A graphic and text introduction summarizing the new features of RxJava 2.x
This article mainly introduces relevant information about the new features of RxJava 2.x. The article introduces it in detail through pictures, texts and sample codes. It has certain reference value for everyone. Friends who need it can take a look below.
What is RxJava
Rx is asynchronous reactive ProgrammingThe essence isObserver mode , asynchronous reactive programming with observers and subscribers.
This article mainly introduces relevant information about the new features of RxJava 2.x. I won’t say much below, let’s take a look at the detailed introduction.
Backpressure separation
##Flowable/Subscriber
Flowable.range(0,10)
.subscribe(new Subscriber<Integer>() {
Subscription sub;
//当订阅后，会首先调用这个方法，其实就相当于onStart()，
//传入的Subscription s参数可以用于请求数据或者取消订阅
@Override
public void onSubscribe(Subscription s) {
Log.w("TAG","onsubscribe start");
sub=s;
sub.request(1);
Log.w("TAG","onsubscribe end");
}
@Override
public void onNext(Integer o) {
Log.w("TAG","onNext--->"+o);
sub.request(1);
}
@Override
public void onError(Throwable t) {
t.printStackTrace();
}
@Override
public void onComplete() {
Log.w("TAG","onComplete");
}
});Output:
onsubscribe start onNext--->0 onNext--->1 onNext--->2 ... onNext--->10 onComplete onsubscribe end
subscription.request(n) method, the onNext method will be executed immediately before the code behind onSubscribe() is executed. Therefore, if you use a class that needs to be initialized in the onNext method, you should try to subscription.request(n) Do initialization work before calling this method;
Another creation method
Flowable.create(new FlowableOnSubscribe<Integer>() {
@Override
public void subscribe(FlowableEmitter<Integer> e) throws Exception {
e.onNext(1);
e.onNext(2);
e.onNext(3);
e.onNext(4);
e.onComplete();
}
}
//需要指定背压策略
, BackpressureStrategy.BUFFER);Other observations Pattern
- Single/SingleObserver
- Completable/CompletableObserver
- Maybe/MaybeObserver
//判断是否登陆
Maybe.just(isLogin())
//可能涉及到IO操作，放在子线程
.subscribeOn(Schedulers.newThread())
//取回结果传到主线程
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new MaybeObserver<Boolean>() {
@Override
public void onSubscribe(Disposable d) {
}
@Override
public void onSuccess(Boolean value) {
if(value){
...
}else{
...
}
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});event, you can use this observer pattern.
Action1——–ActionReference
#Summarize
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