pigeon: Add binding for getNotificationChannels

Author: rajveermalviya

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

@@ -402,6 +402,12 @@ private object NotificationsPigeonCodec : StandardMessageCodec() {
 
 /** Generated interface from Pigeon that represents a handler of messages from Flutter. */
 interface AndroidNotificationHostApi {
+  /**
+   * 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 `androidx.core.app.NotificationManagerCompat.createNotificationChannel`.
    *
@@ -469,6 +475,21 @@ interface AndroidNotificationHostApi {
     @JvmOverloads
     fun setUp(binaryMessenger: BinaryMessenger, api: AndroidNotificationHostApi?, messageChannelSuffix: String = "") {
       val separatedMessageChannelSuffix = if (messageChannelSuffix.isNotEmpty()) ".$messageChannelSuffix" else ""
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.zulip.AndroidNotificationHostApi.getNotificationChannels$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.createNotificationChannel$separatedMessageChannelSuffix", codec)
         if (api != null) {

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

@@ -43,6 +43,17 @@ fun toPigeonPerson(person: androidx.core.app.Person): Person {
 
 private class AndroidNotificationHost(val context: Context)
         : AndroidNotificationHostApi {
+    override fun getNotificationChannels(): List<NotificationChannel> {
+        return NotificationManagerCompat.from(context)
+            .notificationChannelsCompat
+            .map { NotificationChannel(
+                it.id,
+                it.importance.toLong(),
+                it.name?.toString(),
+                it.shouldShowLights()
+            ) }
+    }
+
     override fun createNotificationChannel(channel: NotificationChannel) {
         val notificationChannel = NotificationChannelCompat
             .Builder(channel.id, channel.importance.toInt()).apply {

lib/host/android_notifications.g.dart

@@ -375,6 +375,36 @@ class AndroidNotificationHostApi {
 
   final String __pigeon_messageChannelSuffix;
 
+  /// 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 `androidx.core.app.NotificationManagerCompat.createNotificationChannel`.
   ///
   /// See: https://developer.android.com/reference/androidx/core/app/NotificationManagerCompat#createNotificationChannel(androidx.core.app.NotificationChannelCompat)

pigeon/notifications.dart

@@ -155,6 +155,11 @@ class StatusBarNotification {
 
 @HostApi()
 abstract class AndroidNotificationHostApi {
+  /// Corresponds to `androidx.core.app.NotificationManagerCompat.getNotificationChannelsCompat`.
+  ///
+  /// See: https://developer.android.com/reference/kotlin/androidx/core/app/NotificationManagerCompat#getNotificationChannelsCompat()
+  List<NotificationChannel> getNotificationChannels();
+
   /// Corresponds to `androidx.core.app.NotificationManagerCompat.createNotificationChannel`.
   ///
   /// See: https://developer.android.com/reference/androidx/core/app/NotificationManagerCompat#createNotificationChannel(androidx.core.app.NotificationChannelCompat)

test/model/binding.dart

@@ -554,6 +554,12 @@ class FakeAndroidNotificationHostApi implements AndroidNotificationHostApi {
   }
   List<NotificationChannel> _createdChannels = [];
 
+  @override
+  Future<List<NotificationChannel?>> getNotificationChannels() {
+    // TODO: implement getNotificationChannels
+    throw UnimplementedError();
+  }
+
   @override
   Future<void> createNotificationChannel(NotificationChannel channel) async {
     _createdChannels.add(channel);