Validation is not working and move to next activity in android

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Hi In My Application I have username and password and login button.click the login submit button without checking validations and empty fields also moving to next activity.

I want to check whether the username is required 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<NameValuePair> 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();
            }

  1. Post:135

    Points:947
    Re: Validation is not working and move to next activity in android

    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);
                }
             }
          });

      Modified On Apr-06-2018 01:08:22 AM
  1. Post:119

    Points:835
    Re: Validation is not working and move to next activity in android

    Use this to check username and same way check password

    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
    }

      Modified On Apr-06-2018 01:07:08 AM

Answer