今天剛剛學到json解析，看了一整天，大概了解到json就是你通過一個API（我用的聚合數據的API）發送一個請求，接着會收到json數據，比如說天氣預報吧，他會給你發送一大段字符串，大概是未來幾天的天氣情況了什么的，因為這個數據我們想把它規則的展現在手機屏幕上，但是我們得到的json數據未經處理的話，很亂沒有美感，也不方便看，就需要我們解析出這些數據並展現在手機屏幕上
cityName = URLEncoder.encode(city,"UTF-8"); 這句話將漢字轉化為UTF-8編碼
1.首先是要獲取json數據，我是直接使用了已經集成的Volley包，獲得的數據，Volley又有get和post方法，這里使用get方法
Volley方法獲得json數據：
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&=你申請的Key";
/*
* StringRequest中的第一個參數，是我們獲取數據所調用的方法 Method.GET
*第二個參數，是我們獲得的API的接口 url
*第三個參數，是當請求成功時所調用的參數
* 第四個參數，是請求失敗時所調用的參數
* */
StringRequest request = new StringRequest(Method.GET, url, new Response.Listener<String>()
{
@Override
public void onResponse(String s)
{//參數s就是我們請求成功時返回的json數據
Toast.makeText(MainActivity.this, "加載數據成功", Toast.LENGTH_SHORT).show();
}, new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError volleyError)
{
Toast.makeText(MainActivity.this, "對不起，加載數據失敗", Toast.LENGTH_SHORT).show();
}
});
request.setTag("abcGet");
MyApplication.getHttpQueues().add(request);//因為Volley方法就是通過請求隊列的方法實現的，所以這里要加入隊列
});
}
獲得到的天氣數據
{"resultcode":"200","reason":"successed!","result":{"sk":{"temp":"37","wind_direction":"西風","wind_strength":"2級","humidity":"49%","time":"18:28"},"today":{"temperature":"30℃~38℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西南風微風","week":"星期二","city":"蘇州","date_y":"2016年07月26日","dressing_index":"炎熱","dressing_advice":"天氣炎熱，建議着短衫、短裙、短褲、薄型T恤衫等清涼夏季服裝。","uv_index":"很強","comfort_index":"","wash_index":"較適宜","travel_index":"較適宜","exercise_index":"較適宜","drying_index":""},"future":[{"temperature":"30℃~38℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西南風微風","week":"星期二","date":"20160726"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西風微風","week":"星期三","date":"20160727"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西南風微風","week":"星期四","date":"20160728"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"南風微風","week":"星期五","date":"20160729"},{"temperature":"28℃~37℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"東風微風","week":"星期六","date":"20160730"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西南風微風","week":"星期日","date":"20160731"},{"temperature":"29℃~39℃","weather":"晴","weather_id":{"fa":"00","fb":"00"},"wind":"西風微風","week":"星期一","date":"20160801"}]},"error_code":0}
然后在上邊的volley_get方法中解析json使其規則的顯現
在上邊的volley_get方法中 請求成功時調用的參數中實現
public void onResponse(String s) { //參數s就是我們請求成功時返回的json數據
// 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("穿衣指數 ："+weather_dressing_advice);
tv_4.setText("鍛煉指數 ："+weather_exercise_index);
tv_5.setText("溫度 ："+weather_temperature);
tv_6.setText("旅行指數 ："+weather_travel_index);
tv_7.setText("天氣 ："+weather_wea);
tv_8.setText("星期 ："+weather_week);
tv_9.setText("風力 ："+weather_wind);
}
}
操作結果：
