Squashed code contribtion for QtNfc on Android

The code was contributed by
Juhana Jauhiainen <juhana.jauhiainen@gmail.com>
osaukko <osaukko@gmail.com>
waz <markus.liuska@gmail.fi>

List of squashed commits:

Preliminary Android support to QtNFC.

Only receiving Ndef messages to QNearFieldManager.

QNearFieldTarget and LLCP classes need to be implemented for Android

------------------

Added Android buildsettings to nfc.pro
Including Android implementation in QNearFieldManager.h

------------------

QtNfc namespace removed.

------------------

Added Android support to QNearFieldManager::isAvailable() method

------------------

Improved isAvailable method

------------------

Fix QtNfc java module

Added checking for NfcAdapter object so that calling QNearFieldManager::startTargetDetection()
and QNearFieldManager::stopTargetDetection() methods will not crash application.

------------------

Added support for tag types.

NFC tag type is now included in onNdefDiscovered() method call.
Only showing information in debug messages for now.

------------------

Fixing missing return values and releasing acquired resources.

------------------

First proof of concept version of target creation for android.

------------------

Fix for include guards.

------------------

Added QHash container for NearFieldmanager

Added QHash container for NearFieldManager which holds each discovered targets.
Also added setters for NearFieldTarget.

------------------

Using signals and slots to move target information to main thread.

Fixes problem when creating new targets as child of manager.

------------------

Fix for tag detection for tags without NDEF messages

Tag type checking is not working if there is no NDEF messages currently.
Need to find way to check tag type without Ndef object.

------------------

Added error reporting for QNearFieldTarget::readNdefMessages (Android)

------------------

Registering type name for QNearFieltTarget.

Small refactoring for QNearFieldTarget android implementation.

------------------

Sending UID as bytearray.

Also debug messages to show tech list added into QtNfc.java.

------------------

Trying different approach for android version of QtNfc module.

In this approach we pass through intent object(Java) to NearFieldTarget object(c++).

------------------

	Fixed nfc.pro so QtNfc.jar is built.

------------------

Added tech list into android version of QNearFieldTarget

Could be used to detect availability of NDEF messages and also to detect tag type.

------------------

	Fixed build files so both the C++ and Java libraries are built correctly.

------------------

	Support for writing Ndef messages.

------------------

Implementation for NearFieldTarget::hasNdefMessage().

Also nice debug messages to show available technologies for current tag.

------------------

	Support for NdefFormatable tags.

------------------

	Support for writing NdefFormatable tags.

------------------

	Removed debug messages.

------------------

    Implemented type() method to Android's QNearFieldTarget.

Conflicts:
	src/nfc/qnearfieldtarget_android.cpp
	src/nfc/qnearfieldtarget_android_p.h

------------------

Small fixes to remove some of the warnings.

Conflicts:
	src/nfc/qnearfieldtarget_android.cpp
	src/nfc/qnearfieldtarget_android_p.h

------------------

Committing test code for targetLost signal (Because of Merge)

Conflicts:
	src/nfc/qnearfieldtarget_android.cpp
	src/nfc/qnearfieldtarget_android_p.h

------------------

Added support for target lost signal

------------------

    Using QString::fromUtf8 instead of QString()

Conflicts:
	src/nfc/qnearfieldtarget_android.cpp

------------------

    Fixed bug with targetLost not emitting when reading or writing Ndef
    messages.

    Added some untested code for sendCommand.

------------------

Refactoring.

Conflicts:
	src/nfc/qnearfieldtarget_android_p.h

------------------

Refactoring and fixes.

------------------

Less debug messages.

------------------

Refactoring and cleaning.

Conflicts:
	src/android/android.pro
	src/nfc/neard/neard_helper_p.h
	src/nfc/nfc.pro
	src/nfc/qdeclarativendefrecord.cpp
	src/nfc/qdeclarativendefrecord.h
	src/nfc/qllcpserver_p.h
	src/nfc/qllcpsocket.h
	src/nfc/qndefmessage.h
	src/nfc/qndefnfcsmartposterrecord_p.h
	src/nfc/qnearfieldmanager.cpp
	src/nfc/qnearfieldmanager_neard_p.h
	src/nfc/qnearfieldtarget.h
	src/nfc/qnfcglobal.h
	src/src.pro
	tests/nfctestserver/socketcontroller.h

