Android: Camera code clean-up

Change-Id: Ib400afde12067764c3dcc0f44e40ddc1abb3012f
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

4 files changed, 304 insertions, 334 deletions

diff --git a/src/plugins/android/jar/jar.pri b/src/plugins/android/jar/jar.pri
index d8bc59a72..d31839c61 100644
--- a/src/plugins/android/jar/jar.pri
+++ b/src/plugins/android/jar/jar.pri
@@ -6,7 +6,7 @@ API_VERSION = android-11
 JAVACLASSPATH += $$PWD/src
 
 JAVASOURCES += $$PWD/src/org/qtproject/qt5/android/multimedia/QtAndroidMediaPlayer.java \
-               $$PWD/src/org/qtproject/qt5/android/multimedia/QtCamera.java \
+               $$PWD/src/org/qtproject/qt5/android/multimedia/QtCameraListener.java \
                $$PWD/src/org/qtproject/qt5/android/multimedia/QtSurfaceTextureListener.java \
                $$PWD/src/org/qtproject/qt5/android/multimedia/QtSurfaceTextureHolder.java \
                $$PWD/src/org/qtproject/qt5/android/multimedia/QtMultimediaUtils.java \
diff --git a/src/plugins/android/jar/src/org/qtproject/qt5/android/multimedia/QtCamera.java b/src/plugins/android/jar/src/org/qtproject/qt5/android/multimedia/QtCameraListener.java
index f03053f17..27002fd29 100644
--- a/src/plugins/android/jar/src/org/qtproject/qt5/android/multimedia/QtCamera.java
+++ b/src/plugins/android/jar/src/org/qtproject/qt5/android/multimedia/QtCameraListener.java
@@ -48,148 +48,38 @@ import android.util.Log;
 import java.lang.Math;
 import java.util.concurrent.locks.ReentrantLock;
 
-public class QtCamera implements Camera.ShutterCallback,
-                                 Camera.PictureCallback,
-                                 Camera.AutoFocusCallback,
-                                 Camera.PreviewCallback
+public class QtCameraListener implements Camera.ShutterCallback,
+                                         Camera.PictureCallback,
+                                         Camera.AutoFocusCallback,
+                                         Camera.PreviewCallback
 {
     private int m_cameraId = -1;
-    private Camera m_camera = null;
-    private byte[] m_cameraPreviewFirstBuffer = null;
-    private byte[] m_cameraPreviewSecondBuffer = null;
-    private int m_actualPreviewBuffer = 0;
+    private byte[][] m_cameraPreviewBuffer = null;
+    private volatile int m_actualPreviewBuffer = 0;
     private final ReentrantLock m_buffersLock = new ReentrantLock();
-    private boolean m_isReleased = false;
     private boolean m_fetchEachFrame = false;
 
     private static final String TAG = "Qt Camera";
 
-    private QtCamera(int id, Camera cam)
+    private QtCameraListener(int id)
     {
         m_cameraId = id;
-        m_camera = cam;
     }
 
