android JSON解析数据-解析天气预报

#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() {                    @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"?>

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