You want to sign in using shared preferences.
Follow these options
1: Get data from EditText in your signin activity. Like
string username = ed1.getText().toString();
string password = ed2.getText().toString();
then get data from shared preferences username and password
now compare both et
if(username.equals(sharepreferencesusername) && password.equals(sharedpreferencespassword)){
goto next activity...
}
solved how to get sharedpreferences value in edittext from another activity in android for signin [closed]