-    public static QtCamera open(int cameraId)
+    public void preparePreviewBuffer(Camera camera)
     {
-        try {
-            Camera cam = Camera.open(cameraId);
-            return new QtCamera(cameraId, cam);
-        } catch(Exception e) {
-            Log.d(TAG, e.getMessage());
-        }
-        return null;
-    }
-
-    public Camera.Parameters getParameters()
-    {
-        return m_camera.getParameters();
-    }
-
-    public void lock()
-    {
-        try {
-            m_camera.lock();
-        } catch(Exception e) {
-            Log.d(TAG, e.getMessage());
-        }
-    }
-
-    public void unlock()
-    {
-        try {
-            m_camera.unlock();
-        } catch(Exception e) {
-            Log.d(TAG, e.getMessage());
-        }
-    }
-
-    public void release()
-    {
-        m_isReleased = true;
-        m_camera.release();
-    }
-
-    public void reconnect()
-    {
-        try {
-            m_camera.reconnect();
-        } catch(Exception e) {
-            Log.d(TAG, e.getMessage());
-        }
-    }
-
-    public void setDisplayOrientation(int degrees)
-    {
-        m_camera.setDisplayOrientation(degrees);
-    }
-
-    public void setParameters(Camera.Parameters params)
-    {
-        try {
-            m_camera.setParameters(params);
-        } catch(Exception e) {
-            Log.d(TAG, e.getMessage());
-        }
-    }
-
-    public void setPreviewTexture(SurfaceTexture surfaceTexture)
-    {
-        try {
-            m_camera.setPreviewTexture(surfaceTexture);
-        } catch(Exception e) {
-            Log.d(TAG, e.getMessage());
-        }
-    }
-
-    public void fetchEachFrame(boolean fetch)
-    {
-        m_fetchEachFrame = fetch;
-    }
-
-    public void startPreview()
-    {
-        Camera.Size previewSize = m_camera.getParameters().getPreviewSize();
-        double bytesPerPixel = ImageFormat.getBitsPerPixel(m_camera.getParameters().getPreviewFormat()) / 8.0;
+        Camera.Size previewSize = camera.getParameters().getPreviewSize();
+        double bytesPerPixel = ImageFormat.getBitsPerPixel(camera.getParameters().getPreviewFormat()) / 8.0;
         int bufferSizeNeeded = (int)Math.ceil(bytesPerPixel*previewSize.width*previewSize.height);
-
-        //We need to clear preview buffers queue here, but there is no method to do it
-        //Though just resetting preview callback do the trick
-        m_camera.setPreviewCallback(null);
         m_buffersLock.lock();
-        if (m_cameraPreviewFirstBuffer == null || m_cameraPreviewFirstBuffer.length < bufferSizeNeeded)
-            m_cameraPreviewFirstBuffer = new byte[bufferSizeNeeded];
-        if (m_cameraPreviewSecondBuffer == null || m_cameraPreviewSecondBuffer.length < bufferSizeNeeded)
-            m_cameraPreviewSecondBuffer = new byte[bufferSizeNeeded];
-        addCallbackBuffer();
+        if (m_cameraPreviewBuffer == null || m_cameraPreviewBuffer[0].length < bufferSizeNeeded)
+            m_cameraPreviewBuffer = new byte[2][bufferSizeNeeded];
         m_buffersLock.unlock();
-        m_camera.setPreviewCallbackWithBuffer(this);
-
-        m_camera.startPreview();
     }
 
-    public void stopPreview()
-    {
-        m_camera.stopPreview();
-    }
-
-    public void autoFocus()
-    {
-        m_camera.autoFocus(this);
-    }
-
-    public void cancelAutoFocus()
-    {
-        m_camera.cancelAutoFocus();
-    }
-
-    public void takePicture()
+    public void fetchEachFrame(boolean fetch)
     {
-        try {
-            m_camera.takePicture(this, null, this);
-        } catch(Exception e) {
-            Log.d(TAG, e.getMessage());
-        }
+        m_fetchEachFrame = fetch;
     }
 
     public byte[] lockAndFetchPreviewBuffer()
@@ -199,10 +89,7 @@ public class QtCamera implements Camera.ShutterCallback,
         //We should reset actualBuffer flag here to make sure we will not use old preview with future captures
         byte[] result = null;
         m_buffersLock.lock();
-        if (m_actualPreviewBuffer == 1)
-            result = m_cameraPreviewFirstBuffer;
-        else if (m_actualPreviewBuffer == 2)
-            result = m_cameraPreviewSecondBuffer;
+        result = m_cameraPreviewBuffer[(m_actualPreviewBuffer == 1) ? 0 : 1];
         m_actualPreviewBuffer = 0;
         return result;
     }
@@ -213,14 +100,9 @@ public class QtCamera implements Camera.ShutterCallback,
             m_buffersLock.unlock();
     }
 
-    private void addCallbackBuffer()
+    public byte[] callbackBuffer()
     {
-        if (m_isReleased)
-            return;
-
-        m_camera.addCallbackBuffer((m_actualPreviewBuffer == 1)
-                                    ? m_cameraPreviewSecondBuffer
-                                    : m_cameraPreviewFirstBuffer);
+        return m_cameraPreviewBuffer[(m_actualPreviewBuffer == 1) ? 1 : 0];
     }
 
     @Override
@@ -243,13 +125,13 @@ public class QtCamera implements Camera.ShutterCallback,
         if (data != null && m_fetchEachFrame)
             notifyFrameFetched(m_cameraId, data);
 
