HarmonyOS 长时任务刷新问题？

Question

在使用数据传输的长时任务时，看文档需要刷新进度，目前使用notificationManager，任务实际进度变了但是UI没变，是否有刷新长时任务进度的示例。

Answer 1

参考示例如下：

// Datatransfer.ets文件
import wantAgent, { WantAgent } from '@ohos.app.ability.wantAgent';
import backgroundTaskManager from '@ohos.resourceschedule.backgroundTaskManager';
import { BusinessError } from '@ohos.base';
import router from '@ohos.router';
import http from '@ohos.net.http';
import { notificationManager } from '@kit.NotificationKit';

const TAG = "[DATA_TRANSFER_PAGE]"

const START_DATA_TRANSFER_BGMODE = 1
const STOP_DATA_TRANSFER_BGMODE = 2
const START_LOCATING1 = 3;
const STOP_LOCATING1 = 4;
const START_LOCATING2 = 5;
const STOP_LOCATING2 = 6;


@Entry
@Component
struct Datatransfer {
  @State message: string = '下载测试'
  private context: Context = getContext(this)
  private info: backgroundTaskManager.ContinuousTaskNotification = {
    slotType: 0,
    contentType: 0,
    notificationId: 0
  };
  private numlist: number[] = [10, 90]
  private index: number = 0

  callback(err: BusinessError, data: void) {
    if (err) {
      // hilog.error(CommonConstant.DOMAIN, CommonConstant.TAG, "Operation failed")
    } else {
      // hilog.info(CommonConstant.DOMAIN, CommonConstant.TAG, "Operation succeed");
    }
  }

  Http_request_custom() {
    let httpRequest = http.createHttp();
    try {
      httpRequest.on("dataReceive", (data: ArrayBuffer) => {
        console.info("Rcv data");
      });
      httpRequest.requestInStream("资源地址",
        {
          readTimeout: 0,
          connectTimeout: 0,
        }).then((data: number) => {
        console.log("lpf request2 OK! RespondCode is " + data);
        httpRequest.off("dataReceive")
        httpRequest.destroy()
      }).catch((err: BusinessError) => {
        console.log("lpf request2 ERROR : " + JSON.stringify(err));
      });
    } catch (error) {
      console.log("lpf request2 catch ERROR : " + JSON.stringify(error));
      console.log('ccj: 下载大文件异常捕获')
    }
  }

  startContinuousTask() {
    let wantAgentInfo: wantAgent.WantAgentInfo = {
      // 点击通知后，将要执行的动作列表
      // 添加需要被拉起应用的bundleName和abilityName
      wants: [
        {
          bundleName: 'com.example.myapplication',
          abilityName: "DataTransferAbility",
        }
      ],
      // 指定点击通知栏消息后的动作是拉起ability
      operationType: wantAgent.OperationType.START_ABILITY,
      // 使用者自定义的一个私有值
      requestCode: 0,
      // 点击通知后，动作执行属性
      wantAgentFlags: [wantAgent.WantAgentFlags.UPDATE_PRESENT_FLAG]
    };
    wantAgent.getWantAgent(wantAgentInfo).then((wantAgentObj: WantAgent) => {
      let list: Array<string> = [
        "dataTransfer"
      ];
      backgroundTaskManager.startBackgroundRunning(this.context, list, wantAgentObj)
        .then((res: backgroundTaskManager.ContinuousTaskNotification) => {
          console.info(`Succeeded in operationing startBackgroundRunning. id = ` + res.notificationId);
          this.info = res
        })
        .catch((err: BusinessError) => {
          console.error(`Failed to operation startBackgroundRunning. Code is ${err.code}, message is ${err.message}`);
        });
    });
  }

  stopContinuousTask() {
    // hilog.info(CommonConstant.DOMAIN, CommonConstant.TAG, 'stopBackgroundRunning begin');
    backgroundTaskManager.stopBackgroundRunning(this.context)
  }

  updateProcess(process: Number) {
    let downLoadTemplate: notificationManager.NotificationTemplate = {
      name: 'downloadTemplate', // 当前只支持downloadTemplate，后续根据需要支持录音
      data: {
        title: '文件下载：music.mp4', // 必填
        fileName: 'senTemplate', // 必填
        progressValue: process,
      }
    };
    let request: notificationManager.NotificationRequest = {
      content: {
        notificationContentType: notificationManager.ContentType.NOTIFICATION_CONTENT_SYSTEM_LIVE_VIEW,
        systemLiveView: {
          typeCode: 8,
          title: "111",
          text: "111",
        }
      },
      id: this.info.notificationId,
      notificationSlotType: notificationManager.SlotType.LIVE_VIEW,
      template: downLoadTemplate
    };

    try {
      notificationManager.publish(request).then(() => {
        console.info("publish success, id= " + this.info.notificationId);
      }).catch((err: BusinessError) => {
        console.error(`publish fail: ${JSON.stringify(err)}`);
      });
    } catch (err) {
      console.error(`publish fail: ${JSON.stringify(err)}`);
    }
  }

  build() {
    Row() {
      Column() {
        // back
        Column() {
          Image($r('app.media.startIcon'))
            .width(100)
            .height(200)
            .margin(50)
            .onClick(() => {
              router.back();
            })
        }
        .width("100%")
        .height(250)
        .justifyContent(FlexAlign.Center)
        .alignItems(HorizontalAlign.Start)

