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Android BT: pull the pairing data from a device

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As Qt is not able to pull the pairing data from a device, a lengthy
discovery process is needed to see what devices are paired. On
https://forum.qt.io/topic/46075/solved-bluetooth-list-paired-devices
user s.frings74 does, however, present a solution to this using JNI.
Currently, this code is taken "as is".

Currently, only for Android (so not mobile-on-desktop, or even desktop).
And only generating logging data in the logcat.

Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
This commit is contained in:
Jan Mulder 2017-06-01 20:07:19 +02:00 committed by Dirk Hohndel
parent ec34ebfb04
commit ed392694db
2 changed files with 86 additions and 0 deletions
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77
mobile-widgets/qmlmanager.cpp
View file

@ -11,6 +11,10 @@
#include <QApplication>
#include <QElapsedTimer>
#include <QTimer>
#if defined(Q_OS_ANDROID)
#include <QAndroidJniObject>
#include <QAndroidJniEnvironment>
#endif
#include "qt-models/divelistmodel.h"
#include "qt-models/gpslistmodel.h"
@ -92,6 +96,12 @@ QMLManager::QMLManager() : m_locationServiceEnabled(false),
#if defined(BT_SUPPORT)
if (localBtDevice.isValid()) {
localBtDevice.powerOn();
QStringList pairedBT = getBluetoothDevices();
for (int i = 0; i < pairedBT.length(); i++) {
qDebug() << "Paired = " << pairedBT[i];
}
QString localDeviceName = "localDevice " + localBtDevice.name() + " is valid, starting discovery";
appendTextToLog(localDeviceName.toUtf8().data());
discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
@ -1597,3 +1607,70 @@ QStringList QMLManager::getDCListFromVendor(const QString& vendor)
{
return productList[vendor];
}
//
// As Qt is not able to pull the pairing data from a device, a lengthy
// discovery process is needed to see what devices are paired. On
// https://forum.qt.io/topic/46075/solved-bluetooth-list-paired-devices
// user s.frings74 does, however, present a solution to this using JNI.
// Currently, this code is taken "as is".
//
QStringList QMLManager::getBluetoothDevices()
{
QStringList result;
#if defined(Q_OS_ANDROID)
QString fmt("%1 %2");
// Query via Android Java API.
// returns a BluetoothAdapter
QAndroidJniObject adapter=QAndroidJniObject::callStaticObjectMethod("android/bluetooth/BluetoothAdapter","getDefaultAdapter","()Landroid/bluetooth/BluetoothAdapter;");
if (checkException("BluetoothAdapter.getDefaultAdapter()", &adapter)) {
return result;
}
// returns a Set<BluetoothDevice>
QAndroidJniObject pairedDevicesSet=adapter.callObjectMethod("getBondedDevices","()Ljava/util/Set;");
if (checkException("BluetoothAdapter.getBondedDevices()", &pairedDevicesSet)) {
return result;
}
jint size=pairedDevicesSet.callMethod<jint>("size");
checkException("Set<BluetoothDevice>.size()", &pairedDevicesSet);
if (size > 0) {
// returns an Iterator<BluetoothDevice>
QAndroidJniObject iterator=pairedDevicesSet.callObjectMethod("iterator","()Ljava/util/Iterator;");
if (checkException("Set<BluetoothDevice>.iterator()", &iterator)) {
return result;
}
for (int i = 0; i < size; i++) {
// returns a BluetoothDevice
QAndroidJniObject dev=iterator.callObjectMethod("next","()Ljava/lang/Object;");
if (checkException("Iterator<BluetoothDevice>.next()", &dev)) {
continue;
}
QString address=dev.callObjectMethod("getAddress","()Ljava/lang/String;").toString(); // returns a String
QString name=dev.callObjectMethod("getName", "()Ljava/lang/String;").toString(); // returns a String
result.append(fmt.arg(address).arg(name));
}
}
#endif
return result;
}
#if defined(Q_OS_ANDROID)
bool QMLManager::checkException(const char* method, const QAndroidJniObject *obj)
{
static QAndroidJniEnvironment env;
bool result = false;
if (env->ExceptionCheck()) {
qCritical("Exception in %s", method);
env->ExceptionDescribe();
env->ExceptionClear();
result=true;
}
if (!(obj == NULL || obj->isValid())) {
qCritical("Invalid object returned by %s", method);
result=true;
}
return result;
}
#endif

9
mobile-widgets/qmlmanager.h
View file

@ -12,6 +12,9 @@
#include <QBluetoothDeviceDiscoveryAgent>
#include <QBluetoothUuid>
#endif
#if defined(Q_OS_ANDROID)
#include <QAndroidJniObject>
#endif
#include "core/gpslocation.h"
#include "qt-models/divelistmodel.h"
@ -125,6 +128,7 @@ public:
#if defined(BT_SUPPORT)
void btDeviceDiscovered(const QBluetoothDeviceInfo &device);
#endif
QStringList getBluetoothDevices();
public slots:
void applicationStateChanged(Qt::ApplicationState state);
@ -207,6 +211,11 @@ private:
bool checkDepth(DiveObjectHelper *myDive, struct dive *d, QString depth);
bool currentGitLocalOnly;
bool m_showPin;
#if defined(Q_OS_ANDROID)
bool checkException(const char* method, const QAndroidJniObject* obj);
#endif
#if defined(BT_SUPPORT)
QBluetoothLocalDevice localBtDevice;
QBluetoothDeviceDiscoveryAgent *discoveryAgent;