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RxJava, RxAndroid

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guilherme last edited by

What do the RxJava and RxAndroid libraries need? Where are they used?
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inna last edited by

RxJava - a lipstick to process events as sequences. The setting up of a patter observer can alter the sequence of events and so on. The liba can be seduced anywhere, but it's particularly useful to make any complex changes over events, like mixing, grouping, filtering, limiting, etc.
RxAndroid - RxJava liba contains all the stuff for a cheduler type of anndroid.
Any logic like "to fill the symbols in the textboxes from the laser, to send requests to the server in another flow, but not too often, with some delay, to update the interface" is written on these libs in a pair of lines, without a hemoroid with a bunch of service code.
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File handling
Software Programming • android • • Marcee

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getCacheDir() returns an object that describes the absolute path to folders with cash and mkdirs() creates a folder rather than a file.You need to make a way to the file. For example:fileName = File (this.getCacheDir(), "quest.txt");
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Reduce duplication of RxJava code
Software Programming • android rxjava repository • • gionna

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Decided with an abstract class. Maybe someone's gonna need it, or they'll offer you a better implementation. Because I'm calling the dialogue windows, then I'm transmitting the Context and String to the design.public abstract class DisposableMaybeAbstract<T> extends DisposableMaybeObserver<T> { @NonNull private Context context; @NonNull private String onComplete; @NonNull private String onError; public DisposableMaybeAbstract(@NonNull Context context, @NonNull String onComplete, @NonNull String onError) { this.context = context; this.onComplete = onComplete; this.onError = onError; } @Override public void onError(Throwable e) { MessageUtils.showCustomMessage(context, onError, context.getResources().getColor(R.color.colorRed)); } @Override public void onComplete() { MessageUtils.showCustomMessage(context, onComplete, context.getResources().getColor(R.color.colorRed)); } } And now my methods have such a structure. private void gettingAWallet(@NonNull final String getWalletAddress) { repository.gettingAWallet(userState.getEmail(), getWalletAddress).subscribe(new DisposableMaybeAbstract<PurseUser>(context, context.getString(R.string.purseNull), context.getString(R.string.transitionError)) { @Override public void onSuccess(PurseUser purse) { purseUser = purse; exchangeView.inizilizationUI(purseUser.getTypePurseEnum().getId()); } }); }
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data not retained for variables in the method RxJava
Software Programming • kotlin rxjava • • meriah

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It makes sense. You're inside the way getCoordinates signing up for the event of the new coordinates. You also listen to the main flow. You have zero probability that the observer will work in this frame. And you first have a way to getCoordines, which creates a signature and returns an empty line. After a while, the observer will get new coordinates and write to your variable, but the geCoordinates method will be implemented for a long time.You certainly shouldn't leave the method that way. You've got to have one method that creates a subscription only once and another one in which you get what's stored in the variable coordinates, given that there's nothing else to come in.PS Read about disposable. Now you're making a new subscription with every call, and the old ones don't go anywhere, you've got a memory leak.
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Components of the Form are disfigured - NetBeans
Software Programming • java java swing • • Saumya

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From the change of /questions/tagged/java-7 a /questions/tagged/java-8 some graphical problems were presented with the swing bookstore, some options you have are adding flags to modify the way it is rendered, as it internally uses /questions/tagged/java-2d for example:java -jar ./mi_programa.jar -Dsun.java2d.d3d=false this line if you are in windows you save it with extension .bat and save that file next to your jar, this will be the way the customer can run your application with double click. https://docs.oracle.com/javase/1.5.0/docs/guide/2d/flags.html .
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Functionality of BitmapFactory
Software Programming • android api bitmap • • Burma

