RxJava 的使用入门

1 dependencies {
2     compile fileTree(dir: ‘libs‘, include: [‘*.jar‘])
3     compile ‘com.android.support:appcompat-v7:22.0.0‘
4     compile ‘io.reactivex:rxjava:1.0.9‘
5     compile ‘io.reactivex:rxandroid:0.24.0‘
6     compile ‘com.squareup.retrofit:retrofit:1.9.0‘
7 }

 1 /**
 2  * 接口
 3  * Created by Hal on 15/4/26.
 4  */
 5 public class ApiManager {
 6 
 7     private static final String ENDPOINT = "http://api.openweathermap.org/data/2.5";
 8 
 9     /**
10      * 服务接口
11      */
12     private interface ApiManagerService {
13         @GET("/weather")
14         WeatherData getWeather(@Query("q") String place, @Query("units") String units);
15     }
16 
17     private static final RestAdapter restAdapter = new RestAdapter.Builder().setEndpoint(ENDPOINT).setLogLevel(RestAdapter.LogLevel.FULL).build();
18 
19     private static final ApiManagerService apiManager = restAdapter.create(ApiManagerService.class);
20 
21     /**
22      * 将服务接口返回的数据，封装成{@link rx.Observable}
23      * @param city
24      * @return
25      */
26     public static Observable<WeatherData> getWeatherData(final String city) {
27         return Observable.create(new Observable.OnSubscribe<WeatherData>() {
28             @Override
29             public void call(Subscriber<? super WeatherData> subscriber) {
30                 //订阅者回调 onNext 和 onCompleted
31                 subscriber.onNext(apiManager.getWeather(city, "metric"));
32                 subscriber.onCompleted();
33             }
34         }).subscribeOn(Schedulers.io());
35     }
36 }

 1   /**
 2          * 多个 city 请求
 3          * map，flatMap 对 Observable进行变换
 4          */
 5         Observable.from(CITIES).flatMap(new Func1<String, Observable<WeatherData>>() {
 6             @Override
 7             public Observable<WeatherData> call(String s) {
 8                 return ApiManager.getWeatherData(s);
 9             }
10         }).subscribeOn(Schedulers.io())
11                 .observeOn(AndroidSchedulers.mainThread())
12                 .subscribe(/*onNext*/new Action1<WeatherData>() {
13                     @Override
14                     public void call(WeatherData weatherData) {
15                         Log.d(LOG_TAG, weatherData.toString());
16                     }
17                 }, /*onError*/new Action1<Throwable>() {
18                     @Override
19                     public void call(Throwable throwable) {
20 
21                     }
22                 });
23 
24         /**
25          * 单个 city 请求
26          */
27         ApiManager.getWeatherData(CITIES[0]).subscribeOn(Schedulers.io())
28                 .observeOn(AndroidSchedulers.mainThread())
29                 .subscribe(new Action1<WeatherData>() {
30                     @Override
31                     public void call(WeatherData weatherData) {
32                         Log.d(LOG_TAG, weatherData.toString());
33                         ((TextView) findViewById(R.id.text)).setText(weatherData.toString());
34                     }
35                 }, new Action1<Throwable>() {
36                     @Override
37                     public void call(Throwable throwable) {
38                         Log.e(LOG_TAG, throwable.getMessage(), throwable);
39                     }
40                 });
41 
42         /**
43          * Android View 事件处理
44          */
45         ViewObservable.clicks(findViewById(R.id.text), false).subscribe(new Action1<OnClickEvent>() {
46             @Override
47             public void call(OnClickEvent onClickEvent) {
48 
49             }
50         });

 1 /**
 2      * 服务接口
 3      */
 4     private interface ApiManagerService {
 5         @GET("/weather")
 6         WeatherData getWeather(@Query("q") String place, @Query("units") String units);
 7 
 8         /**
 9          * retrofit 支持 rxjava 整合
10          * 这种方法适用于新接口
11          */
12         @GET("/weather")
13         Observable<WeatherData> getWeatherData(@Query("q") String place, @Query("units") String units);
14     }