鸿蒙服务卡片，点击事件，传值

用来显示或者提示一些基本信息，或进行一些基本操作，不能使用重逻辑

新建：1、在ets目录上右击；2、选择Service Widget；3、Dynamic Widget

其中Static Widget，只能做静态页面，不能做数据交互

Dynamic Widget可以做动态数据，及事件处理

在entry的model.json5中，

 "extensionAbilities": [{"name": "EntryFormAbility","srcEntry": "./ets/entryformability/EntryFormAbility.ets","label": "$string:EntryFormAbility_label","description": "$string:EntryFormAbility_desc","type": "form","metadata": [{"name": "ohos.extension.form","resource": "$profile:form_config"}]}]

就是的ability，在这个ability上，就是卡片

在EntryFormAbility中，最主要的方法：onAddForm(),就是做主要的逻辑处理

在Resources / base / profile / form_config.json中，就是卡片的配置

{"forms": [{"name": "widget","displayName": "$string:widget_display_name","description": "$string:widget_desc","src": "./ets/widget/pages/WidgetCard.ets","uiSyntax": "arkts","window": {"designWidth": 720,"autoDesignWidth": true},"colorMode": "auto","isDynamic": true,"isDefault": true,"updateEnabled": false,"scheduledUpdateTime": "10:30","updateDuration": 1,"defaultDimension": "2*2","supportDimensions": ["2*2","2*4"]}]
}

卡片可以选择2*2和2*4

作用：展示数据、唤起应用；不支持包、不支持网络请求；

在应用的model.json5中，加入权限 

    'requestPermissions': [{"name": 'ohos.permission.KEEP_BACKGROUND_RUNNING'}],

WidgetCard.ets

@Entry
@Component
struct WidgetCard {@State num: number = 0build() {Row() {Column() {Button(this.num + '++').onClick(() => {this.num++postCardAction(this, {action: 'call',abilityName: 'EntryAbility',params:{method:'updataNum',num:this.num}});})}.width('100%')}.height('100%').onClick(() => {postCardAction(this, {action: 'router', //跳转事件abilityName: 'EntryAbility',});})}
}

应用的界面：

import { authentication } from '@kit.AccountKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { promptAction } from '@kit.ArkUI';@Entry
@Component
struct Index {@State message: string = 'Hello World';@StorageLink('num')num:number=0build() {RelativeContainer() {Text(this.message+this.num)}.height('100%').width('100%')}}

EntryAbility.ets

import { AbilityConstant, UIAbility, Want } from '@kit.AbilityKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { window } from '@kit.ArkUI';
import { rpc } from '@kit.IPCKit';class Params implements rpc.Parcelable{marshalling(dataOut: rpc.MessageSequence): boolean {return true}unmarshalling(dataIn: rpc.MessageSequence): boolean {return true}}class CaraParam{num:number=0
}export default class EntryAbility extends UIAbility {onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');this.callee.on('updataNum',(data)=>{let res=JSON.parse(data.readString())as CaraParamAppStorage.setOrCreate('num',res.num)return new Params()})}//销毁监听onDestroy(): void {this.callee.off('updataNum')hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onDestroy');}