looper

How to raise a toast in AsyncTask, I am prompted to used the Looper

I have tasks completed by AsyncTask in background. At some point I need to issue a Toast that something is completed. I've tried and I failed because Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() How can I do that? ...

Android - Inter thread communication and network socket

Hi this is what I am trying to achive 1) My main application/activity starts a thread to listen to network messages (tcp). But I want this thread to listen to network messages (on tcp socket) as well as messages from main activity. I am exploring if I can use socket for network messages and Looper for internal messages. I dont think it...

thread looper handler not being created despite code

Hey guys, so I have been getting this really weird bug in my android app that I have isolated down to the fact that a handler is not being created. The odd part, is that despite the fact 5 threads are being created, under certain circumstances...only 4 handlers are created. And then the rest of the time, 5 handlers are being created. N...

What is blackberry's equivalent to Androids Looper?

Android has Looper, and iPhone has Run Loops. It seems like Blackberry would have a similar backed in facility to queue and run threads. Does anyone know if there is? ...

Can't create handler inside thread that has not called Looper.prepare() inside AsyncTask for ProgressDialog

I don't understand why I'm getting this error. I'm using AsyncTask to run some processes in the background. I have: protected void onPreExecute() { connectionProgressDialog = new ProgressDialog(SetPreference.this); connectionProgressDialog.setCancelable(true); connectionProgressDialog.setProgressStyle(ProgressDialog.STYLE_...

Calling Looper more than once causes "sending message to a Handler on a dead thread"

I am using an Executor [fixed thread pool] with my own ThreadFactory that adds a Looper: Handler HANDLER = new Handler(); Executor THREADS = Executors.newFixedThreadPool(THREAD_POOL_SIZE, new ThreadFactory() { @Override public Thread newThread(Runnable runnable) { return new MyThread(new Runnable() { @Override...

How to better unit test Looper and Handler code on Android?

I use the android.os.Handler class to perform tasks on the background. When unit testing these, I call Looper.loop() to make the test thread wait for the background task thread to do its thing. Later, I call Looper.myLooper().quit() (also in the test thread), to allow the test thread to quit the loop and resume the testing logic. It's a...

Android: Only one Looper may be created per thread

Hello everyone, I am having a problem with Android looper. I have a class that has extended AsynTask. Inside doInBackground() method i have Looper.prepare() and some code below. It runs well and good for the first time but after that it gives an exception " Only one Looper may be created per thread" . There seems some solution...

CountDownTimer: "Can't create handler inside thread that has not called Looper.prepare()"

I know the general problem of "Can't create handler inside thread that has not called Looper.prepare()" has been asked before, but I am struggling to understand how it applies in this case. I am trying to construct a new CountDownTimer in a non-UI thread, which I guess is the cause of this error, but I don't really understand why the ...