One time login like Whatsapp

1. Write these before OnCreate method

SharedPreferences sharedpreferences;

public static final String mypreference = "mypref";

String login_user="";

2.  Inside OnCreate method, Checks when activity loads for first time..  Get value from the key

//get

sharedpreferences = getSharedPreferences(mypreference,

       Context.MODE_PRIVATE);

SharedPreferences.Editor editor = sharedpreferences.edit();

login_user=sharedpreferences.getString("LOGGED_IN_AS", "");

editor.commit(); // commit changes

if (login_user.equals("1")){startActivity(new Intent(this,Dashboard.class));finish();}

3.  Put value for key 

//Put

sharedpreferences = getSharedPreferences(mypreference,

       Context.MODE_MULTI_PROCESS);

SharedPreferences.Editor editor = sharedpreferences.edit();  //deb done code for one time login

editor.putString("LOGGED_IN_AS", "1");

editor.commit();