Android

Hy !

Im working on a tic tac toe game ..
when i press a button I check if the button is free if is free i set the buttons backround to an X.. with :

btn.setBackgroundResource(R.drawable.xpic);

afther this i call a method wich is the "Computer Turns" methot .. now my question is :
Is there any solution to set the picture bifore the mobile phone reach to en of code in "OnClick" ?

for example:

 btn.setBackgroundResource(R.drawable.xdraw);
            if(checkifwinner()) return;
            turn++;
            computerTurm();

there is a lot of code in the checkifwinner() because if wins then comes up a dialog.. and i dont want to wait till the dialog pups up.. how can i resolve this problem ?
Thanks a Lot.

//================== the dialog ================
@Override
protected  Dialog onCreateDialog(int id, Bundle args){
    switch(id){
            case 1:
                return new AlertDialog.Builder(this)
                .setIcon(R.drawable.ic_launcher)
                .setTitle("Pick some")

                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int whichButton)
                {
                   //do something
                }
                })

                .setNegativeButton("cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog,int whichButton)
                {
                    //do something
                }
                })

                .setMultiChoiceItems(items, itemsChecked, new DialogInterface.OnMultiChoiceClickListener() {
                public void onClick(DialogInterface dialog, int which,boolean isChecked) {
                    //Toast.makeText(getBaseContext(),items[which] + (isChecked ? " checked!":" unchecked!"),Toast.LENGTH_SHORT).show();
                }
                }
                )
                .create();