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POException "Can't create handler inside thread that has not called looper prepare" in android app
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  1. POException "Can't create handler inside thread that has not called looper prepare" in android app
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    copied!<p>I'm working on my first android app and I'm trying to use Quickblox.com as my backend. </p> <p>In order to use it, I need to authorize the app by creating a session using their SDK.</p> <p>So, I have the following code: </p> <pre class="lang-java prettyprint-override"><code>// Initialize QuickBlox application with credentials. QBSettings.getInstance().fastConfigInit(Consts.APP_ID, Consts.AUTH_KEY, Consts.AUTH_SECRET); // Authorize application QBAuth.createSession(new QBCallback() { @Override public void onComplete(Result result) {} @Override public void onComplete(Result result, Object context) { if (result.isSuccess()) { showMainScreen(); } else { // print errors that came from server Toast.makeText(getBaseContext(), result.getErrors().get(0), Toast.LENGTH_SHORT).show(); progressBar.setVisibility(View.INVISIBLE); } } }, QBQueries.QB_QUERY_AUTHORIZE_APP); </code></pre> <p>This code works well with an emulator, but it doesn't work if I try with a real android phone. I have a connection timeout error. I think I need to make this kind of requests (Web Services) in the background right?</p> <p>So I tried to use the AsyncTask to make the request to QB in the background, and changed the code to this:</p> <pre class="lang-java prettyprint-override"><code>new AsyncTask&lt;Void, Void, Void&gt;() { @Override protected Void doInBackground(Void... params) { // Initialize QuickBlox application with credentials. QBSettings.getInstance().fastConfigInit(Consts.APP_ID, Consts.AUTH_KEY, Consts.AUTH_SECRET); // Authorize application QBAuth.createSession(new QBCallback() { @Override public void onComplete(Result result) {} @Override public void onComplete(Result result, Object context) { if (result.isSuccess()) { showMainScreen(); } else { // print errors that came from server Toast.makeText(getBaseContext(), result.getErrors().get(0), Toast.LENGTH_SHORT).show(); progressBar.setVisibility(View.INVISIBLE); } } }, QBQueries.QB_QUERY_AUTHORIZE_APP); return null; } }.execute(); </code></pre> <p>I've seen a lot of similar questions here at SO, but I can't seem to find an answer that works with my code. I saw that functions that deal with the UI need to be called from the main thread, so I suppose that the code I have inside</p> <pre class="lang-java prettyprint-override"><code>onComplete(Result result, Object context) </code></pre> <p>should be inside a block like this right? </p> <pre class="lang-java prettyprint-override"><code>runOnUiThread(new Runnable() { public void run() { // code here } }); </code></pre> <p>But I tried that as well and it didn't work. Any guesses?</p> <p>I believe the problem is not because of the Toast and showMainScreen(). It still fails with this code: </p> <pre class="lang-java prettyprint-override"><code>// Initialize QuickBlox application with credentials. QBSettings.getInstance().fastConfigInit(Consts.APP_ID, Consts.AUTH_KEY, Consts.AUTH_SECRET); QBAuth.createSession(new QBCallback() { @Override public void onComplete(Result arg0, Object arg1) { // TODO Auto-generated method stub } @Override public void onComplete(Result arg0) { // TODO Auto-generated method stub } }, QBQueries.QB_QUERY_AUTHORIZE_APP); </code></pre> <p>But it doesn't fail if I just create the QBCallback object, without passing it to the QBAuth.createSession function.</p>
 

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