EditText edittext = (EditText) findViewById(R.id.youredittext);
edittext.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) { }
public void beforeTextChanged(CharSequence s, int start, int count, int after) { }
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.toString().contains("
")) {
//Action here
}
}
});