Android中生成、使用Json数据实例

2020-04-11 11:42:41

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1、Json的制作

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();  
        }  
          
    }  
}

2、Json的使用

（1）首先在当前包中创建新的class

复制代码代码如下:

package com.example.useingjson;

public class Data {

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

（2）在Activity中调用

复制代码代码如下:

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();
  }
}
}