Android Studio如何从Firebase推送中获取ID

Question

I've done this push:

 mDatabaseReference = FirebaseDatabase.getInstance().getReference();
 mDatabaseReference.child(TipoAnuncio).push().setValue(fichaPet);

(Where fichaPet is a ad's class which is pushed in other object from firebase database)

My BBDD:

Users Firebase Database

I wanna get push's ID to write inside Ads from Users of FirebaseDatabase, and do something like this:

 mDatabaseReference.child("Usuarios").child(userId).child("Ads").push().setValue(mDatabaseReference.child("Usuarios").child(userId).child("Ads").push().getKey());

but it doesn't get previously ID from previously ad published. Thanks!!! :)

Answer 1

To solve this, please use the following code:

mDatabaseReference = FirebaseDatabase.getInstance().getReference();
DatabaseReference tipoAnuncioRef = mDatabaseReference.child(TipoAnuncio);
String key = tipoAnuncioRef.push().getKey(); //This is the value of your key
tipoAnuncioRef.child(key).setValue(fichaPet);

If you are using the push() methid again, a new id will be generated and there is no need for that.