android中-----JSON例子一、 二

JSON例子一  

MainActivity.java中 核心代码

private String jsonData = "{\"name\":\"Michael\",\"age\":20}";

 

MainActivity.java

 1 import android.app.Activity;

 2 import android.os.Bundle;

 3 import android.view.View;

 4 import android.view.View.OnClickListener;

 5 import android.widget.Button;

 6 

 7 public class MainActivity extends Activity {

 8    private Button button = null;

 9    private String jsonData = "{\"name\":\"Michael\",\"age\":20}";

10 

11     public void onCreate(Bundle savedInstanceState) {

12         super.onCreate(savedInstanceState);

13         setContentView(R.layout.main);

14         button = (Button)findViewById(R.id.buttonId);

15         button.setOnClickListener(new ButtonListener());

16     }

17     

18     private class ButtonListener implements OnClickListener{       

19         public void onClick(View v){

20             JsonUtils jsonUtils = new JsonUtils();

21             jsonUtils.pareseUserFromJson(jsonData);

22         }

23     }

24     

25     

26 }

 

 

 

User.java

 1 public class User {    

 2     private String name;

 3     private String age;

 4 

 5     public String getName() {

 6         return name;

 7     }

 8     public void setName(String name) {

 9         this.name = name;

10     }

11     public String getAge() {

12         return age;

13     }

14     public void setAge(String age) {

15         this.age = age;

16     }

17 }

 

 

JsonUtils.java

import com.google.gson.Gson;



public class JsonUtils {

	public void pareseUserFromJson(String jsonData){

		Gson gson = new Gson();

		//第一个参数是一个Json数据

		//第二个参数指定这个数据转换成哪个类的对象

		User user = gson.fromJson(jsonData, User.class);

		System.out.println("name--->" + user.getName());

		System.out.println("age--->" + user.getAge());

	}

}

 完整代码见下载    _19_json02.rar

　　

 

JSON例子二

MainActivity.java中 核心代码

 private String jsonData = "[{\"name\":\"Michael\",\"age\":20},{\"name\":\"Mike\",\"age\":21}]";

 

MainActivity.java

 1 public class MainActivity extends Activity {

 2    private Button button = null;

 3    private String jsonData = "[{\"name\":\"Michael\",\"age\":20},{\"name\":\"Mike\",\"age\":21}]";

 4 

 5     public void onCreate(Bundle savedInstanceState) {

 6         super.onCreate(savedInstanceState);

 7         setContentView(R.layout.main);

 8         button = (Button)findViewById(R.id.buttonId);

 9         button.setOnClickListener(new ButtonListener());

10     }

11     

12     private class ButtonListener implements OnClickListener{       

13         public void onClick(View v){

14             JsonUtils jsonUtils = new JsonUtils();

15             jsonUtils.pareseUserFromJson(jsonData);

16         }

17     }

18     

19     

20 }

 

User.java

 1 public class User {    

 2     private String name;

 3     private String age;

 4 

 5     public String getName() {

 6         return name;

 7     }

 8     public void setName(String name) {

 9         this.name = name;

10     }

11     public String getAge() {

12         return age;

13     }

14     public void setAge(String age) {

15         this.age = age;

16     }

17 }

 

JsonUtils.java

/**

 * 但如果要把JSON数组转换成一系列的User对象，那要怎么做？

 *

 */

public class JsonUtils {

	public void pareseUserFromJson(String jsonData){

		 //此处TypeToken<LinkedList<User>>(){}为何有个大括号，因为他是个接口，但又没有要实现的类

		

		Type listType = new TypeToken<LinkedList<User>>(){}.getType();

		Gson gson = new Gson();		//LinkedList 增删操作较多而查询操作很少的情况下

		LinkedList<User> users = gson.fromJson(jsonData,listType);

		for(Iterator iterator = users.iterator(); iterator.hasNext();){

			User user = (User)iterator.next();

			System.out.println("name--->" + user.getName());

			System.out.println("age--->" + user.getAge());

			

		}

	}

}

　　

  完整代码见下载   _19_json03.rar