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POAndroid Add AsyncTask to PreferenceActivity to load a lot of preferences the first time
 

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    <p>I have an application with quite a lot of preferences. So when the user loads the Preferences the first time, it takes quite a while. So the UI is freezing while loading the prefs.</p> <p>This is why I want to add a dialog telling the user that the prefs are loading.</p> <p>The problem is, that loading the preferences is only allowed on the UI thread because when I am trying to load my preferences in the Async Task, I get this:</p> <blockquote> <p>ERROR/AndroidRuntime(4830): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.</p> </blockquote> <p>So when I add runOnUiThread() to the Async Task the whole purpose of doing it in the AsyncTask gets destroyed:</p> <pre><code>public class ApplicationPreferences extends PreferenceActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); new ProgressTask(ApplicationPreferences.this).execute(); } private class ProgressTask extends AsyncTask&lt;Void, Void, Void&gt; { private Context context; private ProgressDialog dialog; public ProgressTask(ListActivity activity) { context = activity; dialog = new ProgressDialog(context); } protected void onPreExecute() { this.dialog.setMessage("Loading..."); this.dialog.show(); } @Override protected Void doInBackground(Void... params) { runOnUiThread(new Runnable() { @Override public void run() { initPreferences(); } }); return null; } @Override protected void onPostExecute(Void result) { if (dialog.isShowing()) { dialog.dismiss(); } } } /* * THIS TAKES LONG THE FIRST TIME */ private void initPreferences() { addPreferencesFromResource(R.xml.preferences); // preferences ListPreference pref1 = (ListPreference) findPreference(getString(R.string.pref1)); // ........ etc } public static void start(Context context) { context.startActivity(new Intent(context, ApplicationPreferences.class)); } } </code></pre> <p>How can I do this better?</p>
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