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问题描述

这是我的测试结果:





  System.out.println (都是EmailString); 

我发现列出对象的唯一方法是使用firebaseAdapter,还有另一种方法吗?

解决方案

最简单的方法是使用ValueEventListener。

  FirebaseDatabase.getInstance()。getReference()。child(users)
.addListenerForSingleValueEvent(new ValueEventListener(){
@Override
public void onDataChange(DataSnapshot) dataSnapshot){
for(DataSnapshot snapshot:dataSnapshot.getChildren()){
User user = snapshot.getValue(User.class);
System.out.println(user.email);
}
}
@Override
public void onCancelled(DatabaseError databaseError){
}
});


This is what my test looks like:

I won't use the fields above, it's just a dummy. But I would like to go through all the children on "users" and for each email return a:

System.out.println(emailString);

The only way I found of listing an object is using firebaseAdapter, is there another way of doing it?

解决方案

The easiest way is with a ValueEventListener.

    FirebaseDatabase.getInstance().getReference().child("users")
            .addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                        User user = snapshot.getValue(User.class);
                        System.out.println(user.email);
                    }
                }
                @Override
                public void onCancelled(DatabaseError databaseError) {
                }
            });

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10-14 22:45