提升应用冷启动速度示例

entry/src/main/
├── ets
│   ├── common
│   │   └── Logger.ts                     // 日志工具
│   ├── entryability
│   │   └── EntryAbility.ts               // UIAbility类
│   ├── myabilitystage
│   │   └── MyAbilityStage.ts             // AbilityStage类
│   └── pages
│       └── Index.ets                     // 首页
├── module.json5
└── resources
    ├── base
    │   ├── element
    │   │   ├── color.json
    │   │   └── string.json
    │   ├── media
    │   │   ├── highResolutionIcon.png    // 高分辨率图标
    │   │   ├── icon.png
    │   │   └── startIcon.png
    │   └── profile
    │       └── main_pages.json
    ├── en_US
    │   └── element
    │       └── string.json
    └── zh_CN
        └── element
            └── string.json

{
  "module": {
    "name": "entry",
    "type": "entry",
    "srcEntry": "./ets/myabilitystage/MyAbilityStage.ts",
    "description": "$string:module_desc",
    "mainElement": "EntryAbility",
    "deviceTypes": [
      "default"
    ],
    "deliveryWithInstall": true,
    "installationFree": false,
    "pages": "$profile:main_pages",
    "abilities": [
      {
        "name": "EntryAbility",
        "srcEntry": "./ets/entryability/EntryAbility.ts",
        "description": "$string:EntryAbility_desc",
        "icon": "$media:icon",
        "label": "$string:EntryAbility_label",
        "startWindowIcon": "$media:startIcon",	// 优化前为"$media:highResolutionIcon"
        "startWindowBackground": "$color:start_window_background",
        "exported": true,
        "skills": [
          {
            "entities": [
              "entity.system.home"
            ],
            "actions": [
              "action.system.home"
            ]
          }
        ]
      }
    ]
  }
}

// 优化减少import的模块
// import ability from '@ohos.ability.ability';
// import dataUriUtils from '@ohos.ability.dataUriUtils';
// import errorCode from '@ohos.ability.errorCode';
// import featureAbility from '@ohos.ability.featureAbility';
// import particleAbility from '@ohos.ability.particleAbility';
// import wantConstant from '@ohos.ability.wantConstant';
// import common from '@ohos.app.ability.common';
// import Configuration from '@ohos.app.ability.Configuration';
// import contextConstant from '@ohos.app.ability.contextConstant';
// import ConfigurationConstant from '@ohos.app.ability.ConfigurationConstant';
// import FormExtensionAbility from '@ohos.app.form.FormExtensionAbility';
// import GesturePath from '@ohos.accessibility.GesturePath';
// import GesturePoint from '@ohos.accessibility.GesturePoint';
// import distributedAccount from '@ohos.account.distributedAccount';
// import osAccount from '@ohos.account.osAccount';

import AbilityConstant from '@ohos.app.ability.AbilityConstant';
import UIAbility from '@ohos.app.ability.UIAbility';
import Want from '@ohos.app.ability.Want';
import window from '@ohos.window';
import logger from '../common/Logger';

export default class MyAbilityStage extends AbilityStage {
  onCreate(): void {
    // 应用的HAP在首次加载的时，为该Module初始化操作
    // 耗时操作
    // this.computeTask();
    this.computeTaskAsync(); // 异步任务
  }
  // ...
}

export default class EntryAbility extends UIAbility {
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    logger.info('Ability onCreate');
    // 耗时操作
    // this.computeTask();
    this.computeTaskAsync(); // 异步任务
  }
  // ...
}

@Entry
@Component
struct Index {
  // ...
  aboutToAppear() {
    // 耗时操作
    // this.computeTask();
    this.computeTaskAsync(); // 异步任务
    let context = getContext(this) as Context;
    this.text = context.resourceManager.getStringSync($r('app.string.startup_text'));
  }
  // ...
}

git init
git config core.sparsecheckout true
echo code/DocsSample/Ability/Performance/Startup/ > .git/info/sparse-checkout
git remote add origin https://gitee.com/openharmony/applications_app_samples.git
git pull origin master