鸿蒙-任务栏右击退出 或 UIAbility窗口关闭，怎么弹框拦截

onPrepareToTerminate 需要配置权限 ohos.permission.PREPARE_APP_TERMINATE
参考链接：文档中心

import { emitter } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';
import { TipsDialog } from '@kit.ArkUI';

// entryAbility.ets 在你的uiability中添加如下生命周期
onPrepareToTerminate() {
  // 开发者定义预关闭动作
  emitter.emit("windowWillDestroy")
  emitter.on("close",(data)=>{
    this.context.terminateSelf();
  })
  return true; // 已定义预关闭操作后，返回true表示UIAbility取消关闭
}

// Index.ets:
@Entry
@Component
struct Page {
  @State message: string = 'Hello World';
  dialogControllerImage: CustomDialogController = new CustomDialogController({
    builder: TipsDialog({
      content: '想要关闭这个APP嘛?',
      primaryButton: {
        value: '取消',
        action: () => {
          console.info('Callback when the first button is clicked')
        },
      },
      secondaryButton: {
        value: '退出',
        role: ButtonRole.ERROR,
        action: () => {
          emitter.emit("close");
          console.info('Callback when the second button is clicked')
        }
      },
      onCheckedChange: () => {
        console.info('Callback when the checkbox is clicked')
      }
    }),
  })

  onPageShow(): void {
    emitter.on("windowWillDestroy", () => {
      let ablityContext = getContext() as common.UIAbilityContext // 这行没用到
      ablityContext.showAbility()    // 这行没用到
      console.log("yes")
      this.dialogControllerImage.open()
    })
  }

  build() {
    RelativeContainer() {
      Text(this.message)
        .id('PageHelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
    }
    .height('100%')
    .width('100%')
  }
}