Merge pull request #578 from OneSignal/android_push_prompt

Android 13 push prompting

Author: emawby

android/build.gradle

@@ -34,5 +34,5 @@ android {
 }
 
 dependencies {
-    api 'com.onesignal:OneSignal:4.7.3'
+    api 'com.onesignal:OneSignal:4.8.1'
 }

android/src/main/java/com/onesignal/flutter/OneSignalPlugin.java

@@ -278,8 +278,8 @@ private void userProvidedPrivacyConsent(MethodCall call, Result reply) {
   }
 
   private void promptPermission(MethodCall call, Result result) {
-    OneSignal.onesignalLog(OneSignal.LOG_LEVEL.ERROR, "promptPermission() is not applicable in Android");
-    replySuccess(result, null);
+    boolean fallback = call.argument("fallback");
+    OneSignal.promptForPushNotifications(fallback, new OSFlutterPromptForPushNotificationPermissionResponseHandler(messenger, channel, result, "promptPermission"));
   }
 
   private void getDeviceState(Result reply) {
@@ -567,6 +567,22 @@ public void onFailure(OneSignal.ExternalIdError error) {
     }
   }
 
+  static class OSFlutterPromptForPushNotificationPermissionResponseHandler extends OSFlutterHandler
+            implements OneSignal.PromptForPushNotificationPermissionResponseHandler {
+    OSFlutterPromptForPushNotificationPermissionResponseHandler(BinaryMessenger messenger, MethodChannel channel, Result res, String methodName) {
+      super(messenger, channel, res, methodName);
+    }
+      
+    @Override
+    public void response(boolean accepted) {
+      if (this.replySubmitted.getAndSet(true)) {
+        OneSignal.onesignalLog(OneSignal.LOG_LEVEL.DEBUG, "OneSignal " + methodName + " handler called twice, ignoring! response");
+        return;
+      }
+      replySuccess(result, accepted);
+    }
+  }
+
   static class OSFlutterPostNotificationHandler extends OSFlutterHandler
             implements OneSignal.PostNotificationResponseHandler {
 

example/android/app/build.gradle

@@ -29,7 +29,7 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 33
 
     lintOptions {
         disable 'InvalidPackage'
@@ -39,7 +39,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.onesignal.onesignalexample"
         minSdkVersion 16
-        targetSdkVersion 28
+        targetSdkVersion 33
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

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

@@ -23,6 +23,7 @@
         android:icon="@mipmap/ic_launcher">
         <activity
             android:name=".MainActivity"
+            android:exported="true"
             android:launchMode="singleTop"
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density"

lib/onesignal_flutter.dart

@@ -213,8 +213,9 @@ class OneSignal {
     return val as bool;
   }
 
-  /// in iOS, will prompt the user for permission to send push notifications.
-  //  in Android, it will always return false, since notification permission is by default given
+  // in iOS and Android 13+, will prompt the user for permission to send push notifications.
+  //  in lower Android versions it will always return false, since notification
+  //  permission is by default given
   Future<bool> promptUserForPushNotificationPermission(
       {bool fallbackToSettings = false}) async {
     dynamic result = await _channel.invokeMethod(