-        if (data == m_cameraPreviewFirstBuffer)
+        if (data == m_cameraPreviewBuffer[0])
             m_actualPreviewBuffer = 1;
-        else if (data == m_cameraPreviewSecondBuffer)
+        else if (data == m_cameraPreviewBuffer[1])
             m_actualPreviewBuffer = 2;
         else
             m_actualPreviewBuffer = 0;
-        addCallbackBuffer();
+        camera.addCallbackBuffer(m_cameraPreviewBuffer[(m_actualPreviewBuffer == 1) ? 1 : 0]);
         m_buffersLock.unlock();
     }
 
diff --git a/src/plugins/android/src/wrappers/jcamera.cpp b/src/plugins/android/src/wrappers/jcamera.cpp
index f43e2308c..5401e6d1f 100644
--- a/src/plugins/android/src/wrappers/jcamera.cpp
+++ b/src/plugins/android/src/wrappers/jcamera.cpp
@@ -41,19 +41,19 @@
 
 #include "jcamera.h"
 
-#include <QtCore/private/qjni_p.h>
 #include <qstringlist.h>
 #include <qdebug.h>
 #include "qandroidmultimediautils.h"
-#include <qthread.h>
 #include <qmutex.h>
 #include <QtCore/private/qjnihelpers_p.h>
+#include <QtCore/qthread.h>
 
 QT_BEGIN_NAMESPACE
 
-static jclass g_qtCameraClass = 0;
-static QMap<int, JCamera*> g_objectMap;
-static QMutex g_objectMapMutex;
+static jclass g_qtCameraListenerClass = 0;
+static QMutex g_cameraMapMutex;
+typedef QMap<int, JCamera *> CameraMap;
+Q_GLOBAL_STATIC(CameraMap, g_cameraMap)
 
 static QRect areaToRect(jobject areaObj)
 {
@@ -79,31 +79,30 @@ static QJNIObjectPrivate rectToArea(const QRect &rect)
     return area;
 }
 
-// native method for QtCamera.java
+// native method for QtCameraLisener.java
 static void notifyAutoFocusComplete(JNIEnv* , jobject, int id, jboolean success)
 {
-    QMutexLocker locker(&g_objectMapMutex);
-    JCamera *obj = g_objectMap.value(id, 0);
+    QMutexLocker locker(&g_cameraMapMutex);
+    JCamera *obj = g_cameraMap->value(id, 0);
     if (obj)
         Q_EMIT obj->autoFocusComplete(success);
 }
 
 static void notifyPictureExposed(JNIEnv* , jobject, int id)
 {
-    QMutexLocker locker(&g_objectMapMutex);
-    JCamera *obj = g_objectMap.value(id, 0);
+    QMutexLocker locker(&g_cameraMapMutex);
+    JCamera *obj = g_cameraMap->value(id, 0);
     if (obj)
         Q_EMIT obj->pictureExposed();
 }
 
 static void notifyPictureCaptured(JNIEnv *env, jobject, int id, jbyteArray data)
 {
-    QMutexLocker locker(&g_objectMapMutex);
-    JCamera *obj = g_objectMap.value(id, 0);
+    QMutexLocker locker(&g_cameraMapMutex);
+    JCamera *obj = g_cameraMap->value(id, 0);
     if (obj) {
-        QByteArray bytes;
-        int arrayLength = env->GetArrayLength(data);
-        bytes.resize(arrayLength);
+        const int arrayLength = env->GetArrayLength(data);
+        QByteArray bytes(arrayLength, Qt::Uninitialized);
         env->GetByteArrayRegion(data, 0, arrayLength, (jbyte*)bytes.data());
         Q_EMIT obj->pictureCaptured(bytes);
     }
@@ -111,46 +110,30 @@ static void notifyPictureCaptured(JNIEnv *env, jobject, int id, jbyteArray data)
 
 static void notifyFrameFetched(JNIEnv *env, jobject, int id, jbyteArray data)
 {
-    QMutexLocker locker(&g_objectMapMutex);
-    JCamera *obj = g_objectMap.value(id, 0);
+    QMutexLocker locker(&g_cameraMapMutex);
+    JCamera *obj = g_cameraMap->value(id, 0);
     if (obj) {
-        QByteArray bytes;
-        int arrayLength = env->GetArrayLength(data);
-        bytes.resize(arrayLength);
+        const int arrayLength = env->GetArrayLength(data);
+        QByteArray bytes(arrayLength, Qt::Uninitialized);
         env->GetByteArrayRegion(data, 0, arrayLength, (jbyte*)bytes.data());
 
