android中—–JSON例子一、 二

JSON例子一  

MainActivity.java中 核心代碼

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();//第一個參數是一個Json資料//第二個參數指定這個資料轉換成哪個類的對象User user = gson.fromJson(jsonData, User.class);System.out.println("name--->" + user.getName());System.out.println("age--->" + user.getAge());}}

 完整代碼見下載    _19_json02.rar

　　

 

JSON例子二

MainActivity.java中 核心代碼

 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數群組轉換成一系列的User對象，那要怎麼做？ * */public class JsonUtils {public void pareseUserFromJson(String jsonData){ //此處TypeToken<LinkedList<User>>(){}為何有個大括弧，因為他是個介面，但又沒有要實現的類Type listType = new TypeToken<LinkedList<User>>(){}.getType();Gson gson = new Gson();//LinkedList 增刪操作較多而查詢操作很少的情況下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());}}}

　　

  完整代碼見下載   _19_json03.rar