未处理的异常：使用 sqflite 运行 Flutter 应用程序时出现 MissingPluginException

Question

我正在尝试使用sqflite 插件来使用 SQLite 数据库。运行下面的应用程序会导致 Unhandled Exception: MissingPluginException 错误。 这是我的代码：

main.dart:

...
late final Database database;

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  database = await openDatabase(
    join(await getDatabasesPath(), 'mydb.db'),
    version: 1,
    onCreate: (db, version) {
      return db.execute('CREATE TABLE config(key TEXT PRIMARY KEY, value TEXT)');
    },
  );

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      title: 'MyApp',
      initialRoute: '/',
      onGenerateRoute: (settings) => onGenerateRoute(settings),
      onUnknownRoute: pageNotImplementedRoute,
    );
  }
}

Route? onGenerateRoute(RouteSettings settings) {
  ...
}

Route pageNotImplementedRoute(RouteSettings settings) {
  return MaterialPageRoute<void>(...);
}

这是运行的输出：

Launching lib\main.dart on Android SDK built for x86 64 in debug mode...
Running Gradle task 'assembleDebug'...
?  Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app.apk...
Debug service listening on ws://127.0.0.1:56398/fJzrmThsqQA=/ws
Syncing files to device Android SDK built for x86 64...
E/flutter ( 6173): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: MissingPluginException(No implementation found for method getDatabasesPath on channel com.tekartik.sqflite)
E/flutter ( 6173): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:154:7)
E/flutter ( 6173): <asynchronous suspension>
E/flutter ( 6173): #1      wrapDatabaseException (package:sqflite/src/exception_impl.dart:7:20)
E/flutter ( 6173): <asynchronous suspension>
E/flutter ( 6173): #2      SqfliteDatabaseFactoryMixin.getDatabasesPath (package:sqflite_common/src/factory_mixin.dart:152:20)
E/flutter ( 6173): <asynchronous suspension>
E/flutter ( 6173): #3      main (package:mymedica/main.dart:76:10)
E/flutter ( 6173): <asynchronous suspension>
E/flutter ( 6173): 

有人知道怎么回事吗？

Answer 1

这个错误只是因为 SQFLite 依赖没有得到它的包。你应该按照这个步骤。这对我有用...

1. flutter clean
2. 文件 > 缓存无效并重新启动
3. flutter pub get

你会得到你想要的结果。！