android-无法在WorkManager的Worker类中注入单例类

我正在研究MVVM体系结构,并且正在使用Dagger2进行数据注入.我面临的问题是,在Activity / Fragments中,@ Inject工作正常,但是在WorkManager的Worker类中,@ Inject在运行时给出空指针异常.我该如何解决？

以下是Worker类代码：

public class MySyncManager extends Worker {

    @Inject
    DataManager dataManager;

    @Inject
    SchedulerProvider schedulerProvider;

    @NonNull
    @Override
    public WorkerResult doWork() {

        CommonUtils.Log("usm_work_manager_1", "Work is Started.");
         if(dataManager==null) 
        CommonUtils.Log("usm_work_manager", "Injector is NULL");

    }
    }

方法：

    private void startTestSyncRequest() {
        Constraints myConstraints = new Constraints.Builder()
                .setRequiredNetworkType(NetworkType.CONNECTED)
                .build();
        OneTimeWorkRequest workRequest = new OneTimeWorkRequest.Builder(MySyncManager.class)
                .setConstraints(myConstraints)
                .setInitialDelay(1, TimeUnit.SECONDS)  // wait for n seconds before starting service
                .build();

        WorkManager.getInstance()
                .beginUniqueWork(Tags.TEST_WORK_NAME, ExistingWorkPolicy.REPLACE, workRequest)
                .enqueue();

}

解决方法:

在工人阶级中注入领域
首先,您需要将您的worker类注入AppComponent内：

 fun inject(syncItemWorker: SyncItemWorker)

然后在worker的doWork()中,您需要调用inject：

 if(applicationContext is MyApp){
        var daggerAppComponent= DaggerAppComponent.builder().application(applicationContext as MyApp).build()
        daggerAppComponent.inject(this)
    }

标签：dagger-2,dependency-injection,android-workmanager,android
来源： https://codeday.me/bug/20191025/1926401.html