         Q_EMIT obj->frameFetched(bytes);
     }
 }
 
-class JCameraInstantiator : public QObject
+class JCameraPrivate : public QObject
 {
     Q_OBJECT
 public:
-    JCameraInstantiator() : QObject(0) {}
-    QJNIObjectPrivate result() {return lastCamera;}
-public slots:
-    void openCamera(int cameraId)
-    {
-        QJNIEnvironmentPrivate env;
-        lastCamera = QJNIObjectPrivate::callStaticObjectMethod(g_qtCameraClass,
-                                                               "open",
-                                                               "(I)Lorg/qtproject/qt5/android/multimedia/QtCamera;",
-                                                               cameraId);
-    }
-private:
-    QJNIObjectPrivate lastCamera;
-};
+    JCameraPrivate();
+    ~JCameraPrivate();
 
-class JCameraWorker : public QObject
-{
-    Q_OBJECT
-    friend class JCamera;
-
-    JCameraWorker(JCamera *camera, int cameraId, jobject cam, QThread *workerThread);
-    ~JCameraWorker();
+    Q_INVOKABLE bool init(int cameraId);
 
     Q_INVOKABLE void release();
+    Q_INVOKABLE void lock();
+    Q_INVOKABLE void unlock();
+    Q_INVOKABLE void reconnect();
 
     Q_INVOKABLE JCamera::CameraFacing getFacing();
     Q_INVOKABLE int getNativeOrientation();
@@ -182,6 +165,7 @@ class JCameraWorker : public QObject
     Q_INVOKABLE void setFocusAreas(const QList<QRect> &areas);
 
     Q_INVOKABLE void autoFocus();
+    Q_INVOKABLE void cancelAutoFocus();
 
     Q_INVOKABLE bool isAutoExposureLockSupported();
     Q_INVOKABLE bool getAutoExposureLock();
@@ -212,26 +196,23 @@ class JCameraWorker : public QObject
     Q_INVOKABLE void startPreview();
     Q_INVOKABLE void stopPreview();
 
+    Q_INVOKABLE void takePicture();
+
     Q_INVOKABLE void fetchEachFrame(bool fetch);
     Q_INVOKABLE void fetchLastPreviewFrame();
 
     Q_INVOKABLE void applyParameters();
 
     Q_INVOKABLE QStringList callParametersStringListMethod(const QByteArray &methodName);
-    Q_INVOKABLE void callVoidMethod(const QByteArray &methodName);
 
     int m_cameraId;
-    QJNIObjectPrivate m_info;
-    QJNIObjectPrivate m_parameters;
-
+    QMutex m_parametersMutex;
     QSize m_previewSize;
     int m_rotation;
-
-    JCamera *q;
-
-    QThread *m_workerThread;
-    QMutex m_parametersMutex;
+    QJNIObjectPrivate m_info;
+    QJNIObjectPrivate m_parameters;
     QJNIObjectPrivate m_camera;
+    QJNIObjectPrivate m_cameraListener;
 
 Q_SIGNALS:
     void previewSizeChanged();
@@ -245,122 +226,137 @@ Q_SIGNALS:
     void previewFetched(const QByteArray &preview);
 };
 
+JCamera::JCamera(JCameraPrivate *d, QThread *worker)
+    : QObject(),
+      d_ptr(d),
+      m_worker(worker)
 
-
-JCamera::JCamera(int cameraId, jobject cam, QThread *workerThread)
-    : QObject()
 {
     qRegisterMetaType<QList<int> >();
     qRegisterMetaType<QList<QSize> >();
     qRegisterMetaType<QList<QRect> >();
 
