wordpress 如何建站,企業(yè)免費自助建站平臺,黃浦建設(shè)機械網(wǎng)站,做的好的營銷型網(wǎng)站有哪些內(nèi)容Harmony開發(fā)之跨設(shè)備調(diào)用——遠(yuǎn)程啟動Ability 引入#xff1a;打破設(shè)備邊界的應(yīng)用能力 在傳統(tǒng)的移動應(yīng)用開發(fā)中#xff0c;每個應(yīng)用都運行在獨立的設(shè)備上#xff0c;設(shè)備間的應(yīng)用能力無法共享。而HarmonyOS的跨設(shè)備調(diào)用能力#xff0c;讓應(yīng)用可以像調(diào)用本地Ability一樣打破設(shè)備邊界的應(yīng)用能力在傳統(tǒng)的移動應(yīng)用開發(fā)中每個應(yīng)用都運行在獨立的設(shè)備上設(shè)備間的應(yīng)用能力無法共享。而HarmonyOS的跨設(shè)備調(diào)用能力讓應(yīng)用可以像調(diào)用本地Ability一樣無縫調(diào)用其他設(shè)備上的Ability真正實現(xiàn)了一次開發(fā)多端部署跨端流轉(zhuǎn)的分布式體驗。想象一下這樣的場景你在手機上瀏覽一篇長文走到客廳后可以繼續(xù)在智慧屏上閱讀在平板上編輯文檔時可以直接調(diào)用手機上的攝像頭拍照插入圖片。這些場景的實現(xiàn)都依賴于HarmonyOS的跨設(shè)備調(diào)用能力。一、跨設(shè)備調(diào)用核心概念1.1 什么是跨設(shè)備調(diào)用跨設(shè)備調(diào)用Cross-Device Call是指一個設(shè)備上的應(yīng)用能夠發(fā)現(xiàn)、連接并調(diào)用另一個設(shè)備上的Ability就像調(diào)用本地Ability一樣簡單。這種能力基于HarmonyOS的分布式軟總線技術(shù)實現(xiàn)了設(shè)備間的能力共享和協(xié)同。1.2 核心組件Want跨設(shè)備調(diào)用的核心載體封裝了目標(biāo)Ability的信息和調(diào)用意圖。WantAgentWant的封裝器用于延遲執(zhí)行Want常用于通知、快捷方式等場景。AbilityManager提供跨設(shè)備調(diào)用的管理接口包括啟動、連接、斷開等操作。1.3 調(diào)用模式對比調(diào)用模式特點適用場景隱式啟動通過action匹配目標(biāo)Ability系統(tǒng)自動選擇通用功能調(diào)用如拍照、分享顯式啟動明確指定目標(biāo)Ability的bundleName和abilityName特定應(yīng)用間的協(xié)同帶返回值啟動啟動Ability并等待返回結(jié)果需要獲取返回數(shù)據(jù)的場景連接模式建立長連接持續(xù)通信跨設(shè)備數(shù)據(jù)同步、遠(yuǎn)程控制二、Want與WantAgent詳解2.1 Want基本結(jié)構(gòu)Want是跨設(shè)備調(diào)用的核心數(shù)據(jù)結(jié)構(gòu)包含以下關(guān)鍵信息interface Want { deviceId?: string; // 目標(biāo)設(shè)備ID空表示本地設(shè)備 bundleName?: string; // 目標(biāo)應(yīng)用包名 abilityName?: string; // 目標(biāo)Ability名稱 action?: string; // 動作標(biāo)識 entities?: string[]; // 實體類型 uri?: string; // URI數(shù)據(jù) type?: string; // MIME類型 parameters?: { [key: string]: any }; // 參數(shù)數(shù)據(jù) }2.2 WantAgent工作流程WantAgent是對Want的封裝支持延遲執(zhí)行和權(quán)限控制// WantAgent創(chuàng)建流程 const wantAgentInfo: WantAgent.WantAgentInfo { wants: [want], // 要執(zhí)行的Want數(shù)組 operationType: WantAgent.OperationType.START_ABILITIES, // 操作類型 requestCode: 0, // 請求碼用于回調(diào)識別 wantAgentFlags: [WantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG] // 標(biāo)志位 };三、跨設(shè)備調(diào)用實戰(zhàn)開發(fā)3.1 權(quán)限配置在module.json5中配置跨設(shè)備調(diào)用所需權(quán)限{ reqPermissions: [ { name: ohos.permission.DISTRIBUTED_DATASYNC, reason: 跨設(shè)備數(shù)據(jù)同步 }, { name: ohos.permission.DISTRIBUTED_DEVICE_STATE_CHANGE, reason: 監(jiān)聽設(shè)備狀態(tài)變化 }, { name: ohos.permission.GET_DISTRIBUTED_DEVICE_INFO, reason: 獲取分布式設(shè)備信息 } ] }3.2 隱式啟動遠(yuǎn)程Ability通過action匹配方式啟動遠(yuǎn)程Abilityimport { AbilityConstant, common, UIAbility } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; async function startRemoteAbilityByAction(): Promisevoid { try { const want { action: action.system.open, // 系統(tǒng)打開動作 entities: [entity.system.browser], // 瀏覽器實體 uri: https://www.example.com, // 要打開的URL type: text/html }; const context getContext(this) as common.UIAbilityContext; await context.startAbility(want); hilog.info(0x0000, testTag, Remote ability started successfully); } catch (error) { hilog.error(0x0000, testTag, Failed to start remote ability: ${JSON.stringify(error)}); } }3.3 顯式啟動遠(yuǎn)程Ability明確指定目標(biāo)Ability的詳細(xì)信息import { AbilityConstant, common, UIAbility } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; async function startRemoteAbilityExplicitly(): Promisevoid { try { const want { deviceId: 1234567890, // 目標(biāo)設(shè)備ID bundleName: com.example.remoteapp, abilityName: RemoteAbility, parameters: { key1: value1, key2: 100 } }; const context getContext(this) as common.UIAbilityContext; await