Change-Id: Ideb4c8c8064f46b431532ea4870207691bc49c99
Reviewed-by: Peter Rustler <peter.rustler@basyskom.com>
Reviewed-by: Frank Meerkoetter <frank.meerkoetter@basyskom.com>
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>

1 files changed, 496 insertions, 0 deletions

diff --git a/src/nfc/qnearfieldtarget_android.cpp b/src/nfc/qnearfieldtarget_android.cpp
new file mode 100644
index 00000000..18dbaaec
--- /dev/null
+++ b/src/nfc/qnearfieldtarget_android.cpp
@@ -0,0 +1,496 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Centria research and development
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtNfc module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qnearfieldtarget_android_p.h"
+#include "android/androidjninfc_p.h"
+#include "qdebug.h"
+
+const QString NearFieldTarget::NdefTechology = QString::fromUtf8("android.nfc.tech.Ndef");
+const QString NearFieldTarget::NdefFormatableTechnology = QString::fromUtf8("android.nfc.tech.NdefFormatable");
+const QString NearFieldTarget::NfcATechnology = QString::fromUtf8("android.nfc.tech.NfcA");
+const QString NearFieldTarget::NfcBTechnology = QString::fromUtf8("android.nfc.tech.NfcB");
+const QString NearFieldTarget::NfcFTechnology = QString::fromUtf8("android.nfc.tech.NfcF");
+const QString NearFieldTarget::NfcVTechnology = QString::fromUtf8("android.nfc.tech.NfcV");
+const QString NearFieldTarget::MifareClassicTechnology = QString::fromUtf8("android.nfc.tech.MifareClassic");
+const QString NearFieldTarget::MifareUltralightTechnology = QString::fromUtf8("android.nfc.tech.MifareUltralight");
+
+
+NearFieldTarget::NearFieldTarget(jobject intent, const QByteArray uid, QObject *parent) :
+    QNearFieldTarget(parent),
+    m_intent(intent),
+    m_uid(uid)
+{
+    updateTechList();
+    updateType();
+    setupTargetCheckTimer();
+}
+
+NearFieldTarget::~NearFieldTarget()
+{
+    releaseIntent();
+    emit targetDestroyed(m_uid);
+}
+
+QByteArray NearFieldTarget::uid() const
+{
+    return m_uid;
+}
+
+QNearFieldTarget::Type NearFieldTarget::type() const
+{
+    return m_type;
+}
+
+QNearFieldTarget::AccessMethods NearFieldTarget::accessMethods() const
+{
+    AccessMethods result = NdefAccess;
+    return result;
+}
+
+bool NearFieldTarget::hasNdefMessage()
+{
+    return m_techList.contains(NdefTechology);
+}
+
+QNearFieldTarget::RequestId NearFieldTarget::readNdefMessages()
+{
+    // Making sure that target has NDEF messages
+    if (!hasNdefMessage())
+        return QNearFieldTarget::RequestId();
+
+    // Making sure that target is still in range
+    QNearFieldTarget::RequestId requestId(new QNearFieldTarget::RequestIdPrivate);
+    if (m_intent == 0) {
+        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
+                                  Q_ARG(QNearFieldTarget::Error, QNearFieldTarget::TargetOutOfRangeError),
+                                  Q_ARG(const QNearFieldTarget::RequestId&, requestId));
+        return requestId;
+    }
+
+    // Getting Ndef technology object
+    AndroidNfc::AttachedJNIEnv aenv;
+    JNIEnv *env = aenv.jniEnv;
+    Q_ASSERT_X(env != 0, "readNdefMessages", "env pointer is null");
+    jobject ndef = getTagTechnology(NdefTechology, env);
+    if (ndef == 0) {
+        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
+                                  Q_ARG(QNearFieldTarget::Error, QNearFieldTarget::UnsupportedError),
+                                  Q_ARG(const QNearFieldTarget::RequestId&, requestId));
+        return requestId;
+    }
+
+    // Connect
+    jclass ndefClass = env->GetObjectClass(ndef);
+    jmethodID connectMID = env->GetMethodID(ndefClass, "connect", "()V");
+    env->CallVoidMethod(ndef, connectMID);
