Progress dialog and AsyncTask error

Question

I\'m a bit new with the AsyncTask and ProgressDialog and i\'m getting a null pointer exception error whenever i call new MyTask().execute(); on my button does my ap

Answer 1

nother part that I hope it helps ...if u want to change the text and percentage of progress during the background task u can define a handler

public class MyTask extends AsyncTask
{
    private ProgressDialog progressDialog;
    private String mstepDescription;
    protected int mprogressPercentage;

    private String mstepDescription;
    protected int mprogressPercentage;

    Handler handle = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);

            progressDialog.setMessage(mstepDescription);
            progressDialog.setProgress(mprogressPercentage);

        }
    };

    void Step (String StepDescription, int Progress)
    {
        mstepDescription = StepDescription;
        mprogressPercentage = Progress;
       handle.sendMessage(handle.obtainMessage());
    }


    Protected void onPreExecute()
    {
         // create dialog here
        progress = new ProgressDialog (...);
        progress.setMessage(...);
        progress.show();
     }

     protected void onPostExecute(...){
        // dismiss dialog here
        progress.dismiss();
     }

   @Override
    protected Void doInBackground(Void... params)
    {
          // do somthing 
          Step("...", 40);
          // do something else
    }

}