CacheUtil, caching tool class

Introduction and description of harmony-utils

---

harmony-utils A HarmonyOS tool library with rich features and extremely easy to use, with the help of many practical tools, is committed to helping developers quickly build Hongmeng applications. Its encapsulated tools cover APP, device, screen, authorization, notification, inter-thread communication, pop-up frames, toast, biometric authentication, user preferences, taking photos, albums, scanning codes, files, logs, exception capture, characters, strings, numbers, collections, dates, random, base64, encryption, decryption, JSON and other functions, which can meet various development needs.

picker_utils It is a sub-store split by harmony-utils, including PickerUtil, PhotoHelper, and ScanUtil.

Download and install

ohpm i @pura/harmony-utils

ohpm i @pura/picker_utils

  //Global initialization method, initialized in the onCreate method of UIAbility AppUtil.init()
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    AppUtil.init(this.context);
  }

API methods and usage

---

has Whether the data in the cache exists

  let pwd = CacheUtil.has("pwd");
  ToastUtil.showToast(`缓存是否存在：${pwd}`);

put Save data into cache

 CacheUtil.put("pwd", "ABCD@12345");
 ToastUtil.showToast("缓存密码成功");

get get the cached data

 let pwd = CacheUtil.get<string>("pwd");
 ToastUtil.showToast(`取值：${pwd}`);

remove delete the cache corresponding to the key

 CacheUtil.remove("pwd");
 ToastUtil.showToast(`缓存移除成功！`);

isEmpty determines whether the cache is empty

 let blEmpty = CacheUtil.isEmpty();
 ToastUtil.showToast(`缓存是否为空：${blEmpty}`);

clear clear cached data

 CacheUtil.clear();
 ToastUtil.showToast(`清除缓存数据成功`);

Full Code Example

import { router } from '@kit.ArkUI';
import { MockSetup } from '@ohos/hamock';
import { CacheUtil, ToastUtil } from '@pura/harmony-utils';
import { TitleBarView } from '../../component/TitleBarView';
import { DescribeBean } from '../../model/DescribeBean';

/**
 * "缓存工具类
 */
@Entry
@Component
struct Index {
  private scroller: Scroller = new Scroller();
  @State describe: DescribeBean = router.getParams() as DescribeBean;

  @MockSetup
  mock() {
    this.describe = new DescribeBean("CacheUtil", "缓存工具类");
  }

  build() {
    Column() {
      TitleBarView({ describe: this.describe })
      Divider()
      Scroll(this.scroller) {
        Column() {
          Button("put()")
            .btnStyle()
            .onClick(() => {
              CacheUtil.put("pwd", "ABCD@12345");
              ToastUtil.showToast("缓存密码成功");
            })
          Button("get()")
            .btnStyle()
            .onClick(() => {
              let pwd = CacheUtil.get<string>("pwd");
              ToastUtil.showToast(`取值：${pwd}`);
            })
          Button("has()")
            .btnStyle()
            .onClick(() => {
              let pwd = CacheUtil.has("pwd");
              ToastUtil.showToast(`缓存是否存在：${pwd}`);
            })
          Button("remove()")
            .btnStyle()
            .onClick(() => {
              CacheUtil.remove("pwd");
              ToastUtil.showToast(`缓存移除成功！`);
            })
          Button("isEmpty()")
            .btnStyle()
            .onClick(() => {
              let blEmpty = CacheUtil.isEmpty();
              ToastUtil.showToast(`缓存是否为空：${blEmpty}`);
            })
          Button("clear()")
            .btnStyle()
            .onClick(() => {
              CacheUtil.clear();
              ToastUtil.showToast(`清除缓存数据成功`);
            })

          Blank().layoutWeight(1)
        }
        .margin({ top: 5, bottom: 5 })
      }
      .layoutWeight(1)
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Start)
    .backgroundColor($r('app.color.main_background'))
  }
}


@Styles
function btnStyle() {
  .width('90%')
  .margin({ top: 10, bottom: 5 })
}