pigeon: Add binding for getNotificationChannels

Author: rajveermalviya

android/app/src/main/kotlin/com/zulip/flutter/Notifications.g.kt

@@ -408,6 +408,12 @@ interface AndroidNotificationHostApi {
    * See: https://developer.android.com/reference/androidx/core/app/NotificationManagerCompat#createNotificationChannel(androidx.core.app.NotificationChannelCompat)
    */
   fun createNotificationChannel(channel: NotificationChannel)
+  /**
+   * Corresponds to `androidx.core.app.NotificationManagerCompat.getNotificationChannelsCompat`.
+   *
+   * See: https://developer.android.com/reference/kotlin/androidx/core/app/NotificationManagerCompat#getNotificationChannelsCompat()
+   */
+  fun getNotificationChannels(): List<NotificationChannel>
   /**
    * Corresponds to `android.app.NotificationManager.notify`,
    * combined with `androidx.core.app.NotificationCompat.Builder`.
@@ -487,6 +493,21 @@ interface AndroidNotificationHostApi {
           channel.setMessageHandler(null)
         }
       }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.zulip.AndroidNotificationHostApi.getNotificationChannels$separatedMessageChannelSuffix", codec)
+        if (api != null) {
+          channel.setMessageHandler { _, reply ->
+            val wrapped: List<Any?> = try {
+              listOf(api.getNotificationChannels())
+            } catch (exception: Throwable) {
+              wrapError(exception)
+            }
+            reply.reply(wrapped)
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
       run {
         val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.zulip.AndroidNotificationHostApi.notify$separatedMessageChannelSuffix", codec)
         if (api != null) {

android/app/src/main/kotlin/com/zulip/flutter/ZulipPlugin.kt

@@ -53,6 +53,17 @@ private class AndroidNotificationHost(val context: Context)
         NotificationManagerCompat.from(context).createNotificationChannel(notificationChannel)
     }
 
+    override fun getNotificationChannels(): List<NotificationChannel> {
+        return NotificationManagerCompat.from(context)
+            .notificationChannelsCompat
+            .map { NotificationChannel(
+                id = it.id,
+                importance =  it.importance.toLong(),
+                name = it.name?.toString(),
+                lightsEnabled = it.shouldShowLights()
+            ) }
+    }
+
     @SuppressLint(
         // If permission is missing, `notify` will throw an exception.
         // Which hopefully will propagate to Dart, and then it's up to Dart code to handle it.

lib/host/android_notifications.g.dart

@@ -400,6 +400,36 @@ class AndroidNotificationHostApi {
     }
   }
 
+  /// Corresponds to `androidx.core.app.NotificationManagerCompat.getNotificationChannelsCompat`.
+  ///
+  /// See: https://developer.android.com/reference/kotlin/androidx/core/app/NotificationManagerCompat#getNotificationChannelsCompat()
+  Future<List<NotificationChannel?>> getNotificationChannels() async {
+    final String __pigeon_channelName = 'dev.flutter.pigeon.zulip.AndroidNotificationHostApi.getNotificationChannels$__pigeon_messageChannelSuffix';
+    final BasicMessageChannel<Object?> __pigeon_channel = BasicMessageChannel<Object?>(
+      __pigeon_channelName,
+      pigeonChannelCodec,
+      binaryMessenger: __pigeon_binaryMessenger,
+    );
+    final List<Object?>? __pigeon_replyList =
+        await __pigeon_channel.send(null) as List<Object?>?;
+    if (__pigeon_replyList == null) {
+      throw _createConnectionError(__pigeon_channelName);
+    } else if (__pigeon_replyList.length > 1) {
+      throw PlatformException(
+        code: __pigeon_replyList[0]! as String,
+        message: __pigeon_replyList[1] as String?,
+        details: __pigeon_replyList[2],
+      );
+    } else if (__pigeon_replyList[0] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (__pigeon_replyList[0] as List<Object?>?)!.cast<NotificationChannel?>();
+    }
+  }
+
   /// Corresponds to `android.app.NotificationManager.notify`,
   /// combined with `androidx.core.app.NotificationCompat.Builder`.
   ///

pigeon/notifications.dart

@@ -160,6 +160,11 @@ abstract class AndroidNotificationHostApi {
   /// See: https://developer.android.com/reference/androidx/core/app/NotificationManagerCompat#createNotificationChannel(androidx.core.app.NotificationChannelCompat)
   void createNotificationChannel(NotificationChannel channel);
 
+  /// Corresponds to `androidx.core.app.NotificationManagerCompat.getNotificationChannelsCompat`.
+  ///
+  /// See: https://developer.android.com/reference/kotlin/androidx/core/app/NotificationManagerCompat#getNotificationChannelsCompat()
+  List<NotificationChannel> getNotificationChannels();
+
   /// Corresponds to `android.app.NotificationManager.notify`,
   /// combined with `androidx.core.app.NotificationCompat.Builder`.
   ///

test/model/binding.dart

@@ -559,6 +559,11 @@ class FakeAndroidNotificationHostApi implements AndroidNotificationHostApi {
     _createdChannels.add(channel);
   }
 
+  @override
+  Future<List<NotificationChannel?>> getNotificationChannels() async {
+    return _createdChannels.toList(growable: false);
+  }
+
   /// Consume the log of calls made to [notify].
   ///
   /// This returns a list of the arguments to all calls made