鸿蒙5：HarmonyOS应用开发-进程模型

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 2. 进程模型

系统的进程模型如下图所示

• 应用中（同一Bundle名称）的所有UIAbility、ServiceExtensionAbility和DataShareExtensionAbility均是运行在同一个独立进程（主进程）中，如下图中绿色部分的“Main Process”。
• 应用中（同一Bundle名称）的所有同一类型ExtensionAbility（除ServiceExtensionAbility和DataShareExtensionAbility外）均是运行在一个独立进程中，如下图中蓝色部分的“FormExtensionAbility Process”、“InputMethodExtensionAbility Process”、其他ExtensionAbility Process。
• WebView拥有独立的渲染进程，如下图中黄色部分的“Render Process”。

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编辑

2.1 公共事件机制

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编辑

通过一个应用向系统发送事件从而影响其他应用

系统定义公共事件

2.2 卡片与应用通信

先创建一个卡片

通过应用发送事件，通过卡片接收

通过卡片发送事件，通过应用接收

准备一个发布订阅工具

import commonEventManager from '@ohos.commonEventManager'

class SubscriberClass {
  subscriber?: commonEventManager.CommonEventSubscriber
  publishCount: number = 0

  publish(eventType: string, data: string = '') {
    commonEventManager.publish(eventType, { data }, (err) => {
    })
  }
  subscribe(eventType: string, callback: (event: string) => void) {
    // 1.创建订阅者
    commonEventManager.createSubscriber({ events: [eventType] }, (err, data) => {
      if (err) {
        return console.log('logData:', '创建订阅者失败')
      }
      // 2.data是订阅者
      this.subscriber = data
      if (this.subscriber) {
        // 3.订阅事件
        commonEventManager.subscribe(this.subscriber, (err, data) => {
          if (err) {
            return console.log('logData:', '订阅者事件失败')
          }
          if (data.data) {
            callback(data.data)
          }
        })
      }
    })
  }
}

export const subscriberClass = new SubscriberClass()

1.应用发

import { subscriberClass } from '../utils/SubscriberClass';

@Entry
  @Component
  struct Index {
    @State message: string = 'Hello World';

    build() {
      Column() {
        Button('测试通知卡片')
          .onClick(()=>{
            subscriberClass.publish('cardUpdate','time')
          })
      }
      .height('100%')
        .width('100%')
    }
  }

2.卡片收

import { formBindingData, FormExtensionAbility, formInfo, formProvider } from '@kit.FormKit';
import { Want } from '@kit.AbilityKit';
import { subscriberClass } from '../utils/SubscriberClass';

export default class EntryFormAbility extends FormExtensionAbility {
  onAddForm(want: Want) {
    // Called to return a FormBindingData object.
    let formData = '';
    let formId: string = want.parameters![formInfo.FormParam.IDENTITY_KEY] as string
    subscriberClass.subscribe('cardUpdate', (event) => {
      switch (event) {
        case 'time':
          formProvider.updateForm(formId, formBindingData.createFormBindingData({
            time: Date.now()
          }))
      }
    })
    return formBindingData.createFormBindingData(formData);
  }

  onCastToNormalForm(formId: string) {
    // Called when the form provider is notified that a temporary form is successfully
    // converted to a normal form.
  }

  onUpdateForm(formId: string) {
    // Called to notify the form provider to update a specified form.
  }

  onFormEvent(formId: string, message: string) {
    // Called when a specified message event defined by the form provider is triggered.
  }

  onRemoveForm(formId: string) {
    // Called to notify the form provider that a specified form has been destroyed.
  }

  onAcquireFormState(want: Want) {
    // Called to return a {@link FormState} object.
    return formInfo.FormState.READY;
  }
}

3.卡片页面

const localStorage = new LocalStorage()

@Entry(localStorage)
  @Component
  struct WidgetCard {
    @LocalStorageProp('time')
    time: number = 0

    build() {
      Column() {
        Text(this.time + '')
          .fontSize($r('app.float.font_size'))
          .fontWeight(FontWeight.Medium)
          .fontColor($r('app.color.item_title_font'))
      }
      .width('100%')
        .height('100%')
        .justifyContent(FlexAlign.Center)
    }
  }

4.卡片发

const localStorage = new LocalStorage()

@Entry(localStorage)
  @Component
  struct WidgetCard {
    @LocalStorageProp('time')
    time: number = 0

    build() {
      Column() {
        Text(this.time + '')
          .fontSize($r('app.float.font_size'))
          .fontWeight(FontWeight.Medium)
          .fontColor($r('app.color.item_title_font'))
        Button('测试通知应用')
          .onClick(()=>{
            postCardAction(this,{
              'action':'message'
            })
          })
      }
      .width('100%')
        .height('100%')
        .justifyContent(FlexAlign.Center)
    }
  }

5.卡片ability

  onFormEvent(formId: string, message: string) {
    // Called when a specified message event defined by the form provider is triggered.
    subscriberClass.publish('appUpdate',Date.now().toString())
  }

6.页面收

import { subscriberClass } from '../utils/SubscriberClass';

@Entry
  @Component
  struct Index {
    @State message: string = 'Hello World';

    aboutToAppear(): void {
      subscriberClass.subscribe('appUpdate', (event) => {
        this.message = event
      })
    }

    build() {
      Column() {
        Button('测试通知卡片')
          .onClick(() => {
            subscriberClass.publish('cardUpdate', 'time')
          })

        Text('当前卡片发送的消息:' + this.message)
      }
      .height('100%')
        .width('100%')
    }
  }

2.3 进程间通信服务(优化)

采用@ohos.rpc (RPC通信)改造卡片应用通信方案

卡片发：

 postCardAction(this, {
      action: 'call',
      abilityName: 'EntryAbility',
      params: {
        method: 'time'
      }
    })

应用收：

onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
    hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');
    this.callee.on("time", (data) => {
      //TODO:拿到数据可以进行响应的操作
      return new Params() // 只是为了不报错
    })
  }

HarmonyOS赋能资源丰富度建设（第四期）-吴东林

developer.huawei.com/consumer/cn…

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