-    d = new JCameraWorker(this, cameraId, cam, workerThread);
-    connect(d, &JCameraWorker::previewSizeChanged, this, &JCamera::previewSizeChanged);
-    connect(d, &JCameraWorker::previewStarted, this, &JCamera::previewStarted);
-    connect(d, &JCameraWorker::previewStopped, this, &JCamera::previewStopped);
-    connect(d, &JCameraWorker::autoFocusStarted, this, &JCamera::autoFocusStarted);
-    connect(d, &JCameraWorker::whiteBalanceChanged, this, &JCamera::whiteBalanceChanged);
-    connect(d, &JCameraWorker::previewFetched, this, &JCamera::previewFetched);
+    connect(d, &JCameraPrivate::previewSizeChanged, this, &JCamera::previewSizeChanged);
+    connect(d, &JCameraPrivate::previewStarted, this, &JCamera::previewStarted);
+    connect(d, &JCameraPrivate::previewStopped, this, &JCamera::previewStopped);
+    connect(d, &JCameraPrivate::autoFocusStarted, this, &JCamera::autoFocusStarted);
+    connect(d, &JCameraPrivate::whiteBalanceChanged, this, &JCamera::whiteBalanceChanged);
+    connect(d, &JCameraPrivate::previewFetched, this, &JCamera::previewFetched);
 }
 
 JCamera::~JCamera()
 {
+    Q_D(JCamera);
     if (d->m_camera.isValid()) {
-        g_objectMapMutex.lock();
-        g_objectMap.remove(d->m_cameraId);
-        g_objectMapMutex.unlock();
+        g_cameraMapMutex.lock();
+        g_cameraMap->remove(d->m_cameraId);
+        g_cameraMapMutex.unlock();
     }
-    d->deleteLater();
+
+    release();
+    m_worker->exit();
+    m_worker->wait(5000);
 }
 
 JCamera *JCamera::open(int cameraId)
 {
-    QThread *cameraThread = new QThread;
-    connect(cameraThread, &QThread::finished, cameraThread, &QThread::deleteLater);
-    cameraThread->start();
-    JCameraInstantiator *instantiator = new JCameraInstantiator;
-    instantiator->moveToThread(cameraThread);
-    QMetaObject::invokeMethod(instantiator, "openCamera",
-                              Qt::BlockingQueuedConnection,
-                              Q_ARG(int, cameraId));
-    QJNIObjectPrivate camera = instantiator->result();
-    delete instantiator;
-
-    if (!camera.isValid()) {
-        cameraThread->terminate();
-        delete cameraThread;
+    JCameraPrivate *d = new JCameraPrivate();
+    QThread *worker = new QThread;
+    worker->start();
+    d->moveToThread(worker);
+    connect(worker, &QThread::finished, d, &JCameraPrivate::deleteLater);
+    bool ok = false;
+    QMetaObject::invokeMethod(d, "init", Qt::BlockingQueuedConnection, Q_RETURN_ARG(bool, ok), Q_ARG(int, cameraId));
+    if (!ok) {
+        worker->quit();
+        worker->wait(5000);
+        delete d;
+        delete worker;
         return 0;
-    } else {
-        return new JCamera(cameraId, camera.object(), cameraThread);
     }
+
+    JCamera *q = new JCamera(d, worker);
+    g_cameraMapMutex.lock();
+    g_cameraMap->insert(cameraId, q);
+    g_cameraMapMutex.unlock();
+    return q;
 }
 
 int JCamera::cameraId() const
 {
+    Q_D(const JCamera);
     return d->m_cameraId;
 }
 
 void JCamera::lock()
 {
-    QMetaObject::invokeMethod(d, "callVoidMethod",
-                              Qt::BlockingQueuedConnection,
-                              Q_ARG(QByteArray, "lock"));
+    Q_D(JCamera);
+    QMetaObject::invokeMethod(d, "lock", Qt::BlockingQueuedConnection);
 }
 
 void JCamera::unlock()
 {
-    QMetaObject::invokeMethod(d, "callVoidMethod",
-                              Qt::BlockingQueuedConnection,
-                              Q_ARG(QByteArray, "unlock"));
+    Q_D(JCamera);
+    QMetaObject::invokeMethod(d, "unlock", Qt::BlockingQueuedConnection);
 }
 
 void JCamera::reconnect()
 {
-    QMetaObject::invokeMethod(d, "callVoidMethod", Q_ARG(QByteArray, "reconnect"));
+    Q_D(JCamera);
+    QMetaObject::invokeMethod(d, "reconnect");
 }
 
 void JCamera::release()
 {
-    QMetaObject::invokeMethod(d, "release");
+    Q_D(JCamera);
+    QMetaObject::invokeMethod(d, "release", Qt::BlockingQueuedConnection);
 }
 
