NFC on QT using JNI

Atr0n · wrote on 21 Mar 2015, 21:29

This post is deleted!

SGaist · wrote on 21 Mar 2015, 21:48

Hi and welcome to devnet,

The patch is currently in the dev branch so unless it gets reverted it should be in 5.5. If you would like to base your code on it then you can build Qt yourself using that branch.

Atr0n · wrote on 21 Mar 2015, 22:07

Hi SGaist,
I've read a lot of your post since I started with Qt one and a half year ago. I'll try to compiled on ubuntu.
I'll post again me results.
Thanks,

Atr0n · wrote on 22 Mar 2015, 12:09

While compiling there are too many errors... So I think I'm gonna wait until Qt 5.5 is released.

Atr0n · wrote on 18 Apr 2015, 14:38

Well, just installed the new 5.5 beta version and still no luck... Now my app crash.
If anyone has some advice to make this run, it will be appreciated!
Regards,

SGaist · wrote on 18 Apr 2015, 23:07

Do you have a backtrace of the crash ?

Atr0n · wrote on 20 Apr 2015, 21:02

Hi, sorry for the delay!
Here they are the first lines from the debugger:

Starting remote process.I/art     ( 2684): Late-enabling -Xcheck:jni
I/LoadedApk( 2684): No resource references to update in package common
I/LoadedApk( 2684): No resource references to update in package com.cyngn.hexo
W/ResourceType( 2684): For resource 0x01030224, entry index(548) is beyond type entryCount(9)
W/ResourceType( 2684): For resource 0x01030224, entry index(548) is beyond type entryCount(9)
I/Qt      ( 2684): qt start
D/        ( 2684): (null):0 ((null)): QML debugging is enabled. Only use this in a safe environment.
W/Qt A11Y ( 2684): Could not activate platform accessibility.
D/OpenGLRenderer( 2684): Render dirty regions requested: true
D/Atlas   ( 2684): Validating map...
I/Adreno-EGL( 2684): <qeglDrvAPI_eglInitialize:410>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.BF.1.1.1.C2.05.00.00.046.002_msm8974_LA.BF.1.1.1.C2__release_AU ()
I/Adreno-EGL( 2684): OpenGL ES Shader Compiler Version: E031.25.03.00
I/Adreno-EGL( 2684): Build Date: 01/06/15 Tue
I/Adreno-EGL( 2684): Local Branch: mybranch6793908
I/Adreno-EGL( 2684): Remote Branch: quic/LA.BF.1.1.1.c2
I/Adreno-EGL( 2684): Local Patches: NONE
I/Adreno-EGL( 2684): Reconstruct Branch: AU_LINUX_ANDROID_LA.BF.1.1.1.C2.05.00.00.046.002 +  NOTHING
I/OpenGLRenderer( 2684): Initialized EGL, version 1.4
D/OpenGLRenderer( 2684): Enabling debug mode 0
D/libNFCtest.so( 2684): ../NFCtest/nfcintent.cpp:20 (void NFCIntent::init()): false
I/Timeline( 2684): Timeline: Activity_idle id: android.os.BinderProxy@31a9db3f time:25527170
F/art     ( 2684): art/runtime/check_jni.cc:65] JNI DETECTED ERROR IN APPLICATION: JNI NewGlobalRef called with pending exception 'java.lang.RuntimeException' thrown in unknown throw location
F/art     ( 2684): art/runtime/check_jni.cc:65]     in call to NewGlobalRef
F/art     ( 2684): art/runtime/check_jni.cc:65] "QtThread" prio=5 tid=15 Runnable
F/art     ( 2684): art/runtime/check_jni.cc:65]   | group="main" sCount=0 dsCount=0 obj=0x12d2f0e0 self=0xa172f400
F/art     ( 2684): art/runtime/check_jni.cc:65]   | sysTid=2704 nice=0 cgrp=apps sched=0/0 handle=0xa24ed480
F/art     ( 2684): art/runtime/check_jni.cc:65]   | state=R schedstat=( 46736358 42323642 107 ) utm=4 stm=0 core=0 HZ=100
F/art     ( 2684): art/runtime/check_jni.cc:65]   | stack=0xa1b55000-0xa1b57000 stackSize=1012KB
F/art     ( 2684): art/runtime/check_jni.cc:65]   | held mutexes= "mutator lock"(shared held)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #00 pc 00004640  /system/lib/libbacktrace_libc++.so (UnwindCurrent::Unwind(unsigned int, ucontext*)+23)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #01 pc 00002e8d  /system/lib/libbacktrace_libc++.so (Backtrace::Unwind(unsigned int, ucontext*)+8)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #02 pc 0023ee95  /system/lib/libart.so (art::DumpNativeStack(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, int, char const*, art::mirror::ArtMethod*)+68)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #03 pc 0022432f  /system/lib/libart.so (art::Thread::Dump(std::__1::basic_ostream<char, std::__1::char_traits<char> >&) const+146)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #04 pc 000af913  /system/lib/libart.so (art::JniAbort(char const*, char const*)+582)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #05 pc 000b004d  /system/lib/libart.so (art::JniAbortF(char const*, char const*, ...)