在HashMap实现中获取空对象
在HashMap实现中获取空对象
提问于 2018-03-30 23:20:05
我正在尝试从HashMap中获取值，但是当我调用他和setText时，我总是会得到Null值，让我展示一下代码：
MyValues.class
private List<ItemsBean> items;
public List<ItemsBean> getItems() { return items;}
public void setItems(List<ItemsBean> items) { this.items = items; }
public static class ItemsBean {
private Map<String, leakBean> Gitt;
public Map<String, leakBean> getGitt() { return Gitt;}
public void setGitt(Map<String, leakBean> Gitt) { this.Gitt = Gitt;}
public static class leakBean {
private int id;
private String dev;
public int getId() {return id; }
public String getDev(){return dev;}
public void setId(int id) { this.id = id;}
public void setDev(String dev){this.dev = dev;}
}我使用Gson来获取值，并将其用于.setText或Toast，尝试这样访问：
MyValues object;
txt1.setText(String.valueOf( object.getItems().get(0).getGitt().get("id")));我现在空了，有人能帮我吗？我只需要访问值，也可以访问items.size()；返回1并必须返回3
这里是：
{
"id": 1001,
"name": "Super1",
"user": {
"name": "The Super 1"
},
"items": [
{
"987987M7812b163eryrt": {
"id": 1,
"dev": "seed"
},
"90812bn120893juuh": {
"id": 2,
"dev": "none"
},
"981273jn19203nj123rg": {
"id": 3,
"dev": "mine"
}
}
]}回答 1
Stack Overflow用户
回答已采纳
发布于 2018-03-30 23:36:09
尝试使用这些POJO：
MyValues.java公共类MyValues {
private int id;
private String name;
private User user;
private List<HashMap<String, ItemsBean>> items;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<HashMap<String, ItemsBean>> getItems() {
return items;
}
public void setItems(List<HashMap<String, ItemsBean>> items) {
this.items = items;
}
}User.java公共类用户{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}ItemsBean.java公共类ItemsBean {
private int id;
private String dev;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getDev() {
return dev;
}
public void setDev(String dev) {
this.dev = dev;
}
}您不能访问这样的值：
object.getItems().get(0).get("987987M7812b163eryrt").getId();页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/49582630
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