鸿蒙开发-UIAbility

应用的根vc, UIAbility

UIAbility生命周期状态

UIAbility生命周期状态

WindowStageCreate和WindowStageDestroy状态

WindowStageCreate和WindowStageDestroy状态

import { UIAbility } from '@kit.AbilityKit';
import { window } from '@kit.ArkUI';
import { hilog } from '@kit.PerformanceAnalysisKit';


const TAG: string = '[EntryAbility]';
const DOMAIN_NUMBER: number = 0xFF00;


export default class EntryAbility extends UIAbility {
  // ...
  onWindowStageCreate(windowStage: window.WindowStage): void {
    // 设置WindowStage的事件订阅（获焦/失焦、切到前台/切到后台、前台可交互/前台不可交互）
    try {
      windowStage.on('windowStageEvent', (data) => {
        let stageEventType: window.WindowStageEventType = data;
        switch (stageEventType) {
          case window.WindowStageEventType.SHOWN: // 切到前台
            hilog.info(DOMAIN_NUMBER, TAG, `windowStage foreground.`);
            break;
          case window.WindowStageEventType.ACTIVE: // 获焦状态
            hilog.info(DOMAIN_NUMBER, TAG, `windowStage active.`);
            break;
          case window.WindowStageEventType.INACTIVE: // 失焦状态
            hilog.info(DOMAIN_NUMBER, TAG, `windowStage inactive.`);
            break;
          case window.WindowStageEventType.HIDDEN: // 切到后台
            hilog.info(DOMAIN_NUMBER, TAG, `windowStage background.`);
            break;
          case window.WindowStageEventType.RESUMED: // 前台可交互状态
            hilog.info(DOMAIN_NUMBER, TAG, `windowStage resumed.`);
            break;
          case window.WindowStageEventType.PAUSED: // 前台不可交互状态
            hilog.info(DOMAIN_NUMBER, TAG, `windowStage paused.`);
            break;
          default:
            break;
        }
      });
    } catch (exception) {
      hilog.error(DOMAIN_NUMBER, TAG,
        `Failed to enable the listener for window stage event changes. Cause: ${JSON.stringify(exception)}`);
    }
    hilog.info(DOMAIN_NUMBER, TAG, `%{public}s`, `Ability onWindowStageCreate`);
    // 设置UI加载
    windowStage.loadContent('pages/Index', (err, data) => {
      // ...
    });
  }
}

UIAbility的启动模式是指UIAbility实例在启动时的不同呈现状态。针对不同的业务场景，系统提供了三种启动模式：

• singleton（单实例模式）

• multiton（多实例模式）

• specified（指定实例模式）

UIAbility组件间交互（设备内）
https://developer.huawei.com/consumer/cn/training/course/slightMooc/C101717497122909477

一个UIAbility可以对应多个页面，在不同的场景下启动该UIAbility时需要展示不同的页面，例如从一个UIAbility的页面中跳转到另外一个UIAbility时，希望启动目标UIAbility的指定页面。

UIAbility的启动分为两种情况：UIAbility冷启动和UIAbility热启动。

• UIAbility冷启动：指的是UIAbility实例处于完全关闭状态下被启动，这需要完整地加载和初始化UIAbility实例的代码、资源等。
• UIAbility热启动：指的是UIAbility实例已经启动并在前台运行过，由于某些原因切换到后台，再次启动该UIAbility实例，这种情况下可以快速恢复UIAbility实例的状态。

冷启动后可以指定进入的页面

import { AbilityConstant, Want, UIAbility } from '@kit.AbilityKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { window, UIContext } from '@kit.ArkUI';


const DOMAIN_NUMBER: number = 0xFF00;
const TAG: string = '[EntryAbility]';


export default class EntryAbility extends UIAbility {
  funcAbilityWant: Want | undefined = undefined;
  uiContext: UIContext | undefined = undefined;


  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    // 接收调用方UIAbility传过来的参数
    this.funcAbilityWant = want;
  }


  onWindowStageCreate(windowStage: window.WindowStage): void {
    // Main window is created, set main page for this ability
    hilog.info(DOMAIN_NUMBER, TAG, '%{public}s', 'Ability onWindowStageCreate');
    // Main window is created, set main page for this ability
    let url = 'pages/Index';
    if (this.funcAbilityWant?.parameters?.router && this.funcAbilityWant.parameters.router === 'funcA') {
      url = 'pages/Page_ColdStartUp';
    }
    windowStage.loadContent(url, (err, data) => {
      // ...
    });
  }
}

热启动流程

image.png

主要代码

import { AbilityConstant, Want, UIAbility } from '@kit.AbilityKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import type { Router, UIContext } from '@kit.ArkUI';
import type { BusinessError } from '@kit.BasicServicesKit';


const DOMAIN_NUMBER: number = 0xFF00;
const TAG: string = '[EntryAbility]';


export default class EntryAbility extends UIAbility {
  funcAbilityWant: Want | undefined = undefined;
  uiContext: UIContext | undefined = undefined;
  // ...
  onNewWant(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    if (want?.parameters?.router && want.parameters.router === 'funcA') {
      let funcAUrl = 'pages/Page_HotStartUp';
      if (this.uiContext) {
        let router: Router = this.uiContext.getRouter();
        router.pushUrl({
          url: funcAUrl
        }).catch((err: BusinessError) => {
          hilog.error(DOMAIN_NUMBER, TAG, `Failed to push url. Code is ${err.code}, message is ${err.message}`);
        });
      }
    }
  }
}