RXJAVA principle and application practice

RXJAVA principle and application practice RXJAVA is a response programming library based on the observer mode. It simplifies asynchronous programming by combining data flow with flow operations.It provides an elegant and combined way to handle asynchronous event sequences and can easily handle complex asynchronous logic. 1. The principle of rxjava The principle of RXJAVA is based on the following core concepts: 1. Observable (Observed): You can send out a series of events.When the data changes, the observer can issue a notice and pass the event to the observer. 2. Observer (Observer): Supervisor the events issued by observed objects and make the incident.Observer receives the event by subscribing to observer. 3. Subscripting (subscription): indicates the subscription relationship between the observer and the observer. 4. Operators: Provides a wealth of operators for processing and conversion of events issued by observer. 5. Schedulers: Provides support for thread scheduling and switching, so that thread management can be easily performed in asynchronous operations. Rxjava's ideas based on the event flow. When an event occurs, the observer can issue a corresponding event notification to the observer, and the observers make the corresponding treatment.RXJAVA supports the filtering, mapping, merger and aggregation of events, which can easily handle the event flow. Second, the application practice of rxjava 1. Create Observable and Observer Below is a simple example code, showing how to create an Observable and subscribe to an Observer to receive the event: Observable<String> observable = Observable.create(emitter -> { emitter.onNext("Hello"); emitter.onNext("RxJava"); emitter.onComplete(); }); Observer<String> observer = new Observer<String>() { @Override public void onSubscribe(Disposable d) { // The callbacks executed during subscription } @Override public void onNext(String s) { // Receive the recovery when receiving the event } @Override public void onError(Throwable e) { // The callback of execution when an error occurs } @Override public void onComplete() { // The callback of execution when completing the event flow } }; observable.subscribe(observer); 2. Use the operating character handling event RXJAVA provides a wealth of operators for processing and conversion of events issued by Observable.Below is a sample code that converts the string to uppercase using the MAP operator: Observable.just("hello") .map(String::toUpperCase) .subscribe(System.out::println); 3. thread scheduling RXJAVA can easily perform thread adjustment and switching, so that thread management can be better performed in asynchronous operations.Below is an example code that uses schedulers for thread switching: Observable.just("hello") .subscribeon (scheedulers.io ()) // execute in the IO thread .observeon (AndroidSchedulers.maintHread ()) // Switch to the main thread execution .subscribe(System.out::println); By using Subscripon and Observeon, you can specify which threads to execute subscriptions and event processing. Summarize: RXJAVA is a powerful asynchronous programming library that provides rich functions in processing event flow, thread scheduling and operating symbols.By understanding the principles and application practice of RXJAVA, we can better understand and apply this library to improve our development efficiency.