Retrofit+RxJava的简单使用发起网络请求（天气预报）

其他 2018-06-02 05:17:01 阅读次数: 0

来用一下Retrofit+RxJava，用了一个天气的接口来试验

请求的地址：https://www.sojson.com/open/api/weather/json.shtml?city=长春

1、添加依赖

    implementation 'com.squareup.retrofit2:retrofit:2.1.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.1.0'
    implementation 'com.squareup.retrofit2:adapter-rxjava:2.1.0'
    implementation 'io.reactivex:rxandroid:1.2.1'
    implementation 'io.reactivex:rxjava:1.2.1'

2、添加网络请求权限

<uses-permission android:name="android.permission.INTERNET"/>

3、创建接受服务器返回的数据的类Weather，用来解析Json

Json格式如下：

{"date":"20180525","message":"Success !","status":200,"city":"北京","count":623,"data":{"shidu":"48%","pm25":55.0,"pm10":129.0,"quality":"轻度污染","wendu":"23","ganmao":"儿童、老年人及心脏、呼吸系统疾病患者人群应减少长时间或高强度户外锻炼","yesterday":{"date":"24日星期四","sunrise":"04:53","high":"高温 31.0℃","low":"低温 17.0℃","sunset":"19:30","aqi":114.0,"fx":"南风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},"forecast":[{"date":"25日星期五","sunrise":"04:53","high":"高温 31.0℃","low":"低温 19.0℃","sunset":"19:30","aqi":94.0,"fx":"西南风","fl":"<3级","type":"多云","notice":"阴晴之间，谨防紫外线侵扰"},{"date":"26日星期六","sunrise":"04:52","high":"高温 30.0℃","low":"低温 16.0℃","sunset":"19:31","aqi":72.0,"fx":"西北风","fl":"4-5级","type":"雷阵雨","notice":"带好雨具，别在树下躲雨"},{"date":"27日星期日","sunrise":"04:51","high":"高温 31.0℃","low":"低温 15.0℃","sunset":"19:32","aqi":77.0,"fx":"西南风","fl":"<3级","type":"多云","notice":"阴晴之间，谨防紫外线侵扰"},{"date":"28日星期一","sunrise":"04:51","high":"高温 30.0℃","low":"低温 18.0℃","sunset":"19:33","aqi":51.0,"fx":"北风","fl":"<3级","type":"多云","notice":"阴晴之间，谨防紫外线侵扰"},{"date":"29日星期二","sunrise":"04:50","high":"高温 29.0℃","low":"低温 16.0℃","sunset":"19:34","aqi":50.0,"fx":"北风","fl":"<3级","type":"晴","notice":"愿你拥有比阳光明媚的心情"}]}}

利用GsonFormat创建Weather

package com.example.administrator.retrofitrxjavatest;

import java.util.List;


public class Weather {
    /**
     * date : 20180523
     * message : Success !
     * status : 200
     * city : 北京
     * count : 1011
     * data : {"shidu":"24%","pm25":73,"pm10":356,"quality":"重度污染","wendu":"16","ganmao":"老年人及心脏、呼吸系统疾病患者人群应停留在室内，停止户外运动，一般人群减少户外运动","yesterday":{"date":"22日星期二","sunrise":"04:55","high":"高温 25.0℃","low":"低温 10.0℃","sunset":"19:28","aqi":98,"fx":"西北风","fl":"4-5级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},"forecast":[{"date":"23日星期三","sunrise":"04:54","high":"高温 29.0℃","low":"低温 15.0℃","sunset":"19:29","aqi":77,"fx":"西南风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"24日星期四","sunrise":"04:53","high":"高温 31.0℃","low":"低温 17.0℃","sunset":"19:30","aqi":96,"fx":"南风","fl":"<3级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"25日星期五","sunrise":"04:53","high":"高温 30.0℃","low":"低温 19.0℃","sunset":"19:30","aqi":90,"fx":"南风","fl":"<3级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"26日星期六","sunrise":"04:52","high":"高温 28.0℃","low":"低温 14.0℃","sunset":"19:31","aqi":71,"fx":"南风","fl":"<3级","type":"阴","notice":"不要被阴云遮挡住好心情"},{"date":"27日星期日","sunrise":"04:51","high":"高温 28.0℃","low":"低温 16.0℃","sunset":"19:32","aqi":77,"fx":"西北风","fl":"3-4级","type":"多云","notice":"阴晴之间，谨防紫外线侵扰"}]}
     */
    public String date;
    public String message;
    public int status;
    public String city;
    public int count;
    public DataBean data;

    public String getDate() {
        return date;
    }

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

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public int getStatus() {
        return status;
    }

