使用前准备

• 免费的公共接口:查询天气
  https://www.apiopen.top/weatherApi?city=临沂

接口返回数据的内容，并做Gson类解析

1. 返回内容

{
    "code":200,
    "msg":"成功!",
    "data":{
        "yesterday":{
            "date":"3日星期日",
            "high":"高温 10℃",
            "fx":"北风",
            "low":"低温 1℃",
            "fl":"<![CDATA[<3级]]>",
            "type":"小雨"
        },
        "city":"临沂",
        "aqi":null,
        "forecast":[
            {
                "date":"4日星期一",
                "high":"高温 9℃",
                "fengli":"<![CDATA[<3级]]>",
                "low":"低温 0℃",
                "fengxiang":"东南风",
                "type":"阴"
            },
            {
                "date":"5日星期二",
                "high":"高温 14℃",
                "fengli":"<![CDATA[<3级]]>",
                "low":"低温 1℃",
                "fengxiang":"北风",
                "type":"阴"
            },
            {
                "date":"6日星期三",
                "high":"高温 12℃",
                "fengli":"<![CDATA[3-4级]]>",
                "low":"低温 3℃",
                "fengxiang":"东北风",
                "type":"晴"
            },
            {
                "date":"7日星期四",
                "high":"高温 11℃",
                "fengli":"<![CDATA[<3级]]>",
                "low":"低温 0℃",
                "fengxiang":"东南风",
                "type":"晴"
            },
            {
                "date":"8日星期五",
                "high":"高温 11℃",
                "fengli":"<![CDATA[<3级]]>",
                "low":"低温 0℃",
                "fengxiang":"东北风",
                "type":"阴"
            }
        ],
        "ganmao":"天凉，昼夜温差较大，较易发生感冒，请适当增减衣服，体质较弱的朋友请注意适当防护。",
        "wendu":"8"
    }
}

2. Gson数据解析

public class WeatherInfoModel {
    public String code;
    @SerializedName("message")
    public String message;
    @SerializedName("data")
    public WeatherInfo weatherInfo;

    public class WeatherInfo{
        @SerializedName("yesterday")
        public DayWeatherInfo yesterdayWeatherInfo;
        public String city;
        public String aqi;
        @SerializedName("forecast")
        public List<DayWeatherInfo> forecastWeatherInfo;
        @SerializedName("ganmao")
        public String hint;
        public String wendu;
    }

    public class DayWeatherInfo{
        public String date;
        public String high;
        public String fx;
        public String low;
        public String fl;
        public String type;
    }

    @Override
    public String toString(){
        return "城市: " + weatherInfo.city+", 天气:"+weatherInfo.forecastWeatherInfo.get(0).type+", "+ weatherInfo.forecastWeatherInfo.get(0).high+", "
                + weatherInfo.forecastWeatherInfo.get(0).low+", 提醒:"+weatherInfo.hint;
    }

Gson的分析移步Json数据解析-Gson库

创建请求接口

public interface WeatherService {
    /**
     * 动态指定查询条件
     * @Query("字段")
     * */
    @GET("weatherApi")
    Observable<WeatherInfoModel> getWeatherInfo(@Query("city") String city);
}

创建Retrofit并实例化WeatherService

        Retrofit retrofit = new Retrofit.Builder().
                baseUrl(URL).
                addConverterFactory(GsonConverterFactory.create()).
                addCallAdapterFactory(RxJavaCallAdapterFactory.create()).
                build();
        mWeatherService = retrofit.create(WeatherService.class);

通过接口获取Observable并订阅执行

        Observable observable = weatherService.getWeatherInfo(city).subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread());
        Observer observer = new Observer<WeatherInfoModel>() {
            @Override
            public void onCompleted() {
                LogShowUtil.addLog("Retrofit","结束",true);
            }

            @Override
            public void onError(Throwable e) {
                LogShowUtil.addLog("Retrofit","异常",true);
            }

            @Override
            public void onNext(WeatherInfoModel weatherInfoModel) {
                LogShowUtil.addLog("Retrofit","当前线程: "+Thread.currentThread().getName(),true);
                if (weatherInfoModel.code.equals("200")){
                    LogShowUtil.addLog("Retrofit",weatherInfoModel.toString(),true);
                }else {
                    LogShowUtil.addLog("Retrofit", "请求失败: " + weatherInfoModel.message,true);
                }
            }
        };
        observable.subscribe(observer);