Ytukyg

I am trying to find a way to keep all the email used for login into the application in a device and show them as suggestion or autocomplete when ever a user tries to login in to the application.

I tried using shared preferences and store them into an ArrayList during the login. However each time I login, the email gets replaced with the latest login email instead of adding up.

Example: first i login with admin@admin.com and logout from the system. For next login the suggestion admin@admin.com shows up. However if now i login with employee@employee.com, the old stored email is replaced with the new one.

What I did to get this was first after login I stored the user email from the server response in a shared preference.

Next I put that data into an ArrayList

    SharedPreferences getEmail = getSharedPreferences("userEmail", Context.MODE_PRIVATE);

    String input_email = getEmail.getString("emp_email", "");



    ArrayList<String> userList = new ArrayList<>();

    userList.add(input_email);



    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, userList);

    if (userList.size() > 0){

        userEmail.setAdapter(adapter);

    }

The above code in inside the onCreate method of the login activity. How can i do this.
I am guessing maybe this is not the correct way to remember email address for auto suggestion. If so then please point me to the right direction.

Thank you.

Update

Fetching response from the server in LoginActivity on successful login

public void getDataForId() {



    SharedPreferences authToken = getSharedPreferences("authToken", Context.MODE_PRIVATE);

    String token = authToken.getString("token", "");



    apiInterface = ApiClient.getApiClient().create(ApiInterface.class);

    Call<UserResponse> call = apiInterface.getData("Bearer " + token);

    call.enqueue(new Callback<UserResponse>() {

        @Override

        public void onResponse(Call<UserResponse> call, Response<UserResponse> response) {



            if (response.isSuccessful()) {



                String emp_email = response.body().getUser().getEmail();



                ArrayList<String> listEmails = getFromPrefs(this);



                if(listEmails == null){

                   listEmails = new ArrayList<>();

                   listEmails.add(emp_email);

                }



                saveToPrefs(this, listEmails);



                /*Log.i("MainActivity", "onCreate: " + getFromPrefs(this).toString());



                if(!listEmails.contains(emp_email)){

                   listEmails.add("b@b.b");

                }



                saveToPrefs(this, listEmails);



                Log.i("MainActivity", "onCreate: " + getFromPrefs(this).toString());*/





            } else {

            }

        }



        @Override

        public void onFailure(Call<UserResponse> call, Throwable t) {

        }

    });

}

Note that in am getting the email in the variable **emp_email* (assume the other two functions given by you are in the file). What I assume is that the commented out part (after the first email is saved), will start in the onCreate methode for me as after logging out.

there i get the pref data see it the new email matched the pref data and then store it. This is when it is getting replaced.

Try this.

I have edited your code

gist.github.com/adrielAd/b1fbc4f8665183eb195871d21cd415eb

// make listEmails global and also initialise this in onCreate so you get already saved emails when you come to this screen

ArrayList<String> listEmails;



public void getDataForId() {



    SharedPreferences authToken = getSharedPreferences("authToken", Context.MODE_PRIVATE);

    String token = authToken.getString("token", "");



    apiInterface = ApiClient.getApiClient().create(ApiInterface.class);

    Call<UserResponse> call = apiInterface.getData("Bearer " + token);

    call.enqueue(new Callback<UserResponse>() {

        @Override

        public void onResponse(Call<UserResponse> call, Response<UserResponse> response) {



            if (response.isSuccessful()) {



                String emp_email = response.body().getUser().getEmail();



                listEmails = getFromPrefs(this);



                if(listEmails == null){

                   listEmails = new ArrayList<>();

                   listEmails.add(emp_email);

                }else{

                  if(!listEmails.contains(emp_email)){

                     listEmails.add(emp_email);

                  }

                }





                saveToPrefs(this, listEmails);



                /*Log.i("MainActivity", "onCreate: " + getFromPrefs(this).toString());



                if(!listEmails.contains(emp_email)){

                   listEmails.add("b@b.b");

                }



                saveToPrefs(this, listEmails);



                Log.i("MainActivity", "onCreate: " + getFromPrefs(this).toString());*/





            } else {

            }

        }



        @Override

        public void onFailure(Call<UserResponse> call, Throwable t) {

        }

    });

}

You can do like below.

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);



    ArrayList<String> listEmails = getFromPrefs(this);



    if(listEmails == null){

        listEmails = new ArrayList<>();

        listEmails.add("a@a.a");

    }



    saveToPrefs(this, listEmails);



    Log.i("MainActivity", "onCreate: " + getFromPrefs(this).toString());



    if(!listEmails.contains("b@b.b")){

        listEmails.add("b@b.b");

    }



    saveToPrefs(this, listEmails);



    Log.i("MainActivity", "onCreate: " + getFromPrefs(this).toString());



}



public static void saveToPrefs(Context context, ArrayList<String> listEmail) {

    SharedPreferences appSharedPrefs = PreferenceManager

            .getDefaultSharedPreferences(context.getApplicationContext());

    SharedPreferences.Editor prefsEditor = appSharedPrefs.edit();

    Gson gson = new Gson();

    String list = gson.toJson(listEmail);

    prefsEditor.putString("list", list);

    prefsEditor.commit();

}





public static ArrayList<String> getFromPrefs(Context context) {

    SharedPreferences appSharedPrefs = PreferenceManager

            .getDefaultSharedPreferences(context.getApplicationContext());

    Gson gson = new Gson();

    String list = appSharedPrefs.getString("list", "");

    ArrayList<String> listEmail = gson.fromJson(list, ArrayList.class);

    return listEmail;

}

Here is the screenshot for logs