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android JSON解析数据 android解析天气预报

2019-12-12 03:14:12
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概要

笔者近期做到对天气预报JSON数据解析,在此小记。

天气预报接口:http://wthrcdn.etouch.cn/weather_mini?citykey=101200101

JSON数据如下:

{ "desc": "OK", "status": 1000, "data": { "wendu": "14", "ganmao": "天气转凉,空气湿度较大,较易发生感冒,体质较弱的朋友请注意适当防护。", "forecast": [  {  "fengxiang": "无持续风向",  "fengli": "微风级",  "high": "高温 17℃",  "type": "小雨",  "low": "低温 10℃",  "date": "30日星期四"  },  {  "fengxiang": "无持续风向",  "fengli": "微风级",  "high": "高温 18℃",  "type": "多云",  "low": "低温 7℃",  "date": "31日星期五"  },  {  "fengxiang": "无持续风向",  "fengli": "微风级",  "high": "高温 20℃",  "type": "晴",  "low": "低温 8℃",  "date": "1日星期六"  },  {  "fengxiang": "无持续风向",  "fengli": "微风级",  "high": "高温 23℃",  "type": "晴",  "low": "低温 10℃",  "date": "2日星期天"  },  {  "fengxiang": "无持续风向",  "fengli": "微风级",  "high": "高温 23℃",  "type": "多云",  "low": "低温 12℃",  "date": "3日星期一"  } ], "yesterday": {  "fl": "微风",  "fx": "无持续风向",  "high": "高温 21℃",  "type": "阴",  "low": "低温 12℃",  "date": "29日星期三" }, "aqi": "114", "city": "武汉" }}

最终解析效果:

解析概述

1、首先,接到的整个数据可以转化为JSONObject对象。
2、通过整个数据的JSONObject对象获取到data中的数据,也是一个JSONObject对象。在data中就可以获取到此时温度,以及城市等信息。
3、通过data的JSONObject对象可以获取到forecast中的数据,forecast中的数据则是一个JSONArray对象。
4、通过forecast的JSONArray对象可以获取到近几天的天气信息,每一条为一个JSONObject对象。

代码

方便起见,笔者使用了volley框架,读者新建项目需要在build.gradle的dependencies中添加如下:

compile 'eu.the4thfloor.volley:com.android.volley:2015.05.28'

MainActivity.java:

package com.example.double2.jsontext;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.widget.TextView;import com.android.volley.RequestQueue;import com.android.volley.Response;import com.android.volley.VolleyError;import com.android.volley.toolbox.JsonObjectRequest;import com.android.volley.toolbox.Volley;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;public class MainActivity extends AppCompatActivity { private TextView tvMain; private RequestQueue mRequestQueue; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { tvMain = (TextView) findViewById(R.id.tv_main); mRequestQueue = Volley.newRequestQueue(this); JsonObjectRequest mJsonObjectRequest = new JsonObjectRequest(  "http://wthrcdn.etouch.cn/weather_mini?citykey=101200101",  null,  new Response.Listener<JSONObject>() {   @Override   public void onResponse(JSONObject response) {   try {    JSONObject data = new JSONObject(response.getString("data"));    JSONArray forecast = data.getJSONArray("forecast");    JSONObject todayWeather = forecast.getJSONObject(0);    String wendu = data.getString("wendu") + "/n";    String ganmao = data.getString("ganmao") + "/n";    String high = todayWeather.getString("high") + "/n";    String low = todayWeather.getString("low") + "/n";    String date = todayWeather.getString("date") + "/n";    String city = data.getString("city") + "/n";    tvMain.setText(wendu + ganmao + high + low + date+city);   } catch (JSONException e) {    e.printStackTrace();   }   }  }, new Response.ErrorListener() {  @Override  public void onErrorResponse(VolleyError error) {  Log.e("TAG", error.getMessage(), error);  } }); mRequestQueue.add(mJsonObjectRequest); }}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="10dp" > <TextView android:id="@+id/tv_main" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" /></LinearLayout>

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