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POAndroid: Progress Dialog error in AysncTask
 

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  1. POAndroid: Progress Dialog error in AysncTask
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    <p>I have some code that does some processing in an AsyncTask, while this is running I would like to display a Progress Dialog. At various points I was hoping to update the message but I'm having some trouble. Heres what I have so far:</p> <pre><code>class ShowDialogAsyncTask extends AsyncTask&lt;Void, String, Void&gt;{ private ProgressDialog progressSpinner; @Override protected void onPreExecute() { ProgressDialog progressSpinner = new ProgressDialog(MainActivity.this); progressSpinner.setTitle("File Download"); progressSpinner.setMessage("Connecting to Internet"); progressSpinner.show(); } @Override protected Void doInBackground(Void... params) { Log.v("doInBackground","1"); try { Log.v("doInBackground","2"); onProgressUpdate("Downloading File"); //do some stuff } catch (IOException e) { result = "Error"; } onProgressUpdate("Complete!"); SystemClock.sleep(300); return null; } protected void onProgressUpdate(String... values) { Log.e("onProgressUpdate",values[0]); try{ progressSpinner.setMessage(values[0]); }catch(Exception e){Log.e("onProgressUpdate","Error!");} Log.e("onProgressUpdate","Success!"); } @Override protected void onPostExecute(Void result) { progressSpinner.dismiss(); vf.showNext(); } } </code></pre> <p>The code which I was hoping would have updated the message doesn't work, it just throws an exception. Then the whole thing crashes when I attempt to dismiss the the progress dialog.</p> <p>I am pretty new to android development so I would very much appreciate any pointers.</p> <p>The Logcat entries where it all goes a bit pear shaped.</p> <pre><code>03-22 22:59:30.189: W/dalvikvm(8133): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 03-22 22:59:30.189: E/AndroidRuntime(8133): Uncaught handler: thread main exiting due to uncaught exception 03-22 22:59:30.195: E/AndroidRuntime(8133): java.lang.NullPointerException </code></pre> <p><strong>--UPDATE--</strong></p> <p>It appears that my issue was where I had been declaring the progress dialog box. I eventually figured out that I could declare the progress dialog in a newly created constructor like so</p> <pre><code>progressSpinner = new ProgressDialog(mContext); </code></pre> <p>It would then allow all the other methods of the AsyncTask class access to update the message.</p>
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      1. POAndroid: Progress Dialog error in AysncTask
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