Getting Started with the RxJava

First, what is RxJava?

RxJava is a responsive programming framework that uses the observer design pattern. So naturally there are Observable and subscriber these two things.

RxJava is an open source project, address: Https://github.com/ReactiveX/RxJava

There is also a rxandroid, used for Android development, adding an interface for Android. Address: Https://github.com/ReactiveX/RxAndroid

Ii. examples

Return weather data by requesting the Openweathermap weather query interface

1. Increase compilation dependency

1 Dependencies {2     ' Libs ', include: [' *.jar '])3     ' com.android.support:appcompat-v7 : 22.0.0 '4     ' io.reactivex:rxjava:1.0.9 '5     ' Io.reactivex: rxandroid:0.24.0 '6     ' com.squareup.retrofit:retrofit:1.9.0 '7 }

Retrofit is a restful request client. See: http://square.github.io/retrofit/

2. Server interface

1 /**2 * Interface3 * Created by Hal on 15/4/26.4  */5  Public classApimanager {6 7     Private Static FinalString ENDPOINT = "http://api.openweathermap.org/data/2.5";8 9     /**Ten * Service Interface One      */ A     Private InterfaceApimanagerservice { -@GET ("/weather") -Weatherdata GetWeather (@Query ("Q") String Place, @Query ("units") String units); the     } -  -     Private Static FinalRestadapter Restadapter =NewRestadapter.builder (). setEndPoint (ENDPOINT). Setloglevel (RestAdapter.LogLevel.FULL). build (); -  +     Private Static FinalApimanagerservice Apimanager = Restadapter.create (apimanagerservice.class); -  +     /** A * The data returned by the service interface is encapsulated into {@linkRx. Observable} at      * @param City -      * @return -      */ -      Public StaticObservable<weatherdata> Getweatherdata (FinalString City) { -         returnObservable.create (NewObservable.onsubscribe<weatherdata>() { - @Override in              Public voidCall (SUBSCRIBER&LT;?SuperWeatherdata>subscriber) { -                 //subscribers callback OnNext and oncompleted toSubscriber.onnext (Apimanager.getweather (City, "metric"))); + subscriber.oncompleted (); -             } the }). Subscribeon (Schedulers.io ()); *     } $}

The subscriber's callback has three methods, onnext,onerror,oncompleted

3. Interface invocation

1   /**2 * Multiple City requests3 * Map,flatmap transforms the observable4          */5Observable.from (CITIES). FlatMap (NewFunc1<string, observable<weatherdata>>() {6 @Override7              PublicObservable<weatherdata>Call (String s) {8                 returnApimanager.getweatherdata (s);9             }Ten }). Subscribeon (Schedulers.io () ) One . Observeon (Androidschedulers.mainthread ()) A. Subscribe (/*OnNext*/NewAction1<weatherdata>() { - @Override -                      Public voidCall (Weatherdata weatherdata) { the log.d (Log_tag, weatherdata.tostring ()); -                     } -},/*OnError*/NewAction1<throwable>() { - @Override +                      Public voidCall (Throwable throwable) { -  +                     } A                 }); at  -         /** - * Single City request -          */ -Apimanager.getweatherdata (cities[0]). Subscribeon (Schedulers.io () ) - . Observeon (Androidschedulers.mainthread ()) in. Subscribe (NewAction1<weatherdata>() { - @Override to                      Public voidCall (Weatherdata weatherdata) { + log.d (Log_tag, weatherdata.tostring ()); - ((TextView) Findviewbyid (R.id.text)). SetText (Weatherdata.tostring ()); the                     } *},NewAction1<throwable>() { $ @OverridePanax Notoginseng                      Public voidCall (Throwable throwable) { - log.e (Log_tag, Throwable.getmessage (), throwable); the                     } +                 }); A  the         /** + * Android View event handling -          */ $Viewobservable.clicks (Findviewbyid (R.id.text),false). Subscribe (NewAction1<onclickevent>() { $ @Override -              Public voidCall (Onclickevent onclickevent) { -  the             } -});

Subscribeon (Schedulers.io () ) and Observeon (Androidschedulers.mainthread ( )) define the threads for each of these two actions. Android UI updates are required on the main thread.

4, Retrofit support Rxjava integration

1 /**2 * Service Interface3      */4     Private InterfaceApimanagerservice {5@GET ("/weather")6Weatherdata GetWeather (@Query ("Q") String Place, @Query ("units") String units);7 8         /**9 * Retrofit supports Rxjava integrationTen * This method is suitable for new interfaces One          */ A@GET ("/weather") -Observable<weatherdata> Getweatherdata (@Query ("Q") String Place, @Query ("units") String units); -}

Demo Code

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Getting Started with the RxJava