调用新的MyAsyncTask（）。execute（）。get（）Android时进度对话框不起作用

Question

how to show progress dialog on onPreExecute() of AsyncTask android below is my code here in this onPreExecute() method progress dialog is not showing on UI Thread

//calling AsyncTask

try {

        new XYZ().execute(employeeId, password).get();
    } catch (InterruptedException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    } catch (ExecutionException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }


     class XYZ extends AsyncTask<String, Integer, Void> {

    ProgressDialog simpleWaitDialog;

    @Override
    protected void onPreExecute() {


        simpleWaitDialog =  new ProgressDialog(TreeViewListDemo.this);
        System.out.println("fgfdgfgfgf"+simpleWaitDialog);
        simpleWaitDialog.setMessage("Loading...");
        simpleWaitDialog.setIndeterminate(true);
        simpleWaitDialog.setCancelable(true);


        simpleWaitDialog.show();

    }

    @SuppressWarnings("unchecked")
    @Override
    protected Void doInBackground(String... params) {

        String username = params[0];
        String password = params[1];
        // this is code for perfoming SOAP web services which is working    fine and getting data from server side
        return null;
    }

}

Answer 1

You are calling get() , presumably from the UI thread. From the documentation, the get() method:

Waits if necessary for the computation to complete, and then retrieves its result.

This means you block the UI thread so that it cannot show the progress dialog. I think you want to replace the call to get() with execute()

Answer 2

Progres dialog show untill the doInBackground method got execute.

And Here you are just Run below two line

String username = params[0];
String password = params[1];

Is hardly take time in millisecond so your progress show and close in millisecond. Please Put log values in onPreExecute() to check your progress dialog show our not.

AsyncTask is normally used to perform Network operations..!!

HapPy coading..!!