我正在使用Retrofit2 + RxJava + RxAndroid进行网络呼叫。
我尝试过不同的Schedulers同样io()和newThread()。我知道使用newThread()的后果，但仍然应用程序正在关闭OOM的原因。
场景：
以上网络通话发生65次。
码：
/*form version download method*/
public void startFormDownload(List<Form> form, ApiClient apiClient) {
Observable.fromIterable(form)
.concatMapIterable(Form::getFormVersions) // get form version list from single form object
.doOnSubscribe(disposable -> AppLogger.i(tag, "Form Versions download is subscribed")) // subscribe process to rx
.filter(this::checkFormVersionToDownloadOrNot) // only get those versions who needed to downloaded
.doOnNext(formVersion -> { // get formVersion object
AppLogger.i(tag, "download this form ---------> " + formVersion.getFormUrl());
AppLogger.i(tag, formVersion.getFormUrl());
String constructURL = formVersion.getFormUrl();
/* download form gzip process starts from here */
apiClient.getJsonByFormURL(constructURL)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new SingleObserver<Response<ResponseBody>>() {
@Override
public void onSubscribe(Disposable disposable) {
AppLogger.i(tag, "gzip download ->" + "subscribed");
}
@Override
public void onSuccess(Response<ResponseBody> responseBodyResponse) {
AppLogger.i(tag, "gzip downloaded " + " success");
AppLogger.i(tag, "gzip downloaded ->" + responseBodyResponse.toString());
if (responseBodyResponse.code() == 401) {
//not authorized
return;
}
ByteArrayInputStream bais = null;
if (responseBodyResponse.body() != null)
try {
bais = new ByteArrayInputStream(responseBodyResponse.body().bytes());
GZIPInputStream gzis = new GZIPInputStream(bais);
InputStreamReader reader = new InputStreamReader(gzis);
BufferedReader in = new BufferedReader(reader);
String readed;
StringBuilder stringBuilder = new StringBuilder();
while ((readed = in.readLine()) != null) {
stringBuilder.append(readed);
}
baseRealm = Realm.getDefaultInstance();
formVersion.setJsonString(stringBuilder.toString());
baseRealm.executeTransaction(realm ->
baseRealm.copyToRealmOrUpdate(formVersion));
} catch (IOException e) {
AppLogger.e(tag, "gzip extract exception->" + e.getLocalizedMessage(), e);
}
}
@Override
public void onError(Throwable throwable) {
AppLogger.e(tag, "gzip failed->" + throwable.getMessage(), throwable);
}
});
})
.doOnTerminate(() -> AppLogger.i(tag, "Form Versions terminated"))
.doOnError(Throwable::printStackTrace)
.subscribe(
formVersion -> AppLogger.i(tag, "Form Versions download completed"),
throwable -> AppLogger.e(tag, throwable.getMessage(), throwable)
);
}
可能有InputStream导致OOM的情况，但我不知道在这里可以做些什么。
PS。 OOM有时只发生，而不是总是发生。
崩溃报告
java.lang.OutOfMemoryError: Could not allocate JNI Env
at java.lang.Thread.nativeCreate(Native Method)
at java.lang.Thread.start(Thread.java:730)
at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:941)
at java.util.concurrent.ThreadPoolExecutor.ensurePrestart(ThreadPoolExecutor.java:1582)
at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:313)
at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:550)
at java.util.concurrent.ScheduledThreadPoolExecutor.submit(ScheduledThreadPoolExecutor.java:651)
at io.reactivex.internal.schedulers.NewThreadWorker.scheduleActual(NewThreadWorker.java:146)
at io.reactivex.internal.schedulers.NewThreadWorker.schedule(NewThreadWorker.java:51)
at io.reactivex.Scheduler.scheduleDirect(Scheduler.java:135)
at io.reactivex.Scheduler.scheduleDirect(Scheduler.java:111)
at io.reactivex.internal.operators.single.SingleSubscribeOn.subscribeActual(SingleSubscribeOn.java:37)
at io.reactivex.Single.subscribe(Single.java:2779)
at io.reactivex.internal.operators.single.SingleObserveOn.subscribeActual(SingleObserveOn.java:35)
at io.reactivex.Single.subscribe(Single.java:2779)
at com.visualogyx.app.fragments.VisualogyxBaseFragment.lambda$startFormDownload$10$VisualogyxBaseFragment(VisualogyxBaseFragment.java:623)
at com.visualogyx.app.fragments.VisualogyxBaseFragment$$Lambda$9.accept(Unknown Source)
at io.reactivex.internal.operators.observable.ObservableDoOnEach$DoOnEachObserver.onNext(ObservableDoOnEach.java:95)
