android JSON解析数据 android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<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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