rx-java2

问题 I have two Observable s, let's call them PeanutButter and Jelly . I'd like to combine them to a Sandwich Observable . I can do that using: Observable<PeanutButter> peanutButterObservable = ...; Observable<Jelly> jellyObservable = ...; Observable<Sandwich> sandwichObservable = Observable.combineLatest( peanutButterObservable, jellyObservable, (pb, j) -> makeSandwich(pb, j)) The problem is that RX waits for the first PeanutButter and the first Jelly to be emitted before emitting the first

问题 I have two Observable s, let's call them PeanutButter and Jelly . I'd like to combine them to a Sandwich Observable . I can do that using: Observable<PeanutButter> peanutButterObservable = ...; Observable<Jelly> jellyObservable = ...; Observable<Sandwich> sandwichObservable = Observable.combineLatest( peanutButterObservable, jellyObservable, (pb, j) -> makeSandwich(pb, j)) The problem is that RX waits for the first PeanutButter and the first Jelly to be emitted before emitting the first

问题 How do I make a single row query with Android Room with RxJava? I am able to query for List of items, no issues. Here, I want to find if a specific row exists. According to the docs, looks like I can return Single and check for EmptyResultSetException exception if no row exists. I can have something like: @Query("SELECT * FROM Users WHERE userId = :id LIMIT 1") Single<User> findByUserId(String userId); How do I use this call? Looks like there is some onError / onSuccess but cannot find those

问题 How do I make a single row query with Android Room with RxJava? I am able to query for List of items, no issues. Here, I want to find if a specific row exists. According to the docs, looks like I can return Single and check for EmptyResultSetException exception if no row exists. I can have something like: @Query("SELECT * FROM Users WHERE userId = :id LIMIT 1") Single<User> findByUserId(String userId); How do I use this call? Looks like there is some onError / onSuccess but cannot find those

问题 I have a singleton that takes a few seconds to instantiate. It makes the UI freezes. So I'm planning to make the getInstance() method asynchronous. Is writing the following code a common practice? /* * The singleton class */ public class Singleton { private static volatile Singleton instance; public static Observable<Singleton> getInstance(Context context) { return Observable.fromCallable(() -> { synchronized (Singleton.class) { if (instance == null) instance = new Singleton(context

问题 I'm using Dagger2. I will be injecting CompositeDisposable in ViewModel through @Inject constructor(private val compositeDisposable: CompositeDisposable) And my screen would also be using Android Pagination library and inside PageKeyedDataSource class I would be adding every network call into compositeDisposable using it's .add(diposable) . I also would be adding CompositeDisposable in PageKeyedDataSource constructor through Dagger graph. Is there any way that CompositeDisposable in ViewModel

问题 Observable.range(11,10).subscribeOn(Schedulers.io()) .observeOn(Schedulers.io()) .subscribe(new Observer<Integer>() { @Override public void onSubscribe(@NonNull Disposable d) { } @Override public void onNext(@NonNull Integer integer) { textView.setText(String.valueOf(integer)); Log.d(TAG, "onNext: "+Thread.currentThread().getName()); } @Override public void onError(@NonNull Throwable e) { } @Override public void onComplete() { } }); onNext() supposed to run on separate thread, but how is it

问题 The following code emits items from observable1 only after observable2 is completed. observable1.startWith(observable2) .subscribe() I need to achieve another behavior observable1 -> 0 1 2 3 observable2 -> 1 2 3 4 5 6 observable1.startWithDefault(observable2) -> 1 2 0 1 2 3 The second observable emits items only while first observable is empty and then items from first one are emited. I could not find correct solution using only basic operators, what is correct RxJava 2 implementation of

问题 As definied combineLatest in rx emites only if all values have changed at least once. (so long as each of the source Observables has emitted at least one item) I use it to manipulate views within my android views. For example, I enable a call to action button as soon as all observables emitted a valid value. Otherwise I disable it. Observable.combineLatest( toObservable(email), toObservable(username), toObservable(status), toObservable(phonenumber), toObservable(birthdate), Function5<String,

问题 As definied combineLatest in rx emites only if all values have changed at least once. (so long as each of the source Observables has emitted at least one item) I use it to manipulate views within my android views. For example, I enable a call to action button as soon as all observables emitted a valid value. Otherwise I disable it. Observable.combineLatest( toObservable(email), toObservable(username), toObservable(status), toObservable(phonenumber), toObservable(birthdate), Function5<String,