 JCamera::CameraFacing JCamera::getFacing()
 {
+    Q_D(JCamera);
     return d->getFacing();
 }
 
 int JCamera::getNativeOrientation()
 {
+    Q_D(JCamera);
     return d->getNativeOrientation();
 }
 
 QSize JCamera::getPreferredPreviewSizeForVideo()
 {
+    Q_D(JCamera);
     return d->getPreferredPreviewSizeForVideo();
 }
 
 QList<QSize> JCamera::getSupportedPreviewSizes()
 {
+    Q_D(JCamera);
     return d->getSupportedPreviewSizes();
 }
 
 JCamera::ImageFormat JCamera::getPreviewFormat()
 {
+    Q_D(JCamera);
     return d->getPreviewFormat();
 }
 
 void JCamera::setPreviewFormat(ImageFormat fmt)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setPreviewFormat", Q_ARG(JCamera::ImageFormat, fmt));
 }
 
 QSize JCamera::previewSize() const
 {
+    Q_D(const JCamera);
     return d->m_previewSize;
 }
 
 void JCamera::setPreviewSize(const QSize &size)
 {
+    Q_D(JCamera);
     d->m_parametersMutex.lock();
     bool areParametersValid = d->m_parameters.isValid();
     d->m_parametersMutex.unlock();
@@ -373,176 +369,211 @@ void JCamera::setPreviewSize(const QSize &size)
 
 void JCamera::setPreviewTexture(jobject surfaceTexture)
 {
-    QMetaObject::invokeMethod(d, "setPreviewTexture", Q_ARG(void *, surfaceTexture));
+    Q_D(JCamera);
+    QMetaObject::invokeMethod(d, "setPreviewTexture", Qt::BlockingQueuedConnection, Q_ARG(void *, surfaceTexture));
 }
 
 bool JCamera::isZoomSupported()
 {
+    Q_D(JCamera);
     return d->isZoomSupported();
 }
 
 int JCamera::getMaxZoom()
 {
+    Q_D(JCamera);
     return d->getMaxZoom();
 }
 
 QList<int> JCamera::getZoomRatios()
 {
+    Q_D(JCamera);
     return d->getZoomRatios();
 }
 
 int JCamera::getZoom()
 {
+    Q_D(JCamera);
     return d->getZoom();
 }
 
 void JCamera::setZoom(int value)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setZoom", Q_ARG(int, value));
 }
 
 QStringList JCamera::getSupportedFlashModes()
 {
+    Q_D(JCamera);
     return d->callParametersStringListMethod("getSupportedFlashModes");
 }
 
 QString JCamera::getFlashMode()
 {
+    Q_D(JCamera);
     return d->getFlashMode();
 }
 
 void JCamera::setFlashMode(const QString &value)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setFlashMode", Q_ARG(QString, value));
 }
 
 QStringList JCamera::getSupportedFocusModes()
 {
+    Q_D(JCamera);
     return d->callParametersStringListMethod("getSupportedFocusModes");
 }
 
 QString JCamera::getFocusMode()
 {
+    Q_D(JCamera);
     return d->getFocusMode();
 }
 
 void JCamera::setFocusMode(const QString &value)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setFocusMode", Q_ARG(QString, value));
 }
 
 int JCamera::getMaxNumFocusAreas()
 {
+    Q_D(JCamera);
     return d->getMaxNumFocusAreas();
 }
 
 QList<QRect> JCamera::getFocusAreas()
 {
+    Q_D(JCamera);
     return d->getFocusAreas();
 }
 
 void JCamera::setFocusAreas(const QList<QRect> &areas)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setFocusAreas", Q_ARG(QList<QRect>, areas));
 }
 
 void JCamera::autoFocus()
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "autoFocus");
 }
 
 void JCamera::cancelAutoFocus()
 {
-    QMetaObject::invokeMethod(d, "callVoidMethod", Q_ARG(QByteArray, "cancelAutoFocus"));
+    Q_D(JCamera);
+    QMetaObject::invokeMethod(d, "cancelAutoFocus", Qt::QueuedConnection);
 }
 
 bool JCamera::isAutoExposureLockSupported()
 {
+    Q_D(JCamera);
     return d->isAutoExposureLockSupported();
 }
 
