binbinyang-- Retrofit 2.0的简单使用（入门篇）-GET请求

最近在看  Retrofit ！打算自己把 Retrofit 跟RXjava  跟OKHTTP融合一起。。慢慢一步步 自己搭建一个框架，自己抽取基类

话不多说。直接进入主题

官方文档

使用之前当然需要导入依赖库

compile 'com.squareup.okhttp3:okhttp:3.2.0'
compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'
compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta3'

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首先这个是我用百度api，聚合函数弄来的接口请求
http://v.juhe.cn/weather/index?format=1&cityname=%E6%80%80%E5%8C%96&key=c1b298ee331cd0aa1767470559303f26
是一个GET请求

其中 
http://v.juhe.cn  是网站地址 
/weather/index 是数据获取接口（查询数据是通过访问servlet链接获取） 
?format=1&cityname=%E6%80%80%E5%8C%96&key=c1b298ee331cd0aa1767470559303f26 通过？ & 连接查询条件 （也就是键值对）

这是请求后的数据

{
resultcode: "200",
reason: "successed!",
result: {
sk: {
temp: "25",
wind_direction: "西南风",
wind_strength: "1级",
humidity: "87%",
time: "09:21"
},
today: {
temperature: "25℃~30℃",
weather: "多云",
weather_id: {
fa: "01",
fb: "01"
},
wind: "南风微风",
week: "星期三",
city: "怀化",
date_y: "2017年07月12日",
dressing_index: "较舒适",
dressing_advice: "建议着薄外套或牛仔衫裤等服装。年老体弱者宜着夹克衫、薄毛衣等。昼夜温差较大，注意适当增减衣服。",
uv_index: "中等",
comfort_index: "",
wash_index: "较适宜",
travel_index: "适宜",
exercise_index: "适宜",
drying_index: ""
},
future: {
day_20170712: {
temperature: "25℃~30℃",
weather: "多云",
weather_id: {
fa: "01",
fb: "01"
},
wind: "南风微风",
week: "星期三",
date: "20170712"
},
day_20170713: {
temperature: "25℃~32℃",
weather: "多云转晴",
weather_id: {
fa: "01",
fb: "00"
},
wind: "南风微风",
week: "星期四",
date: "20170713"
},
day_20170714: {
temperature: "25℃~33℃",
weather: "多云转晴",
weather_id: {
fa: "01",
fb: "00"
},
wind: "南风微风",
week: "星期五",
date: "20170714"
},
day_20170715: {
temperature: "25℃~33℃",
weather: "多云",
weather_id: {
fa: "01",
fb: "01"
},
wind: "南风微风",
week: "星期六",
date: "20170715"
},
day_20170716: {
temperature: "25℃~34℃",
weather: "晴",
weather_id: {
fa: "00",
fb: "00"
},
wind: "南风微风",
week: "星期日",
date: "20170716"
},
day_20170717: {
temperature: "25℃~33℃",
weather: "多云转晴",
weather_id: {
fa: "01",
fb: "00"
},
wind: "南风微风",
week: "星期一",
date: "20170717"
},
day_20170718: {
temperature: "25℃~33℃",
weather: "多云",
weather_id: {
fa: "01",
fb: "01"
},
wind: "南风微风",
week: "星期二",
date: "20170718"
}
}
},
error_code: 0
}

需要先创建一个Bean类，可以手写，也可以使用GsonFormat生成，此类就是json转换成的java类，叫WeatherEntity
吧

/**
* Created by yangbin on 2017/7/10.
*/

public class WeatherEntity {

private String resultcode;
private String reason;
private ResultBean result;
private int error_code;

