我尝试使用WorkManager实现计时器。
“定时器按钮被击中”是出现在日志猫，但没有任何来自工人。我做错了什么？
这是我的viewmodel类：

public class MainViewModel extends ViewModel {

    public static final String LOG_TAG = "MainActivity";
    private final WorkManager workManager;

    public MainViewModel(WorkManager workManager) {
        this.workManager = workManager;
    }

    public void count() {
        Log.d(LOG_TAG, "Timer button was hit!");

        OneTimeWorkRequest request = new OneTimeWorkRequest.Builder(MainWorker.class).build();
        workManager.beginUniqueWork("count-work", ExistingWorkPolicy.APPEND, request).enqueue();
    }
}

这是我的工人。从这里看logcat里什么都没有。我不知道为什么。

public class MainWorker extends Worker {

    public MainWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
        super(context, workerParams);
        Log.d(MainViewModel.LOG_TAG, "Created");
    }

    @NonNull
    @Override
    public Result doWork() {
        Log.d(MainViewModel.LOG_TAG, "Work start");
        return Result.success();
    }
}

这是我的活动：

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        MainViewModel viewModel = new MainViewModel(WorkManager.getInstance(this));
        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        binding.setMainViewModel(viewModel);
    }
}