+    if (catchJavaExceptions(env)) {
+        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
+                                  Q_ARG(QNearFieldTarget::Error, QNearFieldTarget::TargetOutOfRangeError),
+                                  Q_ARG(const QNearFieldTarget::RequestId&, requestId));
+        return requestId;
+    }
+
+    // Get NdefMessage object
+    jmethodID getNdefMessageMID = env->GetMethodID(ndefClass, "getNdefMessage", "()Landroid/nfc/NdefMessage;");
+    jobject ndefMessage = env->CallObjectMethod(ndef, getNdefMessageMID);
+    if (catchJavaExceptions(env))
+        ndefMessage = 0;
+    if (ndefMessage == 0) {
+        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
+                                  Q_ARG(QNearFieldTarget::Error, QNearFieldTarget::NdefReadError),
+                                  Q_ARG(const QNearFieldTarget::RequestId&, requestId));
+        return requestId;
+    }
+
+    // Convert to byte array
+    jclass ndefMessageClass = env->GetObjectClass(ndefMessage);
+    jmethodID toByteArrayMID = env->GetMethodID(ndefMessageClass, "toByteArray", "()[B");
+    jbyteArray ndefMessageBA = reinterpret_cast<jbyteArray>(env->CallObjectMethod(ndefMessage, toByteArrayMID));
+    QByteArray ndefMessageQBA = jbyteArrayToQByteArray(ndefMessageBA, env);
+
+    // Closing connection
+    jmethodID closeMID = env->GetMethodID(ndefClass, "close", "()V");
+    env->CallVoidMethod(ndef, closeMID);
+    catchJavaExceptions(env);   // IOException at this point does not matter anymore.
+
+    // Sending QNdefMessage, requestCompleted and exit.
+    QNdefMessage qNdefMessage = QNdefMessage::fromByteArray(ndefMessageQBA);
+    QMetaObject::invokeMethod(this, "ndefMessageRead", Qt::QueuedConnection,
+                              Q_ARG(const QNdefMessage&, qNdefMessage));
+    QMetaObject::invokeMethod(this, "requestCompleted", Qt::QueuedConnection,
+                              Q_ARG(const QNearFieldTarget::RequestId&, requestId));
+    return requestId;
+}
+
+
+QNearFieldTarget::RequestId NearFieldTarget::sendCommand(const QByteArray &command)
+{
+    Q_UNUSED(command);
+    Q_EMIT QNearFieldTarget::error(QNearFieldTarget::UnsupportedError, QNearFieldTarget::RequestId());
+    return QNearFieldTarget::RequestId();
+
+    //Not supported for now
+    /*if (command.size() == 0) {
+        Q_EMIT QNearFieldTarget::error(QNearFieldTarget::InvalidParametersError, QNearFieldTarget::RequestId());
+        return QNearFieldTarget::RequestId();
+    }
+
+    AndroidNfc::AttachedJNIEnv aenv;
+    JNIEnv *env = aenv.jniEnv;
+
+    jobject tagTech;
+    if (m_techList.contains(NfcATechnology)) {
+        tagTech = getTagTechnology(NfcATechnology);
+    } else if (m_techList.contains(NfcBTechnology)) {
+        tagTech = getTagTechnology(NfcBTechnology);
+    } else if (m_techList.contains(NfcFTechnology)) {
+        tagTech = getTagTechnology(NfcFTechnology);
+    } else if (m_techList.contains(NfcVTechnology)) {
+        tagTech = getTagTechnology(NfcVTechnology);
+    } else {
+        Q_EMIT QNearFieldTarget::error(QNearFieldTarget::UnsupportedError, QNearFieldTarget::RequestId());
+        return QNearFieldTarget::RequestId();
+    }
+
+    QByteArray ba(ba);
+
+    jclass techClass = env->GetObjectClass(tagTech);
+    jmethodID tranceiveMID = env->GetMethodID(techClass, "tranceive", "([B)[B");
+    Q_ASSERT_X(tranceiveMID != 0, "sendCommand", "could not find tranceive method");
+
+    jbyteArray jba = env->NewByteArray(ba.size());
+    env->SetByteArrayRegion(jba, 0, ba.size(), reinterpret_cast<jbyte*>(ba.data()));
+
+    jbyteArray rsp = reinterpret_cast<jbyteArray>(env->CallObjectMethod(tagTech, tranceiveMID, jba));
+
+    jsize len = env->GetArrayLength(rsp);
