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POAndroid async task download failed err
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  1. POAndroid async task download failed err
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    copied!<p>I've developed an application that takes content from the internet and shows it accordingly on the device's screen . The program works just fine , a little bit slow . It takes about 3-4 seconds to load and display the content . I would like to put my code that does all the work ( grabbing web content and displaying it) in a background thread . Also , I'd like to show a progress dialog . </p> <pre><code>public class Activity1 extends Activity { private ProgressDialog progressDialog; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); new AsyncTask&lt;Integer, Integer, Boolean&gt;() { ProgressDialog progressDialog; @Override protected void onPreExecute() { /* * This is executed on UI thread before doInBackground(). It is * the perfect place to show the progress dialog. */ progressDialog = ProgressDialog.show(Activity1.this, "", "Loading..."); } @Override protected Boolean doInBackground(Integer... params) { if (params == null) { return false; } try { /* * This is run on a background thread, so we can sleep here * or do whatever we want without blocking UI thread. A more * advanced use would download chunks of fixed size and call * publishProgress(); */ Thread.sleep(params[0]); // HERE I'VE PUT ALL THE FUNCTIONS THAT WORK FOR ME } catch (Exception e) { Log.e("tag", e.getMessage()); /* * The task failed */ return false; } /* * The task succeeded */ return true; } @Override protected void onPostExecute(Boolean result) { progressDialog.dismiss(); /* * Update here your view objects with content from download. It * is save to dismiss dialogs, update views, etc., since we are * working on UI thread. */ AlertDialog.Builder b = new AlertDialog.Builder(Activity1.this); b.setTitle(android.R.string.dialog_alert_title); if (result) { b.setMessage("Download succeeded"); } else { b.setMessage("Download failed"); } b.setPositiveButton(getString(android.R.string.ok), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dlg, int arg1) { dlg.dismiss(); } }); b.create().show(); } }.execute(2000); /* new Thread() { @Override public void run() { // dismiss the progressdialog progressDialog.dismiss(); } }.start(); }*/ } </code></pre> <p>If I run the application with this code , I get this : <a href="http://i56.tinypic.com/2rd9mvm.png" rel="nofollow">download failed</a> . On the other hand , if I keep the final thread , the app crashes , NullPointerException . I really don't know what to do anymore .</p> <p><strong>I would really appreaciate if you could give me an alternative to this code , not just some hints because I'm new to android and I really don't know much . Thanks.</strong></p> <p>UPDATE :</p> <p>I don't want to display the progress of the download , I want to display the progress dialog until the app is ready to display the full content.</p>
 

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