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POProgressDialog in Android AsyncTask does not display at the right time
 

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  1. POProgressDialog in Android AsyncTask does not display at the right time
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    <p>So I've got these long running server calls over what is basically OData going on in my Android application. The consumer of the calls uses <code>.execute().get()</code> to wait for the response from the network thread (I know the proper way is to make the whole thing asynchronous and callback-based, but the app cannot function in any way without this data, and completely rearchitecting it to work in that way doesn't seem to provide any benefits).</p> <p>So I found many snippets online where using the <code>ProgressDialog</code> in combination with <code>onPreExecute()</code> and <code>onPostExecute()</code> as shown in the code sample below can be used to show a progress dialog while the <code>AsyncTask</code> executes. I'm using exactly the samples provided, but what happens is that the call starts, it waits for the network transaction, then <em>very</em> quickly flashes and hides the progress dialog. It can sit for whole seconds waiting on the transaction and I know for a fact that it's waiting in the <code>doInBackground()</code>, but the dialog just won't pop up until the very end, making it effectively useless.</p> <p>In the code below the <code>DoEvents()</code> bit is basically just a very short sleep. I've tried with and without it and there doesn't seem to be a difference, but it seemed worth trying.</p> <pre><code>class GetFromServerTask extends AsyncTask&lt;String, Void, String&gt; { private Context context; private ProgressDialog dialog; public GetFromServerTask(Context ctx) { context = ctx; dialog = new ProgressDialog(ctx); } @Override protected void onPreExecute() { super.onPreExecute(); dialog.setMessage("Loading..."); dialog.show(); DoEvents(); } @Override protected String doInBackground(String... parms) { if(InOfflineMode) return "notdeserializable"; String url = parms[0]; HttpURLConnection urlConnection = null; try { URL typedUrl = new URL(url); urlConnection = (HttpURLConnection) typedUrl.openConnection(); //Add Authorization token if(InDebugMode) { urlConnection.addRequestProperty("AuthToken", AuthToken); } else { urlConnection.addRequestProperty("Authorization", "Bearer " + AuthToken); } urlConnection.addRequestProperty("Accept", "application/json"); DoEvents(); InputStream in = new BufferedInputStream(urlConnection.getInputStream()); byte[] contents = new byte[in.available()]; int bytesRead = 0; String strContents = ""; while((bytesRead = in.read(contents)) != -1){ strContents += new String(contents, 0, bytesRead); DoEvents(); } if(strContents.startsWith("&lt;HTML&gt;")) return "Error: Received unexpected HTML when connecting to service. Make sure you are not connected to a WIFI that requires authentication."; return strContents; } catch(UnknownHostException hex) { return "Error: Could not find server address. Make sure you are connected to the internet. If you just changed connections (ie: turning WIFI on or off) it make take a minute to refresh"; } catch(Exception ex) { String msg = "Error: " + ex.getClass().getName() + ": " + ex.getMessage(); Log.e("TE", msg); return msg; } finally { if(urlConnection != null) urlConnection.disconnect(); } } @Override protected void onPostExecute(String result) { super.onPostExecute(result); if(dialog != null &amp;&amp; dialog.isShowing()) dialog.dismiss(); DoEvents(); } } </code></pre> <p>I've also tried the slightly different version suggested elsewhere on SO (shown below) with the same exact results:</p> <pre><code>protected void onPreExecute() { dialog=ProgressDialog.show(context, "", "Loading...", true, false); super.onPreExecute(); } </code></pre> <p>I've also tried taking the <code>ProgressDialog</code> out of the <code>AsyncTask</code> all together and showing it "outside" the task, as shown below. In this case it doesn't even appear.</p> <pre><code>ProgressDialog dialog = ProgressDialog.show(ServerAccessLayer.m_context, "", "Loading...", true, false); String retVal = new GetFromServerTask(ServerAccessLayer.m_context).execute(url).get(); dialog.dismiss(); return retVal; </code></pre>
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    1. COWhat happens if you follow the fix described here? (http://stackoverflow.com/questions/11943133/android-asynctask-onpreexecute-not-called-indeterminantly)
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      1. USKen Wolf
    2. CO@Ken Wolf: Same behavior. Can see the UI response (ie: a spinner loading with data pulled from the server) occurring *before* the progress dialog quickly pops and then vanishes.
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      1. USGakidou
    3. COYour fix as shown by taking it outside the task won't work because execute returns immediately. This means it will call dismiss immediately. To do that you would call show before execute and call dismiss in onPostExecute.
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      1. USGabe Sechan
 

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