maybe you need the TextChangedListener
(or use it as alternative method):
TextWatcher textWatcher = new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
public void onTextChanged(CharSequence s, int start, int before,int count) {
}
public void afterTextChanged(Editable s) {
}
};
editText.addTextChangedListener(textWatcher);