context.startAbility(want); hilog.info(0x0000, testTag, Remote ability started successfully); } catch (error) { hilog.error(0x0000, testTag, Failed to start remote ability: ${JSON.stringify(error)}); } }3.4 帶返回值啟動遠(yuǎn)程Ability啟動遠(yuǎn)程Ability并等待返回結(jié)果import { AbilityConstant, common, UIAbility } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; async function startRemoteAbilityForResult(): Promisevoid { try { const want { deviceId: 1234567890, bundleName: com.example.remoteapp, abilityName: RemoteAbility, parameters: { requestData: some data } }; const context getContext(this) as common.UIAbilityContext; await context.startAbilityForResult(want, (error: BusinessError, data: AbilityConstant.AbilityResult) { if (error) { hilog.error(0x0000, testTag, Ability result error: ${JSON.stringify(error)}); return; } if (data.resultCode AbilityConstant.ResultCode.RESULT_OK) { const resultData data.want?.parameters; hilog.info(0x0000, testTag, Ability result: ${JSON.stringify(resultData)}); } else { hilog.warn(0x0000, testTag, Ability result canceled: ${data.resultCode}); } }); } catch (error) { hilog.error(0x0000, testTag, Failed to start remote ability: ${JSON.stringify(error)}); } }3.5 連接遠(yuǎn)程Ability建立與遠(yuǎn)程Ability的長連接import { AbilityConstant, common, UIAbility } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; class RemoteConnection implements common.RemoteAbilityConnection { private connectionId: number -1; private remoteProxy: common.RemoteProxy | null null; // 連接建立回調(diào) onAbilityConnectDone(elementName: common.ElementName, remote: common.RemoteProxy, resultCode: number): void { if (resultCode 0) { this.connectionId elementName.abilityName.length; this.remoteProxy remote; hilog.info(0x0000, testTag, Remote ability connected successfully); // 發(fā)送數(shù)據(jù)到遠(yuǎn)程Ability this.sendDataToRemote(); } else { hilog.error(0x0000, testTag, Failed to connect remote ability: ${resultCode}); } } // 連接斷開回調(diào) onAbilityDisconnectDone(elementName: common.ElementName, resultCode: number): void { hilog.info(0x0000, testTag, Remote ability disconnected); this.connectionId -1; this.remoteProxy null; } // 發(fā)送數(shù)據(jù)到遠(yuǎn)程Ability async sendDataToRemote(): Promisevoid { if (!this.remoteProxy) { return; } try { const data { message: Hello from local device, timestamp: Date.now() }; await this.remoteProxy.sendRequest(1, data, {}); hilog.info(0x0000, testTag, Data sent to remote ability); } catch (error) { hilog.error(0x0000, testTag, Failed to send data: ${JSON.stringify(error)}); } } // 建立連接 async connectRemoteAbility(): Promisevoid { try { const want { deviceId: 1234567890, bundleName: com.example.remoteapp, abilityName: RemoteServiceAbility }; const context getContext(this) as common.UIAbilityContext; await context.connectAbility(want, this); hilog.info(0x0000, testTag, Connecting to remote ability...); } catch (error) { hilog.error(0x0000, testTag, Failed to connect remote ability: ${JSON.stringify(error)}); } } // 斷開連接 async disconnectRemoteAbility(): Promisevoid { if (this.connectionId -1) { return; } try { const context getContext(this) as common.UIAbilityContext; await context.disconnectAbility(this); hilog.info(0x0000, testTag, Disconnecting from remote ability...); } catch (error) { hilog.error(0x0000, testTag, Failed to disconnect: ${JSON.stringify(error)}); } } } // 使用示例 const remoteConnection new RemoteConnection(); await remoteConnection.connectRemoteAbility();四、遠(yuǎn)程Ability的實現(xiàn)4.1 Service Ability實現(xiàn)遠(yuǎn)程Service