Real time validation (before button click)

Question

Is there any way to validate EditText fields in real time, before the user clicks a button.

For example, if I have

if (password.length() < 6) {
    passwordwrapper.setError("Password must have at least 6 characters");
    return;
}

and

if (!validateEmail(email)) {
    emailwrapper.setError("Invalid email");
    return;
}

with the validateEmail method being

private static final String EMAIL_PATTERN = "^[a-zA-Z0-9#_~!$&'()*+,;=:.\"(),:;<>@\\[\\]\\\\]+@[a-zA-Z0-9-]+(\\.[a-zA-Z0-9-]+)*$";
private Pattern pattern = Pattern.compile(EMAIL_PATTERN);
private Matcher matcher;

public boolean validateEmail(String email) {
    matcher = pattern.matcher(email);
    return matcher.matches();
}

How would I setup a TextWatcher or something else to validate it real time?

Answer 1

can you try

Field1 = (EditText)findViewById(R.id.field1);


Field1.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) {

   }
  });