+    QByteArray rspQBA;
+    rspQBA.resize(len);
+
+    env->GetByteArrayRegion(rsp, 0, len, reinterpret_cast<jbyte*>(rspQBA.data()));
+
+    qDebug() << "Send command returned QBA size: " << rspQBA.size();
+
+
+    env->DeleteLocalRef(jba);
+
+
+    return QNearFieldTarget::RequestId();*/
+}
+
+QNearFieldTarget::RequestId NearFieldTarget::sendCommands(const QList<QByteArray> &commands)
+{
+    QNearFieldTarget::RequestId requestId;
+    for (int i=0; i < commands.size(); i++){
+        requestId = sendCommand(commands.at(i));
+    }
+    return requestId;
+}
+
+QNearFieldTarget::RequestId NearFieldTarget::writeNdefMessages(const QList<QNdefMessage> &messages)
+{
+    if (messages.size() == 0)
+        return QNearFieldTarget::RequestId();
+
+    if (messages.size() > 1)
+        qWarning("QNearFieldTarget::writeNdefMessages: Android supports writing only one NDEF message per tag.");
+
+    AndroidNfc::AttachedJNIEnv aenv;
+    JNIEnv *env = aenv.jniEnv;
+    jmethodID writeMethod;
+    jobject tagTechnology;
+    jclass tagClass;
+
+    // Getting write method
+    if (m_techList.contains(NdefFormatableTechnology)) {
+        tagTechnology = getTagTechnology(NdefFormatableTechnology, env);
+        tagClass = env->GetObjectClass(tagTechnology);
+        writeMethod = env->GetMethodID(tagClass, "format", "(Landroid/nfc/NdefMessage;)V");
+    } else if (m_techList.contains(NdefTechology)) {
+        tagTechnology = getTagTechnology(NdefTechology, env);
+        tagClass = env->GetObjectClass(tagTechnology);
+        writeMethod = env->GetMethodID(tagClass, "writeNdefMessage", "(Landroid/nfc/NdefMessage;)V");
+    } else {
+        // An invalid request id will be returned if the target does not support writing NDEF messages.
+        return QNearFieldTarget::RequestId();
+    }
+
+    // Connecting
+    QNearFieldTarget::RequestId requestId = QNearFieldTarget::RequestId(new QNearFieldTarget::RequestIdPrivate());
+    jclass ndefMessageClass = env->FindClass("android/nfc/NdefMessage");
+    jmethodID connectMethodID = env->GetMethodID(tagClass, "connect", "()V");
+    env->CallVoidMethod(tagTechnology, connectMethodID);
+    if (catchJavaExceptions(env)) {
+        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
+                                  Q_ARG(QNearFieldTarget::Error, QNearFieldTarget::TargetOutOfRangeError),
+                                  Q_ARG(const QNearFieldTarget::RequestId&, requestId));
+        return requestId;
+    }
+
+    // Making NdefMessage object
+    jmethodID ndefMessageInitMID = env->GetMethodID(ndefMessageClass, "<init>", "([B)V");
+    const QNdefMessage &message = messages.first();
+    QByteArray ba = message.toByteArray();
+    jbyteArray jba = env->NewByteArray(ba.size());
+    env->SetByteArrayRegion(jba, 0, ba.size(), reinterpret_cast<jbyte*>(ba.data()));
+    jobject jmessage = env->NewObject(ndefMessageClass, ndefMessageInitMID, jba);
+    if (catchJavaExceptions(env)) {
+        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
+                                  Q_ARG(QNearFieldTarget::Error, QNearFieldTarget::UnknownError),
+                                  Q_ARG(const QNearFieldTarget::RequestId&, requestId));
+        return requestId;
+    }
+
+    // Writing
+    env->CallVoidMethod(tagTechnology, writeMethod, jmessage);
+    bool gotException = catchJavaExceptions(env);
+    env->DeleteLocalRef(jba);
+    env->DeleteLocalRef(jmessage);
+    if (gotException) {
+        QMetaObject::invokeMethod(this, "error", Qt::QueuedConnection,
+                                  Q_ARG(QNearFieldTarget::Error, QNearFieldTarget::NdefWriteError),
