Change Password Feature for Open Event Android Organizer App

In Open Event Organizer Android App, the users were able to successfully login and sign up but in case they wanted to change their login password they could not. So, we added a feature to allow users to change their existing password. This blog explains the technical details to implement this feature following MVVM architecture and using highly efficient libraries like Retrofit, RxJava, Raziz Labs DbFlow, Data Binding.


We will implement a page where users can enter their old password and new password along with a confirm password field. Their will be a login button to send the password change request to server. Server then return a response and we will provide feedback regarding the request. We are following MVP architecture so there will be a Model class, Fragment class, Presenter class and Network Layer to make network requests.

Let’s start with creating ChangePassword model class. There are three fields to store old password, new password and new confirmed password. Several Lombok annotations like @Data, @AllArgsConstructor, @NoArgsConstructor are used to avoid boilerplate code for getters, setters and constructors. @JsonNaming annotation is used to translate the Java Object names to KebabCase when they are serialized.

public class ChangePassword {

public String oldPassword;
public String newPassword;

public String confirmNewPassword;

The layout file is binded to model using Data Binding. There will be three TextInputEditText fields for user input. An option to toggle password visibility and a login button.

The Fragment class binds layout file to the Fragment and handle UI stuff. Presenter is called to make Login request when login button is pressed.

public class ChangePasswordFragment extends BaseFragment<ChangePasswordPresenter> implements ChangePasswordView {

public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
binding = DataBindingUtil.inflate(inflater, R.layout.change_password_fragment, container, false);
validator = new Validator(binding);

AppCompatActivity activity = ((AppCompatActivity) getActivity());

ActionBar actionBar = activity.getSupportActionBar();
if (actionBar != null) {

return binding.getRoot();

public void onStart() {

binding.btnChangePassword.setOnClickListener(view -> {
if (!validator.validate())

String url = binding.url.baseUrl.getText().toString().trim();
getPresenter().setBaseUrl(url, binding.url.overrideUrl.isChecked());


When the Login button is pressed, changePasswordRequest() method is called which makes an asynchronous call to ChangePasswordModel in order to perform the task of sending and receiving data from network in a different thread than the UI thread. Along with making requests, this method also verifies the password typed in confirm password field and send the the error as well as success message to the fragment.

public class ChangePasswordPresenter extends AbstractBasePresenter<ChangePasswordView> {

public void changePasswordRequest(String oldPassword, String newPassword, String confirmPassword) {
if (!newPassword.equals(confirmPassword)) {
getView().showError(“Passwords Do Not Match”);


.subscribe(() -> getView().onSuccess(“Password Changed Successfully”), Logger::logError);

We are using Retrofit to make POST Request to server using the REST API. @Body annotation denotes the object request body which here contains a Map<String, ChangePassword> object. The Response from server is captured in Observable<ChangePasswordResponse> which is an RxJava Observable.

Observable<ChangePasswordResponse> changePassword(@Body Map<String, ChangePassword> changePassword);

This is the declaration for the method in Network Layer where the actual network request is made. It takes as input the changePassword object from Presenter which is already binded with data. Then it uses RxJava to asynchronously call the Api class and pass in the Map<String, ChangePassword> object. The result is then processed and Completable object is returned to the presenter. The Presenter processes the Completable object and shows user feedback in the form of a message in SnackBar.


  1. Official documentation for RxJava by ReactiveX
  2. Official documentation for Retrofit by Square Inc
  3. Codebase for Open Event Organizer App on Github
  4. Open Event Server deployment at heroku
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Reset Password Option in SUSI Android App

Login and signup are an important feature for some android apps like chat apps because the user will want to save and secure personal messages from others. In SUSI Android app we provide a token to a logged-in user for a limit period of time so that once the user logs in and someone else gets access to the device, then he/she can’t use the user account for a long period of time. It is a security provided from our side but the user also has to maintain some security. Cyber security risks have increased and hacking technologies have improved a lot in the past 10 years. So, using the same password for a long period of time absolutely puts your account security at risk. So to keep your account secure you should change/reset your password regularly. In this blog post, I will show you how reset password option is implemented in SUSI Android app.

Layout design for reset password

Reset password option is added in the setting. When the user clicks on reset password option a dialog box pops up. There are three textinputlayout boxes – each for the current password, new password and confirm password. I have used textinputlayout instead of simple edittext box because it helps user to show first “hint” and when user taps on, hint will come up with text over it as floating label so that the user can understand what to add in that box and also in case of error we can show that error to user.

