[英]DataSnapshot Firebase: Getvalue return null
I try to read the user's data from Firebase Realtime Database but it always returns null. 我尝试从Firebase实时数据库读取用户的数据,但它始终返回null。 Here is my code:
这是我的代码:
final FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference ref = database.getReference();
ref.child("shop").child("Users").child(mAuth.getCurrentUser().getUid()).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Users user = dataSnapshot.getValue(Users.class);
}
@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.w("1abc", "Failed to read value.", error.toException());
}
});
Here is the Users class: 这是Users类:
public class Users {
private String full_name;
private String UID;
private String email;
public Users(String newemail, String newUID, String newfull_name) {
// ...
this.email=newemail;
this.full_name=newfull_name;
this.UID=newUID;
}
public Users() {
// ...
}
}
And here is my database tree: 这是我的数据库树:
Can someone tell me where am i wrong? 有人可以告诉我我错了吗? Thanks in advance.
提前致谢。
You need to add getters and setters in your POJO class: 您需要在POJO类中添加getter和setter:
public class Users {
private String full_name;
private String UID;
private String email;
public Users(String newemail, String newUID, String newfull_name) {
// ...
this.email=newemail;
this.full_name=newfull_name;
this.UID=newUID;
}
public Users() {
// ...
}
public String getFull_name() {
return full_name;
}
public void setFull_name(String full_name) {
this.full_name = full_name;
}
public String getUID() {
return UID;
}
public void setUID(String UID) {
this.UID = UID;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
make Users model members public ! 使用户模型成员公开!
public class Users {
public String full_name;
public String UID;
public String email;
public Users(String newemail, String newUID, String newfull_name) {
// ...
this.email=newemail;
this.full_name=newfull_name;
this.UID=newUID;
}
public Users() {
// ...
}
}
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