当我调试此代码时,在databaseUser dataSnapshot中有来自用户在数据库中的值,但在对象user1
中没有添加,它全为空。我不明白,因为在对象事件中正常接收值。如何从dataSnapshot获取价值?
databaseEvent.child(getKeyEvent()).addListenerForSingleValueEvent(
new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
final Event event = dataSnapshot.getValue(Event.class);
user = FirebaseAuth.getInstance().getCurrentUser();
if(user != null) {
databaseUser.orderByChild("userEmail").equalTo(user.getEmail()).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
//User already exists
User user1 = dataSnapshot.getValue(User.class);
}
}
});
我的数据库用户,只为测试现在:
public class User {
String userId;
String userEmail;
Boolean userHasInterest;
String eventId;
public String getUserId() {
return userId;
}
public String getUserEmail() {
return userEmail;
}
public Boolean getUserHasInterest() {
return userHasInterest;
}
public String getEventId() {
return eventId;
}
public User(String userId, String eventId, String userEmail, Boolean userHasInterest) {
this.userId = userId;
this.userEmail = userEmail;
this.userHasInterest = userHasInterest;
this.eventId = eventId;
}
与方法,只是挑另一个活动的事件的关键:
public String getKeyEvent(){
Intent intent = getIntent();
Bundle bundle = intent.getExtras();
String key = bundle.getString("Evento");
return key;
}
添加数据库结构并说明getKeyEvents()是什么 –
此代码是否工作?您在范围内有'dataSnapshot'重叠的值 –