HarmonyOSBaseLibs/src/main/ets/utils/PreferencesHelper.ets

import preferences from '@ohos.data.preferences';

export class PreferencesHelper {
  public static async put(key: string, value: preferences.ValueType|undefined) {

    const pref = await preferences.getPreferences(getContext(), 'PreferencesHelper')
    // 写入数据
    await pref.put(key, value)
    // 刷盘
    await pref.flush()
  }

  public static async get(key: string): Promise<preferences.ValueType> {
    return new Promise(async (resolve, reject) => {

      const pref = await preferences.getPreferences(getContext(), 'PreferencesHelper')
      pref.get(key, undefined).then((r1: preferences.ValueType) => {
        resolve(r1)
      })
    })

  }
}