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The class https://developer.android.com/reference/android/graphics/BitmapFactory.html creates bit map objects from various sources that can be files, streams, or byte-arrays. It is suggested to use when you upload images from the sdcard or disk.An example, create a bit map object from an image stored in the sdcard and which we add to an ImageView:ImageView imageView = (ImageView) findViewById(R.id.mi_imagen); //Convierte a mapa de bits Bitmap bitMap = BitmapFactory.decodeFile("/sdcard/mi_imagen.png"); //Carga imagen en imageView obtenida a partir de un recurso. imageView.setImageBitmap(bitMap);
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Should we work on legacy projects?
Software Programming • java spring work • • charlenef

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I don't do Java. I'm writing PHP.It turns out the next place will be asking for new questions. And the interviewers can't understand that the frimvors aren't important, and it's not hard to restructure. Just a matter of time.Draw up your petition projects on new technologies. Legacy experience, sometimes it's invaluable experience: Open a new project at work on the new window. Change the job in 1-2-3 years.
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How do you call VK SDK in RxJava?
Software Programming • java android rxjava • • zymir

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Create. Observable and create events that will be received by the subscribers somehow:Observable.create(subscriber -> { request.executeWithListener(new VKRequestListener() { @Override public void onComplete(VKResponse response) { //Do complete stuff subscriber.onNext(response); subscriber.onComplete(); } @Override public void onError(VKError error) { subscriber.onError(error.getException()); } @Override public void attemptFailed(VKRequest request, int attemptNumber, int totalAttempts) { //I don't really believe in progress subscriber.onError(new Exception()); } }); }) .subscribe( response -> System.out.println(response), e -> System.out.println(e.getMessage()) )
IntellijIDEA: Inactive Run button, Warning: "Method Main is never used."
Software Programming • java swing • • Alberto

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♪ public static void main() main necessary write with a little letter. Like all the other names of methods (but for the others, this is not so critical).
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How can a rxjava chain be implemented in android kotlin?
Software Programming • android kotlin rxjava • • Nykeriab

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You seem to have a major problem in signing a data source inside another data source. Which, of course, can be solved by running the signature. However, it would be better to avoid such decisions - signatures inside the source.Algorithm is a problem for you.Turn off the network.We've got a call online.Changes from the OBD were signed. You probably don't have Single, but Flowable. i.e. gives an event when changes are made to the OBD, dered Subject.After the network's on, you get the data from the server.The required data shall be recorded in the OBD by giving the previously registered subscriptions to these changes (see p.3)Simple (and very questionable) solution would replace the type of data source databaseRepository.getAllCountries() Single. This will only work once and will not respond to further changes in OBD.The right solution would not be to create an internal subscription, but to modify the available data source. The main point is to trace which types of sources are used. I don't know the expected principle of work, so I'm guessing you should just get the data from the cash or the network (writing the data into the OBD and cash). And don't need the data source to continue to live his difficult life:override fun requestAllCountries(): Completable { return getTimeSinceLastUpdate() // должен быть Single .flatMap { isMoreThanMinute -> if (isMoreThanMinute) { lastNetworkRequestTime = System.currentTimeMillis() networkRepository.getCountryDate() // должен быть Single .doOnSuccess { it.forEach { item -> databaseRepository.addLanguage(item.languages) // не должно быть Rx } databaseRepository.addAllCountries(it) // не должно быть Rx cacheRepository.addAllCountries(it) // не должно быть Rx } .flatMap { databaseRepository.getAllCountries() // должен быть Single } .onErrorResumeNext( databaseRepository.getAllCountries() // должен быть Single ) } else { cacheRepository.getAllCountries() // должен быть Single } } .doOnSuccess { Log.e("HZ", "$it") countrySubject.onNext(it) } .ignoreElement() }
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Discharge of all data when applied to the button
Software Programming • android • • Saumya

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Get SharedPreferences, this facility will have edit(s). The Editor will return. He'll have a clear method. Then the Editor calls to commit.
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How do you combine an uncertain number of RxJava 2 requests?
Software Programming • java android arraylist rxjava • • Burma

