Using Bluetooth with Qt 5.3.1 on Android crashes with "invalid indirect reference"

micha-

Hello,

I just started doing a few tests using Bluetooth on an Android device. As soon as I try to use the Qt Bluetooth API the application will crash with the following info:

@W/dalvikvm(23855): Invalid indirect reference 0x40ef24e8 in decodeIndirectRef
E/dalvikvm(23855): VM aborting
F/libc (23855): Fatal signal 11 (SIGSEGV) at 0xdeadd00d (code=1)@

I'm using a Qt 5.3.1, Android 4.0.3 ABI: armeabi-v7a, HTC Sensation.

Here is what try:

@void TestBluetooth::start()
{

QList<QBluetoothHostInfo> localAdapters;

//when reaching this line the app crashes 
localAdapters = QBluetoothLocalDevice::allDevices();

}@

The same happens if I run the availble Bluetooth Examples.

Any ideas what the problem could be? Thanks!

optimusprime

Hello,

It's working in my computer. I tried both my own application and example one. Which OS are you using in your computer? I tried in linux

optimusprime

try this for device connection:

void TestBluetooth():: test ()
{

QBluetoothDeviceDiscoveryAgent *qbd = new QBluetoothDeviceDiscovery(this)

connect (qdb, SIGNAL (deviceDiscovered(QBluetoothDeviceInfo)),this,SLOT (testing(QBluetoothDeviceInfo)));
}

void TestBluetooth()::testing (const QBluetoothDeviceInfo &dvc)
{

qdebug() <<"device is:" <<dvc.name();

}

micha-

Thanks optimusprime. I'm using linux also. When trying:

@void TestBuetooth::start()
{

QBluetoothDeviceDiscoveryAgent *qbd = new  QBluetoothDeviceDiscoveryAgent(this);

connect(qbd,SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)), this, SLOT(test(QBluetoothDeviceInfo)));
qDebug() << "Starting discovery ...";

//here it prints the message, that the device does not support bluetooth
qbd->start();

}@

It reports, that the device does not support Bluetooth:

@W/Qt (14722): qbluetoothdevicediscoveryagent_android.cpp:98 (void QBluetoothDeviceDiscoveryAgentPrivate::start()): qt.bluetooth.android: Device does not support Bluetooth
@

I'm wondering if the Android version 4.0.3 may be too old?

I'm using JDK 1.8.0_05, android-ndk-r9d, android-sdk-linux-r23.0.2, AVD Target API 15

optimusprime

I think your problem is java version.
you should use jdk 1.6 version or 1.7 .

Try with 1.6 version, it should work.

optimusprime

http://www.kdab.com/qt-on-android-episode-2/

look over this document. This blog is posted by BogDan Vatra, one who make possible android app with Qt

micha-

No, that wasn't it either. I tried jdk 1.6 and 1.7 without luck :(. Anyway, thanks again for looking into this.

optimusprime

Report your issue to developer..