Why onActivityResult can not catch result from browser?

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Mobile

Android

In my android app I call web brower to show a URL, I MUST do it, I am not allowed to use internal webView,

protected void browser(String javab){
try {
			String uuId = dicHelper.getDicNameByKlidValue(Constants.SETTINGS_USER_INFO, Constants.USER_INFO_GUID);
			String uri = Constants.MAIN_URL+"Payment/Default.aspx?userId="+uuId+"&&factorId="+javab;
			Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
			startActivityForResult(browserIntent, PAY_ACTIVITY);
}

And as usual, use onresultactivity to detect come back and finosh job.
Browser is fired, urle viewd but on backpress ( or even close) I can not detect that it is back.

    protected void onActivityResult(int requestCode, int result, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (result != -1) return;
    resultCode = result;
    datasource.open();
    if (requestCode == ADDRESS_ACTIVITY) {
        refreshDisplay();
    }
    if (requestCode == MASTER_ACTIVITY) {
        refreshMaster();
    }
    if (requestCode==PAY_ACTIVITY) closeFactor();
}

Also I used on window focus change, but found it useless.
Please help.
Thank you.