Ability需要實現(xiàn)IAbilityConnection接口import { AbilityConstant, common, UIAbility } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; export default class RemoteServiceAbility extends UIAbility { private connection: common.RemoteAbilityConnection | null null; onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void { hilog.info(0x0000, testTag, RemoteServiceAbility onCreate); // 注冊連接回調(diào) this.connection { onAbilityConnectDone: this.onConnectDone.bind(this), onAbilityDisconnectDone: this.onDisconnectDone.bind(this) }; } onConnectDone(elementName: common.ElementName, remote: common.RemoteProxy, resultCode: number): void { if (resultCode 0) { hilog.info(0x0000, testTag, Remote client connected); // 設(shè)置消息處理回調(diào) remote.setReceiveRequestCallback(this.handleRequest.bind(this)); } } onDisconnectDone(elementName: common.ElementName, resultCode: number): void { hilog.info(0x0000, testTag, Remote client disconnected); } // 處理來自客戶端的請求 handleRequest(code: number, data: any, reply: common.MessageParcel, option: common.MessageOption): void { hilog.info(0x0000, testTag, Received request code: ${code}, data: ${JSON.stringify(data)}); switch (code) { case 1: // 處理消息請求 this.handleMessageRequest(data, reply); break; case 2: // 處理數(shù)據(jù)請求 this.handleDataRequest(data, reply); break; default: hilog.warn(0x0000, testTag, Unknown request code: ${code}); reply.writeInt(AbilityConstant.ResultCode.RESULT_CANCELED); } } // 處理消息請求 private handleMessageRequest(data: any, reply: common.MessageParcel): void { const message data.message; hilog.info(0x0000, testTag, Received message: ${message}); // 處理消息并返回結(jié)果 const result { status: success, receivedAt: Date.now(), processedMessage: message.toUpperCase() }; reply.writeInt(AbilityConstant.ResultCode.RESULT_OK); reply.writeString(JSON.stringify(result)); } // 處理數(shù)據(jù)請求 private handleDataRequest(data: any, reply: common.MessageParcel): void { const requestData data.requestData; hilog.info(0x0000, testTag, Processing data: ${JSON.stringify(requestData)}); // 模擬數(shù)據(jù)處理 const processedData this.processData(requestData); reply.writeInt(AbilityConstant.ResultCode.RESULT_OK); reply.writeString(JSON.stringify(processedData)); } // 數(shù)據(jù)處理邏輯 private processData(data: any): any { return { original: data, processed: true, timestamp: Date.now(), result: Data processed successfully }; } }4.2 Page Ability實現(xiàn)遠(yuǎn)程Page Ability需要處理啟動參數(shù)和返回結(jié)果import { AbilityConstant, common, UIAbility } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; export default class RemotePageAbility extends UIAbility { private result: AbilityConstant.AbilityResult { resultCode: AbilityConstant.ResultCode.RESULT_CANCELED, want: undefined }; onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void { hilog.info(0x0000, testTag, RemotePageAbility onCreate); // 處理啟動參數(shù) const parameters want.parameters; if (parameters) { hilog.info(0x0000, testTag, Launch parameters: ${JSON.stringify(parameters)}); } } onNewWant(want: Want, launchParam: AbilityConstant.LaunchParam): void { hilog.info(0x0000, testTag, RemotePageAbility onNewWant); } onDestroy(): void { hilog.info(0x0000, testTag, RemotePageAbility onDestroy); } // 設(shè)置返回結(jié)果 setResult(resultCode: number, resultData?: any): void { this.result.resultCode resultCode; if (resultData) { this.result.want { parameters: resultData }; } } // 返回結(jié)果給調(diào)用方 terminateSelfWithResult(): void { const context getContext(this) as common.UIAbilityContext; context.terminateSelfWithResult(this.result, (error: