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.Preferencesasync loadPreference(context){try { // 加载preferencesthis.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