无法示例化工作进程

ql3eal8s  于 2021-08-20  发布在  Java
关注(0)|答案(1)|浏览(331)

我正在制作一个通过蓝牙与pc通信的应用程序。现在我正在开发一个名为bluetoothcommworker的工人类,它包含在我的connect pc名为connectedpc的类中。我创建了worker并根据android文档将其排队。但是,当我尝试将其排队时,会得到输出和错误:

W/WM-WorkSpec: Interval duration lesser than minimum allowed value; Changed to 900000
E/WM-WorkerFactory: Could not instantiate com.example.app.ConnectedPC$BluetoothCommWorker
    java.lang.NoSuchMethodException: com.example.app.ConnectedPC$BluetoothCommWorker.<init> [class android.content.Context, class androidx.work.WorkerParameters]
        at java.lang.Class.getConstructor0(Class.java:2332)
        at java.lang.Class.getDeclaredConstructor(Class.java:2170)
        at androidx.work.WorkerFactory.createWorkerWithDefaultFallback(WorkerFactory.java:95)
        at androidx.work.impl.WorkerWrapper.runWorker(WorkerWrapper.java:244)
        at androidx.work.impl.WorkerWrapper.run(WorkerWrapper.java:136)
        at androidx.work.impl.utils.SerialExecutor$Task.run(SerialExecutor.java:91)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:923)
E/WM-WorkerWrapper: Could not create Worker com.example.app.ConnectedPC$BluetoothCommWorker

这是我的密码:

package com.example.app;

import android.bluetooth.BluetoothDevice;
import android.content.Context;
import android.os.SystemClock;

import androidx.annotation.NonNull;
import androidx.work.Constraints;
import androidx.work.Data;
import androidx.work.PeriodicWorkRequest;
import androidx.work.WorkManager;
import androidx.work.Worker;
import androidx.work.WorkerParameters;

import java.util.concurrent.TimeUnit;

public class ConnectedPC {
    private final BluetoothDevice BLUETOOTH_DEVICE;
    private boolean isActivePC;
    private PeriodicWorkRequest periodicWorkRequest;

    public ConnectedPC(BluetoothDevice bluetoothDevice) {
        this.BLUETOOTH_DEVICE = bluetoothDevice;
    }

    public String getName() {
        return BLUETOOTH_DEVICE.getName();
    }

    public boolean isActivePC() {
        return isActivePC;
    }

    public void setActivePC(boolean activeDevice) {
        isActivePC = activeDevice;
    }

    public String getAddress() {
        return BLUETOOTH_DEVICE.getAddress();
    }

    public void initWork(Context context) {
        Constraints constraints = new Constraints.Builder().build();

        periodicWorkRequest = new PeriodicWorkRequest.Builder(
                BluetoothCommWorker.class,
                5,
                TimeUnit.SECONDS
        ).setConstraints(constraints)
                .setInitialDelay(2, TimeUnit.SECONDS)
                .addTag(String.format("%s: BluetoothCommWorker", BLUETOOTH_DEVICE.getName()))
                .build();
        WorkManager.getInstance(context).enqueue(periodicWorkRequest);
    }

    public class BluetoothCommWorker extends Worker {

        public BluetoothCommWorker(@NonNull Context context,
                                   @NonNull WorkerParameters workerParams) {
            super(context, workerParams);
        }

        @NonNull
        @Override
        public Result doWork() {
            try {
                for (int i = 0; i < 10; i++) {
                    System.out.println(BLUETOOTH_DEVICE.getName() + ": " + i);
                    SystemClock.sleep(1000);
                }
            } catch (Exception e) {
                e.printStackTrace();
                return Result.failure();
            }

            return Result.retry();
        }
    }
}

dowork函数只包含一个伪for循环,因为我希望在实际处理工作代码之前先让工作代码工作。有什么解决办法吗?

jrcvhitl

jrcvhitl1#

周期性工作的最小间隔为15分钟(900秒,900000毫秒)-如错误输出中所示。您应按如下方式更换单位和金额:

periodicWorkRequest = new PeriodicWorkRequest.Builder(
            BluetoothCommWorker.class,
            15,
            TimeUnit.MINUTES
        )

如果您需要更短的时间间隔,还有其他方法:
https://developer.android.com/training/scheduling/alarms
编辑:有一些技巧可以使用一次性工作人员自己重新安排时间,以更短的时间间隔运行工作
如何缩短workmanager android的时间段?
此外,您可能应该考虑前台服务来通知用户,他们有一个进程运行的任务具有微小的间隔+一些手段来停止任务,即“停止”按钮或重定向到您的应用程序,用户可以在其中停止任务:
https://developer.android.com/guide/components/foreground-services

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