android json解析（JSONObject方法实现）

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今天刚刚学到json解析，看了一整天，大概了解到json就是你通过一个API（我用的聚合数据的API）发送一个请求，接着会收到json数据，比如说天气预报吧，他会给你发送一大段字符串，大概是未来几天的天气情况了什么的，因为这个数据我们想把它规则的展现在手机屏幕上，但是我们得到的json数据未经处理的话，很乱没有美感，也不方便看，就需要我们解析出这些数据并展现在手机屏幕上

cityName = URLEncoder.encode(city,"UTF-8"); 这句话将汉字转化为UTF-8编码

1.首先是要获取json数据，我是直接使用了已经集成的Volley包，获得的数据，Volley又有get和post方法，这里使用get方法

Volley方法获得json数据：

private void volley_get()
{
String cityName;
String city;
@Override
Toast.makeText(MainActivity.this, cityName, Toast.LENGTH_SHORT).show();
String url = "http://v.juhe.cn/weather/index?format=2&cityname=%E8%8B%8F%E5%B7%9E&=你申请的Key";
/*
* StringRequest中的第一个参数，是我们获取数据所调用的方法 Method.GET
*第二个参数，是我们获得的API的接口 url
*第三个参数，是当请求成功时所调用的参数
* 第四个参数，是请求失败时所调用的参数
* */
StringRequest request = new StringRequest(Method.GET, url, new Response.Listener<String>()
{
@Override
public void onResponse(String s)
{//参数s就是我们请求成功时返回的json数据
Toast.makeText(MainActivity.this, "加载数据成功", Toast.LENGTH_SHORT).show();
}, new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError volleyError)
{
Toast.makeText(MainActivity.this, "对不起，加载数据失败", Toast.LENGTH_SHORT).show();
}
});
request.setTag("abcGet");
MyApplication.getHttpQueues().add(request);//因为Volley方法就是通过请求队列的方法实现的，所以这里要加入队列 }); }

获得到的天气数据

{"resultcode":"200","reason":"successed!","result":{"sk":{"temp":"37","wind_direction":"西风","wind_strength":"2级","humidity":"49%","time":"18:28"},"today":{"temperature":"30℃~38℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西南风微风","week":"星期二","city":"苏州","date_y":"2016年07月26日","dressing_index":"炎热","dressing_advice":"天气炎热，建议着短衫、短裙、短裤、薄型T恤衫等清凉夏季服装。","uv_index":"很强","comfort_index":"","wash_index":"较适宜","travel_index":"较适宜","exercise_index":"较适宜","drying_index":""},"future":[{"temperature":"30℃~38℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西南风微风","week":"星期二","date":"20160726"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西风微风","week":"星期三","date":"20160727"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西南风微风","week":"星期四","date":"20160728"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"南风微风","week":"星期五","date":"20160729"},{"temperature":"28℃~37℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"东风微风","week":"星期六","date":"20160730"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西南风微风","week":"星期日","date":"20160731"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西风微风","week":"星期一","date":"20160801"}]},"error_code":0}

然后在上边的volley_get方法中解析json使其规则的显现

在上边的volley_get方法中请求成功时调用的参数中实现

public void onResponse(String s) { //参数s就是我们请求成功时返回的json数据
// tv_1.setText(s);
String weather_city = null;
String weather_date_y = null;
String weather_dressing_advice= null;
String weather_exercise_index= null;
String weather_temperature= null;
String weather_travel_index= null;
String weather_wea= null;
String weather_week= null;
String weather_wind= null;
//
try {
JSONObject jsonObject = new JSONObject(s);
String resultcode = jsonObject.getString("resultcode");
if(resultcode.equals("200")){
JSONObject resultObject=jsonObject.getJSONObject("result");
JSONObject todayObject=resultObject.getJSONObject("today");
weather_city = todayObject.getString("city");
weather_date_y = todayObject.getString("date_y");
weather_dressing_advice = todayObject.getString("dressing_advice");
weather_exercise_index = todayObject.getString("exercise_index");
weather_temperature = todayObject.getString("temperature");
weather_travel_index = todayObject.getString("travel_index");
weather_wea = todayObject.getString("weather");
weather_week = todayObject.getString("week");
weather_wind = todayObject.getString("wind");
}
} catch (JSONException e) {
e.printStackTrace();
}
tv_1.setText("城市："+weather_city);
tv_2.setText("日期："+weather_date_y);
tv_3.setText("穿衣指数："+weather_dressing_advice);
tv_4.setText("锻炼指数："+weather_exercise_index);
tv_5.setText("温度："+weather_temperature);
tv_6.setText("旅行指数："+weather_travel_index);
tv_7.setText("天气："+weather_wea);
tv_8.setText("星期："+weather_week);
tv_9.setText("风力："+weather_wind);
}
}