Not start MainActivity with android 2.3

Question

I want to start my MainActivity, in android 2.3, it will not start, but in Jelly Bean it works. I get no error, nothing happens!

I\'ve noticed when I use putExtra, then

Answer 1

I do this to start a main activity:

Intent intent = IntentCompat.makeRestartActivityTask(cn);
activity.startActivity(intent);


        Intent i =  new Intent("android.intent.action.MAIN");
        final ComponentName cn = new ComponentName  ("de.application.ui", "de.application.ui.MainActivity");

                        i.setComponent(n);                          

                    try {
                        startActivity(i);
                    } 
                    catch (ActivityNotFoundException e) {

                    }