Android, add a condition to my button (SMS app)

I have made an SMS app (I'm a newbie). When the user press a button a message will be sent to a number where the user types in. That goes okay! but when there there is no number (Textview is empty) the app crashes. So i tried adding a condition to when the Textview is empty send a Toast, if it is not empty send message, here my code. I tried diffrent ways but the body in Else is activated anyway? Hope someone can help me :).

sendSMSa2 is my button. nyanumtxt is where the number is.

sendSMSa2.setOnClickListener(new View.OnClickListener() {
                                                 @Override
                                                 public void onClick(View v) {


                                                      if(nyanumtxt.getText().toString().isEmpty()) {

                                                         Toast.makeText(getActivity(), "No Number chossen",
                                                                 Toast.LENGTH_LONG).show();

                                                       

                                                     } else {


                                                     String myMsgrela1 = a2txt.getText().toString();
                                                     String theNumberr = nyanumtxt.getText().toString();
                                                     sendMsg(theNumberr, myMsgrela1);
                                                     Toast.makeText(getActivity(), "Message sent!",
                                                             Toast.LENGTH_LONG).show();
                                                 }

                                             }
                                             }
                );