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分分钟使用Retrofit+Rxjava实现网络请求

撸代码之前,先简单了解一下为什么Retrofit这么受大家青睐吧。🧐🧐🧐

Retrofit是Square公司出品的基于OkHttp封装的一套RESTful(目前流行的一套api设计的风格)网络请求框架。它内部使用了大量的设计模式,以达到高度解耦的目的;它可以直接通过注解的方式配置请求;可以使用不同的Http客户端;还可以使用json Converter序列化数据,直接转换成你期望生成的实体bean;它还支持Rxjava等等等(此处省略一万字.....)

好了,接下来开始我们就开始上代码,写个小Demo测试一下它的使用吧!

使用步骤:

1、app的build文件中加入:

//only Retrofit(只用Retrofit联网)
   compile 'com.squareup.retrofit2:retrofit:2.1.0'
   compile 'com.squareup.retrofit2:converter-gson:2.1.0'
//Rxjava and Retrofit(Retrofit+Rx需要添加的依赖)
   compile 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
   compile 'io.reactivex:rxandroid:1.2.1'
   compile 'io.reactivex:rxjava:1.2.1'
           

2、接下来就要编写实现retrofit联网的代码了,以Get请求为例,示例接口:(

http://wthrcdn.etouch.cn/weather_mini?city=

北京)

首先,你需要创建一个interface用来配置网络请求。

写法《一》:单纯使用Retrofit,不加Rxjava的使用

/**
* 描述:第一步:定义一个接口配置网络请求
*/
public interface WeatherService {
//  网络接口的使用为查询天气的接口
//  
   @GET("weather_mini")
//  此处回调返回的可为任意类型Call<T>,再也不用自己去解析json数据啦!!!
   Call<WeatherEntity> getMessage(@Query("city") String city);
           

在需要请求网络的地方直接调用下面的方法即可:

/**
    * 单纯使用Retrofit的联网请求
    */
   private void doRequestByRetrofit() {
       Retrofit retrofit = new Retrofit.Builder()
               .baseUrl(API.BASE_URL)//基础URL 建议以 / 结尾
               .addConverterFactory(GsonConverterFactory.create())//设置 Json 转换器
               .build();
       WeatherService weatherService = retrofit.create(WeatherService .class);
       Call<WeatherEntity> call = weatherService.getMessage("北京");
       call.enqueue(new Callback<WeatherEntity>() {
           @Override
           public void onResponse(Call<WeatherEntity> call, Response<WeatherEntity> response) {
               //测试数据返回
               WeatherEntity weatherEntity = response.body();
               Log.e("TAG", "response == " +  weatherEntity.getData().getGanmao());
           }

           @Override
           public void onFailure(Call<WeatherEntity> call, Throwable t) {
               Log.e("TAG", "Throwable : " + t);
           }
       });
   }

           

写法《二》 Retrofit + Rxjava

区别:使用Rxjava后,返回的不是Call<T>而是一个Observable<T>的对象了。

public interface RxWeatherService {
   @GET("weather_mini")
   Observable<WeatherEntity> getMessage(@Query("city") String city);
}
           

请求联网代码:

private void doRequestByRxRetrofit() {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(API.BASE_URL)//基础URL 建议以 / 结尾
                .addConverterFactory(GsonConverterFactory.create())//设置 Json 转换器
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())//RxJava 适配器
                .build();
        RxWeatherService rxjavaService = retrofit.create(RxWeatherService .class);
        rxjavaService .getMessage("北京")
                .subscribeOn(Schedulers.io())//IO线程加载数据
                .observeOn(AndroidSchedulers.mainThread())//主线程显示数据
                .subscribe(new Subscriber<WeatherEntity>() {
                    @Override
                    public void onCompleted() {

                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onNext(WeatherEntity weatherEntity) {
                Log.e("TAG", "response == " + weatherEntity.getData().getGanmao());
                    }
                });
    }
           

免费赠送一个WeatherEntity实体类(只给偷懒的小伙伴):

(在浏览器打开

北京,取到json串直接用GsonFormat生成即可)

public class WeatherEntity {
    private DataBean data;
    private int status;
    private String desc;

    public DataBean getData() {
        return data;
    }

    public void setData(DataBean data) {
        this.data = data;
    }

    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public static class DataBean {
        private YesterdayBean yesterday;
        private String city;
        private String aqi;
        private String ganmao;
        private String wendu;
        private List<ForecastBean> forecast;

        public YesterdayBean getYesterday() {
            return yesterday;
        }

        public void setYesterday(YesterdayBean yesterday) {
            this.yesterday = yesterday;
        }

        public String getCity() {
            return city;
        }

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

        public String getAqi() {
            return aqi;
        }

        public void setAqi(String aqi) {
            this.aqi = aqi;
        }

        public String getGanmao() {
            return ganmao;
        }

        public void setGanmao(String ganmao) {
            this.ganmao = ganmao;
        }

        public String getWendu() {
            return wendu;
        }

        public void setWendu(String wendu) {
            this.wendu = wendu;
        }

        public List<ForecastBean> getForecast() {
            return forecast;
        }

        public void setForecast(List<ForecastBean> forecast) {
            this.forecast = forecast;
        }

        public static class YesterdayBean {
   
            private String date;
            private String high;
            private String fx;
            private String low;
            private String fl;
            private String type;

            public String getDate() {
                return date;
            }

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

            public String getHigh() {
                return high;
            }

            public void setHigh(String high) {
                this.high = high;
            }

            public String getFx() {
                return fx;
            }

            public void setFx(String fx) {
                this.fx = fx;
            }

            public String getLow() {
                return low;
            }

            public void setLow(String low) {
                this.low = low;
            }

            public String getFl() {
                return fl;
            }

            public void setFl(String fl) {
                this.fl = fl;
            }

            public String getType() {
                return type;
            }

            public void setType(String type) {
                this.type = type;
            }
        }

        public static class ForecastBean {
  
            private String date;
            private String high;
            private String fengli;
            private String low;
            private String fengxiang;
            private String type;

            public String getDate() {
                return date;
            }

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

            public String getHigh() {
                return high;
            }

            public void setHigh(String high) {
                this.high = high;
            }

            public String getFengli() {
                return fengli;
            }

            public void setFengli(String fengli) {
                this.fengli = fengli;
            }

            public String getLow() {
                return low;
            }

            public void setLow(String low) {
                this.low = low;
            }

            public String getFengxiang() {
                return fengxiang;
            }

            public void setFengxiang(String fengxiang) {
                this.fengxiang = fengxiang;
            }

            public String getType() {
                return type;
            }

            public void setType(String type) {
                this.type = type;
            }
        }
    }
}

           

好了,简单的Retrofit+Rxjava实现联网到此就完成了。本文主要针对初接触retrofit的开发童鞋,如果对你有所帮助,不要忘了点个赞哦!

后续会更新Retrofit+Rxjava在实际项目开发中的运用,可以直接拿来在项目中使用噢.......敬请期待