public String getResultcode() {
return resultcode;
}

public void setResultcode(String resultcode) {
this.resultcode = resultcode;
}

public String getReason() {
return reason;
}

public void setReason(String reason) {
this.reason = reason;
}

public ResultBean getResult() {
return result;
}

public void setResult(ResultBean result) {
this.result = result;
}

public int getError_code() {
return error_code;
}

public void setError_code(int error_code) {
this.error_code = error_code;
}

public static class ResultBean {
/**
* sk : {"temp":"25","wind_direction":"西南风","wind_strength":"1级","humidity":"87%","time":"09:21"}
* today : {"temperature":"25℃~30℃","weather":"多云","weather_id":{"fa":"01","fb":"01"},"wind":"南风微风","week":"星期三","city":"怀化","date_y":"2017年07月12日","dressing_index":"较舒适","dressing_advice":"建议着薄外套或牛仔衫裤等服装。年老体弱者宜着夹克衫、薄毛衣等。昼夜温差较大，注意适当增减衣服。","uv_index":"中等","comfort_index":"","wash_index":"较适宜","travel_index":"适宜","exercise_index":"适宜","drying_index":""}
* future : {"day_20170712":{"temperature":"25℃~30℃","weather":"多云","weather_id":{"fa":"01","fb":"01"},"wind":"南风微风","week":"星期三","date":"20170712"},"day_20170713":{"temperature":"25℃~32℃","weather":"多云转晴","weather_id":{"fa":"01","fb":"00"},"wind":"南风微风","week":"星期四","date":"20170713"},"day_20170714":{"temperature":"25℃~33℃","weather":"多云转晴","weather_id":{"fa":"01","fb":"00"},"wind":"南风微风","week":"星期五","date":"20170714"},"day_20170715":{"temperature":"25℃~33℃","weather":"多云","weather_id":{"fa":"01","fb":"01"},"wind":"南风微风","week":"星期六","date":"20170715"},"day_20170716":{"temperature":"25℃~34℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"南风微风","week":"星期日","date":"20170716"},"day_20170717":{"temperature":"25℃~33℃","weather":"多云转晴","weather_id":{"fa":"01","fb":"00"},"wind":"南风微风","week":"星期一","date":"20170717"},"day_20170718":{"temperature":"25℃~33℃","weather":"多云","weather_id":{"fa":"01","fb":"01"},"wind":"南风微风","week":"星期二","date":"20170718"}}
*/

private SkBean sk;
private TodayBean today;
private FutureBean future;

public SkBean getSk() {
return sk;
}

public void setSk(SkBean sk) {
this.sk = sk;
}

public TodayBean getToday() {
return today;
}

public void setToday(TodayBean today) {
this.today = today;
}

public FutureBean getFuture() {
return future;
}

public void setFuture(FutureBean future) {
this.future = future;
}

public static class SkBean {
/**
* temp : 25
* wind_direction : 西南风
* wind_strength : 1级
* humidity : 87%
* time : 09:21
*/

private String temp;
private String wind_direction;
private String wind_strength;
private String humidity;
private String time;

public String getTemp() {
return temp;
}

public void setTemp(String temp) {
this.temp = temp;
}

public String getWind_direction() {
return wind_direction;
}

public void setWind_direction(String wind_direction) {
this.wind_direction = wind_direction;
}

public String getWind_strength() {
return wind_strength;
}

public void setWind_strength(String wind_strength) {
this.wind_strength = wind_strength;
}

public String getHumidity() {
return humidity;
}

public void setHumidity(String humidity) {
this.humidity = humidity;
}

public String getTime() {
return time;
}

public void setTime(String time) {
this.time = time;
}
}

public static class TodayBean {
/**
* temperature : 25℃~30℃
* weather : 多云
* weather_id : {"fa":"01","fb":"01"}
* wind : 南风微风
* week : 星期三
* city : 怀化
* date_y : 2017年07月12日
* dressing_index : 较舒适
* dressing_advice : 建议着薄外套或牛仔衫裤等服装。年老体弱者宜着夹克衫、薄毛衣等。昼夜温差较大，注意适当增减衣服。
* uv_index : 中等
* comfort_index :
* wash_index : 较适宜
* travel_index : 适宜
* exercise_index : 适宜
* drying_index :
*/

private String temperature;
private String weather;
private WeatherIdBean weather_id;
private String wind;
private String week;
private String city;
private String date_y;
private String dressing_index;
private String dressing_advice;
private String uv_index;
private String comfort_index;
private String wash_index;
private String travel_index;
private String exercise_index;
private String drying_index;

