please consider Shared Preference :
// Declaration
public static String KEY = "SESSION";
public static void saveUserName(String username, Context context) {
Editor editor = context
.getSharedPreferences(KEY, Activity.MODE_PRIVATE).edit();
editor.putString("username", username);
editor.commit();
}
public static String getUserName(Context context) {
SharedPreferences savedSession = context.getSharedPreferences(KEY,
Activity.MODE_PRIVATE);
return savedSession.getString("username", "");
}
You can store the login credentials to preference and retrieve them as well in any of your activity.
SaveUsername("Your text to save", Your_activity.this);
And to retrieve the value
String mUserName = getUserName(YourActivity.this);
It is recommended to have all your preference methods in your utils class to keep the code organized.
You can read more here