Android解析聚合数据之天气预报

免费天气预报API：https://www.juhe.cn/docs/api/id/73



MainActivity.java

<span style="font-size:14px;">package com.example.networktest;  
   
import java.io.BufferedReader;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.net.HttpURLConnection;  
import java.net.MalformedURLException;  
import java.net.URL;  
import java.net.URLEncoder;  
   
import org.json.JSONArray;  
import org.json.JSONException;  
import org.json.JSONObject;  
   
import android.app.Activity;  
import android.os.Bundle;  
import android.os.Handler;  
import android.os.Message;  
import android.util.Log;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.TextView;  
   
public class MainActivity extends Activity {  
    private Button sendRequest;  
    private TextView responseText;  
    public static final int SHOW_RESPONSE = 0;  
    private Handler handler = new Handler() {  
   
        public void handleMessage(Message msg) {  
            switch (msg.what) {  
            case SHOW_RESPONSE:  
                String response = (String) msg.obj;  
                // 在这里进行UI操作，将结果显示到界面上  
                responseText.setText(response);  
            }  
        }  
   
    };  
   
    @Override 
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        sendRequest = (Button) findViewById(R.id.send_request);  
        responseText = (TextView) findViewById(R.id.response);  
        sendRequest.setOnClickListener(new OnClickListener() {  
            @Override 
            public void onClick(View arg0) {  
                sendRequestWithHttpURLConnection();  
            }  
        });  
    }  
   
    protected void sendRequestWithHttpURLConnection() {  
        new Thread() {  
            @Override 
            public void run() {  
                URL url;  
                HttpURLConnection connection = null;  
                try {  
                    // url = new  
                    // URL("http://10.2.5.119:8080/Server/getData.json");  
                    String cityName = URLEncoder.encode("滨州", "utf-8");  
                    url = new URL(  
                            "http://v.juhe.cn/weather/index?format=2&cityname=" 
                                    + cityName  
                                    + "&key=ab9d7e2007472d723baf71fcdc4ba094");  
                    connection = (HttpURLConnection) url.openConnection();  
                    connection.setRequestMethod("GET");  
                    connection.setConnectTimeout(8000);  
                    connection.setReadTimeout(8000);  
                    InputStream in = connection.getInputStream();  
                    // 下面对获取到的输入流进行读取  
                    BufferedReader reader = new BufferedReader(  
                            new InputStreamReader(in));  
                    StringBuilder response = new StringBuilder();  
                    String line;  
                    while ((line = reader.readLine()) != null) {  
                        response.append(line);  
                    }  
                    System.out.println("response=" + response.toString());  
                    //parseWithJSON(response.toString());  
                    parseWeatherWithJSON(response.toString());  
                    Message message = new Message();  
                    message.what = SHOW_RESPONSE;  
                    // 将服务器返回的结果存放到Message中  
                    message.obj = response.toString();  
                    handler.sendMessage(message);  
                } catch (MalformedURLException e) {  
                    e.printStackTrace();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                } finally {  
                    if (connection != null) {  
                        connection.disconnect();  
                    }  
                }  
            }  
        }.start();  
   
    }  
   
    protected void parseWeatherWithJSON(String response) {  
        try {  
            JSONObject jsonObject=new JSONObject(response);  
            String resultcode=jsonObject.getString("resultcode");  
            if(resultcode.equals("200")){  
                JSONObject resultObject=jsonObject.getJSONObject("result");  
                JSONObject todayObject=resultObject.getJSONObject("today");  
                String date_y=todayObject.getString("date_y");  
                String week=todayObject.getString("week");  
                String temperature=todayObject.getString("temperature");  
                Log.d("MainActivity", "date_y="+date_y+"week="+week+"temp="+temperature);  
            }  
               
        } catch (JSONException e) {  
            e.printStackTrace();  
        }  
    }  
   
    protected void parseWithJSON(String response) {  
        try {  
            JSONArray jsonArray = new JSONArray(response);  
            for (int i = 0; i < jsonArray.length(); i++) {  
                JSONObject jsonObject = jsonArray.getJSONObject(i);  
                String id = jsonObject.getString("id");  
                String name = jsonObject.getString("name");  
                String version = jsonObject.getString("version");  
                Log.d("MainActivity", "id=" + id + "name=" + name + "version=" 
                        + version);  
            }  
        } catch (JSONException e) {  
            e.printStackTrace();  
        }  
    }  
   
}</span>

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" >  
    <Button 
        android:id="@+id/send_request" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:text="Send Request" />  
    <ScrollView 
        android:layout_width="match_parent" 
        android:layout_height="match_parent" >  
        <TextView 
            android:id="@+id/response" 
            android:layout_width="match_parent" 
            android:layout_height="wrap_content" />  
    </ScrollView>  
</LinearLayout>