public Sender(long number){
_phoneNumber = number;
String fireBaseURL = "https://signal-app.firebaseio.com/users/"+_phoneNumber+"/sent";
final Firebase ref = new Firebase(fireBaseURL);
ref.addChildEventListener(new ChildEventListener(){
@Override
public void onCancelled(){
}
@Override
public void onChildAdded(DataSnapshot snapshot, String arg1) {
final String messageKey = snapshot.getName();
GenericTypeIndicator<Map<String, Object>> t = new GenericTypeIndicator<Map<String, Object>>(){};
final Map<String,Object> message = snapshot.getValue(t);
String findFollowersURL = "https://signal-app.firebaseio.com/users/"+_phoneNumber;
Firebase followers = new Firebase(findFollowersURL);
followers.addChildEventListener(new ChildEventListener(){
@Override
public void onCancelled() {
}