[英]Inject classes into workmanager with dagger2 (java)
问题是我不能用 java 将带有 dagger2 的类注入到工人(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!
是的 - 这是我的问题WorkManager Java Android Dagger2的重复,但它被版主关闭,我没有时间回答它。 我真的想为其他人节省一些时间。 附: 请 - 不要删除它。
对于像我这样的人来说,答案是:
这是 Worker 类:
import android.content.Context;
import android.support.annotation.NonNull;
import android.util.Log;
import androidx.work.ListenableWorker;
import androidx.work.WorkerParameters;
import javax.inject.Inject;
import javax.inject.Provider;
import com.sampleapp.model.Model;
public class SimpleWorker extends androidx.work.Worker {
//dagger (what we want to Inject into worker) U CAN ADD WHATEVER NEEDED
private Model model;
//not dagger (just some fields)
private String someField;
private final String TAG = getClass().getSimpleName();
private SimpleWorker(@NonNull Context context,
@NonNull WorkerParameters workerParams,
Model model) {
super(context, workerParams);
this.model = model;
someField = "just some work";
}
@NonNull
@Override
public ListenableWorker.Result doWork() {
Log.d(TAG, "Worker starts");
Log.d(TAG, model.getClass().getSimpleName() + " doing some work");
Log.d(TAG, "Job done!");
return ListenableWorker.Result.success();
}
public static class Factory implements ChildWorkerFactory {
private final Provider<Model> modelProvider;
@Inject
public Factory(Provider<Model> modelProvider) {
this.modelProvider = modelProvider;
}
@Override
public ListenableWorker create(Context context, WorkerParameters workerParameters) {
return new SimpleWorker(context,
workerParameters,
modelProvider.get());
}
}
}
界面为:
public interface ChildWorkerFactory {
ListenableWorker create(Context appContext, WorkerParameters workerParameters);
}
工人工厂:
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);
}
}
集合实用程序:
/**
*
* @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;
}
工人绑定:
import dagger.Binds;
import dagger.Module;
import dagger.multibindings.IntoMap;
@Module
public interface WorkerBindingModule {
@Binds
@IntoMap
@WorkerKey(SimpleWorker.class)
ChildWorkerFactory bindHelloWorldWorker(SimpleWorker.Factory factory);
}
WorkerKey 注释:
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();
}
部分应用类:
private static AppComponent component;
private void configureWorkManager() {
UpdaterWorkerFactory factory = component.factory();
Configuration config = new Configuration.Builder()
.setWorkerFactory(factory)
.build();
WorkManager.initialize(this, config);
}
AppComponent 接口的一部分:
@Singleton
@Component(modules = {AppModule.class, WorkerBindingModule.class})
public interface AppComponent {
// Some other injects here
SimpleWorkerFactory factory();
}
和清单的一部分(在应用程序内):
<provider
android:name="androidx.work.impl.WorkManagerInitializer"
android:authorities="${applicationId}.workmanager-init"
android:exported="false"
tools:node="remove"/>
gradle 中有什么:
// (Java only)
implementation ("android.arch.work:work-runtime:1.0.1")
附: 如果它会与 firebase 发生一些冲突
api 'com.google.guava:guava:27.1-android'
注意:在我的例子中,Model 被注入了 throw 接口。 喜欢:
public class ModelImplementation implements Model {
private ModelImplementation() {
App.getComponent().inject(this);
}
}
在同一个 AppComponent 中!
要使用这个惊人的功能,只需使用类似的东西(例如在 Activity 中):
PeriodicWorkRequest periodicWorkRequest = new PeriodicWorkRequest.Builder(SimpleWorker.class,
Const.WORKER_PERIOD, TimeUnit.MINUTES).build();
WorkManager.getInstance().enqueue(periodicWorkRequest);
pps。 Const.WORKER_PERIOD - 以分钟为单位的时间段(分钟 15)
targetSDK 为 27
Artem Winokurov 的回答非常好。
我需要在 BaseApp 类中更改什么
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);
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.