如何从java代码中访问在flutter中创建的共享首选项？

import 'package:flutter/services.dart';

// 创建MethodChannel对象
final MethodChannel channel = MethodChannel('your_channel_name');

// 定义获取共享首选项值的方法
Future<String> getSharedPreference() async {
  try {
    final String result = await channel.invokeMethod('getSharedPreference');
    return result;
  } catch (e) {
    return '';
  }
}

import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.plugin.common.MethodCall;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
import io.flutter.plugin.common.MethodChannel.Result;

public class YourPlugin implements FlutterPlugin, MethodCallHandler {
  private MethodChannel channel;

  @Override
  public void onAttachedToEngine(@NonNull FlutterPluginBinding flutterPluginBinding) {
    channel = new MethodChannel(flutterPluginBinding.getBinaryMessenger(), "your_channel_name");
    channel.setMethodCallHandler(this);
  }

  @Override
  public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
    if (call.method.equals("getSharedPreference")) {
      // 在这里实现获取共享首选项值的逻辑
      String sharedPreferenceValue = getSharedPreferenceValue();
      result.success(sharedPreferenceValue);
    } else {
      result.notImplemented();
    }
  }

  @Override
  public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
    channel.setMethodCallHandler(null);
    channel = null;
  }

  private String getSharedPreferenceValue() {
    // 在这里实现获取共享首选项值的逻辑
    // 返回共享首选项的值
    return "shared_preference_value";
  }
}

import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import your.package.name.YourPlugin;

public class MainActivity extends FlutterActivity {
  @Override
  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
    super.configureFlutterEngine(flutterEngine);
    flutterEngine.getPlugins().add(new YourPlugin());
  }
}

String sharedPreferenceValue = await getSharedPreference();
print(sharedPreferenceValue);