How do i store the user details as session

Question

Hello i am using dynamodb and i want to know how do i maintain a session when the user logs in.

Following is my login code

  Runnable runnable = new Runnable() {
        public void run() {
            Users user = mapper.load(Users.class,username);

            System.out.println(user.getPassword());
            System.out.println(username);
            if (user != null && user.getPassword().equals(password)){
                //System.out.println("Correct");
                runOnUiThread(new Runnable() {

                    @Override
                    public void run() {
                        setContentView(R.layout.activity_account);
                    }
                });
            }

and this is my user class where i set and get all entities

public class Users {

private String id;
private String email;
private String username;
private String password;
private String role;


@DynamoDBHashKey(attributeName = "id")
public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

@DynamoDBAttribute(attributeName = "email")
public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

same goes for all other variables as well.

Please look at these codes and tell me how i could store sessions as i want the id of the logged in user.

Answer 1

V1

you can use SharedPreferences like below

public class Prefs {

public static void putPref(String key, String value, Context context){
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = prefs.edit();
    editor.putString(key, value);
    editor.commit();
}

public static String getPref(String key, Context context) {
    SharedPreferences preferences =   PreferenceManager.getDefaultSharedPreferences(context);
    return preferences.getString(key, null);
 }
}

after you have to store

 Prefs.putPref("the key","the value",your context);

after to get your stored data

   String userId = Prefs.getPref("the key",your context);

you can use that where you want in your App .

V2

use Gson add this to your build.gradle

  compile 'com.google.code.gson:gson:1.7.2'

and convert your user object to json like this

 Gson gson = new Gson();

 User user = ...; 
 String json = gson.toJson(user);

after store your user

 Prefs.putPref("user",json,your context);

to get your user

 String json = = Prefs.getPref("user",your context);

 User user = null;
 if(json != null)
 user = gson.fromJson(json,User.class);

thats all