 bool JCamera::getAutoExposureLock()
 {
+    Q_D(JCamera);
     return d->getAutoExposureLock();
 }
 
 void JCamera::setAutoExposureLock(bool toggle)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setAutoExposureLock", Q_ARG(bool, toggle));
 }
 
 bool JCamera::isAutoWhiteBalanceLockSupported()
 {
+    Q_D(JCamera);
     return d->isAutoWhiteBalanceLockSupported();
 }
 
 bool JCamera::getAutoWhiteBalanceLock()
 {
+    Q_D(JCamera);
     return d->getAutoWhiteBalanceLock();
 }
 
 void JCamera::setAutoWhiteBalanceLock(bool toggle)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setAutoWhiteBalanceLock", Q_ARG(bool, toggle));
 }
 
 int JCamera::getExposureCompensation()
 {
+    Q_D(JCamera);
     return d->getExposureCompensation();
 }
 
 void JCamera::setExposureCompensation(int value)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setExposureCompensation", Q_ARG(int, value));
 }
 
 float JCamera::getExposureCompensationStep()
 {
+    Q_D(JCamera);
     return d->getExposureCompensationStep();
 }
 
 int JCamera::getMinExposureCompensation()
 {
+    Q_D(JCamera);
     return d->getMinExposureCompensation();
 }
 
 int JCamera::getMaxExposureCompensation()
 {
+    Q_D(JCamera);
     return d->getMaxExposureCompensation();
 }
 
 QStringList JCamera::getSupportedSceneModes()
 {
+    Q_D(JCamera);
     return d->callParametersStringListMethod("getSupportedSceneModes");
 }
 
 QString JCamera::getSceneMode()
 {
+    Q_D(JCamera);
     return d->getSceneMode();
 }
 
 void JCamera::setSceneMode(const QString &value)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setSceneMode", Q_ARG(QString, value));
 }
 
 QStringList JCamera::getSupportedWhiteBalance()
 {
+    Q_D(JCamera);
     return d->callParametersStringListMethod("getSupportedWhiteBalance");
 }
 
 QString JCamera::getWhiteBalance()
 {
+    Q_D(JCamera);
     return d->getWhiteBalance();
 }
 
 void JCamera::setWhiteBalance(const QString &value)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setWhiteBalance", Q_ARG(QString, value));
 }
 
 void JCamera::setRotation(int rotation)
 {
+    Q_D(JCamera);
     //We need to do it here and not in worker class because we cache rotation
     d->m_parametersMutex.lock();
     bool areParametersValid = d->m_parameters.isValid();
@@ -556,110 +587,143 @@ void JCamera::setRotation(int rotation)
 
 int JCamera::getRotation() const
 {
+    Q_D(const JCamera);
     return d->m_rotation;
 }
 
 QList<QSize> JCamera::getSupportedPictureSizes()
 {
+    Q_D(JCamera);
     return d->getSupportedPictureSizes();
 }
 
 void JCamera::setPictureSize(const QSize &size)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setPictureSize", Q_ARG(QSize, size));
 }
 
 void JCamera::setJpegQuality(int quality)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "setJpegQuality", Q_ARG(int, quality));
 }
 
 void JCamera::takePicture()
 {
-    QMetaObject::invokeMethod(d, "callVoidMethod", Q_ARG(QByteArray, "takePicture"));
+    Q_D(JCamera);
+    QMetaObject::invokeMethod(d, "takePicture", Qt::BlockingQueuedConnection);
 }
 
 void JCamera::fetchEachFrame(bool fetch)
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "fetchEachFrame", Q_ARG(bool, fetch));
 }
 
 void JCamera::fetchLastPreviewFrame()
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "fetchLastPreviewFrame");
 }
 
 QJNIObjectPrivate JCamera::getCameraObject()
 {
-    return d->m_camera.getObjectField("m_camera", "Landroid/hardware/Camera;");
+    Q_D(JCamera);
+    return d->m_camera;
 }
 
 void JCamera::startPreview()
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "startPreview");
 }
 
 void JCamera::stopPreview()
 {
+    Q_D(JCamera);
     QMetaObject::invokeMethod(d, "stopPreview");
 }
 
+JCameraPrivate::JCameraPrivate()
+    : QObject(),
+      m_parametersMutex(QMutex::Recursive)
+{
+}
 
