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

posted on 2012-05-02 21:51 Code大蛇丸阅读(602) 评论(0) 编辑收藏举报

android中-----JSON例子一、 二

android中-----JSON例子一、二