Pub地址：shared_preferences      Github地址：shared_preferences

一、初始化

final prefs = await SharedPreferences.getInstance();

二、使用

写数据：

// Save an integer value to 'counter' key.
await prefs.setInt('counter', 10);

// Save an boolean value to 'repeat' key.
await prefs.setBool('repeat', true);

// Save an double value to 'decimal' key.
await prefs.setDouble('decimal', 1.5);

// Save an String value to 'action' key.
await prefs.setString('action', 'Start');

// Save an list of strings to 'items' key.
await prefs.setStringList('items', <String>['Earth', 'Moon', 'Sun']);

读数据:

// Try reading data from the 'counter' key. If it doesn't exist, returns null.
final int? counter = prefs.getInt('counter');

// Try reading data from the 'repeat' key. If it doesn't exist, returns null.
final bool? repeat = prefs.getBool('repeat');

// Try reading data from the 'decimal' key. If it doesn't exist, returns null.
final double? decimal = prefs.getDouble('decimal');

// Try reading data from the 'action' key. If it doesn't exist, returns null.
final String? action = prefs.getString('action');

// Try reading data from the 'items' key. If it doesn't exist, returns null.
final List<String>? items = prefs.getStringList('items');

删除数据:

// Remove data for the 'counter' key.
final success = await prefs.remove('counter');

三、实战

结合Getx的依赖注入，将SharedPreferences实例异步注入，并在runAPP前初始化。

入口函数：

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Global.init();
  runApp(const MyApp());
}

util/global.dart:

class Global {
  static Future<void> init() async {
    // shared_preferences
    await Get.putAsync(() => SharedPreferences.getInstance());
  }
}