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public WeatherIdBean getWeather_id() {
return weather_id;
}

public void setWeather_id(WeatherIdBean weather_id) {
this.weather_id = weather_id;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getWeek() {
return week;
}

public void setWeek(String week) {
this.week = week;
}

public String getCity() {
return city;
}

public void setCity(String city) {
this.city = city;
}

public String getDate_y() {
return date_y;
}

public void setDate_y(String date_y) {
this.date_y = date_y;
}

public String getDressing_index() {
return dressing_index;
}

public void setDressing_index(String dressing_index) {
this.dressing_index = dressing_index;
}

public String getDressing_advice() {
return dressing_advice;
}

public void setDressing_advice(String dressing_advice) {
this.dressing_advice = dressing_advice;
}

public String getUv_index() {
return uv_index;
}

public void setUv_index(String uv_index) {
this.uv_index = uv_index;
}

public String getComfort_index() {
return comfort_index;
}

public void setComfort_index(String comfort_index) {
this.comfort_index = comfort_index;
}

public String getWash_index() {
return wash_index;
}

public void setWash_index(String wash_index) {
this.wash_index = wash_index;
}

public String getTravel_index() {
return travel_index;
}

public void setTravel_index(String travel_index) {
this.travel_index = travel_index;
}

public String getExercise_index() {
return exercise_index;
}

public void setExercise_index(String exercise_index) {
this.exercise_index = exercise_index;
}

public String getDrying_index() {
return drying_index;
}

public void setDrying_index(String drying_index) {
this.drying_index = drying_index;
}

public static class WeatherIdBean {
/**
* fa : 01
* fb : 01
*/

private String fa;
private String fb;

public String getFa() {
return fa;
}

public void setFa(String fa) {
this.fa = fa;
}

public String getFb() {
return fb;
}

public void setFb(String fb) {
this.fb = fb;
}
}
}

public static class FutureBean {
/**
* day_20170712 : {"temperature":"25℃~30℃","weather":"多云","weather_id":{"fa":"01","fb":"01"},"wind":"南风微风","week":"星期三","date":"20170712"}
* day_20170713 : {"temperature":"25℃~32℃","weather":"多云转晴","weather_id":{"fa":"01","fb":"00"},"wind":"南风微风","week":"星期四","date":"20170713"}
* day_20170714 : {"temperature":"25℃~33℃","weather":"多云转晴","weather_id":{"fa":"01","fb":"00"},"wind":"南风微风","week":"星期五","date":"20170714"}
* day_20170715 : {"temperature":"25℃~33℃","weather":"多云","weather_id":{"fa":"01","fb":"01"},"wind":"南风微风","week":"星期六","date":"20170715"}
* day_20170716 : {"temperature":"25℃~34℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"南风微风","week":"星期日","date":"20170716"}
* day_20170717 : {"temperature":"25℃~33℃","weather":"多云转晴","weather_id":{"fa":"01","fb":"00"},"wind":"南风微风","week":"星期一","date":"20170717"}
* day_20170718 : {"temperature":"25℃~33℃","weather":"多云","weather_id":{"fa":"01","fb":"01"},"wind":"南风微风","week":"星期二","date":"20170718"}
*/

private Day20170712Bean day_20170712;
private Day20170713Bean day_20170713;
private Day20170714Bean day_20170714;
private Day20170715Bean day_20170715;
private Day20170716Bean day_20170716;
private Day20170717Bean day_20170717;
private Day20170718Bean day_20170718;

public Day20170712Bean getDay_20170712() {
return day_20170712;
}

public void setDay_20170712(Day20170712Bean day_20170712) {
this.day_20170712 = day_20170712;
}

public Day20170713Bean getDay_20170713() {
return day_20170713;
}

public void setDay_20170713(Day20170713Bean day_20170713) {
this.day_20170713 = day_20170713;
}

public Day20170714Bean getDay_20170714() {
return day_20170714;
}

public void setDay_20170714(Day20170714Bean day_20170714) {
this.day_20170714 = day_20170714;
}

public Day20170715Bean getDay_20170715() {
return day_20170715;
}

public void setDay_20170715(Day20170715Bean day_20170715) {
this.day_20170715 = day_20170715;
}

public Day20170716Bean getDay_20170716() {
return day_20170716;
}

public void setDay_20170716(Day20170716Bean day_20170716) {
this.day_20170716 = day_20170716;
}

public Day20170717Bean getDay_20170717() {
return day_20170717;
}

public void setDay_20170717(Day20170717Bean day_20170717) {
this.day_20170717 = day_20170717;
}

public Day20170718Bean getDay_20170718() {
return day_20170718;
}

public void setDay_20170718(Day20170718Bean day_20170718) {
this.day_20170718 = day_20170718;
}

public static class Day20170712Bean {
/**
* temperature : 25℃~30℃
* weather : 多云
* weather_id : {"fa":"01","fb":"01"}
* wind : 南风微风
* week : 星期三
* date : 20170712
*/

private String temperature;
private String weather;
private WeatherIdBeanX weather_id;
private String wind;
private String week;
private String date;

