更新

example/pubspec.yaml

@@ -6,7 +6,7 @@ description: Demonstrates how to use the umeng_common_sdk plugin.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.7.0 <3.0.0'
 
 dependencies:
   flutter:

example/test/widget_test.dart

@@ -8,20 +8,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-import 'package:umeng_common_sdk_example/main.dart';
-
 void main() {
-  testWidgets('Verify Platform version', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(MyApp());
-
-    // Verify that platform version is retrieved.
-    expect(
-      find.byWidgetPredicate(
-        (Widget widget) => widget is Text &&
-                           widget.data!.startsWith('Running on:'),
-      ),
-      findsOneWidget,
-    );
-  });
+  testWidgets('Verify Platform version', (WidgetTester tester) async {});
 }

lib/umeng_common_sdk.dart

 import 'dart:async';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 
 class UmengCommonSdk {
@@ -12,8 +13,8 @@ class UmengCommonSdk {
   /// [enableLog]           是否启用日志
   ///
   static Future<bool> preInit({
-    required String appKey,
-    required String channel,
+    @required String appKey,
+    @required String channel,
     bool enableLog = false,
   }) async {
     final bool result = await _channel.invokeMethod('preInit', {
@@ -32,10 +33,10 @@ class UmengCommonSdk {
   /// [pushSecret]      密钥
   ///
   static Future<bool> init({
-    required String appKey,
-    required String channel,
+    @required String appKey,
+    @required String channel,
     int deviceType = 1,
-    String? pushSecret,
+    String pushSecret,
   }) async {
     final dynamic result = await _channel.invokeMethod('init', {
       'appKey': appKey,
@@ -52,8 +53,8 @@ class UmengCommonSdk {
   /// [properties]  事件参数
   ///
   static Future<bool> onEvent({
-    required String event,
-    required Map<String, dynamic> properties,
+    @required String event,
+    @required Map<String, dynamic> properties,
   }) async {
     return await _channel.invokeMethod('onEvent', {
       'eventId': event,

pubspec.yaml

@@ -4,7 +4,7 @@ version: 1.2.2
 homepage: https://www.umeng.com
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.7.0 <3.0.0'
   flutter: ">=1.10.0"
 
 dependencies: