1/** 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16import data_preferences from '@ohos.data.preferences'; 17 18const NAME: string = "CONTACT_PREFERENCE"; 19type ValueType = number | string | boolean | Array<number> | Array<string> | Array<boolean>; 20 21class SharedPreferencesUtils { 22 private mPreferences: data_preferences.Preferences; 23 24 constructor() { 25 this.getPreferences().then((data) => { 26 this.mPreferences = data; 27 }) 28 } 29 30 /** 31 * getFromPreferences 32 * 33 * @return the value get from Preferences 34 */ 35 public async getFromPreferences(key: string, defValue) { 36 let preferences: data_preferences.Preferences = await this.getPreferences(); 37 return await preferences.get(key, defValue); 38 } 39 40 /** 41 * saveToPreferences 42 * 43 * @param key save to Preferences 44 * @param value save to Preferences 45 */ 46 public async saveToPreferences(key: string, value: ValueType) { 47 let preferences: data_preferences.Preferences = await this.getPreferences(); 48 await preferences.put(key, value); 49 preferences.flush() 50 } 51 52 private async getPreferences() { 53 if (this.mPreferences) { 54 return this.mPreferences; 55 } 56 return await data_preferences.getPreferences(globalThis.context, NAME); 57 } 58} 59 60export default new SharedPreferencesUtils();