How to validate EmailId field in Android?

We use regular expressions along with Pattern & Matcher classes and their methods to validate email address

Required regular expression is  as below:

String regExpn = m:val="0"m:val="0"m:val="centerGroup"m:val="1440"m:val="subSup"m:val="undOvr"

"^(([\\w-]+\\.)+[\\w-]+|([a-zA-Z]{1}|[\\w-]{2,}))@"

    +"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"

      +"[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\."

      +"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"

      +"[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"

      +"([a-zA-Z]+[\\w-]+\\.)+[a-zA-Z]{2,4})$";

Validation code goes as below:

private Boolean isValidEmail(String inputEmail)

{

      Pattern patternObj = Pattern.compile(regExpn);

      Matcher matcherObj = patternObj.matcher(inputEmail/*May be fetched from  EditText. This string is the one which you wanna validate for email*/);

            if (matcherObj.matches())

            {

                  //Valid email id…

                  return true;

}

            Else

{

//not a valid email id…

                  return false;

}

}

Happy coding:-)

How to validate all EditText in Android Layout?

private boolean validate() {
final int childrenCount = root.getChildCount();
for (int i = 0; i < childrenCount; i++) {
View child = root.getChildAt(i);
if (child instanceof EditText) {
if (TextUtils.isEmpty(((EditText) child).getText().toString()))
return false;
}
}
return true;
}

How to validate the Password Field to be alphaNumeric in android?

You just need to pass the password string in following method.........


public boolean containAlphanumeric(final String str) {
byte counter = 0;
boolean checkdigit = false, checkchar = false;
for (int i = 0; i < str.length() && counter < 2; i++) {
   // If we find a non-digit character we return false.
   if (!checkdigit && Character.isDigit(str.charAt(i))) {
checkdigit = true;
counter++;
   }
   String a = String.valueOf(str.charAt(i));
   if (!checkchar && a.matches("[a-zA-Z]*")) {
checkchar = true;
counter++;
   }
}
if (checkdigit && checkchar) {
   return true;
}
return false;
    }