[Android] how to check edittext's text is email address or not? (轉貼)

reference: http://stackoverflow.com/questions/6119722/how-to-check-edittexts-text-is-email-address-or-not

/** 
 * method is used for checking valid email id format. 
 *  
 * @param email 
 * @return boolean true for valid false for invalid 
 */ 
public static boolean isEmailValid(String email) {
    boolean isValid = false;
 
    String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";
    CharSequence inputStr = email;
 
    Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(inputStr);
    if (matcher.matches()) {
        isValid = true;
    } 
    return isValid;
}