Check if AsyncTask is taking too long

I have an AsyncTask that get info from the web. Sometimes the connection fails and the AsyncTask processdialog is running forever.

In the doInBackground I have a check in the end if my catched info are empty and if this is the case, it should appear Positive button/Negative button, but this is not happening. The dialog is just running.

How can I check if an AsyncTask is taking too long time (Maybe 5 seconds) and dismiss the dialog?

Code snippet (doInBackground):

 //orders is my ArrayList<Order> object, from my own Order class.
 if(orders==null) {
                pdia.dismiss();
                AlertDialog.Builder alt_bld = new AlertDialog.Builder(ctx);
                alt_bld.setMessage("Try agin?")
                .setCancelable(false)
                .setPositiveButton("Try again", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {

                    button_refresh.setVisibility(View.GONE);

                     new ListTask().execute(null, null , null);


                }
                })
                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                dialog.cancel();
                }

                });
                AlertDialog alert = alt_bld.create();
                alert.setTitle("Connection failed!");
                alert.show();
            }
            else {
                return orders;
            }

开发者_Go百科Thanks in advance and tell me if you need more info!

Instead of checking your result in doInBackground() you can get the value from the process and check it in onPostExecute(), like this:

protected void onPostExecute(ArrayList<Order> localOrders){
    super.onPostExecute(localOrders);
    if (localOrders==null) {
       // Paste the positive and negative DialogListeners here 
       // and dismiss the dialog.
    }
}

The result from your doInBackground() process passes into onPostExecute's parameter, thence you can check if your ArrayList object is empty or not.

But then writing the above code snippet in the onPostExecute will defeat the purpose right? We want the user to not wait past 5 seconds for an answer from the webservice and therefore we must handle the timeout within doInBackground itself.