Dusan,
For your code to work, do two things:
- Take out the Looper stuff from your worker thread. Looper.loop() goes
into a loop that de-queues and processes messages until someone calls
quit(). In your code, it keeps running forever after parsing is
finished, I don't think you intended that. Simply exit your worker
thread's run(), allowing the worker thread to terminate.
- Since the parse tracker is called from the same worker thread, use a
posted runnable to switch the call to setProgress() to the UI thread.
And to answer your more broad question. The Android UI framework is not
thread safe, and assumes that all UI calls are made from the main
thread. However, this is not enforced in the code, at least not
consistently for each and every UI related method. This limitation is
documented, and it's assumed that developers read the docs and follow it.
Sometimes your code gets lucky and calling a UI-related method from a
non-UI thread works. Other times (may be same application, same input
data, same phone, only a new debug/run session) it may not get so lucky
and crash, do nothing, do the wrong thing - in general, it's unpredictable.
A side note - these kinds of issues should be easier to diagnose on one
of the upcoming dual-code tablet devices with Honeycomb. In my
experience, a multi-threaded program that has threading issues (lack of
synchronization, deadlocks, etc.) often "gets lucky" and works fine in a
preemptive, uni-core environment, but has a much higher chance of
hitting those problems on a multi-core system.
-- Kostya
31.01.2011 2:13, skrat ?????:
I have following code http://pastie.org/1513146, and while setProgress
method works, onParsed doesn't. onParsed has to be called from Handler
message because it accesses progressbar view from different thread.
setProgress is called from different thread as well (thread running
ParseTracker.update), also accesses progressbar view, but works
without Handler. Am I missing something about accessing views from
different threads? --
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