Clash Royale CLAN TAG#URR8PPP

How to validate Password Field in android?

Hi I am very new for android and in my app I have Validations for Change password page.

That means the Password must contain minimum 8 characters at least 1 Alphabet, 1 Number and 1 Special Character, for this I tried the code below, but it's not working.

Please help me.

if(!isPasswordValidMethod(newPassword.getText().toString()))
System.out.println("Not Valid");

else

System.out.println("Valid");




// Validate password
private boolean isPasswordValidMethod(String password)

String yourString = newPassword.getText().toString();

System.out.println("yourString is =" + yourString);

boolean isValid = false;

// ^[_A-Za-z0-9-+]+(.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(.[A-Za-z0-9]+)*(.[A-Za-z]2,)$
// ^[\w\.-]+@([\w\-]+\.)+[A-Z]2,4$

String expression = "^(?=.*[A-Za-z])(?=.*\\d)(?=.*[$@$!%*#?&])[A-Za-z\\d$@$!%*#?&]8,$";
CharSequence inputStr = password;

Pattern pattern = Pattern.compile(expression, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(inputStr);
if (matcher.matches())
System.out.println("if");
isValid = true;
else
System.out.println("else");

return isValid;



7 Answers
7

try following Code

//*****************************************************************
public static boolean isValidPassword(final String password)

Pattern pattern;
Matcher matcher;
final String PASSWORD_PATTERN = "^(?=.*[0-9])(?=.*[A-Z])(?=.*[@#$%^&+=!])(?=\S+$).4,$";
pattern = Pattern.compile(PASSWORD_PATTERN);
matcher = pattern.matcher(password);

return matcher.matches();




And change your code to this

if(newPassword.getText().toString().length()<8 &&!isValidPassword(newPassword.getText().toString()))
System.out.println("Not Valid");
else
System.out.println("Valid");



public static boolean isValidPassword(String s)
Pattern PASSWORD_PATTERN
= Pattern.compile(
"[a-zA-Z0-9\!\@\#\$]8,24");

return !TextUtils.isEmpty(s) && PASSWORD_PATTERN.matcher(s).matches();



to use it,

if(isValidPassword(password)) //password valid


You can set whatever symbol that you allowed here

public static boolean passwordCharValidation(String passwordEd)


Try this it works

public static boolean isPasswordValidMethod(final String password)

Pattern pattern;
Matcher matcher;
final String PASSWORD_PATTERN = "^(?=.*[A-Za-z])(?=.*\\d)(?=.*[$@$!%*#?&])[A-Za-z\\d$@$!%*#?&]8,$""
pattern = Pattern.compile(PASSWORD_PATTERN);
matcher = pattern.matcher(password);

return matcher.matches();




String validPassword = "12345";
_Password_String = Password.getText().toString();
Matcher matcher = Pattern.compile(validPassword).matcher(_Password_String);
if (matcher.matches())
Log.e("d11", _Password_String);
Toast.makeText(getActivity(), "Password Match", Toast.LENGTH_LONG).show();
getFragmentManager().popBackStack();


else
Password.setError("Password");
Toast.makeText(getActivity(), "Password not Match", Toast.LENGTH_LONG).show();



easy piece of code for email field validation and password validation and check for minimum 8 characters in password field.

if (isValidEmail(et_regemail.getText().toString())&&etpass1.getText().toString().length()>7)
if (validatePassword(etpass1.getText().toString()))
Toast.makeText(getApplicationContext(),"Go Ahead".....

else

Toast.makeText(getApplicationContext(),"InvalidPassword".....


else

Toast.makeText(getApplicationContext(),"Invalid Email".....



public boolean validatePassword(final String password)
Pattern pattern;
Matcher matcher;
final String PASSWORD_PATTERN = "^(?=.*[0-9])(?=.*[A-Z])(?=.*
[@#$%^&+=!])(?=\S+$).4,$";
pattern = Pattern.compile(PASSWORD_PATTERN);
matcher = pattern.matcher(password);

return matcher.matches();


public final static boolean isValidEmail(CharSequence target)
if (target == null)
return false;

return android.util.Patterns.EMAIL_ADDRESS.matcher(target).matches();



Simple and sort, just use below method for checking valid password,

public static boolean isValidPassword(String password)
Matcher matcher = Pattern.compile("((?=.*[a-z])(?=.*\d)(?=.*[A-Z])(?=.*[@#$%!]).4,20)").matcher(password);
return matcher.matches();



and you can use this method as below

if (!isValidPassword(edtPassword.getText().toString()))
errorDialog("Password must contain mix of upper and lower case letters as well as digits and one special charecter(4-20)");



By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.