Android Work Manager:“无法实例化Worker" [英] Android Work Manager: "Could not instantiate Worker"

问题描述

我已按照 Android开发人员的教程进行操作工人管理器结构在后台运行我的代码，但是每当我尝试使我的工人入队时，它都不会运行，并且会出现以下错误:

I've followed the Android Developer's tutorial on using the Worker Manager structure to run my code in background but anytime I try to enqueue my worker it doesn't run and I get the following error:

2018-10-04 22:25:47.004 28669-28885/app.package.com.debug E/DefaultWorkerFactory: Could not instantiate app.package.com.MyWorker
    java.lang.NoSuchMethodException: <init> []
        at java.lang.Class.getConstructor0(Class.java:2320)
        at java.lang.Class.getDeclaredConstructor(Class.java:2166)
        at androidx.work.DefaultWorkerFactory.createWorker(DefaultWorkerFactory.java:58)
        at androidx.work.impl.WorkerWrapper.runWorker(WorkerWrapper.java:180)
        at androidx.work.impl.WorkerWrapper.run(WorkerWrapper.java:117)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
        at java.lang.Thread.run(Thread.java:764)
2018-10-04 22:25:47.005 28669-28885/app.package.com.debug E/WorkerWrapper: Could for create Worker app.package.com.MyWorker

我已经看到此问题可能与工作程序上的默认构造函数有关，但我已经使用了正确的函数而不是不推荐使用的默认函数.

I've seen that this problem could be related to the default constructor on the worker but I already use the correct one instead of the deprecated default function.

我的工人被宣布为:

public class MyWorker extends Worker {

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

    @NonNull
    @Override
    public Result doWork() {
        // Doesn't even get called
    }
}

它像这样排队:

WorkManager workManager = WorkManager.getInstance();
if (myWorkerRequest == null) {
    myWorkerRequest = new OneTimeWorkRequest.Builder(MyWorker.class)
            .setConstraints(new Constraints.Builder()
                    .setRequiredNetworkType(NetworkType.CONNECTED)
                    .build())
            .build();
}
WorkStatus workStatus = workManager.getStatusById(myWorkerRequest.getId()).getValue();
if (workStatus == null || !workStatus.getState().isFinished()) {
    workManager.enqueue(myWorkerRequest);
}

我没有看到与示例不同的内容，因此我想了解还有什么可能影响我的代码导致此崩溃.可能与ProGuard有关吗?

I'm not seeing anything different from the examples so I'd like to understand what else could affect my code to cause this crash. Could it be something ProGuard related?

我的版本是1.0.0-alpha09

谢谢！

推荐答案

这是已知问题使用已经标记为已固定为alpha10的WorkManager 1.0.0-alpha09.

This is a known issue with WorkManager 1.0.0-alpha09 that is already marked as fixed for alpha10.

作为一种解决方法，您可以将以下行添加到您的proguard配置中:

As a workaround, you can add the following lines to your proguard configuration:

-keepclassmembers class * extends androidx.work.Worker {
    public <init>(android.content.Context,androidx.work.WorkerParameters);
}

这篇关于Android Work Manager:“无法实例化Worker"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！