feat(android,interface): Handle battery optimisation

packages/moxplatform_platform_interface/lib/src/api.g.dart

@@ -583,6 +583,55 @@ class MoxplatformApi {
     }
   }
 
+  Future<void> openBatteryOptimisationSettings() async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.moxplatform_platform_interface.MoxplatformApi.openBatteryOptimisationSettings',
+        codec,
+        binaryMessenger: _binaryMessenger);
+    final List<Object?>? replyList = await channel.send(null) as List<Object?>?;
+    if (replyList == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyList.length > 1) {
+      throw PlatformException(
+        code: replyList[0]! as String,
+        message: replyList[1] as String?,
+        details: replyList[2],
+      );
+    } else {
+      return;
+    }
+  }
+
+  Future<bool> isIgnoringBatteryOptimizations() async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.moxplatform_platform_interface.MoxplatformApi.isIgnoringBatteryOptimizations',
+        codec,
+        binaryMessenger: _binaryMessenger);
+    final List<Object?>? replyList = await channel.send(null) as List<Object?>?;
+    if (replyList == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyList.length > 1) {
+      throw PlatformException(
+        code: replyList[0]! as String,
+        message: replyList[1] as String?,
+        details: replyList[2],
+      );
+    } else if (replyList[0] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyList[0] as bool?)!;
+    }
+  }
+
   /// Contacts APIs
   Future<void> recordSentMessage(String arg_name, String arg_jid,
       String? arg_avatarPath, FallbackIconType arg_fallbackIcon) async {

packages/moxplatform_platform_interface/lib/src/platform.dart

@@ -4,4 +4,12 @@ abstract class PlatformImplementation {
 
   /// Returns the path where cache data should be stored.
   Future<String> getCacheDataPath();
+
+  /// Returns whether the app is battery-optimised (false) or
+  /// excluded from battery savings (true).
+  Future<bool> isIgnoringBatteryOptimizations();
+
+  /// Opens the page for battery optimisations. If not supported on the
+  /// platform, does nothing.
+  Future<void> openBatteryOptimisationSettings();
 }

packages/moxplatform_platform_interface/lib/src/platform_stub.dart

@@ -8,4 +8,10 @@ class StubPlatformImplementation extends PlatformImplementation {
   /// Returns the path where cache data should be stored.
   @override
   Future<String> getCacheDataPath() async => '';
+
+  @override
+  Future<bool> isIgnoringBatteryOptimizations() async => false;
+
+  @override
+  Future<void> openBatteryOptimisationSettings() async {}
 }