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Id like my full screen mobclix ads to be non destroyable for 2 seconds. Right now users can press the back button on the android phone before the ad even shows up. How can I accomplish this?

All you need to do is intercept the back button press which you can do by overloading:
onBackPressed()
On older devices this won't quite work and you'll need to do something like:
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_BACK) {
//Do something here
return true;
}
return super.onKeyDown(keyCode, event);
}