BusinessError) { if (error) { hilog.error(0x0000, testTag, Failed to terminate with result: ${JSON.stringify(error)}); } }); } }五、WantAgent高級用法5.1 創(chuàng)建WantAgentimport { WantAgent } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; async function createWantAgent(): PromiseWantAgent.WantAgent { try { const want { action: action.system.open, entities: [entity.system.browser], uri: https://www.example.com }; const wantAgentInfo: WantAgent.WantAgentInfo { wants: [want], operationType: WantAgent.OperationType.START_ABILITIES, requestCode: 1001, wantAgentFlags: [WantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG] }; const wantAgent await WantAgent.getWantAgent(wantAgentInfo); hilog.info(0x0000, testTag, WantAgent created successfully); return wantAgent; } catch (error) { hilog.error(0x0000, testTag, Failed to create WantAgent: ${JSON.stringify(error)}); throw error; } }5.2 觸發(fā)WantAgentimport { WantAgent } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; async function triggerWantAgent(wantAgent: WantAgent.WantAgent): Promisevoid { try { await WantAgent.trigger(wantAgent, undefined, { onCompleted: (code: number, result: any, want: Want) { hilog.info(0x0000, testTag, WantAgent triggered, code: ${code}); } }); } catch (error) { hilog.error(0x0000, testTag, Failed to trigger WantAgent: ${JSON.stringify(error)}); } }5.3 在通知中使用WantAgentimport { notificationManager } from kit.NotificationKit; import { WantAgent } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; async function createNotificationWithWantAgent(): Promisevoid { try { // 創(chuàng)建WantAgent const want { action: action.system.open, entities: [entity.system.browser], uri: https://www.example.com }; const wantAgentInfo: WantAgent.WantAgentInfo { wants: [want], operationType: WantAgent.OperationType.START_ABILITIES, requestCode: 1002 }; const wantAgent await WantAgent.getWantAgent(wantAgentInfo); // 創(chuàng)建通知 const notificationRequest: notificationManager.NotificationRequest { id: 1001, slotId: default_slot, content: { notificationContentType: notificationManager.ContentType.NOTIFICATION_CONTENT_BASIC_TEXT, normal: { title: 跨設(shè)備通知, text: 點擊打開遠(yuǎn)程瀏覽器 } }, wantAgent: wantAgent }; await notificationManager.publish(notificationRequest); hilog.info(0x0000, testTag, Notification with WantAgent published); } catch (error) { hilog.error(0x0000, testTag, Failed to create notification: ${JSON.stringify(error)}); } }六、完整實戰(zhàn)案例跨設(shè)備文件共享6.1 場景描述實現(xiàn)一個跨設(shè)備文件共享應(yīng)用用戶可以在手機端選擇文件通過跨設(shè)備調(diào)用將文件發(fā)送到平板端平板端接收文件并顯示傳輸進(jìn)度。6.2 手機端實現(xiàn)發(fā)送方import { AbilityConstant, common, UIAbility } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; import { fileIo } from kit.FileKit; class FileSenderAbility extends UIAbility { private remoteConnection: common.RemoteAbilityConnection | null null; private filePath: string ; private targetDeviceId: string ; // 選擇文件并發(fā)送 async selectAndSendFile(): Promisevoid { try { // 選擇文件實際應(yīng)用中需要文件選擇器 this.filePath /data/storage/el2/base/files/sample.txt; // 讀取文件內(nèi)容 const fileContent await this.readFile(this.filePath); // 建立遠(yuǎn)程連接 await this.connectToReceiver(); // 發(fā)送文件 await this.sendFile(fileContent); } catch (error) { hilog.error(0x0000, testTag, File send failed: ${JSON.stringify(error)}); } } // 建立到接收方的連接 async connectToReceiver(): Promisevoid { const want { deviceId: this.targetDeviceId, bundleName: com.example.filereceiver, abilityName: FileReceiverServiceAbility }; this.remoteConnection { onAbilityConnectDone: