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<DIV><FONT face=Arial size=2>Hi Kate,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thank you for your answer.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I tried some traces and modifications into the lib
QtConnectivity without success. It seems to me that functions into the library
already contain calls to JNIThreadHelper class that should setup the Java
environment by performing jvm->AttachCurrentThread(), but this doesn't solve
the problem.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>At the same time, I performed some basic bluetooth
tests directly through Java Eclipse
(BluetoothAdapter.getDefaultAdapter.getName), which work fine on Nexus 7 with
Android 4.2.</FONT></DIV>
<DIV><FONT face=Arial size=2>However, our project contains some legacy parts
that have already been developed in C, and using Qt would be the very best way
to integrate them. Therefore I will only envision to implement a direct bridge
between Java and C parts as a last resort if I can't find a viable solution
with Qt.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Consequently, I am very interested by your patches
even before the next release, which could be helpful for us to take a decision
for our development. Overriding and deploying the default Necessitas lib
QtConnectivity is not a problem for me, at least for test purpose.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Dominique</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=kate.alhola@gmail.com href="mailto:kate.alhola@gmail.com">Kate
Alhola</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=dominiquerety@hotmail.fr
href="mailto:dominiquerety@hotmail.fr">Dominique Rety</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=necessitas-devel@kde.org
href="mailto:necessitas-devel@kde.org>"><necessitas-devel@kde.org></A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, December 26, 2012 4:36
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Crash when using
Bluetooth</DIV>
<DIV><BR></DIV>
<DIV>On 13.12.2012, at 16.41, Dominique Rety <<A
href="mailto:dominiquerety@hotmail.fr">dominiquerety@hotmail.fr</A>>
wrote:</DIV>
<DIV><BR></DIV>
<BLOCKQUOTE type="cite">
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<DIV><FONT face=Arial size=2>Hi,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am currently developing a telecommunication
project involving Blutooth communication between Android devices. For this
purpose, I'm trying to use Necessitas Bluetooth support and I experiment
very similar problems that are described in the "Crash when using Bluetooth"
(Kate Alhola) archive thread.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></DIV></DIV></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV>There is several issues in current necessitas libQtConnectivity version.
I have hopefully fixed most of them and i have version of libQtConnectivity
that least works with my own applocation. I try to deliver patches to
necessitas project so that fixes could be included in next
release. </DIV><BR>
<BLOCKQUOTE type="cite">
<DIV>
<DIV>
<DIV><FONT face=Arial size=2>Environment:</FONT></DIV>
<DIV><FONT face=Arial size=2>Java JDK 1.7.0_09<BR>Qt Creator 2.5.83 Based on
Qt 4.8.3 running on Linux Suze<BR>Kit = Necessitas Qt 4.8.2 for Android
armv7a<BR>Compiler = Android GCC (arm-4.4.3)<BR>Android target SDK =
android-16<BR>Deploy to Nexus 7 with Android version 4.2.</FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT face=Arial
size=2></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial size=2>I firstly tried to deploy the btchat sample and
I faced the same problem:</FONT></DIV>
<DIV><FONT face=Arial size=2>JNI ERROR (app bug): accessed stale local
reference 0xe680001d (index 7 in a table of size 4)<BR>VM aborting<BR>Fatal
signal 11 (SIGSEGV) at 0xdeadd00d (code=1), thread 13965
(.example.btchat)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Setting traces in different source
files of the connectivity library, I also noticed that the error
happens when trying to use some member functions of QBluetoothLocalDevice
(btchat sample requests for the local device name from the main
function).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I tried to bypass this problem by only creating
the QBluetoothLocalDevice without requesting for the device name in the
btchat application. The program then starts correctly.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>In the btchat application, the "Connect" button
calls the QBluetoothServiceDiscoveryAgent::start function. This function
randomly processes the request because it relies on discoveryState and
deviceAddress members, which seem not to be initialized : either the
discovery process freezes or the program aborts with an error (if luckily
discoveryState and deviceAddress members get consistent values). I didn't
try any further investigation. It seems to me that the connectivity library
is compiled with qbluetoothlocaldevice_p.cpp, which just contains empty
functions for the QBluetoothLocalDevice class, instead of a customized
source for Android.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></DIV></DIV></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV>Yes, that's case. The QBluetoothLocalDevice initializes static handles to
java virtual machine that are then referenced by other modules. I have made
fixes to several parts of libQtConnectivity</DIV>
<DIV><BR></DIV><BR>
<BLOCKQUOTE type="cite">
<DIV>
<DIV>
<DIV><FONT face=Arial size=2>Is Bluetooth support for Android in Necessitas
complete ?</FONT></DIV></DIV></DIV></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV>Most of, some functions are still missing but there are some bugs in
current version</DIV><BR>
<BLOCKQUOTE type="cite">
<DIV>
<DIV>
<DIV><FONT face=Arial size=2>Is the btchat sample expected to work
properly with Android ?</FONT></DIV></DIV></DIV></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV>I have not tried that one</DIV><BR>
<BLOCKQUOTE type="cite">
<DIV>
<DIV>
<DIV><FONT face=Arial size=2>Is there any specific configuration issue I
could miss ?</FONT></DIV></DIV></DIV></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV>That's good question, what is origin of the bugs, does it work with older
android</DIV>
<DIV>Versions ? The source reason of bugs is JNI handles alocation that
conflict with</DIV>
<DIV>Current thread structure and some that handles are expired when used. I
have only tested with</DIV>
<DIV>Android 4.x</DIV><BR>
<BLOCKQUOTE type="cite">
<DIV>
<DIV>
<DIV><FONT face=Arial size=2>Is there any corrective or complement software
I could download ?</FONT></DIV></DIV></DIV></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV>I could make my patches avaiable before next release but overriding
default necessitas libQtConnectivity requires some tricks</DIV><BR>
<BLOCKQUOTE type="cite">
<DIV>
<DIV>
<DIV><FONT face=Arial size=2>How can I progress on this issue ? What is the
best way to get help and advices ?</FONT></DIV></DIV></DIV></BLOCKQUOTE>
<DIV><BR></DIV>This list works fine.
<DIV><BR></DIV>
<DIV>Kate</DIV>
<DIV><BR>
<BLOCKQUOTE type="cite">
<DIV>
<DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Dominique RETY</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="">dominiquerety@hotmail.fr</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></DIV></DIV></BLOCKQUOTE>
<BLOCKQUOTE type="cite">
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