Android: Add ability to (dis)connect to BTLE devices on Android

and keep tracking the connection state

Change-Id: If4d05fa18c78802ae06096884fba78eed123e77f
Reviewed-by: Timur Pocheptsov <Timur.Pocheptsov@digia.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>

4 files changed, 197 insertions, 2 deletions

diff --git a/src/bluetooth/android/android.pri b/src/bluetooth/android/android.pri
index 0507894f..c50a919a 100644
--- a/src/bluetooth/android/android.pri
+++ b/src/bluetooth/android/android.pri
@@ -5,7 +5,8 @@ PRIVATE_HEADERS +=  \
         android/androidbroadcastreceiver_p.h \
         android/localdevicebroadcastreceiver_p.h \
         android/serveracceptancethread_p.h \
-        android/jni_android_p.h
+        android/jni_android_p.h \
+        android/lowenergynotificationhub_p.h
 
 
 SOURCES += \
@@ -15,4 +16,5 @@ SOURCES += \
         android/jni_android.cpp \
         android/androidbroadcastreceiver.cpp \
         android/localdevicebroadcastreceiver.cpp \
-        android/serveracceptancethread.cpp
+        android/serveracceptancethread.cpp \
+        android/lowenergynotificationhub.cpp
diff --git a/src/bluetooth/android/jni_android.cpp b/src/bluetooth/android/jni_android.cpp
index 061d6ce2..6fffc018 100644
--- a/src/bluetooth/android/jni_android.cpp
+++ b/src/bluetooth/android/jni_android.cpp
@@ -40,6 +40,7 @@
 #include "android/androidbroadcastreceiver_p.h"
 #include "android/serveracceptancethread_p.h"
 #include "android/inputstreamthread_p.h"
+#include "android/lowenergynotificationhub_p.h"
 
 Q_DECLARE_LOGGING_CATEGORY(QT_BT_ANDROID)
 
@@ -198,6 +199,8 @@ static JNINativeMethod methods[] = {
 static JNINativeMethod methods_le[] = {
     {"leScanResult", "(JLandroid/bluetooth/BluetoothDevice;I)V",
                 (void *) QtBluetoothLE_leScanResult},
+    {"leConnectionStateChange", "(JII)V",
+                (void *) LowEnergyNotificationHub::lowEnergy_connectionChange},
 };
 
 static JNINativeMethod methods_server[] = {
diff --git a/src/bluetooth/android/lowenergynotificationhub.cpp b/src/bluetooth/android/lowenergynotificationhub.cpp
new file mode 100644
index 00000000..d662cd5b
--- /dev/null
+++ b/src/bluetooth/android/lowenergynotificationhub.cpp
@@ -0,0 +1,110 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtBluetooth module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "lowenergynotificationhub_p.h"
+
+#include <QtCore/QHash>
+#include <QtCore/QLoggingCategory>
+#include <QtCore/QTime>
+#include <QtAndroidExtras/QAndroidJniEnvironment>
+
+QT_BEGIN_NAMESPACE
+
+typedef QHash<long, LowEnergyNotificationHub*> HubMapType;
+Q_GLOBAL_STATIC(HubMapType, hubMap)
+
+QReadWriteLock LowEnergyNotificationHub::lock;
+
+Q_DECLARE_LOGGING_CATEGORY(QT_BT_ANDROID)
+
+LowEnergyNotificationHub::LowEnergyNotificationHub(
+        const QBluetoothAddress &remote, QObject *parent)
+    :   QObject(parent), javaToCtoken(0)
+{
+    QAndroidJniEnvironment env;
+    const QAndroidJniObject address =
+            QAndroidJniObject::fromString(remote.toString());
+    jBluetoothLe = QAndroidJniObject("org/qtproject/qt5/android/bluetooth/QtBluetoothLE",
+                                     "(Ljava/lang/String;Landroid/app/Activity;)V",
+                                     address.object<jstring>(),
+                                     QtAndroidPrivate::activity());
+
+
+    if (env->ExceptionCheck() || !jBluetoothLe.isValid()) {
+        env->ExceptionDescribe();
+        env->ExceptionClear();
+        jBluetoothLe = QAndroidJniObject();
+        return;
+    }
+
+    // register C++ class pointer in Java
+    qsrand(QTime::currentTime().msec());
+    lock.lockForWrite();
+
+    while (true) {
+        javaToCtoken = qrand();
+        if (!hubMap()->contains(javaToCtoken))
+            break;
+    }
+
+    hubMap()->insert(javaToCtoken, this);
+    lock.unlock();
+
+    jBluetoothLe.setField<jlong>("qtObject", javaToCtoken);
+}
+
+LowEnergyNotificationHub::~LowEnergyNotificationHub()
+{
+    lock.lockForWrite();
+    hubMap()->remove(javaToCtoken);
+    lock.unlock();
+}
+
+// runs in Java thread
+void LowEnergyNotificationHub::lowEnergy_connectionChange(
+        JNIEnv *, jobject, jlong qtObject, jint errorCode, jint newState)
+{
+    lock.lockForRead();
+    LowEnergyNotificationHub *hub = hubMap()->value(qtObject);
+    lock.unlock();
+    if (!hub)
+        return;
+
+    QMetaObject::invokeMethod(hub, "connectionUpdated", Qt::QueuedConnection,
+                              Q_ARG(QLowEnergyController::ControllerState,
+                                    (QLowEnergyController::ControllerState)newState),
+                              Q_ARG(QLowEnergyController::Error,
+                                    (QLowEnergyController::Error)errorCode));
+}
+
+QT_END_NAMESPACE
diff --git a/src/bluetooth/android/lowenergynotificationhub_p.h b/src/bluetooth/android/lowenergynotificationhub_p.h
new file mode 100644
index 00000000..68999a3e
--- /dev/null
+++ b/src/bluetooth/android/lowenergynotificationhub_p.h
@@ -0,0 +1,80 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtBluetooth module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef LOWENERGYNOTIFICATIONHUB_H
+#define LOWENERGYNOTIFICATIONHUB_H
+
+#include <QtCore/QObject>
+#include <QtCore/QReadWriteLock>
+#include <QtCore/private/qjnihelpers_p.h>
+#include <QtAndroidExtras/QAndroidJniObject>
+#include <QtBluetooth/QBluetoothAddress>
+#include <jni.h>
+
+#include "qlowenergycontroller_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class LowEnergyNotificationHub : public QObject
+{
+    Q_OBJECT
+public:
+    explicit LowEnergyNotificationHub(const QBluetoothAddress &remote,
+                                      QObject *parent = 0);
+    ~LowEnergyNotificationHub();
+
+    static void lowEnergy_connectionChange(JNIEnv*, jobject, jlong qtObject,
+                                           jint errorCode, jint newState);
+
+    QAndroidJniObject javaObject()
+    {
+        return jBluetoothLe;
+    }
+
+signals:
+    void connectionUpdated(QLowEnergyController::ControllerState newState,
+                           QLowEnergyController::Error errorCode);
+
+public slots:
+private:
+    static QReadWriteLock lock;
+
+    QAndroidJniObject jBluetoothLe;
+    long javaToCtoken;
+
+};
+
+QT_END_NAMESPACE
+
+#endif // LOWENERGYNOTIFICATIONHUB_H
+