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In rxjava (and first and second) to combine observable fluxes, merge and concat are often used, depending on whether or not data are required.Made Api class for the test:public class Api { public Single<String> send(String s) { return Single.defer(() -> { try { Thread.sleep(1000L); } catch (InterruptedException e) { e.printStackTrace(); } return Single.just(s); }); } } Go ahead and try it.Rxjava2public static void main(String[] args) { List<String> list = List.of("a", "b", "c"); Api api = new Api(); List<Single<String>> collect = list.stream().map(api::send).collect(Collectors.toList()); Flowable<String> concat = Single.concat(collect); concat.subscribe(System.out::println); } Rxjava1public static void main(String[] args) { List<String> list = List.of("a", "b", "c", "d"); Api api = new Api(); List<Observable<String>> collect = list.stream() .map(api::send) .map(Single::toObservable) .collect(Collectors.toList()); Observable<String> concated = Observable.concat(collect); concated.subscribe(System.out::println); } EDITNo stream apiRxjava2public static void main(String[] args) { List<String> requests = List.of("a", "b", "c", "d"); Api api = new Api(); List<Single<String>> responses = new ArrayList<>(); for (String request : requests) { responses.add(api.send(request)); } Flowable<String> concatResponses = Single.concat(responses); concatResponses.subscribe(System.out::println); } Rxjava1public static void main(String[] args) { List<String> requests = List.of("a", "b", "c", "d"); Api api = new Api(); List<Observable<String>> responses = new ArrayList<>(); for (String request : requests) { responses.add(api.send(request).toObservable()); } Observable<String> concatResponses = Observable.concat(responses); concatResponses.subscribe(System.out::println); }
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Android Toolbar: center title
Software Programming • android • • zymir

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Remember that Toolbar is a ViewGroup, that is, you can put components inside it without any problems.To put a text in the center, place a TextView as the attribute android:gravity="center":<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:minHeight="?attr/actionBarSize" app:theme="@style/seuStyle" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="Seu titulo" android:textSize="16sp" /> </android.support.v7.widget.Toolbar> Just an important detail I’ve noticed in your layout: use the integer that’s in the AppCompat called ?attr/actionBarSize to set the size of your Toolbar. Will apply the standard and correct size for your Toolbar Referential: http://developer.android.com/reference/android/widget/Toolbar.html @EditIn your layout, the TextView how android:layout_width="wrap_content" and android:layout_height="wrap_content". Leave it as match_parent and it will work
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Neighborhood
Software Programming • java • • esther

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Something's so much fun. Put all the elements into two groups - clear and uneven. And then get them back in one, starting with the more. Compared to the original to calculate k♪ In order to save space, it is possible to assemble in the reference area, calculated k On your way.
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RxJava steam with type change
Software Programming • java android parcer rxjava • • derk

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add at the end .toList() I wish I could.Observable<String> logObservable = Observable.from(sQueueOfUnprocessedLogs) .filter(filterLog) .toList(); Then the result will be a set of lines
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How do we return the amended list from the OBD system by rxjava?
Software Programming • kotlin rxjava • • kalyn

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(1) Possible use of the function of the speciesfun Flowable<MutableList<Item>>.toItemEntity() { this.list.map { it as ItemEntity } } Then the challenge will be like this.loadLocalItems().toItemEntity() (2) The map method returns Flowable<MutableList<Item>> the code is below. mapper.mapDetailItem(it, itemDao.getAllDetailItemsById(it.idItem)) Repeat Item - In this way it is possible to simply return ItemEntity, for example:open class ItemEntity class Item: ItemEntity() { val k = 1 } fun getItems(): MutableList<ItemEntity> { return arrayListOf(ItemEntity(), ItemEntity()) } fun loadItems2(): MutableList<ItemEntity> { return getItems() .map { it -> mapToItem(it) } .toMutableList() } fun mapToItem(item: ItemEntity):ItemEntity { return ItemEntity() } line .map { it -> mapToItem(it) } I'm just returning the ItemEntity.

RxJava, RxAndroid

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How can a rxjava chain be implemented in android kotlin?
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