Android EditText - Delete the last letter with a button

Question

I have to buttons that writes A and B to an edittext. If there is something in the edittext how can I delete the last letters with the \"Del\" button? My layout:

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Answer 1

String text = editText.getText().toString();
if(text.length() > 0){
  text = str.substring(0, str.length()-1);
   editText.setText(text);
}