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public WeatherIdBeanX getWeather_id() {
return weather_id;
}

public void setWeather_id(WeatherIdBeanX weather_id) {
this.weather_id = weather_id;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getWeek() {
return week;
}

public void setWeek(String week) {
this.week = week;
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public static class WeatherIdBeanX {
/**
* fa : 01
* fb : 01
*/

private String fa;
private String fb;

public String getFa() {
return fa;
}

public void setFa(String fa) {
this.fa = fa;
}

public String getFb() {
return fb;
}

public void setFb(String fb) {
this.fb = fb;
}
}
}

public static class Day20170713Bean {
/**
* temperature : 25℃~32℃
* weather : 多云转晴
* weather_id : {"fa":"01","fb":"00"}
* wind : 南风微风
* week : 星期四
* date : 20170713
*/

private String temperature;
private String weather;
private WeatherIdBeanXX weather_id;
private String wind;
private String week;
private String date;

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public WeatherIdBeanXX getWeather_id() {
return weather_id;
}

public void setWeather_id(WeatherIdBeanXX weather_id) {
this.weather_id = weather_id;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getWeek() {
return week;
}

public void setWeek(String week) {
this.week = week;
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public static class WeatherIdBeanXX {
/**
* fa : 01
* fb : 00
*/

private String fa;
private String fb;

public String getFa() {
return fa;
}

public void setFa(String fa) {
this.fa = fa;
}

public String getFb() {
return fb;
}

public void setFb(String fb) {
this.fb = fb;
}
}
}

public static class Day20170714Bean {
/**
* temperature : 25℃~33℃
* weather : 多云转晴
* weather_id : {"fa":"01","fb":"00"}
* wind : 南风微风
* week : 星期五
* date : 20170714
*/

private String temperature;
private String weather;
private WeatherIdBeanXXX weather_id;
private String wind;
private String week;
private String date;

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public WeatherIdBeanXXX getWeather_id() {
return weather_id;
}

public void setWeather_id(WeatherIdBeanXXX weather_id) {
this.weather_id = weather_id;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getWeek() {
return week;
}

public void setWeek(String week) {
this.week = week;
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public static class WeatherIdBeanXXX {
/**
* fa : 01
* fb : 00
*/

private String fa;
private String fb;

public String getFa() {
return fa;
}

public void setFa(String fa) {
this.fa = fa;
}

public String getFb() {
return fb;
}

public void setFb(String fb) {
this.fb = fb;
}
}
}

public static class Day20170715Bean {
/**
* temperature : 25℃~33℃
* weather : 多云
* weather_id : {"fa":"01","fb":"01"}
* wind : 南风微风
* week : 星期六
* date : 20170715
*/

private String temperature;
private String weather;
private WeatherIdBeanXXXX weather_id;
private String wind;
private String week;
private String date;

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public WeatherIdBeanXXXX getWeather_id() {
return weather_id;
}

public void setWeather_id(WeatherIdBeanXXXX weather_id) {
this.weather_id = weather_id;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getWeek() {
return week;
}

public void setWeek(String week) {
this.week = week;
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public static class WeatherIdBeanXXXX {
/**
* fa : 01
* fb : 01
*/

private String fa;
private String fb;

public String getFa() {
return fa;
}

public void setFa(String fa) {
this.fa = fa;
}

public String getFb() {
return fb;
}

public void setFb(String fb) {
this.fb = fb;
}
}
}

public static class Day20170716Bean {
/**
* temperature : 25℃~34℃
* weather : 晴
* weather_id : {"fa":"00","fb":"00"}
* wind : 南风微风
* week : 星期日
* date : 20170716
*/

private String temperature;
private String weather;
private WeatherIdBeanXXXXX weather_id;
private String wind;
private String week;
private String date;