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

    public String getCity() {
        return city;
    }

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

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public DataBean getData() {
        return data;
    }

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

    public static class DataBean {
        /**
         * shidu : 24%
         * pm25 : 73.0
         * pm10 : 356.0
         * quality : 重度污染
         * wendu : 16
         * ganmao : 老年人及心脏、呼吸系统疾病患者人群应停留在室内，停止户外运动，一般人群减少户外运动
         * yesterday : {"date":"22日星期二","sunrise":"04:55","high":"高温 25.0℃","low":"低温 10.0℃","sunset":"19:28","aqi":98,"fx":"西北风","fl":"4-5级","type":"晴","notice":"愿你拥有比阳光明媚的心情"}
         * forecast : [{"date":"23日星期三","sunrise":"04:54","high":"高温 29.0℃","low":"低温 15.0℃","sunset":"19:29","aqi":77,"fx":"西南风","fl":"3-4级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"24日星期四","sunrise":"04:53","high":"高温 31.0℃","low":"低温 17.0℃","sunset":"19:30","aqi":96,"fx":"南风","fl":"<3级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"25日星期五","sunrise":"04:53","high":"高温 30.0℃","low":"低温 19.0℃","sunset":"19:30","aqi":90,"fx":"南风","fl":"<3级","type":"晴","notice":"愿你拥有比阳光明媚的心情"},{"date":"26日星期六","sunrise":"04:52","high":"高温 28.0℃","low":"低温 14.0℃","sunset":"19:31","aqi":71,"fx":"南风","fl":"<3级","type":"阴","notice":"不要被阴云遮挡住好心情"},{"date":"27日星期日","sunrise":"04:51","high":"高温 28.0℃","low":"低温 16.0℃","sunset":"19:32","aqi":77,"fx":"西北风","fl":"3-4级","type":"多云","notice":"阴晴之间，谨防紫外线侵扰"}]
         */

        public String shidu;
        public double pm25;
        public double pm10;
        public String quality;
        public String wendu;
        public String ganmao;
        public YesterdayBean yesterday;
        public List<ForecastBean> forecast;

        public String getShidu() {
            return shidu;
        }

        public void setShidu(String shidu) {
            this.shidu = shidu;
        }

        public double getPm25() {
            return pm25;
        }

        public void setPm25(double pm25) {
            this.pm25 = pm25;
        }

        public double getPm10() {
            return pm10;
        }

        public void setPm10(double pm10) {
            this.pm10 = pm10;
        }

        public String getQuality() {
            return quality;
        }

        public void setQuality(String quality) {
            this.quality = quality;
        }

        public String getWendu() {
            return wendu;
        }

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

        public String getGanmao() {
            return ganmao;
        }

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

        public YesterdayBean getYesterday() {
            return yesterday;
        }

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

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

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

        public static class YesterdayBean {
            /**
             * date : 22日星期二
             * sunrise : 04:55
             * high : 高温 25.0℃
             * low : 低温 10.0℃
             * sunset : 19:28
             * aqi : 98.0
             * fx : 西北风
             * fl : 4-5级
             * type : 晴
             * notice : 愿你拥有比阳光明媚的心情
             */

            public String date;
            public String sunrise;
            public String high;
            public String low;
            public String sunset;
            public double aqi;
            public String fx;
            public String fl;
            public String type;
            public String notice;

            public String getDate() {
                return date;
            }

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

            public String getSunrise() {
                return sunrise;
            }

            public void setSunrise(String sunrise) {
                this.sunrise = sunrise;
            }

            public String getHigh() {
                return high;
            }

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

            public String getLow() {
                return low;
            }

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

            public String getSunset() {
                return sunset;
            }

            public void setSunset(String sunset) {
                this.sunset = sunset;
            }

            public double getAqi() {
                return aqi;
            }

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

            public String getFx() {
                return fx;
            }

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

            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 String getNotice() {
                return notice;
            }

            public void setNotice(String notice) {
                this.notice = notice;
            }
        }

        public static class ForecastBean {
            /**
             * date : 23日星期三
             * sunrise : 04:54
             * high : 高温 29.0℃
             * low : 低温 15.0℃
             * sunset : 19:29
             * aqi : 77.0
             * fx : 西南风
             * fl : 3-4级
             * type : 晴
             * notice : 愿你拥有比阳光明媚的心情
             */

            public String date;
            public String sunrise;
            public String high;
            public String low;
            public String sunset;
            public String aqi;
            public String fx;
            public String fl;
            public String type;
            public String notice;

