFICATION_POLICY:
+                return PermissionConstants.PERMISSION_GROUP_ACCESS_NOTIFICATION_POLICY;
             default:
                 return PermissionConstants.PERMISSION_GROUP_UNKNOWN;
         }
@@ -239,7 +241,12 @@ public class PermissionUtils {
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && hasPermissionInManifest(context, permissionNames, Manifest.permission.REQUEST_INSTALL_PACKAGES ))
                     permissionNames.add(Manifest.permission.REQUEST_INSTALL_PACKAGES);
                 break;
-
+            case PermissionConstants.PERMISSION_GROUP_ACCESS_NOTIFICATION_POLICY:
+                // The REQUEST_NOTIFICATION_POLICY permission is introduced in Android M, meaning we should
+                // not handle permissions on pre Android M devices.
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && hasPermissionInManifest(context, permissionNames, Manifest.permission.ACCESS_NOTIFICATION_POLICY ))
+                    permissionNames.add(Manifest.permission.ACCESS_NOTIFICATION_POLICY);
+                break;
             case PermissionConstants.PERMISSION_GROUP_NOTIFICATION:
             case PermissionConstants.PERMISSION_GROUP_MEDIA_LIBRARY:
             case PermissionConstants.PERMISSION_GROUP_PHOTOS:

permission_handler/example/android/app/src/main/AndroidManifest.xml

@@ -72,6 +72,9 @@
     <!-- Permissions options for the `request install packages` group -->
     <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
 
+    <!-- Permissions options for the `access notification policy` group -->
+    <uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY"/>
+
     <application
         android:name="io.flutter.app.FlutterApplication"
         android:icon="@mipmap/ic_launcher"

permission_handler/example/android/app/src/profile/AndroidManifest.xml

@@ -46,4 +46,7 @@
 
     <!-- Permissions options for the `sensors` group -->
     <uses-permission android:name="android.permission.BODY_SENSORS" />
+
+    <!-- Permissions options for the `access notification policy` group -->
+    <uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY"/>
 </manifest>

permission_handler/example/lib/main.dart

@@ -44,14 +44,16 @@ class _PermissionHandlerWidgetState extends State<PermissionHandlerWidget> {
                       permission != Permission.activityRecognition &&
                       permission != Permission.manageExternalStorage &&
                       permission != Permission.systemAlertWindow &&
-                      permission != Permission.requestInstallPackages;
+                      permission != Permission.requestInstallPackages &&
+                      permission != Permission.accessNotificationPolicy;
                 } else {
                   return permission != Permission.unknown &&
                       permission != Permission.mediaLibrary &&
                       permission != Permission.photos &&
                       permission != Permission.photosAddOnly &&
                       permission != Permission.reminders &&
-                      permission != Permission.appTrackingTransparency;
+                      permission != Permission.appTrackingTransparency &&
+                      permission != Permission.criticalAlerts;
                 }
               })
               .map((permission) => PermissionWidget(permission))

permission_handler/ios/Classes/PermissionHandlerEnums.h

@@ -104,6 +104,7 @@
 
 
 // ios: PermissionGroupCriticalAlerts
+// Info.plist: UNAuthorizationOptionCriticalAlert
 // dart: PermissionGroup.criticalAlerts
 #ifndef PERMISSION_CRITICAL_ALERTS
     #define PERMISSION_CRITICAL_ALERTS 0
@@ -136,7 +137,8 @@ typedef NS_ENUM(int, PermissionGroup) {
     PermissionGroupSystemAlertWindow,
     PermissionGroupRequestInstallPackages,
     PermissionGroupAppTrackingTransparency,
-    PermissionGroupCriticalAlerts
+    PermissionGroupCriticalAlerts,
+    PermissionGroupAccessNotificationPolicy,
 };
 
 typedef NS_ENUM(int, PermissionStatus) {

permission_handler_platform_interface/lib/src/permissions.dart

@@ -147,7 +147,6 @@ class Permission {
   ///iOS: Notifications that override your ringer
   static const criticalAlerts = Permission._(26);
 
-
   /// Returns a list of all possible [PermissionGroup] values.
   static const List<Permission> values = <Permission>[
     calendar,