（android学习）使用Gson解析json
使用Gson解析json格式的数据
一、添加依赖：
compile
'com.google.code.gson:gson:2.8.1'
二、Gson的简单使用
1.新建一个实体类（person）
public class Person {
private String
name;
private int age;
private String
sex;
private String
tel;
public Person(String name, int age, String sex, String tel) {
this.name = name;
this.age = age;
this.sex = sex;
this.tel = tel;
}
2.添加数据源（person对象）
public class MainActivity
extends AppCompatActivity {
private static final String
TAG = "MainActivity";
private List<Person>
Data;
private List<Person>
newData;
@Override
protected void
onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Person person1 = new Person("Jim",24,"boy","123456789");
Person person2 = new Person("Jane",25,"girl","897654321");
Person person3 = new Person("Tom",24,"boy","564789123");
Person person4 = new Person("Jack",23,"boy","0123456926");
Person person5 = new Person("lucy",27,"boy","98156123156");
Data = new ArrayList<>();
Data.add(person1);
Data.add(person2);
Data.add(person3);
Data.add(person4);
Data.add(person5);
3.Gson的使用
String jsonString = new Gson().toJson(Data); //将存有person对象的list转为json格式的数据
Log.d(TAG,
"onCreate: jsonString = " + jsonString);
newData =
new Gson().fromJson(jsonString,new TypeToken<List<Person>>(){}.getType() );
//将json格式数据解析为person对象list，打印出log
for (Person person:newData) {
Log.d(TAG,
"onCreate: \nname:" + person.getName() +
"\n
age:" + person.getAge()
+ "\n
sex:" + person.getSex() + "\n
tel:" + person.getTel());
}
}
}
输出结果如下：
MainActivity: onCreate: jsonString = [{"age":24,"name":"Jim","sex":"boy","tel":"123456789"},{"age":25,"name":"Jane","sex":"girl","tel":"897654321"},{"age":24,"name":"Tom","sex":"boy","tel":"564789123"},{"age":23,"name":"Jack","sex":"boy","tel":"0123456926"},{"age":27,"name":"lucy","sex":"boy","tel":"98156123156"}]
Gson().toJson(Data);
Gson().toJson(Data);