feat：参照研听的基础工程

packages/android_oaid/lib/android_oaid.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+
+class AndroidOaidId {
+  const AndroidOaidId();
+
+  static const _methodChannel = MethodChannel('android_oaid');
+
+
+  Future<String?> getOaid() async {
+    final isAndroid =
+        !kIsWeb && defaultTargetPlatform == TargetPlatform.android;
+    if (!isAndroid) return null;
+
+    return _methodChannel.invokeMethod<String?>('getOaid');
+  }
+
+}