我是使用RxAndroid和RxJava的新手。我正在使用RxJava + Retrofit2来发出GET请求。我使用以下代码执行大约1500 GET请求并获得内存不足错误。不过相同的代码这次只有改装，没有RxAndroid，它的工作原理。所以我的结论是我在RxAndroid中做错了什么。你能帮我解决一下我缺少的东西吗？
代码示例：
Subject<Story> mStoryEmitter = PublishSubject.create();
private void getStory(int storyID) {
HNApi.Factory.getInstance().getStory(storyID).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(getStoryObserver());
}
mStoryListEmitter.subscribe(new Observer<List<Integer>>() {
@Override
public void onSubscribe(Disposable d) {}
@Override
public void onNext(List<Integer> value) {
if(mRecyclerView != null) {
mRecyclerView.setAdapter(null);
if(mAdapter != null) {
mAdapter.clear();
mAdapter = null;
}
}
mAdapter = new SimpleRecyclerViewAdapter();
mRecyclerView.setAdapter(mAdapter);
for(Integer storyID : value) {
getStory(storyID);
}
}
@Override
public void onError(Throwable e) {}
@Override
public void onComplete() {}
});
private DisposableObserver<Story> getStoryObserver() {
DisposableObserver<Story> observer = new DisposableObserver<Story>() {
@Override
public void onNext(Story value) {
mStoryEmitter.onNext(value);
dispose();
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
};
return observer;
}
错误：
Throwing OutOfMemoryError "Could not allocate JNI Env"
java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.
at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:111)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.OutOfMemoryError: Could not allocate JNI Env
at java.lang.Thread.nativeCreate(Native Method)
at java.lang.Thread.start(Thread.java:1063)
at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:921)
at java.util.concurrent.ThreadPoolExecutor.ensurePrestart(ThreadPoolExecutor.java:1556)
at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:310)
at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:543)
at java.util.concurrent.ScheduledThreadPoolExecutor.submit(ScheduledThreadPoolExecutor.java:642)
at io.reactivex.internal.schedulers.NewThreadWorker.scheduleActual(NewThreadWorker.java:120)
at io.reactivex.internal.schedulers.IoScheduler$EventLoopWorker.schedule(IoScheduler.java:221)
at io.reactivex.Scheduler.scheduleDirect(Scheduler.java:130)
at io.reactivex.Scheduler.scheduleDirect(Scheduler.java:109)
AppData::create pipe(2) failed: Too many open files
at io.reactivex.internal.operators.observable.ObservableSubscribeOn.subscribeActual(ObservableSubscribeOn.java:36)
at io.reactivex.Observable.subscribe(Observable.java:10514)
at io.reactivex.internal.operators.observable.ObservableObserveOn.subscribeActual(ObservableObserveOn.java:44)
at io.reactivex.Observable.subscribe(Observable.java:10514)
at com.example.MainActivity.getStory(MainActivity.java:100)
at com.example.MainActivity.access$300(MainActivity.java:25)
at com.example.MainActivity$2.onNext(MainActivity.java:67)
at com.example.MainActivity$2.onNext(MainActivity.java:49)
at io.reactivex.subjects.PublishSubject$PublishDisposable.onNext(PublishSubject.java:263)
at io.reactivex.subjects.PublishSubject.onNext(PublishSubject.java:182)
at com.example.MainActivity$5.onNext(MainActivity.java:147)
at com.example.MainActivity$5.onNext(MainActivity.java:138)
at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.drainNormal(ObservableObserveOn.java:198)
at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.run(ObservableObserveOn.java:250)
at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:109)
... 7 more
AppData::create pipe(2) failed: Too many open files
FATAL EXCEPTION: main
Process: com.example, PID: 15857
java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.
at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:111)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.OutOfMemoryError: Could not allocate JNI Env
at java.lang.Thread.nativeCreate(Native Method)
at java.lang.Thread.start(Thread.java:1063)
at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:921)
at java.util.concurrent.ThreadPoolExecutor.ensurePrestart(ThreadPoolExecutor.java:1556)
at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:310)
at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:543)
at java.util.concurrent.ScheduledThreadPoolExecutor.submit(ScheduledThreadPoolExecutor.java:642)
at io.reactivex.internal.schedulers.NewThreadWorker.scheduleActual(NewThreadWorker.java:120)
at io.reactivex.internal.schedulers.IoScheduler$EventLoopWorker.schedule(IoScheduler.java:221)
at io.reactivex.Scheduler.scheduleDirect(Scheduler.java:130)
at io.reactivex.Scheduler.scheduleDirect(Scheduler.java:109)
at io.reactivex.internal.operators.observable.ObservableSubscribeOn.subscribeActual(ObservableSubscribeOn.java:36)
at io.reactivex.Observable.subscribe(Observable.java:10514)
at io.reactivex.internal.operators.observable.ObservableObserveOn.subscribeActual(ObservableObserveOn.java:44)
at io.reactivex.Observable.subscribe(Observable.java:10514)
at com.example.MainActivity.getStory(MainActivity.java:100)
at com.example.MainActivity.access$300(MainActivity.java:25)
at com.example.MainActivity$2.onNext(MainActivity.java:67)
at com.example.MainActivity$2.onNext(MainActivity.java:49)
at io.reactivex.subjects.PublishSubject$PublishDisposable.onNext(PublishSubject.java:263)
at io.reactivex.subjects.PublishSubject.onNext(PublishSubject.java:182)
at com.example.MainActivity$5.onNext(MainActivity.java:147)
at com.example.MainActivity$5.onNext(MainActivity.java:138)
at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.drainNormal(ObservableObserveOn.java:198)
at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.run(ObservableObserveOn.java:250)
at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:109)
... 7 more
答案 0 :(得分：7)
在RxAndroid github发表了同样的问题。
JakeWharton的回答实际上是加速的
问题是Schedulers.io（）使用没有限制的缓存线程池，因此尝试创建1500个线程。您应该考虑使用具有固定线程限制的调度程序，或使用RxJava 2.x的parallel（）运算符将操作并行化为固定数量的worker。
如果您默认使用原始Retrofit，它会使用OkHttp的调度程序将线程限制为64（每个主机最多5个）。这就是为什么你没有看到它失败。
如果在创建RxJava2CallAdapterFactory时使用createAsync（），它将创建完全异步的Observable实例，这些实例不需要subscribeOn，并且使用OkHttp的Dispatcher，就像Retrofit一样。然后你只需要observeOn回到主线程，你就可以避免所有额外的线程创建。
答案 1 :(得分：0)
为每个周期将Disposables添加到CompositeDisposable和dispose
CompositeDisposable disposable = new CompositeDisposable();
mStoryListEmitter.subscribe(new Observer<List<Integer>>() {
@Override
public void onSubscribe(Disposable d) {
disposable.add(d); // adding disposable
}
@Override
public void onNext(List<Integer> value) {
if(mRecyclerView != null) {
mRecyclerView.setAdapter(null);
if(mAdapter != null) {
mAdapter.clear();
mAdapter = null;
}
}
mAdapter = new SimpleRecyclerViewAdapter();
mRecyclerView.setAdapter(mAdapter);
for(Integer storyID : value) {
getStory(storyID);
}
}
@Override
public void onError(Throwable e) {}
@Override
public void onComplete() {
diposable.dispose(); // <--- Disposing on complete
}
})