+                                  Q_ARG(const QNearFieldTarget::RequestId&, requestId));
+        return requestId;
+    }
+
+    // Closing connection, sending signal and exit
+    jmethodID closeMID = env->GetMethodID(tagClass, "close", "()V");
+    env->CallVoidMethod(tagTechnology, closeMID);
+    catchJavaExceptions(env);   // IOException at this point does not matter anymore.
+    QMetaObject::invokeMethod(this, "ndefMessagesWritten", Qt::QueuedConnection);
+    return requestId;
+}
+
+void NearFieldTarget::setIntent(jobject intent)
+{
+    if (m_intent == intent)
+        return;
+
+    releaseIntent();
+    m_intent = intent;
+    if (m_intent) {
+        // Updating tech list and type in case of there is another tag with same UID as one before.
+        updateTechList();
+        updateType();
+        m_targetCheckTimer->start();
+    }
+}
+
+void NearFieldTarget::checkIsTargetLost()
+{
+    if (m_intent == 0 || m_techList.isEmpty()) {
+        handleTargetLost();
+        return;
+    }
+
+    AndroidNfc::AttachedJNIEnv aenv;
+    JNIEnv *env = aenv.jniEnv;
+
+    // Using first available technology to check connection
+    QString techStr = m_techList.first();
+    jobject tagTechObj = getTagTechnology(techStr, env);
+    jclass tagTechClass = env->GetObjectClass(tagTechObj);
+    jmethodID connectMID = env->GetMethodID(tagTechClass, "connect","()V");
+    jmethodID closeMID = env->GetMethodID(tagTechClass, "close","()V");
+
+    env->CallObjectMethod(tagTechObj, connectMID);
+    if (catchJavaExceptions(env)) {
+        handleTargetLost();
+        return;
+    }
+    env->CallObjectMethod(tagTechObj, closeMID);
+    if (catchJavaExceptions(env))
+        handleTargetLost();
+}
+
+void NearFieldTarget::releaseIntent()
+{
+    m_targetCheckTimer->stop();
+
+    if (m_intent == 0)
+        return;
+
+    AndroidNfc::AttachedJNIEnv aenv;
+    Q_ASSERT_X(aenv.jniEnv != 0, "releaseIntent", "aenv.jniEnv pointer is null");
+    aenv.jniEnv->DeleteGlobalRef(m_intent);
+    m_intent = 0;
+}
+
+void NearFieldTarget::updateTechList()
+{
+    if (m_intent == 0)
+        return;
+
+    // Getting tech list
+    AndroidNfc::AttachedJNIEnv aenv;
+    JNIEnv *env = aenv.jniEnv;
+    jobject tag = AndroidNfc::getTag(env, m_intent);
+    jclass tagClass = env->GetObjectClass(tag);
+    jmethodID techListMID = env->GetMethodID(tagClass, "getTechList", "()[Ljava/lang/String;");
+    jobjectArray techListArray = reinterpret_cast<jobjectArray>(env->CallObjectMethod(tag, techListMID));
+    if (techListArray == 0) {
+        handleTargetLost();
+        return;
+    }
+
+    // Converting tech list array to QStringList.
+    m_techList.clear();
+    jsize techCount = env->GetArrayLength(techListArray);
+    for (jsize i = 0; i < techCount; ++i) {
+        jstring tech = reinterpret_cast<jstring>(env->GetObjectArrayElement(techListArray, i));
+        const char *techStr = env->GetStringUTFChars(tech, JNI_FALSE);
+        m_techList.append(QString::fromUtf8(techStr));
+        env->ReleaseStringUTFChars(tech, techStr);
+    }
+}
+
+void NearFieldTarget::updateType()
+{
+    m_type = getTagType();
+}
+
+QNearFieldTarget::Type NearFieldTarget::getTagType() const
+{
+    AndroidNfc::AttachedJNIEnv aenv;
+    JNIEnv *env = aenv.jniEnv;
+    Q_ASSERT_X(env != 0, "type", "env pointer is null");
+
+    if (m_techList.contains(NdefTechology)) {
+        jobject ndef = getTagTechnology(NdefTechology, env);
+        jclass ndefClass = env->GetObjectClass(ndef);
+
+        jmethodID typeMethodID = env->GetMethodID(ndefClass, "getType", "()Ljava/lang/String;");
+        jstring jtype = reinterpret_cast<jstring>(env->CallObjectMethod(ndef, typeMethodID));
+        const char *type_data = env->GetStringUTFChars(jtype, JNI_FALSE);
