因为公司项目需要使用到天气信息，而且有国外的使用需求，所以就没有选择国内的信息提供商，而是把目光瞄向了国际化的 ACCUWeather。通过下面的两个链接，我们可以简单的了解到AccuWeather的信息和他提供的api。

ACCUWeather简介

ACCU API网站

我这里主要使用到两个访问URL：
请求城市编码：
http://dataservice.accuweather.com/locations/v1/cities/geoposition/search?apikey=APIKEY&q=GEOLOCATION&language=LANGUAGE
请求当前天气数据：
http://dataservice.accuweather.com/currentconditions/v1/LOCATIONKEY?apikey=APIKEY&language=LANGUAGE&details=true

上面URL中全大写字母的单词都是要替换的字符串
APIKEY： 在AccuWeather 开发者网站申请的应用key
GEOLOCATION： 定位获取到的经纬度数据， 格式是：”经度,纬度”。 由于本文主要是讲解天气API和网络相关的，所以定位获取的内容请自行学习。
LANGUAGE：请求想返回的数据的语言。 AccuWeather提供了有限的支持的语言列表，可以自行查询是否支持你想要的语言。查询支持的语言

AccuWeather 还有很多其他的如天气预报等API，需要的可以自行查询。

下面开始说说Okhttp和Retrofit

Okhttp、Retrofi和RxJava都是目前很盛行的Android开发框架，网络上面也有很多博客和网站讲解了，我这里就不详细讲解原理了，重点是使用。 一言不合就贴代码。

先使用Okhttp来获取数据

//构造查询城市信息的URL private String findCityByGeoLocation(String geolocation, String lang, boolean withLang) { StringBuilder builder = new StringBuilder(); builder.append("http://dataservice.accuweather.com/locations/v1/cities/geoposition/search?") .append("apikey=") .append(APIKEY) .append("&q=") .append(geolocation); if (withLang) { builder.append("&language=") .append(lang); } String string = builder.toString(); Log.d(TAG, "findCityByGeoLocation: " + string); return string; }

讯享网//获取JsonObject中的key private int getLocationKey(String response) { int key = -1; try { JSONObject object = new JSONObject(response); if (object.has("Key")) { key = object.getInt("Key"); } } catch (JSONException e) { e.printStackTrace(); } return key; } //使用Okhttp查询城市信息 private void findCityByOkHttp() { OkHttpClient client = new OkHttpClient.Builder().build(); final Request request = new Request.Builder() .url(findCityByGeoLocation(GEOLOCATION, "en", false)) .build(); okhttp3.Call call = client.newCall(request); call.enqueue(new okhttp3.Callback() { @Override public void onFailure(okhttp3.Call call, IOException e) { Log.d(TAG, "onFailure: " + e.getMessage()); } @Override public void onResponse(okhttp3.Call call, okhttp3.Response response) throws IOException { String result = response.body().string(); int code = response.code(); Log.d(TAG, "onResponse: " + code + ", " + result); //使用查询到的LocationKey 查询天气信息 currentWeatherByOkHttp(getLocationKey(result)); } }); }

//使用Okhttp查询天气信息 private void currentWeatherByOkHttp(int locationKey) { StringBuilder sb = new StringBuilder(); sb.append("http://dataservice.accuweather.com/currentconditions/v1/") .append(locationKey) .append("?") .append("apikey=") .append(APIKEY) .append("&") .append("language=en&") .append("details=true"); String url = sb.toString(); OkHttpClient client = new OkHttpClient(); final Request request = new Request.Builder() .url(url) .build(); okhttp3.Call call = client.newCall(request); call.enqueue(new okhttp3.Callback() { @Override public void onFailure(okhttp3.Call call, IOException e) { Log.d(TAG, "onFailure: " + e.getMessage()); } @Override public void onResponse(okhttp3.Call call, okhttp3.Response response) throws IOException { Log.d(TAG, "onResponse: " + response.body().string()); } }); }

上面使用Okhttp的代码其实很简单，只有两步操作，第一，先获取城市编码；第二，通过城市编码获取天气数据。使用Okhttp已经如此简洁了，那使用Retrofit岂不是更爽。

使用Retrofit请求数据

CityService.java

讯享网public interface CityService { 
    @GET("locations/v1/cities/geoposition/search") Call<CityBean> getCityString(@QueryMap Map<String, String> map); }

WeatherService.java

public interface WeatherService { 
    @Headers("Accept-Encoding: application/json") @GET("currentconditions/v1/{locationKey}") Call<List<WeatherBean>> currentWeather(@Path("locationKey") String locationKey, @QueryMap() Map<String, String> map); }