+60)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #06 pc 000b315d  /system/lib/libart.so (art::ScopedCheck::ScopedCheck(_JNIEnv*, int, char const*)+1284)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #07 pc 000b43c5  /system/lib/libart.so (art::CheckJNI::NewGlobalRef(_JNIEnv*, _jobject*)+20)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #08 pc 001b38ff  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Core.so (QJNIObjectPrivate::QJNIObjectPrivate(_jobject*)+82)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #09 pc 001b3ef5  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Core.so (???)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #10 pc 001b5fb1  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Core.so (QJNIObjectPrivate::getStaticObjectField(char const*, char const*, char const*)+48)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #11 pc 000194d1  /data/data/org.qtproject.nfc/qt-reserved-files/plugins/platforms/android/libqtforandroid.so (???)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #12 pc 0001ce53  /data/data/org.qtproject.nfc/qt-reserved-files/plugins/platforms/android/libqtforandroid.so (???)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #13 pc 000bfc55  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Quick.so (QSGRenderLoop::instance()+76)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #14 pc 000d6343  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Quick.so (QQuickWindowPrivate::init(QQuickWindow*, QQuickRenderControl*)+162)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #15 pc 000d6523  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Quick.so (QQuickWindow::QQuickWindow(QQuickWindowPrivate&, QWindow*)+30)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #16 pc 00136023  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Quick.so (QQuickWindowQmlImpl::QQuickWindowQmlImpl(QWindow*)+66)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #17 pc 00136115  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Quick.so (???)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #18 pc 00123c39  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Qml.so (QQmlType::create() const+34)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #19 pc 0014b407  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Qml.so (???)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #20 pc 0014bbfb  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Qml.so (???)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #21 pc 0011b657  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Qml.so (QQmlComponentPrivate::beginCreate(QQmlContextData*)+342)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #22 pc 0011a29d  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Qml.so (QQmlComponent::create(QQmlContext*)+56)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #23 pc 001458eb  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Qml.so (QQmlApplicationEnginePrivate::_q_finishLoad(QObject*)+194)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #24 pc 00145e97  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Qml.so (QQmlApplicationEnginePrivate::startLoad(QUrl const&, QByteArray const&, bool)+74)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #25 pc 00145eed  /data/app/org.qtproject.nfc-2/lib/arm/libQt5Qml.so (QQmlApplicationEngine::load(QUrl const&)+20)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #26 pc 00001a50  /data/app/org.qtproject.nfc-2/lib/arm/libNFCtest.so (main+156)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #27 pc 00019a79  /data/data/org.qtproject.nfc/qt-reserved-files/plugins/platforms/android/libqtforandroid.so (???)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #28 pc 00013a1b  /system/lib/libc.so (__pthread_start(void*)+30)
F/art     ( 2684): art/runtime/check_jni.cc:65]   native: #29 pc 00011a0f  /system/lib/libc.so (__start_thread+6)
F/art     ( 2684): art/runtime/check_jni.cc:65]   (no managed stack frames)
F/art     ( 2684): art/runtime/check_jni.cc:65] 
F/art     ( 2684): art/runtime/runtime.cc:284] Runtime aborting...

I'm not sure why Qt if complaining with this: JNI DETECTED ERROR IN APPLICATION: JNI NewGlobalRef called with pending exception 'java.lang.RuntimeException' thrown in unknown throw location.

Maybe I'm not creating the JNI object as it should. Here is my code:

main.cpp

int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);

QQmlApplicationEngine engine;
NFCIntent mynfc;
mynfc.init();
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

return app.exec();

}
init function

void NFCIntent::init()
{
    QAndroidJniObject* nfc = new QAndroidJniObject("org/atron/nfc/MainActivity");
    qDebug() << nfc->isValid();
}