this.onConnectDone.bind(this), onAbilityDisconnectDone: this.onDisconnectDone.bind(this) }; const context getContext(this) as common.UIAbilityContext; await context.connectAbility(want, this.remoteConnection); } // 發(fā)送文件數(shù)據(jù) async sendFile(fileContent: string): Promisevoid { if (!this.remoteConnection) { throw new Error(Remote connection not established); } const data { fileName: sample.txt, fileSize: fileContent.length, content: fileContent, timestamp: Date.now() }; await this.remoteConnection.sendRequest(1, data, {}); hilog.info(0x0000, testTag, File sent successfully); } // 讀取文件 async readFile(filePath: string): Promisestring { const file await fileIo.open(filePath, fileIo.OpenMode.READ_ONLY); try { const stat await fileIo.stat(filePath); const buffer new ArrayBuffer(stat.size); await fileIo.read(file.fd, buffer, { position: 0 }); return new TextDecoder().decode(buffer); } finally { await fileIo.close(file.fd); } } // 連接建立回調(diào) onConnectDone(elementName: common.ElementName, remote: common.RemoteProxy, resultCode: number): void { if (resultCode 0) { hilog.info(0x0000, testTag, Connected to receiver); } } // 連接斷開回調(diào) onDisconnectDone(elementName: common.ElementName, resultCode: number): void { hilog.info(0x0000, testTag, Disconnected from receiver); } }6.3 平板端實現(xiàn)接收方import { AbilityConstant, common, UIAbility } from kit.AbilityKit; import { BusinessError } from kit.BasicServicesKit; import { hilog } from kit.PerformanceAnalysisKit; import { fileIo } from kit.FileKit; export default class FileReceiverServiceAbility extends UIAbility { private connection: common.RemoteAbilityConnection | null null; onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void { hilog.info(0x0000, testTag, FileReceiverServiceAbility onCreate); this.connection { onAbilityConnectDone: this.onConnectDone.bind(this), onAbilityDisconnectDone: this.onDisconnectDone.bind(this) }; } onConnectDone(elementName: common.ElementName, remote: common.RemoteProxy, resultCode: number): void { if (resultCode 0) { hilog.info(0x0000, testTag, File sender connected); // 設(shè)置請求處理回調(diào) remote.setReceiveRequestCallback(this.handleFileRequest.bind(this)); } } onDisconnectDone(elementName: common.ElementName, resultCode: number): void { hilog.info(0x0000, testTag, File sender disconnected); } // 處理文件傳輸請求 async handleFileRequest(code: number, data: any, reply: common.MessageParcel, option: common.MessageOption): Promisevoid { if (code 1) { await this.saveFile(data); reply.writeInt(AbilityConstant.ResultCode.RESULT_OK); reply.writeString(File received successfully); } else { reply.writeInt(AbilityConstant.ResultCode.RESULT_CANCELED); } } // 保存接收到的文件 async saveFile(fileData: any): Promisevoid { const { fileName, content } fileData; const savePath /data/storage/el2/base/files/received/${fileName}; // 確保目錄存在 await fileIo.mkdir(/data/storage/el2/base/files/received, fileIo.Mode.IRWXU); // 寫入文件 const file await fileIo.open(savePath, fileIo.OpenMode.CREATE | fileIo.OpenMode.READ_WRITE); try { const buffer new TextEncoder().encode(content); await fileIo.write(file.fd, buffer); hilog.info(0x0000, testTag, File saved: ${savePath}); } finally { await fileIo.close(file.fd); } } }七、性能優(yōu)化與最佳實踐7.1 連接池管理對于需要頻繁跨設(shè)備調(diào)用的應(yīng)用建議使用連接池管理連接class ConnectionPool { private connections: Mapstring, common.RemoteAbilityConnection new Map(); private maxConnections: number 5; // 獲取連接 async getConnection(deviceId: string, bundleName: string, abilityName: string): Promisecommon.RemoteAbilityConnection { const key ${deviceId}_${bundleName}_${abilityName}; if (this.connections.has(key)) { return this.connections.get(key)!; } // 清理過期的連接 if (this.connections.size this.maxConnections) { this.cleanupIdleConnections(); } const connection await this.createConnection(deviceId, bundleName, abilityName); this.connections.set(key, connection); return connection; } // 創(chuàng)建新連接 private async createConnection(deviceId: string, bundleName: string, abilityName: string): Promisecommon.RemoteAbilityConnection { const want { deviceId, bundleName, abilityName }; const context getContext(this) as common.UIAbilityContext; return new Promise((resolve, reject) { const connection: common.RemoteAbilityConnection { onAbilityConnectDone: (elementName, remote, resultCode) { if (resultCode 0) { resolve(connection); } else { reject(new Error(Connection failed: ${resultCode})); } }, onAbilityDisconnectDone: () { this.connections.delete(${deviceId}_${bundleName}_${abilityName}); } }; context.connectAbility(want, connection); }); } // 清理空閑連接 private cleanupIdleConnections(): void { // 實現(xiàn)連接清理邏輯 } }7.2 錯誤處理與重試class CrossDeviceCallManager { private maxRetries: number 3; private retryDelay: number 1000; // 1秒 // 帶重試的跨設(shè)備調(diào)用 async startAbilityWithRetry(want: Want, maxRetries: number this.maxRetries): Promisevoid { for (let attempt 1; attempt maxRetries; attempt) { try { const context getContext(this) as common.UIAbilityContext; await context.startAbility(want); return; // 成功則返回 } catch (error) { if (attempt maxRetries) { throw error; // 最后一次嘗試仍然失敗 } // 指數(shù)退避延遲 const delay this.retryDelay * Math.pow(2, attempt - 1); await this.delay(delay); } } } // 延遲函數(shù) private delay(ms: number): Promisevoid { return new Promise(resolve setTimeout(resolve, ms)); } }7.3 權(quán)限檢查與申請import { abilityAccessCtrl } from kit.AbilityAccessCtrlKit; async function checkAndRequestPermissions(): Promiseboolean { try { const atManager abilityAccessCtrl.createAtManager(); // 檢查權(quán)限 const permissions [ ohos.permission.DISTRIBUTED_DATASYNC, ohos.permission.GET_DISTRIBUTED_DEVICE_INFO ]; const grantStatus await atManager.checkAccessToken(permissions); // 如果權(quán)限未授予請求權(quán)限 if (grantStatus.authList.some(item item.grantStatus abilityAccessCtrl.GrantStatus.PERMISSION_DENIED)) { await atManager.requestPermissionsFromUser(permissions); // 再次檢查權(quán)限 const newGrantStatus await atManager.checkAccessToken(permissions); return newGrantStatus.authList.every(item item.grantStatus abilityAccessCtrl.GrantStatus.PERMISSION_GRANTED); } return true; } catch (error) { console.error(Permission check failed:, error); return false; } }八、常見問題與解決方案8.1 設(shè)備發(fā)現(xiàn)失敗問題無法發(fā)現(xiàn)目標(biāo)設(shè)備。解決方案檢查設(shè)備是否在同一局域網(wǎng)確認(rèn)目標(biāo)設(shè)備已開啟分布式能力檢查設(shè)備發(fā)現(xiàn)權(quán)限是否已授予8.2 連接超時問題跨設(shè)備連接建立超時。解決方案增加連接超時時間實現(xiàn)重試機制檢查網(wǎng)絡(luò)狀況8.3 權(quán)限拒絕問題跨設(shè)備調(diào)用因權(quán)限不足失敗。解決方案在module.json5中聲明所需權(quán)限運行時動態(tài)請求用戶授權(quán)優(yōu)雅處理權(quán)限拒絕的情況8.4 數(shù)據(jù)序列化錯誤問題跨設(shè)備傳輸?shù)臄?shù)據(jù)無法正確序列化。解決方案確保傳輸?shù)臄?shù)據(jù)是可序列化的JSON對象避免傳輸循環(huán)引用的對象對于復(fù)雜對象使用自定義序列化方法總結(jié)跨設(shè)備調(diào)用是HarmonyOS分布式能力的核心它打破了設(shè)備間的物理邊界讓應(yīng)用能力可以在多設(shè)備間自由流轉(zhuǎn)。通過本文的學(xué)習(xí)你應(yīng)該掌握了核心要點回顧Want與WantAgent跨設(shè)備調(diào)用的核心數(shù)據(jù)結(jié)構(gòu)和執(zhí)行器隱式與顯式啟動兩種啟動遠(yuǎn)程Ability的方式連接模式建立長連接進(jìn)行持續(xù)通信錯誤處理與重試保證跨設(shè)備調(diào)用的可靠性最佳實踐合理使用連接池管理跨設(shè)備連接實現(xiàn)完善的錯誤處理和重試機制在適當(dāng)?shù)臅r機清理連接資源遵循最小權(quán)限原則申請權(quán)限跨設(shè)備調(diào)用技術(shù)的正確運用將為你的HarmonyOS應(yīng)用帶來真正的分布式體驗讓用戶在不同設(shè)備間無縫切換享受一致的應(yīng)用服務(wù)。