android中-----JSON例子一、 二
16lz
2021-01-24
JSON例子一
MainActivity.java中核心代码
private String jsonData = "{\"name\":\"Michael\",\"age\":20}";
MainActivity.java1 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.java1 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
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