网络编程是安卓开发中必不可少的一个部分，这里会举一个天气APP的例子。
效果如下：
本文只讲述网络编程与json解析相关部分。定位,城市选择等其他内容可以自行查阅相关文章。
本次网络编程使用的是rxvolley，RxVolley是一个基于Volley的网络请求库；
json数据解析使用的是Google的gson
详细请见：
RxVolley使用文档
RxVolley官方项目地址github
RxVolley缺点：1.图片加载性能一般2.对大资源下载支持不够。由于我们本文只需获取天气信息，资源小没有图片（app中的图片是自己写的逻辑相应配的）
本文使用的接口如下：（和风天气等其他接口返回的数据大同小异不重复介绍）
https://www.apiopen.top/weatherApi?city=湘潭
访问后：
使用下边的网站查看后的效果：
在线json格式化网站
这算是一个较为复杂的json数据了，我们开始用代码获取并解析，放入到APP中吧。
使用Gsonformat生成对应的java对象
GsonFormat是一个Android Studio中的插件，它可以大大提高我们生成Bean类时的速度
AndroidStudio中下载Jsonformat插件1
AndroidStudio中下载Jsonformat插件2
图二选中GsonFormat后右边会有个绿色的install按钮，我下载过了所以没显示。
使用插件也很方便，将访问接口的结果复制到剪贴板，新建一个java类，鼠标右键选中Generate后选择GsonFormat，将返回的json数据拷贝进去点击ok即可生成对应的数据类。
以下GsonFormat插件自动生成的代码
package com.lipiao.news;
import java.util.List;
public class WeatherBean {
/**
* code : 200
* msg : 成功!
* data : {"yesterday":{"date":"5日星期二","high":"高温 17℃","fx":"无持续风向","low":"低温 10℃","fl":"<![CDATA[<3级]]>","type":"晴"},"city":"成都","aqi":null,"forecast":[{"date":"6日星期三","high":"高温 15℃","fengli":"<![CDATA[<3级]]>","low":"低温 9℃","fengxiang":"无持续风向","type":"小雨"},{"date":"7日星期四","high":"高温 10℃","fengli":"<![CDATA[<3级]]>","low":"低温 7℃","fengxiang":"无持续风向","type":"小雨"},{"date":"8日星期五","high":"高温 10℃","fengli":"<![CDATA[<3级]]>","low":"低温 7℃","fengxiang":"无持续风向","type":"小雨"},{"date":"9日星期六","high":"高温 15℃","fengli":"<![CDATA[<3级]]>","low":"低温 8℃","fengxiang":"无持续风向","type":"多云"},{"date":"10日星期天","high":"高温 16℃","fengli":"<![CDATA[<3级]]>","low":"低温 9℃","fengxiang":"无持续风向","type":"多云"}],"ganmao":"天冷空气湿度大，易发生感冒，请注意适当增加衣服，加强自我防护避免感冒。","wendu":"10"}
*/
private int code;
private String msg;
private DataBean data;
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public DataBean getData() {
return data;
}
public void setData(DataBean data) {
this.data = data;
}
public static class DataBean {
/**
* yesterday : {"date":"5日星期二","high":"高温 17℃","fx":"无持续风向","low":"低温 10℃","fl":"<![CDATA[<3级]]>","type":"晴"}
* city : 成都
* aqi : null
* forecast : [{"date":"6日星期三","high":"高温 15℃","fengli":"<![CDATA[<3级]]>","low":"低温 9℃","fengxiang":"无持续风向","type":"小雨"},{"date":"7日星期四","high":"高温 10℃","fengli":"<![CDATA[<3级]]>","low":"低温 7℃","fengxiang":"无持续风向","type":"小雨"},{"date":"8日星期五","high":"高温 10℃","fengli":"<![CDATA[<3级]]>","low":"低温 7℃","fengxiang":"无持续风向","type":"小雨"},{"date":"9日星期六","high":"高温 15℃","fengli":"<![CDATA[<3级]]>","low":"低温 8℃","fengxiang":"无持续风向","type":"多云"},{"date":"10日星期天","high":"高温 16℃","fengli":"<![CDATA[<3级]]>","low":"低温 9℃","fengxiang":"无持续风向","type":"多云"}]
* ganmao : 天冷空气湿度大，易发生感冒，请注意适当增加衣服，加强自我防护避免感冒。
* wendu : 10
*/
private YesterdayBean yesterday;
private String city;
private Object 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 Object getAqi() {
return aqi;
}
public void setAqi(Object 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 {
/**
* date : 5日星期二
* high : 高温 17℃
* fx : 无持续风向
* low : 低温 10℃
* fl : <![CDATA[<3级]]>
* type : 晴
*/
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 {
/**
* date : 6日星期三
* high : 高温 15℃
* fengli : <![CDATA[<3级]]>
* low : 低温 9℃
* fengxiang : 无持续风向
* type : 小雨
*/
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;
}
}
}
}
接下来通过访问网络获取数据以及使用这个类。
1.添加网络访问权限：
<uses-permission android:name="android.permission.INTERNET" />
2.dependencies下导包：
implementation 'com.kymjs.rxvolley:rxvolley:1.1.4'//网络请求
implementation 'com.google.code.gson:gson:2.8.5'//json解析
2.子线程下访问接口获取并解析成对象
private static WeatherBean weatherBean;
private String weatherUrl = "https://www.apiopen.top/weatherApi?city=";
//获取weatherBean
public WeatherBean getWeatherBean() {
return weatherBean;
}
//初始化weatherbean
public void setWeatherBean(String city) {
useWeatherApi(weatherUrl + city);
}
private void useWeatherApi(String weatherUrl) {
try {
RxVolley.get(weatherUrl, new HttpCallback() {
@Override
public void onSuccess(String t) {
//解析返回的JSON数据
handleWeatherJson(t);
}
});
}//try
catch (Exception e) {
//Log.d(TAG, "useApi: 错误");
}
}
//解析json数据(weather)
private void handleWeatherJson(String message) {
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(message);
Gson gson = new Gson();
weatherBean = gson.fromJson(jsonObject.toString(), WeatherBean.class);
} catch (JSONException e) {
//Log.d(TAG, "handleWeatherJson: 错误");
}
}
这样，访问接口返回的json数据就赋给插件自动生成java对象了，需要用的时候就可以很方便的获取数据了，这里我是写了个工具类，总之获取那个WeatherBean对象即可。想用什么数据就get什么即可。
WeatherBean weatherBean= JsonUtil.getJsonUtil().getWeatherBean();
//location
weatherBean.getData().getCity();
//advice
weatherBean.getData().getGanmao()；
//省略
//...
APP中每日一句也是同样的方法，数据更简单，这里不再赘述。
使用的是爱词霸的接口：
http://open.iciba.com/dsapi/
本来想上传至小米APP商店的，但....
看来这APP还上不了台面...
于是就上传至蒲公英了，感兴趣的同学欢迎点击下方链接下载或扫描二维码下载
app下载地址
如果觉得文章写得还不错，点个赞呗~