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public WeatherIdBeanXXXXX getWeather_id() {
return weather_id;
}

public void setWeather_id(WeatherIdBeanXXXXX weather_id) {
this.weather_id = weather_id;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getWeek() {
return week;
}

public void setWeek(String week) {
this.week = week;
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public static class WeatherIdBeanXXXXX {
/**
* fa : 00
* fb : 00
*/

private String fa;
private String fb;

public String getFa() {
return fa;
}

public void setFa(String fa) {
this.fa = fa;
}

public String getFb() {
return fb;
}

public void setFb(String fb) {
this.fb = fb;
}
}
}

public static class Day20170717Bean {
/**
* temperature : 25℃~33℃
* weather : 多云转晴
* weather_id : {"fa":"01","fb":"00"}
* wind : 南风微风
* week : 星期一
* date : 20170717
*/

private String temperature;
private String weather;
private WeatherIdBeanXXXXXX weather_id;
private String wind;
private String week;
private String date;

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public WeatherIdBeanXXXXXX getWeather_id() {
return weather_id;
}

public void setWeather_id(WeatherIdBeanXXXXXX weather_id) {
this.weather_id = weather_id;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getWeek() {
return week;
}

public void setWeek(String week) {
this.week = week;
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public static class WeatherIdBeanXXXXXX {
/**
* fa : 01
* fb : 00
*/

private String fa;
private String fb;

public String getFa() {
return fa;
}

public void setFa(String fa) {
this.fa = fa;
}

public String getFb() {
return fb;
}

public void setFb(String fb) {
this.fb = fb;
}
}
}

public static class Day20170718Bean {
/**
* temperature : 25℃~33℃
* weather : 多云
* weather_id : {"fa":"01","fb":"01"}
* wind : 南风微风
* week : 星期二
* date : 20170718
*/

private String temperature;
private String weather;
private WeatherIdBeanXXXXXXX weather_id;
private String wind;
private String week;
private String date;

public String getTemperature() {
return temperature;
}

public void setTemperature(String temperature) {
this.temperature = temperature;
}

public String getWeather() {
return weather;
}

public void setWeather(String weather) {
this.weather = weather;
}

public WeatherIdBeanXXXXXXX getWeather_id() {
return weather_id;
}

public void setWeather_id(WeatherIdBeanXXXXXXX weather_id) {
this.weather_id = weather_id;
}

public String getWind() {
return wind;
}

public void setWind(String wind) {
this.wind = wind;
}

public String getWeek() {
return week;
}

public void setWeek(String week) {
this.week = week;
}

public String getDate() {
return date;
}

public void setDate(String date) {
this.date = date;
}

public static class WeatherIdBeanXXXXXXX {
/**
* fa : 01
* fb : 01
*/

private String fa;
private String fb;

public String getFa() {
return fa;
}

public void setFa(String fa) {
this.fa = fa;
}

public String getFb() {
return fb;
}

public void setFb(String fb) {
this.fb = fb;
}
}
}
}
}
}

首先需要定义一个接口

/**
* Created by yangbin on 2017/7/10.
*/

public interface WeatherService {
@GET("/weather/index")
Call<WeatherEntity> getWeatherInfo(@Query("format") int format, @Query("cityname") String cityname, @Query("key") String key);
}

在Activity中

public class MainActivity extends AppCompatActivity {

@Bind(R.id.click_me_BN)
Button mClickMeBN;
@Bind(R.id.result_TV)
TextView mResultTV;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);

}

@OnClick(R.id.click_me_BN)
public void onClick() {
getMovie();
}

//进行网络请求
private void getMovie() {

String baseUrl = "http://v.juhe.cn/";

Retrofit retrofit = new Retrofit.Builder()
.baseUrl(baseUrl)
.addConverterFactory(GsonConverterFactory.create())
.build();

WeatherService movieService = retrofit.create(WeatherService.class);
Call<WeatherEntity> call = movieService.getWeatherInfo(1,"怀化","c1b298ee331cd0aa1767470559303f26");

call.enqueue(new Callback<WeatherEntity>() {
@Override
public void onResponse(Call<WeatherEntity> call, Response<WeatherEntity> response) {
if (response.isSuccessful()) {

mResultTV.setText(response.body().getResult().getSk().getHumidity().toString());
}

}

@Override
public void onFailure(Call<WeatherEntity> call, Throwable t) {
mResultTV.setText(t.getMessage());
}
});
}
}