1、初始化

在EntryAbility.ets中初始化

export default class EntryAbility extends UIAbility {
  async onCreate(want, launchParam) {
    // 1.加载用户首选项
    PreferenceUtil.loadPreference(this.context)
    

    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');
  }
}

2、使用

 // 1.保存首选项
PreferenceUtil.putPreferenceValue(PREF_KEY, true)



// 2.加载首选项
let isAgree = await PreferenceUtil.getPreferenceValue(PREF_KEY, false)

附： 

class PreferenceUtil{
  private pref: preferences.Preferences

  async loadPreference(context){
    try { // 加载preferences
      this.pref = await preferences.getPreferences(context, CommonConstants.H_STORE)
      Logger.debug(`加载Preferences[${CommonConstants.H_STORE}]成功`)
    } catch (e) {
      Logger.debug(`加载Preferences[${CommonConstants.H_STORE}]失败`, JSON.stringify(e))
    }
  }

  async putPreferenceValue(key: string, value: preferences.ValueType){
    if (!this.pref) {
      Logger.debug(`Preferences[${CommonConstants.H_STORE}]尚未初始化！`)
      return
    }
    try {
      // 写入数据
      await this.pref.put(key, value)
      // 刷盘
      await this.pref.flush()
      Logger.debug(`保存Preferences[${key} = ${value}]成功`)
    } catch (e) {
      Logger.debug(`保存Preferences[${key} = ${value}]失败`, JSON.stringify(e))
    }
  }

  async getPreferenceValue(key: string, defaultValue: preferences.ValueType){
    if (!this.pref) {
      Logger.debug(`Preferences[${CommonConstants.H_STORE}]尚未初始化！`)
      return
    }
    try {
      // 读数据
      let value = await this.pref.get(key, defaultValue)
      Logger.debug(`读取Preferences[${key} = ${value}]成功`)
      return value
    } catch (e) {
      Logger.debug(`读取Preferences[${key}]失败`, JSON.stringify(e))
    }
  }
}

const preferenceUtil = new PreferenceUtil()

export default preferenceUtil as PreferenceUtil