+        QString qtype = QString::fromUtf8(type_data);
+        env->ReleaseStringUTFChars(jtype, type_data);
+
+        QHash<QString, Type> types;
+        types.insert(QString::fromUtf8("com.nxp.ndef.mifareclassic"), MifareTag);
+        types.insert(QString::fromUtf8("org.nfcforum.ndef.type1"), NfcTagType1);
+        types.insert(QString::fromUtf8("org.nfcforum.ndef.type2"), NfcTagType2);
+        types.insert(QString::fromUtf8("org.nfcforum.ndef.type3"), NfcTagType3);
+        types.insert(QString::fromUtf8("org.nfcforum.ndef.type4"), NfcTagType4);
+        if (!types.contains(qtype))
+            return ProprietaryTag;
+        return types[qtype];
+    } else if (m_techList.contains(NfcATechnology)) {
+        if (m_techList.contains(MifareClassicTechnology))
+            return MifareTag;
+
+        // Checking ATQA/SENS_RES
+        // xxx0 0000  xxxx xxxx: Identifies tag Type 1 platform
+        jobject nfca = getTagTechnology(NfcATechnology, env);
+        jclass nfcaClass = env->GetObjectClass(nfca);
+        jmethodID atqaMethodID = env->GetMethodID(nfcaClass, "getAtqa", "()[B");
+        jbyteArray atqaBA = reinterpret_cast<jbyteArray>(env->CallObjectMethod(nfca, atqaMethodID));
+        QByteArray atqaQBA = jbyteArrayToQByteArray(atqaBA, env);
+        if (atqaQBA.isEmpty())
+            return ProprietaryTag;
+        if ((atqaQBA[0] & 0x1F) == 0x00)
+            return NfcTagType1;
+
+        // Checking SAK/SEL_RES
+        // xxxx xxxx  x00x x0xx: Identifies tag Type 2 platform
+        // xxxx xxxx  x01x x0xx: Identifies tag Type 4 platform
+        jmethodID sakMethodID = env->GetMethodID(nfcaClass, "getSak", "()S");
+        jshort sakS = env->CallShortMethod(nfca, sakMethodID);
+        if ((sakS & 0x0064) == 0x0000)
+            return NfcTagType2;
+        else if ((sakS & 0x0064) == 0x0020)
+            return NfcTagType4;
+        return ProprietaryTag;
+    } else if (m_techList.contains(NfcBTechnology)) {
+        return NfcTagType4;
+    } else if (m_techList.contains(NfcFTechnology)) {
+        return NfcTagType3;
+    }
+
+    return ProprietaryTag;
+}
+
+void NearFieldTarget::setupTargetCheckTimer()
+{
+    m_targetCheckTimer = new QTimer(this);
+    m_targetCheckTimer->setInterval(1000);
+    connect(m_targetCheckTimer, SIGNAL(timeout()), this, SLOT(checkIsTargetLost()));
+    m_targetCheckTimer->start();
+}
+
+void NearFieldTarget::handleTargetLost()
+{
+    releaseIntent();
+    emit targetLost(this);
+}
+
+jobject NearFieldTarget::getTagTechnology(const QString &tech, JNIEnv *env) const
+{
+    QString techClass(tech);
+    techClass.replace(QLatin1Char('.'), QLatin1Char('/'));
+
+    // Getting requested technology
+    jobject tag = AndroidNfc::getTag(env, m_intent);
+    jclass tagClass = env->FindClass(techClass.toUtf8().constData());
+    const QString sig = QString::fromUtf8("(Landroid/nfc/Tag;)L%1;");
+    jmethodID getTagMethodID = env->GetStaticMethodID(tagClass, "get", sig.arg(techClass).toUtf8().constData());
+    jobject tagtech = env->CallStaticObjectMethod(tagClass, getTagMethodID, tag);
+    return tagtech;
+}
+
+QByteArray NearFieldTarget::jbyteArrayToQByteArray(const jbyteArray &byteArray, JNIEnv *env) const
+{
+    QByteArray resultArray;
+    jsize len = env->GetArrayLength(byteArray);
+    resultArray.resize(len);
+    env->GetByteArrayRegion(byteArray, 0, len, reinterpret_cast<jbyte*>(resultArray.data()));
+    return resultArray;
+}
+
+bool NearFieldTarget::catchJavaExceptions(JNIEnv *env) const
+{
+    jthrowable exc = env->ExceptionOccurred();
+    if (exc) {
+        env->ExceptionDescribe();
+        env->ExceptionClear();
+        return true;
+    }
+    return false;
+}