NetWork.java

//定义的方便进行网络操作的工具类 public class NetWork { 
    private static final String ACCU_URL = "http://dataservice.accuweather.com/"; private static final int CONNECT_TIME_OUT = 20; private static final int READ_TIME_OUT = 20; private static final int WRITE_TIME_OUT = 20; private static CityApi sCityApi; private static WeatherApi sWeatherApi; private static CityService sCityService; private static WeatherService sWeatherService; private static OkHttpClient sOkHttpClient; private static GsonConverterFactory gsonConverterFactory = GsonConverterFactory.create(); private static RxJavaCallAdapterFactory rxJavaCallAdapterFactory = RxJavaCallAdapterFactory.create(); private static NetWork sInstance; private NetWork() { sOkHttpClient = new OkHttpClient.Builder() .connectTimeout(CONNECT_TIME_OUT, TimeUnit.SECONDS) .readTimeout(READ_TIME_OUT, TimeUnit.SECONDS) .build(); } public static NetWork getInstance() { if (sInstance == null) { synchronized (NetWork.class) { if (sInstance == null) { sInstance = new NetWork(); } } } return sInstance; } public WeatherApi getWeatherApi() { if (sWeatherApi == null) { Retrofit retrofit = new Retrofit.Builder() .baseUrl(ACCU_URL) .client(sOkHttpClient) .addConverterFactory(gsonConverterFactory) .addCallAdapterFactory(rxJavaCallAdapterFactory) .build(); sWeatherApi = retrofit.create(WeatherApi.class); } return sWeatherApi; } public CityApi getCityApi() { if (sCityApi == null) { Retrofit retrofit = new Retrofit.Builder() .baseUrl(ACCU_URL) .client(sOkHttpClient) .addConverterFactory(gsonConverterFactory) .addCallAdapterFactory(rxJavaCallAdapterFactory) .build(); sCityApi = retrofit.create(CityApi.class); } return sCityApi; } public CityService getCityService() { if (sCityService == null) { Retrofit retrofit = new Retrofit.Builder() .baseUrl(ACCU_URL) .client(sOkHttpClient) .addConverterFactory(gsonConverterFactory) .addCallAdapterFactory(rxJavaCallAdapterFactory) .build(); sCityService = retrofit.create(CityService.class); } return sCityService; } public WeatherService getWeatherService() { if (sWeatherService == null) { Retrofit retrofit = new Retrofit.Builder() .baseUrl(ACCU_URL) .client(sOkHttpClient) .addConverterFactory(gsonConverterFactory) .addCallAdapterFactory(rxJavaCallAdapterFactory) .build(); sWeatherService = retrofit.create(WeatherService.class); } return sWeatherService; } }

MainActivity.java

private void findCityByRetrofit() { Map<String, String> map = new HashMap<>(); map.put("apikey", APIKEY); map.put("q", GEOLOCATION); map.put("language", "en"); NetWork.getInstance() .getCityService() .getCityString(map) .enqueue(new Callback<CityBean>() { @Override public void onResponse(Call<CityBean> call, Response<CityBean> response) { String key = response.body().getKey(); Log.d(TAG, "onResponse: " + key); currentWeatherByRetrofit(key); } @Override public void onFailure(Call<CityBean> call, Throwable t) { Log.e(TAG, "onFailure: " + t.getMessage()); } }); } private void currentWeatherByRetrofit(String locationKey) { String language = "en"; Map<String, String> map = new HashMap<>(); map.put("apikey", APIKEY); map.put("language", language); map.put("details", "true"); NetWork.getInstance() .getWeatherService() .currentWeather(locationKey, map) .enqueue(new Callback<List<WeatherBean>>() { @Override public void onResponse(Call<List<WeatherBean>> call, Response<List<WeatherBean>> response) { Log.d(TAG, "onResponse: " + response.body().get(0).toString()); } @Override public void onFailure(Call<List<WeatherBean>> call, Throwable t) { Log.e(TAG, "onFailure: " + t.getMessage()); } }); }

使用了Retrofit之后，我们想RxJava作为目前最火爆的框架之一，能不能加入到我们的项目中呢。
Retrofit + RxJava

CityApi.java

//定义City接口 public interface CityApi { 
    @GET("locations/v1/cities/geoposition/search") Observable<CityBean> getCityString(@QueryMap Map<String, String> map); }

WeatherApi.java

//定义Weather接口 public interface WeatherApi { 
    @GET("currentconditions/v1/{locationKey}") Observable<List<WeatherBean>> currentWeather(@Path("locationKey") String locationKey, @QueryMap() Map<String, String> map); }

MainActivity.java

private void findCityByRetrofitRxJava() { Map<String, String> map = new HashMap<>(); map.put("apikey", APIKEY); map.put("q", GEOLOCATION); map.put("language", "en"); NetWork.getInstance() .getCityApi() .getCityString(map) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Subscriber<CityBean>() { @Override public void onCompleted() { } @Override public void onError(Throwable e) { Log.e(TAG, "findCityByRetrofitRxJava onError: " + e.getLocalizedMessage()); } @Override public void onNext(CityBean cityBean) { if (cityBean != null) { String key = cityBean.getKey(); //to update weather Log.d(TAG, "onNext: " + cityBean.toString()); currentWeatherByRetrofitRxJava(cityBean); } } }); } private void currentWeatherByRetrofitRxJava(CityBean cityBean) { String language = "en"; Map<String, String> map = new HashMap<>(); map.put("apikey", APIKEY); map.put("language", language); map.put("details", "false"); NetWork.getInstance() .getWeatherApi() .currentWeather(cityBean.getKey(), map) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Subscriber<List<WeatherBean>>() { @Override public void onCompleted() { } @Override public void onError(Throwable e) { Log.e(TAG, "currentWeatherByRetrofitRxJava onError: " + e.getMessage()); } @Override public void onNext(List<WeatherBean> lists) { int size = lists.size(); WeatherBean bean = lists.get(0); Log.d(TAG, "onNext: " + "size: " + size + "" + bean.toString()); } }); }

GitHub:代码

本文只是个人工作学习中的知识回顾和记录，如有问题请指出。谢谢。