HarmonyOS 鸿蒙Next首选项preferences封装
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1、EntryAbility获取Context并保存到AppStorage中，可直接在工具类中获取，无需传递

  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    AppStorage.setOrCreate<Context>(Constant.KEY_CONTEXT_ABILITY,this.context)
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');
  }
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 4px; right: 8px; font-size: 14px;">复制</button>

2、PreferUtil非业务工具类

import { preferences } from '@kit.ArkData'
import { PreferConstant } from './PreferConstant'
import { Context } from '@kit.AbilityKit'
import { Constant } from '../app/Constant'
export class PreferUtil {
static getStore(){
const context = AppStorage.get<Context>(Constant.KEY_CONTEXT_ABILITY)
return preferences.getPreferencesSync(context, {
name: PreferConstant.APP_STORE_DEFAULT
})
}
static put(key: string, value: preferences.ValueType) {
const store = PreferUtil.getStore()
store.putSync(key, value)
store.flush()
}
static get(key: string, defaultValue: preferences.ValueType) {
const store = PreferUtil.getStore()
return store.getSync(key, defaultValue)
}
static delete(key: string) {
const store = PreferUtil.getStore()
store.deleteSync(key)
store.flush()
}
}
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 4px; right: 8px; font-size: 14px;">复制</button>

3、分功能模块写管理工具类，如AppPreferHelper、UserHelper等

import { PreferConstant } from './PreferConstant'
import { PreferUtil } from './PreferUtil'
export class AppPreferHelper {
static saveToken(token: string) {
PreferUtil.put(PreferConstant.KEY_TOKEN, token)
}
static getToken() {
return PreferUtil.get(PreferConstant.KEY_TOKEN, “”) as string
}
}
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 4px; right: 8px; font-size: 14px;">复制</button>

4、常量类PreferConstant只放首选项相关

export class PreferConstant {
static APP_STORE_DEFAULT = “default_store” // 首选项仓库的key
static KEY_TOKEN=“token”
static KEY_USER_INFO=“userinfo”
}
<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 4px; right: 8px; font-size: 14px;">复制</button>