at io.reactivex.internal.operators.observable.ObservableFilter$FilterObserver.onNext(ObservableFilter.java:52)
at io.reactivex.internal.observers.DisposableLambdaObserver.onNext(DisposableLambdaObserver.java:58)
at io.reactivex.internal.operators.observable.ObservableFlattenIterable$FlattenIterableObserver.onNext(ObservableFlattenIterable.java:111)
at io.reactivex.internal.operators.observable.ObservableFromIterable$FromIterableDisposable.run(ObservableFromIterable.java:98)
at io.reactivex.internal.operators.observable.ObservableFromIterable.subscribeActual(ObservableFromIterable.java:58)
at io.reactivex.Observable.subscribe(Observable.java:10910)
at io.reactivex.internal.operators.observable.ObservableFlattenIterable.subscribeActual(ObservableFlattenIterable.java:44)
at io.reactivex.Observable.subscribe(Observable.java:10910)
at io.reactivex.internal.operators.observable.ObservableDoOnLifecycle.subscribeActual(ObservableDoOnLifecycle.java:33)
at io.reactivex.Observable.subscribe(Observable.java:10910)
at io.reactivex.internal.operators.observable.ObservableFilter.subscribeActual(ObservableFilter.java:30)
at io.reactivex.Observable.subscribe(Observable.java:10910)
at io.reactivex.internal.operators.observable.ObservableDoOnEach.subscribeActual(ObservableDoOnEach.java:42)
at io.reactivex.Observable.subscribe(Observable.java:10910)
at io.reactivex.internal.operators.observable.ObservableDoOnEach.subscribeActual(ObservableDoOnEach.java:42)
at io.reactivex.Observable.subscribe(Observable.java:10910)
at io.reactivex.internal.operators.observable.ObservableDoOnEach.subscribeActual(ObservableDoOnEach.java:42)
at io.reactivex.Observable.subscribe(Observable.java:10910)
at io.reactivex.Observable.subscribe(Observable.java:10896)
at io.reactivex.Observable.subscribe(Observable.java:10825)
at com.visualogyx.app.fragments.VisualogyxBaseFragment.startFormDownload(VisualogyxBaseFragment.java:683)
at com.visualogyx.app.fragments.VisualogyxBaseFragment.updateJobAndDownloadCheckListForm(VisualogyxBaseFragment.java:239)
at com.visualogyx.app.fragments.VisualogyxBaseFragment.lambda$null$1$VisualogyxBaseFragment(VisualogyxBaseFragment.java:221)
at com.visualogyx.app.fragments.VisualogyxBaseFragment$$Lambda$15.test(Unknown Source)
at io.reactivex.internal.operators.observable.ObservableAllSingle$AllObserver.onNext(ObservableAllSingle.java:69)
at io.reactivex.internal.operators.observable.ObservableFromIterable$FromIterableDisposable.run(ObservableFromIterable.java:98)
at io.reactivex.internal.operators.observable.ObservableFromIterable.subscribeActual(ObservableFromIterable.java:58)
at io.reactivex.Observable.subscribe(Observable.java:10910)
at io.reactivex.internal.operators.observable.ObservableAllSingle.subscribeActual(ObservableAllSingle.java:34)
at io.reactivex.Single.subscribe(Single.java:2779)
at io.reactivex.Single.subscribe(Single.java:2765)
at io.reactivex.Single.subscribe(Single.java:2686)
at com.visualogyx.app.fragments.VisualogyxBaseFragment.lambda$storeAndRetrieveListFromDB$2$VisualogyxBaseFragment(VisualogyxBaseFragment.java:226)
at com.visualogyx.app.fragments.VisualogyxBaseFragment$$Lambda$0.execute(Unknown Source)
at io.realm.Realm.executeTransaction(Realm.java:1394)
at com.visualogyx.app.fragments.VisualogyxBaseFragment.storeAndRetrieveListFromDB(VisualogyxBaseFragment.java:200)
at com.visualogyx.app.fragments.HomeFragment$1.onSuccess(HomeFragment.java:59)
at com.visualogyx.app.fragments.HomeFragment$1.onSuccess(HomeFragment.java:54)
at com.visualogyx.app.controller.ApiCallback.onResponse(ApiCallback.java:36)
at com.visualogyx.app.controller.ApiClient$11.onResponse(ApiClient.java:264)
at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:70)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:203)
at android.app.ActivityThread.main(ActivityThread.java:6293)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1065)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:926)
你可以使用bytestream而不是byte []
String body = null;
String charset = "UTF-8"; // You should determine it based on response header.