            public String getDate() {
                return date;
            }

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

            public String getSunrise() {
                return sunrise;
            }

            public void setSunrise(String sunrise) {
                this.sunrise = sunrise;
            }

            public String getHigh() {
                return high;
            }

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

            public String getLow() {
                return low;
            }

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

            public String getSunset() {
                return sunset;
            }

            public void setSunset(String sunset) {
                this.sunset = sunset;
            }

            public String getAqi() {
                return aqi;
            }

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

            public String getFx() {
                return fx;
            }

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

            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 String getNotice() {
                return notice;
            }

            public void setNotice(String notice) {
                this.notice = notice;
            }
        }
    }
}

4、创建用于请求网络的接口RxWeatherService

interface RxWeatherService {

    @GET("weather/json.shtml")
    Observable<Weather> getCall(@Query("city") String city);

}

5、给Retrofit做一下封装，采用单例，新建Retrofit的实例，然后使用Gson解析，支持RxJava,

      这些操作都封装好了，返回一个网络请求接口实例，我们在Maintivity调用就好了

public class RequestUtils {
    private static final String baseUrl = "https://www.sojson.com/open/api/";
    private static Retrofit retrofit;
    private static RxWeatherService rxWeatherService;

    public static RxWeatherService getInstance() {
        /**
         * 创建Retrofit对象，设置网络请求url,添加Gson依赖，添加Rx适配器,创建网络请求接口实例
         */
        if (retrofit == null) {
            synchronized (RequestUtils.class) {
                if (retrofit == null) {
                    retrofit = new Retrofit.Builder()
                            .baseUrl(baseUrl)
                            .addConverterFactory(GsonConverterFactory.create())
                            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                            .build();
                    rxWeatherService = retrofit.create(RxWeatherService.class);
                }
            }
        }
        return rxWeatherService;
    }
}

6、在MainActivity中发送请求

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

    private void sendRequestWithRxJava() {
        RequestUtils.getInstance().getCall(param)
                .subscribeOn(Schedulers.io())// 切换到IO线程进行网络请求
                .observeOn(AndroidSchedulers.mainThread())// 切换回到主线程 处理请求结果
                .subscribe(new Subscriber<Weather>() {
                    @Override
                    public void onCompleted() {

                    }
                    @Override
                    public void onError(Throwable e) {
                        Toast.makeText(MainActivity.this, "接口异常，请等待", Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onNext(Weather weather) {

                        forecastList = weather.getData().getForecast();
                        city.setText(weather.getCity().toString());
                        currentTemp.setText(weather.getData().getWendu().toString() + "℃");
                        type.setText(forecastList.get(0).getType().toString());
                        aqi.setText("空气  " + weather.getData().getQuality().toString());
                        ganmao.setText("温馨提示：" + weather.getData().getGanmao().toString());
                        bodyTemp.setText("体感温度  " + weather.getData().getWendu().toString() + "℃");
                        shidu.setText("湿度    " + weather.getData().getShidu().toString());
                        fxfl.setText(forecastList.get(0).getFx().toString() + " " + forecastList.get(0).getFl().toString());
                        sunrise.setText("日出  " + forecastList.get(0).getSunrise().toString());
                        sunset.setText("日落  " + forecastList.get(0).getSunset().toString());
                        pm25.setText(forecastList.get(0).getAqi().toString());
                        aqi2.setText(weather.getData().getQuality().toString());
                        pm25Small.setText("PM2.5:  " + forecastList.get(0).getAqi().toString());

                        //我们从网上得到的数据放到了forecastList中，然后把他传到适配器中显示到listview当中
                        adapter = new ForecastAdapter(MainActivity.this, R.layout.weather_list_item, forecastList);
                        tomorrowWeatherLisview.setAdapter(adapter);

                    }
                });
    }

7、测试结果：

       

8、Demo地址：https://github.com/pengboboer/RetrofitRxJavaTest

MainActivity的布局文件还有几张图片在Demo当中，这里就不贴出来了，有需要的自己下载

说明：这个天气接口是免费的，在这里感谢接口站长，这只是一个小Demo,没有设置缓存，但如果大家真的在自己的项目中用到了这个接口，尤其有城市添加和城市切换功能的时候，一定要设置缓存，一方面自己的App比较流畅，再一个也减轻接口的请求压力。

总结

使用Retrofit和RxJava还是很爽的，RxJava的异步还是很强大的，代码逻辑很清晰，在此记录一下，方便同学们查阅。



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