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Android AutoCompleteTextView

Android AutoCompleteTextView Tutorial and Example

Validating Email Address using Regex

import android.text.util.Rfc822Tokenizer;
import android.widget.AutoCompleteTextView.Validator;

import java.util.regex.Pattern;

public class EmailAddressValidator implements Validator {
    private static final Pattern EMAIL_ADDRESS_PATTERN = Pattern.compile(
          "[a-zA-Z0-9+._%-]{1,256}" +
          "@" +
          "[a-zA-Z0-9][a-zA-Z0-9-]{0,64}" +
          "(" +
          "." +
          "[a-zA-Z0-9][a-zA-Z0-9-]{0,25}" +
          ")+"
      );

    public CharSequence fixText(CharSequence invalidText) {
        return "";
    }

    public boolean isValid(CharSequence text) {
        return Rfc822Tokenizer.tokenize(text).length > 0;
    }

    public boolean isValidAddressOnly(CharSequence text) {
        return EMAIL_ADDRESS_PATTERN.matcher(text).matches();
    }
}
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