try (
InputStream gzippedResponse = responseBodyResponse.body().byteStream();
InputStream ungzippedResponse = new GZIPInputStream(gzippedResponse);
Reader reader = new InputStreamReader(ungzippedResponse, charset);
Writer writer = new StringWriter();
) {
char[] buffer = new char[10240];
for (int length = 0; (length = reader.read(buffer)) > 0;) {
writer.write(buffer, 0, length);
}
body = writer.toString();
}
也许您应该将日志添加到代码的不同部分并找出内存占用内存，哪一部分占用内存。或者你可以使用AndroidStuido内存分配工具来监控内存分配。
我不得不在doFinally()块中移动与事务相关的操作。到现在为止还挺好。
Observable.fromIterable(form)
.concatMapIterable(Form::getFormVersions) // get form version list from single form object
.doOnSubscribe(disposable -> AppLogger.i(tag, "Form Versions download is subscribed")) // subscribe process to rx
.filter(formVersion -> formVersion.getJsonString() == null) // only get those versions who is not downloaded yet
.doOnNext(formVersion -> { // get formVersion object
AppLogger.i(tag, "download this form ---------> " + formVersion.getFormUrl());
AppLogger.i(tag, formVersion.getFormUrl());
String constructURL = formVersion.getFormUrl();
/* download form gzip process starts from here */
apiClient.getJsonByFormURL(constructURL)
.subscribeOn(Schedulers.io())
.subscribe(new SingleObserver<Response<ResponseBody>>() {
@Override
public void onSubscribe(Disposable disposable) {
AppLogger.i(tag, "gzip download ->" + "subscribed");
}
@Override
public void onSuccess(Response<ResponseBody> responseBodyResponse) {
AppLogger.i(tag, "gzip downloaded " + " success");
AppLogger.i(tag, "gzip downloaded ->" + responseBodyResponse.toString());
if (responseBodyResponse.code() == 401) {
//not authorized
return;
}
// You should determine it based on response header.
if (responseBodyResponse.body() != null)
try {
gzipBody = null;
gzis = responseBodyResponse.body().byteStream();
ungzippedResponse = new GZIPInputStream(gzis);
reader = new InputStreamReader(ungzippedResponse, charset);
writer = new java.io.StringWriter();
buffer = new char[10240];
for (int length = 0; (length = reader.read(buffer)) > 0; ) {
writer.write(buffer, 0, length);
}
gzipBody = writer.toString();
formVersion.setJsonString(gzipBody);
AppLogger.i(tag, "set json string ->" + gzipBody);
} catch (IOException e) {
AppLogger.e(tag, "gzip extract exception->" + e.getLocalizedMessage(), e);
}
}
@Override
public void onError(Throwable throwable) {
AppLogger.e(tag, "gzip failed->" + throwable.getMessage(), throwable);
}
});
})
.doOnTerminate(() -> AppLogger.i(tag, "Form Versions terminated"))
.doOnError(Throwable::printStackTrace)
.doFinally(() -> {
baseRealm = Realm.getDefaultInstance();
baseRealm.executeTransaction(realm ->
realm.copyToRealmOrUpdate(form));
})
.subscribe(
formVersion -> AppLogger.i(tag, "Form Versions download completed"),
throwable -> AppLogger.e(tag, throwable.getMessage(), throwable)
);