网站内部链接的作用有哪些,中山做网站优化,供求信息网站建设报价,福建网站优化概述
本示例展示了同一设备中前后台的数据交互#xff0c;用户前台选择相应的商品与数目#xff0c;后台计算出结果#xff0c;回传给前台展示。
样例展示 基础信息 RPC连接
介绍
本示例使用[ohos.rpc]相关接口#xff0c;实现了一个前台选择商品和数目#xff0c;后台…概述
本示例展示了同一设备中前后台的数据交互用户前台选择相应的商品与数目后台计算出结果回传给前台展示。
样例展示 基础信息 RPC连接
介绍
本示例使用[ohos.rpc]相关接口实现了一个前台选择商品和数目后台计算总价的功能使用rpc进行前台和后台的通信。
效果预览
主页选择列表
使用说明
点击商品种类的空白方框弹出商品选择列表选择点击对应的商品空白方框显示相应内容。点击商品选择框后的 或 - 按钮选择商品所对应的数量。点击 Confirm an order 按钮根据相应的菜品数量与单价计算出总价并显示。
具体实现
发送数据在首页的sortString()中通过rpc.MessageSequence.create()创建MessageSequence对象然后通过MessageSequence.writeStringArray()将 我们的处理过的购物数据写入MessageSequence对象中通过rpc.RemoteObject.sendMessageRequest()将我们得出总价所需要的参数发送到进程中 源码参考[Index.ets]
/** Copyright (c) 2021-2023 Huawei Device Co., Ltd.* Licensed under the Apache License, Version 2.0 (the License);* you may not use this file except in compliance with the License.* You may obtain a copy of the License at** http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an AS IS BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/import rpc from ohos.rpcimport ReceivedData from ../model/ReceivedDataimport { ProcessData } from ../model/ProcessDataimport { Logger } from ../common/Loggerimport { MyDataSource } from ../model/OptionsDataimport { OPTIONS } from ../muck/MyDataimport { TitleBar } from ../common/TitleBarimport { FlexList } from ../common/FlexListconst REQUEST_CODE: number 1type SelectType {subcategory: string,count: number}EntryComponentstruct Index {State send: string State result: number 0private Process: ProcessData new ProcessData()private selectStuffs: ArraySelectType new Array(4).fill({ subcategory: , count: 0 })selectStuff(index: number, good: string, count: number) {Logger.info(index ${index}, count ${count}, good ${good})this.selectStuffs[index] { subcategory: good, count: count }}async sortString(sendData: Arraystring) {Logger.info(sortString is ${sendData})Logger.info(sendData typeof ${typeof (sendData)})let option: rpc.MessageOption new rpc.MessageOption()let data: rpc.MessageSequence rpc.MessageSequence.create()let reply: rpc.MessageSequence rpc.MessageSequence.create()Logger.info(getCallingUid: ${ReceivedData.getCallingUid()} getCallingPid: ${ReceivedData.getCallingPid()})data.writeStringArray(sendData)try {await ReceivedData.sendMessageRequest(REQUEST_CODE, data, reply, option)} catch (err) {Logger.error(sortString failed, ${JSON.stringify(err)})}this.result reply.readInt()reply.reclaim()}build() {Scroll() {Column() {TitleBar()LazyForEach(new MyDataSource(OPTIONS), (item, index) {Row() {FlexList({category: item.category,menu: item.subcategory,index: index,selectStuff: this.selectStuff.bind(this)})}}, item JSON.stringify(item))Column() {Row() {Text($r(app.string.final_price)).width(65%).height(25).fontSize(18).textAlign(TextAlign.Center)Text(this.result.toString()).id(totalPrice).height(25).fontSize(20).margin({ left: 5% }).textAlign(TextAlign.Center)}.justifyContent(FlexAlign.Center).width(80%)Button($r(app.string.confirm)).id(confirmOrderBtn).width(80%).height(40).margin({ top: 30 }).onClick(() {let priceArray this.Process.getPrice(this.selectStuffs)Logger.info(priceArray ${priceArray})this.sortString(priceArray)})}.width(100%).justifyContent(FlexAlign.Center).margin({ top: 20 }).height(30%)}.width(100%)}}}读取数据处理MessageRequest请求的接口封装在ReceivedData里面在这里接收传递来的数据然后经过处理得出总价 并通过rpc.MessageParcel.writeInt()写入MessageParcel对象源码参考[ReceivedData.ets]
/** Copyright (c) 2021-2023 Huawei Device Co., Ltd.* Licensed under the Apache License, Version 2.0 (the License);* you may not use this file except in compliance with the License.* You may obtain a copy of the License at** http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an AS IS BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/import rpc from ohos.rpcimport { Logger } from ../common/Loggerimport { PRICE_LIST } from ../muck/MyDataconst TAG [eTSRPC.ReceivedData]let resultList: Arraynumber Array.from({ length: 4 }, () 0)class ReceivedData extends rpc.RemoteObject {onRemoteRequest(code: number, data: rpc.MessageParcel, reply: rpc.MessageParcel, option: rpc.MessageOption): boolean {Logger.info(TAG, called)if (code 1) {let result 0let readIntArrtry {readIntArr data.readStringArray()} catch (err) {Logger.error(readStringArray failed, code is ${err.code}, message is ${err.message})}Logger.info(TAG, readIntArr ${readIntArr})for (let i 0; i 4; i) {if (readIntArr[i] 0) {resultList[i] 0} else {resultList[i] PRICE_LIST.get(readIntArr[i]) * Number(readIntArr[i4])}Logger.info(TAG, this.resultList ${resultList})result resultList[i]}try {reply.writeInt(result)} catch (err) {Logger.error(TAG, writeInt failed, code is ${err.code}, message is ${err.message})}Logger.info(TAG, result ${result})} else {Logger.info(TAG, unknown request code)}return true}}export default new ReceivedData(send)鸿蒙OpenHarmony知识待更新
