如何遍历Android中的Firebase结构？

正如@ReazMurshed所说的，您快到了。但是您无法在树中迭代一个级别。似乎ref指向

subscriptions

ref.addListenerForSinglevalueEvent(new ValueEventListener) {  public void onDataChange(DataSnapshot snapshot) {    if (dataSnapshot.exists()) {      for (DataSnapshot userSnapshot : snapshot.getChildren()) {        for (DataSnapshot programSnapshot : userSnapshot.getChildren()) {          Program program = programSnapshot.getValue(Program.class);      }    }  }  public void onCancelled(FirebaseError firebaseError) {  }});