Question

问题在于我无法使用Java将带有dagger2的类注入到worker（WorkManager）中。

我试图在这里理解它的解释：https://proandroiddev.com/dagger-2-setup-with-workmanager-a-complete-step-by-step-guild-bb9f474bde37 而且我不知道为什么-但就我而言，这是行不通的。

public class SimpleWorker extends androidx.work.Worker {

private String TAG = "SimpleWorker";

SomeModel someModel; // this is injected model

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

@NonNull
@Override
public Result doWork() {
    Log.d(TAG, someModel.toString()); // but here always null
    return Result.success(); }
}

我希望它运行良好！

是-这是我的问题WorkManager Java Android Dagger2的重复但是它被主持人关闭了，我没有时间回答。我真的很想为其他人节省时间。 ps。请-不要删除它。

Answer 1

Artem Winokurov的回答很好。

我需要在BaseApp类中进行哪些更改

public class BaseApp implements HasAndroidInjector {

@Inject
SimpleWorkerFactory simpleWorkerFactory;


@Override
public void onCreate() {
    super.onCreate();

    AppInjector.init(this);

    configureWorkManager();
}


private void configureWorkManager() {

    Configuration config = new Configuration.Builder()
            .setWorkerFactory(simpleWorkerFactory)
            .build();

    WorkManager.initialize(this, config);
}

Answer 2

有像我这样的人的答案：

这里是Worker类：

public interface ChildWorkerFactory {
ListenableWorker create(Context appContext, WorkerParameters workerParameters);
}

接口是：

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

import java.util.Map;

import javax.inject.Inject;
import javax.inject.Provider;

import androidx.work.ListenableWorker;
import androidx.work.WorkerFactory;
import androidx.work.WorkerParameters;

import com.sampleapp.model.Model;
import com.sampleapp.model.CollectionsUtil;
public class SimpleWorkerFactory extends WorkerFactory {

private final Map<Class<? extends ListenableWorker>, Provider<ChildWorkerFactory>> workersFactories;

@Inject
public SimpleWorkerFactory(Map<Class<? extends ListenableWorker>, Provider<ChildWorkerFactory>> workersFactories) {
    this.workersFactories = workersFactories;
}

@Nullable
@Override
public ListenableWorker createWorker(@NonNull Context appContext, @NonNull String workerClassName, @NonNull WorkerParameters workerParameters) {
    Provider<ChildWorkerFactory> factoryProvider = CollectionsUtil.getWorkerFactoryProviderByKey(workersFactories, workerClassName);
    return factoryProvider.get().create(appContext, workerParameters);
}
}

WorkerFactory：

/**
 *
 * @param map workers
 * @param key workers name (class name)
 * @return
 */
public static Provider<ChildWorkerFactory> getWorkerFactoryProviderByKey(Map<Class<? extends ListenableWorker>, Provider<ChildWorkerFactory>> map, String key) {
    for (Map.Entry<Class<? extends ListenableWorker>, Provider<ChildWorkerFactory>> entry : map.entrySet()) {
        if (Objects.equals(key, entry.getKey().getName())) {
            return entry.getValue();
        }
    }
    return null;
}

CollectionUtils：

import dagger.Binds;
import dagger.Module;
import dagger.multibindings.IntoMap;

@Module
public interface WorkerBindingModule {
    @Binds
    @IntoMap
    @WorkerKey(SimpleWorker.class)
    ChildWorkerFactory bindHelloWorldWorker(SimpleWorker.Factory factory);
}

工作人员绑定：

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import androidx.work.ListenableWorker;
import dagger.MapKey;

@MapKey
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface WorkerKey {
    Class<? extends ListenableWorker> value();
}

WorkerKey批注：

private static AppComponent component;

private void configureWorkManager() {
    UpdaterWorkerFactory factory = component.factory();
    Configuration config = new Configuration.Builder()
            .setWorkerFactory(factory)
            .build();

    WorkManager.initialize(this, config);
}

Application类的一部分：

@Singleton
@Component(modules = {AppModule.class, WorkerBindingModule.class})
public interface AppComponent {
    // Some other injects here
    SimpleWorkerFactory factory();
}

AppComponent界面的一部分：

<provider
        android:name="androidx.work.impl.WorkManagerInitializer"
        android:authorities="${applicationId}.workmanager-init"
        android:exported="false"
        tools:node="remove"/>

清单的一部分（在应用程序内部）：

// (Java only)
implementation ("android.arch.work:work-runtime:1.0.1")

gradle中的内容是什么

api 'com.google.guava:guava:27.1-android'

ps。如果它会与firebase发生冲突

public class ModelImplementation implements Model {
private ModelImplementation() {
    App.getComponent().inject(this);
}
}

注意：在我的情况下，模型被注入抛出接口。喜欢：

PeriodicWorkRequest periodicWorkRequest = new PeriodicWorkRequest.Builder(SimpleWorker.class, 
Const.WORKER_PERIOD, TimeUnit.MINUTES).build();
    WorkManager.getInstance().enqueue(periodicWorkRequest);

在同一个AppComponent中！

要使用此惊人功能，只需使用类似（例如在Activity中）：

{{1}}

pps。 Const.WORKER_PERIOD-以分钟为单位的时间（至少15分钟）

targetSDK是27

使用dagger2将类注入Workmanager（Java）

2 个答案: