HarmonyOS鸿蒙Next中Flutter使用shared_preferences存储的，用的时候获取不到token

ArkTS侧同步Dart侧缓存的值。

1. 在Dart侧设置值。

final SharedPreferencesStorePlatform _prefs = SharedPreferencesOhos();
static const String _prefKey = 'flutter.counter';
_prefs.setValue('Int', _prefKey, 10)

1. ArkTS侧获取preferences，并同步和处理数据。

注意：shared_preferences中将preferences实例的名称设置为FlutterSharedPreferences，在ArkTS侧调用时需保持一致。

import common from '@ohos.app.ability.common';
import { FlutterPage } from '@ohos/flutter_ohos'
import { preferences } from '@kit.ArkData';

let storage = LocalStorage.getShared()
const EVENT_BACK_PRESS = 'EVENT_BACK_PRESS'

@Entry(storage)
@Component
struct Index {
  private context = this.getUIContext().getHostContext() as common.UIAbilityContext
  @LocalStorageLink('viewId') viewId: string = "";
  private dataPreferences: preferences.Preferences | null = null;

  build() {
   Stack(){
     Column() {
       FlutterPage({ viewId: this.viewId })
     }
     Column(){
       Button("获取preferences").onClick(()=>{
         // FlutterSharedPreferences:通过SharedPreferencesOhosPlugin文件获取
         let promise = preferences.getPreferences( this.context.getApplicationContext(), "FlutterSharedPreferences");
         promise.then((object) => {
           this.dataPreferences = object;
         }).catch((err: ESObject) => {
         })
       })
       Button("获取Dart侧设置的值").onClick(()=>{
         if (this.dataPreferences != null) {
           // key要与Flutter端设置的key一致
           let key = 'flutter.counter';
           let count = this.dataPreferences.getSync(key,0);
           console.log(count.toString());
         }
       })
       
     }
   }
  }

  onBackPress(): boolean {
    this.context.eventHub.emit(EVENT_BACK_PRESS)
    return true
  }
}

Dart侧同步ArkTS侧缓存的值。

1. 在ArkTS侧缓存值。

注意：shared_preferences中将preferences实例的名称设置为FlutterSharedPreferences，在ArkTS侧调用时需保持一致。

import common from '@ohos.app.ability.common';
import { FlutterPage } from '@ohos/flutter_ohos'
import { preferences } from '@kit.ArkData';

let storage = LocalStorage.getShared()
const EVENT_BACK_PRESS = 'EVENT_BACK_PRESS'

@Entry(storage)
@Component
struct Index {
  private context = this.getUIContext().getHostContext() as common.UIAbilityContext
  @LocalStorageLink('viewId') viewId: string = "";
  private  dataPreferences: preferences.Preferences | null = null;

  build() {
   Stack(){
     Column() {
       FlutterPage({ viewId: this.viewId })
     }
     Column(){
       Button("获取preferences").onClick(()=>{
         // FlutterSharedPreferences:通过SharedPreferencesOhosPlugin文件
         let promise = preferences.getPreferences( this.context.getApplicationContext(), "FlutterSharedPreferences");
         promise.then((object) => {
           this.dataPreferences = object;
         }).catch((err: ESObject) => {
         })
       })

       Button("ArkTS侧缓存值").onClick(()=>{
         if (this.dataPreferences != null) {
           this.dataPreferences.putSync("flutter.counter",1000);
           this.dataPreferences.flushSync();
         }
       })
     }
   }
  }

  onBackPress(): boolean {
    this.context.eventHub.emit(EVENT_BACK_PRESS)
    return true
  }
}

1. 在Dart侧获取ArkTS侧缓存的值。

final SharedPreferencesStorePlatform _prefs = SharedPreferencesOhos();
static const String _prefKey = 'flutter.counter';
Map<String, Object> maps = await _prefs.getAll();
int count = (maps[_prefKey] as int?) ?? 0;
print("获取ArkTS侧传的值：" + count.toString());