GitHub - open-android/RxjavaUtils: Rxjava工具类
参数声明，Url都通过Annotation指定，接口定义如下：
private interface AppApi {
@GET("/weather")
WeatherData getWeather(@Query("q") String city, @Query("mode") String mode, @Query("APPID") String APPID);
}
返回数据如下，可以使用GsonFormat自动生成javabean（即WeatherData)：
{"coord":{"lon":114.07,"lat":22.55},"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01n"}],"base":"stations","main":{"temp":293.15,"pressure":1018,"humidity":72,"temp_min":293.15,"temp_max":293.15},"visibility":10000,"wind":{"speed":3.69,"deg":116.004},"clouds":{"all":0},"dt":1483538400,"sys":{"type":1,"id":7420,"message":0.0134,"country":"CN","sunrise":1483484686,"sunset":1483523588},"id":1795565,"name":"Shenzhen","cod":200}
第二步是通过RestAdapter生成API接口服务的实现类(动态代理)
private static final RestAdapter restAdapter = new RestAdapter.Builder().setEndpoint(ENDPOINT).setLogLevel(RestAdapter.LogLevel.FULL).build();
private static final AppApi appService = restAdapter.create(AppApi.class);
第三步是关键的一步，将返回的数据类型包装到一个数据源（Observable）中。 onNext是RxJava发送事件，即开始请求数据，onCompleted为结束任务的事件，subscribeOn为指定获取数据的线程为耗时线程。
public static Observable<WeatherData> getWeatherData(final String city) {
return Observable.create(new Observable.OnSubscribe<WeatherData>() {
@Override
public void call(Subscriber<? super WeatherData> subscriber) {
subscriber.onNext(appService.getWeather(city,"json", "6c113432fd84a6e28268af291821db16"));
subscriber.onCompleted();
}
}).subscribeOn(Schedulers.io());
}
最后调用封装好的方法就可以了，拿到数据后，在主线程中回调（subscribeOn(Schedulers.io()），获取单个天气示例如下：
RxJavaUtil.getWeatherData(cityName).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Action1<WeatherData>() {
@Override
public void call(WeatherData weatherData) {
Log.d(LOG_TAG, weatherData.toString());
switch (cityName){
case "beijing":
mTv1.setText(weatherData.toString());
break;
case "shenzhen":
mTv2.setText(weatherData.toString());
break;
case "shanghai":
mTv3.setText(weatherData.toString());
break;
}
}
}, new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
Log.e(LOG_TAG, throwable.getMessage(), throwable);
}
});
当获取多个天气时候，要使用到Rxjava的变换，简单点理解，就是一个数据源变成多个数据源，一对多的映射关系。
Observable.from(cities).flatMap(new Func1<String, Observable<WeatherData>>() {
@Override
public Observable<WeatherData> call(String city) {
return RxJavaUtil.getWeatherData(city);
}
}).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(/*onNext*/new Action1<WeatherData>() {
@Override
public void call(WeatherData weatherData) {
String cityName = weatherData.name.toLowerCase();
switch (cityName){
case "beijing":
mTv1.setText(weatherData.toString());
break;
case "shenzhen":
mTv2.setText(weatherData.toString());
break;
case "shanghai":
mTv3.setText(weatherData.toString());
break;
}
}
}, /*onError*/new Action1<Throwable>() {
@Override
public void call(Throwable throwable) {
}
});}