
Observables
- RxJava - How Observable works
- RxJava - Creating Observables
- RxJava - Using Flowable
- RxJava - Using Observable
- RxJava - Single Observable
- RxJava - Maybe Observable
- RxJava - Completable Observable
- RxJava - Using CompositeDisposable
Operators
- RxJava - Creating Operators
- RxJava - Transforming Operators
- RxJava - Filtering Operators
- RxJava - Combining Operators
- RxJava - Utility Operators
- RxJava - Conditional Operators
- RxJava - Mathematical Operators
- RxJava - Connectable Operators
Subjects
- RxJava - Subjects
- RxJava - PublishSubject
- RxJava - BehaviorSubject
- RxJava - ReplaySubject
- RxJava - AsyncSubject
- RxJava - UnicastSubject
Schedulers
- RxJava - Schedulers
- RxJava - Trampoline Scheduler
- RxJava - NewThread Scheduler
- RxJava - Computation Scheduler
- RxJava - IO Scheduler
- RxJava - From Scheduler
Miscellaneous
RxJava Useful Resources
RxJava - Utility Operators
Following are the operators which are often useful with Observables.
Sr.No. | Operator & Description |
---|---|
1 |
delay Register action to handle Observable life-cycle events. |
2 |
materialize/dematerialize Represents item emitted and notification sent. |
3 |
observeOn Specify the scheduler to be observed. |
4 |
serialize Force Observable to make serialized calls. |
5 |
subscribe Operate upon the emissions of items and notifications like complete from an Observable |
6 |
subscribeOn Specify the scheduler to be used by an Observable when it is subscribed to. |
7 |
timeInterval Convert an Observable to emit indications of the amount of time elapsed between emissions. |
8 |
timeout Issues error notification if specified time occurs without emitting any item. |
9 |
timestamp Attach timestamp to each item emitted. |
9 |
using Creates a disposable resource or same lifespan as that of Observable. |
Example - Usage of subscribe operator
ObservableTester.java
package com.tutorialspoint; import io.reactivex.rxjava3.core.Observable; //Using subscribe operator to subscribe to an Observable public class ObservableTester { public static void main(String[] args) { String[] letters = {"a", "b", "c", "d", "e", "f", "g"}; final StringBuilder result = new StringBuilder(); Observable<String> observable = Observable.fromArray(letters); observable.subscribe( letter -> result.append(letter)); System.out.println(result); } }
Output
Compile and Run the code to verify the following output −
abcdefg
Example - Usage of timestamp operator
package com.tutorialspoint; import io.reactivex.rxjava3.core.Observable; //Using subscribe operator to subscribe to an Observable public class ObservableTester { public static void main(String[] args) { String[] letters = {"a", "b", "c", "d", "e", "f", "g"}; final StringBuilder result = new StringBuilder(); Observable<String> observable = Observable.fromArray(letters); observable .timestamp() .subscribe( letter -> result.append(letter + "\n")); System.out.println(result); } }
Output
Compile and Run the code to verify the following output −
Timed[time=1758342979382, unit=MILLISECONDS, value=a] Timed[time=1758342979386, unit=MILLISECONDS, value=b] Timed[time=1758342979386, unit=MILLISECONDS, value=c] Timed[time=1758342979386, unit=MILLISECONDS, value=d] Timed[time=1758342979386, unit=MILLISECONDS, value=e] Timed[time=1758342979386, unit=MILLISECONDS, value=f] Timed[time=1758342979386, unit=MILLISECONDS, value=g]