Question

my main.xml file is just dummy. I want to start different activites based on the condition. If the password is found in shared pref file, the login activity should be launched, and if password is not found, the configuration activity should be launched. it is working fine but when I press the back key from keypad, the main activity is shown (I mean the blank screen because there is nothing) How can I avoid this?

 /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        prefs = getSharedPreferences(preffilename, MODE_PRIVATE);
        final String password = prefs.getString("password",null);

        if(password == null)
        {
            Intent i = new Intent(getApplicationContext(), Configuration.class);
            startActivity(i);
        } 
        else
        {
            Intent i = new Intent(getApplicationContext(), Login.class);
            startActivity(i);
        }
    }

Answer 1

Call finish() from your main activity after calling startActivity(), this will remove main activity from stack.