        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)

        Button() {
          Text('申请长时任务').fontSize(25).fontWeight(FontWeight.Bold)
        }
        .type(ButtonType.Capsule)
        .margin({ top: 10 })
        .backgroundColor('#0D9FFB')
        .width(250)
        .height(40)
        .onClick(() => {
          console.log('tag: 长时任务')
          this.startContinuousTask();
        })

        Button() {
          Text('下载大文件').fontSize(25).fontWeight(FontWeight.Bold)
        }
        .type(ButtonType.Capsule)
        .margin({ top: 10 })
        .backgroundColor('#0D9FFB')
        .width(250)
        .height(40)
        .onClick(() => {
          console.log('tag: 下载大文件')
          this.Http_request_custom();
        })

        Button() {
          Text('取消长时任务').fontSize(25).fontWeight(FontWeight.Bold)
        }
        .type(ButtonType.Capsule)
        .margin({ top: 10 })
        .backgroundColor('#0D9FFB')
        .width(250)
        .height(40)
        .onClick(() => {
          console.log('tag: 取消长时任务')
          this.stopContinuousTask();
        })

        Button() {
          Text('更新进度').fontSize(25).fontWeight(FontWeight.Bold)
        }
        .type(ButtonType.Capsule)
        .margin({ top: 10 })
        .backgroundColor('#0D9FFB')
        .width(250)
        .height(40)
        .onClick(() => {
          console.log('tag: 更新进度')
          this.updateProcess(this.numlist[this.index % this.numlist.length]);
          this.index++;
        })
      }
      .width('100%')
    }
    .height('100%')
  }
}

module.json5文件配置

{
  "module": {
    "name": "entry",
    "type": "entry",
    "description": "$string:module_desc",
    "mainElement": "EntryAbility",
    "deviceTypes": [
      "phone",
      "tablet",
      "2in1"
    ],
    "deliveryWithInstall": true,
    "installationFree": false,
    "pages": "$profile:main_pages",
    "requestPermissions":[
      {
        "name": "ohos.permission.CAMERA",
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.MICROPHONE",
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.MEDIA_LOCATION",
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.WRITE_MEDIA",
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.READ_MEDIA",
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {"name": 'ohos.permission.READ_CALENDAR',
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {"name": 'ohos.permission.WRITE_CALENDAR',
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.APPROXIMATELY_LOCATION", // 允许应用获取设备模糊位置信息，此权限必须放在前面，否则可能会有问题
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.LOCATION", // 允许应用获取设备位置信息
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.INTERNET"
      },

      {
        "name": "ohos.permission.GET_NETWORK_INFO"
      },
      {
        "name": "ohos.permission.PUBLISH_AGENT_REMINDER"
      },
      {
        "name" : "ohos.permission.READ_AUDIO",
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.USE_BLUETOOTH"
      },
      {
        "name" : "ohos.permission.LOCATION_IN_BACKGROUND",
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      },
      {
        "name": "ohos.permission.KEEP_BACKGROUND_RUNNING"
      },
      {
        "name" : "ohos.permission.WRITE_AUDIO",
        "reason": "$string:EntryAbility_desc",
        "usedScene": {
          "abilities": [
            "EntryAbility"
          ],
          "when":"always"
        }
      }
    ],
    "abilities": [
      {
        "name": "EntryAbility",
        "srcEntry": "./ets/entryability/EntryAbility.ets",
        "description": "$string:EntryAbility_desc",
        "icon": "$media:app_icon",
        "label": "$string:EntryAbility_label",
        "startWindowIcon": "$media:startIcon",
        "startWindowBackground": "$color:start_window_background",
        "exported": true,
        "backgroundModes": [
          "audioPlayback",
          "location",
          "dataTransfer",
          "audioRecording"
        ],
        "skills": [
          {
            "entities": [
              "entity.system.home"
            ],
            "actions": [
              "action.system.home"
            ]
          },
          {
            "uris": [
              {
                "scheme": "yymobile"
              }
            ]
          }
        ],
        "orientation": "auto_rotation"
      }
    ]
  }
}