Reset Password implementation

On clicking reset password option a dialog box appears in which user inserts the current password, new password and confirm password to confirm the new password. Before sending new password to the server we perform two checks

  1. New password should not be empty and length of new password should be at least six.
  2. New password and confirm password must be same.
if (!CredentialHelper.isPasswordValid(newPassword)) {




if (newPassword != conPassword) {

settingView?.invalidCredentials(false, Constant.NEW_PASSWORD)



And when these two checks are passed we send “new password” to server.

Endpoint use to reset password is mail id&password=current password&newpassword=newpassword

As you can see it needed three parameters

  • changepassword: Your email id
  • password : Your current password
  • newpassword: Your new password

When user logs in, we save user’s email id so that the user doesn’t have to provide it again and again when the user wants to change the password.


The user provides current password and new password through dialog box. We used resetPassword method to reset the password. We send these three parameters to the server using resetPassword method and if the password changed successfully then server sends a message.

override fun resetPassword(password: String, newPassword: String, listener: ISettingModel.onSettingFinishListener) {

  val email = PrefManager.getString(Constant.SAVE_EMAIL, null)

  resetPasswordResponseCall = ClientBuilder().susiApi


  resetPasswordResponseCall.enqueue(object : Callback<ResetPasswordResponse> {

  } )


We used retrofit library for network call and resetPasswordResponse is a model class using which we are retrieving server response.


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Handling Change of Password of SUSI.AI Account

In this blog, we will talk about a very special case, where the user changes his password to his current one only, in other words, the user enters the same password in both current password and new password. This case is now being handled by SUSI.AI server.

Considering the example of SUSI.AI Web Chat, we have following dialog when the user tries to change his/her password:

Here the user can add his/her current password and new password. When the new password meets the minimum conditions (minimum 6 characters), then the user can press CHANGE button.

We make ajax call to the server with the following endpoint:

            'changepassword=' + email +
            '&password=' + this.state.passwordValue +
            '&newpassword=' + this.state.newPasswordValue +

Here we have 4 parameters:

  • changepassword: This takes the email of the current user
  • password: This is the password of the current user, which is saved in the state named “passwordValue”
  • newpassword: This is the new password which the user enters
  • access_token: These are access tokens which are fetched from cookies. These are defined on login and are deleted on logout.

This is now handled on the server by a file named Here we have to check whether the newpassword and password matches or not.

In this file, we have a function named serviceImpl with return type ServiceResponse and takes in an argument: Query post (Query is the return type). The query is not the only argument, Please read from the file from resources mentioned below for all the argument. To handle our case we just need to work with the post.

We extract the password, newpassword and email as follows:

String useremail = post.get("changepassword", null);
String password = post.get("password", null);
String newpassword = post.get("newpassword",null);

So to simply handle the case where password and newpassword matches, we define an if block in java and compare these two parameters as follows:

            result.put("message", "Your current password and new password matches");
            result.put("accepted", false);
            return new ServiceResponse(result);

Here we put the message as “Your current password and new password matches” and make the accepted flag of result JSON as false. After this, we return the ServiceResponse.

Now in our web chat client, the ajax call is as follows:

                url: changePasswordEndPoint,
                dataType: 'jsonp',
                crossDomain: true,
                timeout: 3000,
                async: false,
                statusCode: {
                    422: function() {
                      let msg = 'Invalid Credentials. Please check your Email or Password.';
                      let state = this.state;
                      state.msg = msg;
                success: function (response) {
                    let msg = response.message+'\n Please login again.';
                    let state = this.state;
                    state.msg = msg;
                    state.success = true;
                    state.msgOpen = true;
                error: function(jqXHR, textStatus, errorThrown) {
                    let msg = 'Failed. Try Again';
                    if (status === 'timeout') {
                      msg = 'Please check your internet connection';
                    let state = this.state;
                    state.msg = msg;
                    state.msgOpen = true;

In our success method of ajax call,  we receive the JSON response in a variable named response and store this in the state in variable msg and set the state of success equal to true. We then use the state and message to handle accordingly.

Our JSON object when both password and new password are same:

So this is how clients can handle accordingly to the message received from the server instead of doing this on their own end.


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