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}";

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
   private Button button = null;
   private String jsonData = "{\"name\":\"Michael\",\"age\":20}";

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button = (Button)findViewById(R.id.buttonId);
        button.setOnClickListener(new ButtonListener());
    }
    
    private class ButtonListener implements OnClickListener{       
        public void onClick(View v){
            JsonUtils jsonUtils = new JsonUtils();
            jsonUtils.pareseUserFromJson(jsonData);
        }
    }
    
    
}

public class User {    
    private String name;
    private String age;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
}

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}]";

public class MainActivity extends Activity {
   private Button button = null;
   private String jsonData = "[{\"name\":\"Michael\",\"age\":20},{\"name\":\"Mike\",\"age\":21}]";

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button = (Button)findViewById(R.id.buttonId);
        button.setOnClickListener(new ButtonListener());
    }
    
    private class ButtonListener implements OnClickListener{       
        public void onClick(View v){
            JsonUtils jsonUtils = new JsonUtils();
            jsonUtils.pareseUserFromJson(jsonData);
        }
    }
    
    
}

public class User {    
    private String name;
    private String age;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
}

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