Android中生成、使用Json数据实例

package com.example.usingjson2; 
 
import org.json.JSONException; 
import org.json.JSONObject; 
 
import android.os.Bundle; 
import android.app.Activity; 
 
public class MainActivity extends Activity { 
 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
         
        System.out.println("\"Hello World\""); 
        JSONObject object = new JSONObject(); 
         
        try { 
            object.put("one", "yu"); 
            object.put("two", "xi"); 
            object.put("three", "kuo"); 
            object.put("four", "hi"); 
            System.out.println(object); 
             
        } catch (JSONException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
         
    } 
}

package com.example.useingjson;

 

public class Data {
 
 public static final String jsonStr = "{'arr':[1,2,3,4],'dat':[yu,xi,kuo]}";
}

package com.example.useingjson;

 

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.Bundle;
import android.app.Activity;

public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  System.out.println(Data.jsonStr);
  
  try {
   JSONObject jsonObject = new JSONObject(Data.jsonStr);
   JSONArray jsonArray = jsonObject.getJSONArray("arr");
   System.out.println(jsonArray);
   
   for(int i = 0; i < jsonArray.length(); i++)
   {
    System.out.println(jsonArray.get(i));
   }
   
   JSONArray jsonArray2 = jsonObject.getJSONArray("dat");
   System.out.println(jsonArray2);
   for(int j = 0; j < jsonArray2.length(); j++)
   {
    System.out.println(jsonArray2.get(j));
   }
   
  } catch (JSONException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } 
 }
}