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POProgressDialog and AsyncTask gives me some errors
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  1. POProgressDialog and AsyncTask gives me some errors
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    copied!<p>I am trying to use this code:</p> <ol> <li><p>When I am clicking on a imageButton, this will execute the goJournalArticles(View v) method:</p> <pre><code>public void goJournalArticles(View v) { new DownoadJournalsFinishedAsync().execute(); } </code></pre></li> </ol> <p>Then, I am doing some things and during this, I am showing the progressDialog:</p> <pre><code>class DownoadJournalsFinishedAsync extends AsyncTask&lt;String, String, ArrayList&lt;String&gt;&gt; { ProgressDialog dialog = new ProgressDialog(Journals.this); @Override protected void onPreExecute() { super.onPreExecute(); dialog.setMessage("Loading Articles. Please wait..."); dialog.setCancelable(false); dialog.show(); } @Override protected ArrayList&lt;String&gt; doInBackground(String... aurl) { String journalNameShort = localDatabase.getHistoryLastSelectedJournal(); int journalId = localDatabase.getJournalIdFromNameShort(journalNameShort); ArrayList&lt;String&gt; result = new ArrayList&lt;String&gt;(); try { infoCourrentIssue = serviceMDPI.JournalCurrentIssue(journalId); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } int issue =infoCourrentIssue.getIssue(); int volume = infoCourrentIssue.getVolume(); ArrayList&lt;Article&gt; articles = GetCurrentIssue(journalId,volume,issue); int size = articles.size(); for (int i=0;i&lt;size;i++) { result.add(Html.fromHtml(articles.get(i).getTitle()).toString()); } return result; } @Override protected void onPostExecute(ArrayList&lt;String&gt; result) { //View v = findViewById(R.id.Articles); Intent myIntent = new Intent(getBaseContext(), JournalArticles.class); myIntent.putExtra("articlesTitle", result); startActivityForResult(myIntent, 0); dialog.dismiss(); } } </code></pre> <p>But When I am trying to open a new activity with the intent, I am gotting this error:</p> <pre><code>03-05 12:08:47.724: E/AndroidRuntime(22249): FATAL EXCEPTION: main 03-05 12:08:47.724: E/AndroidRuntime(22249): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{milos.mdpi/milos.mdpi.JournalArticles}: java.lang.NullPointerException 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785) 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1893) 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.app.ActivityThread.access$1500(ActivityThread.java:135) 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1054) 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.os.Handler.dispatchMessage(Handler.java:99) 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.os.Looper.loop(Looper.java:150) 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.app.ActivityThread.main(ActivityThread.java:4389) 03-05 12:08:47.724: E/AndroidRuntime(22249): at java.lang.reflect.Method.invokeNative(Native Method) 03-05 12:08:47.724: E/AndroidRuntime(22249): at java.lang.reflect.Method.invoke(Method.java:507) 03-05 12:08:47.724: E/AndroidRuntime(22249): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849) 03-05 12:08:47.724: E/AndroidRuntime(22249): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607) 03-05 12:08:47.724: E/AndroidRuntime(22249): at dalvik.system.NativeStart.main(Native Method) 03-05 12:08:47.724: E/AndroidRuntime(22249): Caused by: java.lang.NullPointerException 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.app.Activity.findViewById(Activity.java:1732) 03-05 12:08:47.724: E/AndroidRuntime(22249): at milos.mdpi.JournalArticles.&lt;init&gt;(JournalArticles.java:13) 03-05 12:08:47.724: E/AndroidRuntime(22249): at java.lang.Class.newInstanceImpl(Native Method) 03-05 12:08:47.724: E/AndroidRuntime(22249): at java.lang.Class.newInstance(Class.java:1409) 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.app.Instrumentation.newActivity(Instrumentation.java:1040) 03-05 12:08:47.724: E/AndroidRuntime(22249): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1777) 03-05 12:08:47.724: E/AndroidRuntime(22249): ... 11 more </code></pre>
 

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