1.在module.json5中 "requestPermissions": [ {"name": "ohos.permission.INTERNET"}, {"name": "ohos.permission.GET_BUNDLE_INFO"}, {"name": "ohos.permission.KEEP_BACKGROUND_RUNNING"} ], "pages": "$profile:main_pages", "abilities": [ { "name": "EntryAbility", "backgroundModes": [ "dataTransfer" // 对应 BackgroundMode.DATA_TRANSFER ], 2.在EntryAblility中 async onForeground(): Promise<void> { // Ability has brought to foreground hilog.info(DOMAIN, 'testTag', '%{public}s', 'Ability onForeground'); try { const wantAgentInfo: wantAgent.WantAgentInfo = { wants: [{ bundleName: 'com.ht.cotton', abilityName: 'EntryAbility' }], actionType: wantAgent.OperationType.START_ABILITY, requestCode: 0, actionFlags: [wantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG] }; const wantAgentObj = await wantAgent.getWantAgent(wantAgentInfo); const taskTypes = ['dataTransfer']; // 或 ['audioPlayback'], ['audioRecording'] 等 const res = await backgroundTaskManager.startBackgroundRunning(this.context, backgroundTaskManager.BackgroundMode.DATA_TRANSFER, wantAgentObj); // console.info('后台长时任务已申请, notificationId:', res.notificationId); } catch (e) { console.error('申请后台长时任务失败:', JSON.stringify(e)); } }