public class MeineActivity extends ListActivity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity);
        // Weiterer Code
        }

 public void onResume(){
    	super.onResume();
    	setContentView(R.layout.activity);
        // Weiterer Code
         }

}

 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
  //Mein Code
}

@Override
public void onResume()
{
    super.onResume();
    //Mein Code
}

 @Override
    public void onPause()
    {
    	super.onPause();
    }

 View view = ActivityGroup.group.getLocalActivityManager()  
        .startActivity("activity_neu", i  
        .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
        .getDecorView();  
        
        // Again, replace the view  
        Activity.group.replaceView(view);

public void replaceView(View v) {  
        // Adds the old one to history  
       history.add(v);  
        // Changes this Groups View to the new View.  
       setContentView(v);  
      }  
	
	public void back() { 
		try{
        if(history.size() > 0) {  
            history.remove(history.size()-1);  
            setContentView(history.get(history.size()-1));  
        }else {  
            finish();  
        }  
		}
		catch(Exception e){}
    }
	
    public void onBackPressed() {  
        ActivityGroup.group.back();  
        return;  
    }

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event)
    {
    if(keyCode == KeyEvent.KEYCODE_BACK)
    {
    ActivityGroup.group.back();
    return true;
    }
    return super.onKeyDown(keyCode, event);
    }