--- title: "Validation is not working and move to next activity in android" description: "Validation is not working and move to next activity in android" author: "Anonymous User" published: 2014-10-19 updated: 2014-10-19 canonical: https://www.mindstick.com/forum/2417/validation-is-not-working-and-move-to-next-activity-in-android category: "android" tags: ["android", "validation"] reading_time: 6 minutes --- # Validation is not working and move to next activity in android Hi In My [Application](https://www.mindstick.com/articles/12824/calculator-application-in-android) I have [username and password](https://www.mindstick.com/forum/160407/how-does-a-bearer-token-differ-from-other-authentication-methods-such-as-username-and-password) and login button.click the login [submit button](https://www.mindstick.com/forum/12834/make-text-appear-when-submit-button-clicked-and-checkbox-is-unchecked) without checking validations and empty [fields](https://www.mindstick.com/forum/159126/sql-query-for-all-tables-and-fields-in-an-oracle-db) also moving to next [activity](https://www.mindstick.com/forum/12894/how-to-force-recreation-of-activity-fragment-on-restore). I want to [check whether](https://www.mindstick.com/forum/157543/write-a-java-program-to-check-whether-a-string-is-a-palindrome) the username is [required](https://www.mindstick.com/forum/160269/what-is-required-data-annotation-how-does-it-affect-model-validation) and password required clicking login button move to next activity. ## Login.java ``` public class Login extends Activity { Button login; private static final Pattern USERNAME_PATTERN = Pattern .compile("[a-zA-Z0-9]{1,250}"); private static final Pattern PASSWORD_PATTERN = Pattern .compile("[a-zA-Z0-9+_.]{4,16}"); EditText usname,pword; TextView tv; String result=null; HttpPost httppost; StringBuffer buffer; HttpResponse response; HttpClient httpclient; CheckBox mCbShowPwd; List nameValuePairs; ProgressDialog dialog = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); login = (Button)findViewById(R.id.login); usname = (EditText)findViewById(R.id.username); pword= (EditText)findViewById(R.id.password); mCbShowPwd = (CheckBox) findViewById(R.id.cbShowPwd); mCbShowPwd.setOnCheckedChangeListener(new OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // checkbox status is changed from uncheck to checked. if (!isChecked) { // show password usname.setTransformationMethod(PasswordTransformationMethod.getInstance()); } else { // hide password pword.setTransformationMethod(HideReturnsTransformationMethod.getInstance()); } } }); login.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { final String username = usname.getText().toString(); final String password = pword.getText().toString(); if (username.equals("") || password.equals("")) { if (username.equals("")) { Toast.makeText(Login.this, "ENTER USERNAME", Toast.LENGTH_LONG).show(); } if (password.equals("")) { Toast.makeText(Login.this, "ENTER PASSWORD", Toast.LENGTH_LONG).show(); } } else { if (!CheckUsername(username)) { Toast.makeText(Login.this, "ENTER VALID USERNAME", Toast.LENGTH_LONG).show(); } if (!CheckPassword(password)) { Toast.makeText(Login.this, "ENTER VALID PASSWORD", Toast.LENGTH_LONG).show(); } } final String queryString = "username=" + username + "&password=" + password; String result = DatabaseUtility.executeQueryPhp("login",queryString); Intent i = new Intent(getApplicationContext(), Home.class); startActivity(i); } }); } private boolean CheckPassword(String password) { return PASSWORD_PATTERN.matcher(password).matches(); } private boolean CheckUsername(String username) { return USERNAME_PATTERN.matcher(username).matches(); } ``` ## Replies ### Reply by Anonymous User Use this to check [username](https://www.mindstick.com/forum/12798/there-is-no-viewdata-item-of-type-ienumerable-selectlistitem-that-has-the-key-username) and same way check [password](https://www.mindstick.com/blog/118/retriving-user-password-by-using-stored-procedure-in-asp-dot-net)\ ``` public static boolean isValidUsername(EditText ed) { boolean isValidUsername = true; if (ed != null) { Pattern r = Pattern.compile(USERNAME_PATTERN); String s = ed.getText().toString().trim(); String s1 = s.toString(); Matcher m = r.matcher(s1); if (m.find()) { ed.setError("You are allowed to use a-z, A-Z, 0-9, ***") // *** are your other possible symbols isValidUsername = false; } else if (s.length() < 5) { ed.setError("Atleast five characters must be there in username"); isValidUsername = false; } } return isValidUsername;} ``` And now\ ``` if(editetxt_username.isValidUsernam() && editetxt_password.isValidPassword()) { //Change to new activity here} ``` ### Reply by Anonymous User ``` login.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { final String username = usname.getText().toString(); final String password = pword.getText().toString(); if (username.equals("") || password.equals("")) { if (username.equals("")) { Toast.makeText(Login.this, "ENTER USERNAME", Toast.LENGTH_LONG).show(); } if (password.equals("")) { Toast.makeText(Login.this, "ENTER PASSWORD", Toast.LENGTH_LONG).show(); } } else if (!CheckUsername(username) && !CheckPassword(password)){ Toast.makeText(Login.this, "ENTER VALID USERNAME & PASSWORD", Toast.LENGTH_LONG).show(); }else{ Intent i = new Intent(getApplicationContext(), Home.class); startActivity(i); } } }); ``` --- Original Source: https://www.mindstick.com/forum/2417/validation-is-not-working-and-move-to-next-activity-in-android Copyright © MindStick Software Pvt. 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