[Help] Do my stuff after activity loads

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Hello,
I'm trying to do something with my app but i dont know how =) maybe you can help me.

My main activity needs to initialize some parts of the app. It takes 2-5 seconds and I'd like to show the user a progress dialog.
the code im using is like

ProgressDialog tempdialog= ProgressDialog.show(this, "Loading", "Please Wait");
Config.init();
temdialog.cancel();

But i dont know where to put that code. I tried in onCreate(), onStart() and onResume(). But all them show a blackscreen while initializing and dialog is never shown.

Thanks in advance

Don't block the UI thread, use a background thread.

Thanks for the answer. I post my solution for helping others with the same problem

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        pd=ProgressDialog.show(this, "Loading", "Please wait");

        Thread t = new Thread() {

	          public void run() {
	        	  try {
					Config.init();
					myHandler.sendEmptyMessage(0);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}

	          }
	      };
	      t.start();
}
public Handler myHandler=new Handler()  {
     public void handleMessage(Message msg) { 
        pd.hide();
     } 
};