If you use Handler (I see you do and hopefully you created its instance on the UI thread), then don't use runOnUiThread() inside of your runnable. runOnUiThread() is used when you do smth from a non-UI thread, however Handler will already execute your runnable on UI thread.
Try to do smth like this:
private Handler mHandler = new Handler();
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gameone);
res = getResources();
// pB.setProgressDrawable(getResources().getDrawable(R.drawable.green)); **//Works**
mHandler.postDelayed(runnable, 1);
}
private Runnable runnable = new Runnable() {
public void run() {
pB.setProgressDrawable(getResources().getDrawable(R.drawable.green));
pB.invalidate(); // maybe this will even not needed - try to comment out
}
};