-//JCameraWorker
+JCameraPrivate::~JCameraPrivate()
+{
+}
 
-JCameraWorker::JCameraWorker(JCamera *camera, int cameraId, jobject cam, QThread *workerThread)
-    : QObject(0)
-    , m_cameraId(cameraId)
-    , m_rotation(0)
-    , m_parametersMutex(QMutex::Recursive)
-    , m_camera(cam)
+bool JCameraPrivate::init(int cameraId)
 {
-    q = camera;
-    m_workerThread = workerThread;
-    moveToThread(m_workerThread);
+    m_cameraId = cameraId;
+    m_camera = QJNIObjectPrivate::callStaticObjectMethod("android/hardware/Camera",
+                                                         "open",
+                                                         "(I)Landroid/hardware/Camera;",
+                                                         cameraId);
 
-    if (m_camera.isValid()) {
-        g_objectMapMutex.lock();
-        g_objectMap.insert(cameraId, q);
-        g_objectMapMutex.unlock();
+    if (!m_camera.isValid())
+        return false;
 
-        m_info = QJNIObjectPrivate("android/hardware/Camera$CameraInfo");
-        m_camera.callStaticMethod<void>("android/hardware/Camera",
-                                        "getCameraInfo",
-                                        "(ILandroid/hardware/Camera$CameraInfo;)V",
-                                        cameraId, m_info.object());
+    m_cameraListener = QJNIObjectPrivate(g_qtCameraListenerClass, "(I)V", m_cameraId);
+    m_info = QJNIObjectPrivate("android/hardware/Camera$CameraInfo");
+    m_camera.callStaticMethod<void>("android/hardware/Camera",
+                                    "getCameraInfo",
+                                    "(ILandroid/hardware/Camera$CameraInfo;)V",
+                                    cameraId,
+                                    m_info.object());
 
-        QJNIObjectPrivate params = m_camera.callObjectMethod("getParameters",
-                                                             "()Landroid/hardware/Camera$Parameters;");
-        m_parameters = QJNIObjectPrivate(params);
-    }
-}
+    QJNIObjectPrivate params = m_camera.callObjectMethod("getParameters",
+                                                         "()Landroid/hardware/Camera$Parameters;");
+    m_parameters = QJNIObjectPrivate(params);
 
-JCameraWorker::~JCameraWorker()
-{
-    m_workerThread->quit();
+    return true;
 }
 
-void JCameraWorker::release()
+void JCameraPrivate::release()
 {
     m_previewSize = QSize();
     m_parametersMutex.lock();
     m_parameters = QJNIObjectPrivate();
     m_parametersMutex.unlock();
-    m_camera.callMethod<void>("release");
+    if (m_camera.isValid())
+        m_camera.callMethod<void>("release");
+}
+
+void JCameraPrivate::lock()
+{
+    m_camera.callMethod<void>("lock");
+}
+
+void JCameraPrivate::unlock()
+{
+    m_camera.callMethod<void>("unlock");
+}
+
+void JCameraPrivate::reconnect()
+{
+    QJNIEnvironmentPrivate env;
+    m_camera.callMethod<void>("reconnect");
+    if (env->ExceptionCheck()) {
+#ifdef QT_DEBUG
+        env->ExceptionDescribe();
+#endif // QT_DEBUG
+        env->ExceptionDescribe();
+    }
 }
 
-JCamera::CameraFacing JCameraWorker::getFacing()
+JCamera::CameraFacing JCameraPrivate::getFacing()
 {
     return JCamera::CameraFacing(m_info.getField<jint>("facing"));
 }
 
-int JCameraWorker::getNativeOrientation()
+int JCameraPrivate::getNativeOrientation()
 {
     return m_info.getField<jint>("orientation");
 }
 
-QSize JCameraWorker::getPreferredPreviewSizeForVideo()
+QSize JCameraPrivate::getPreferredPreviewSizeForVideo()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -672,7 +736,7 @@ QSize JCameraWorker::getPreferredPreviewSizeForVideo()
     return QSize(size.getField<jint>("width"), size.getField<jint>("height"));
 }
 
-QList<QSize> JCameraWorker::getSupportedPreviewSizes()
+QList<QSize> JCameraPrivate::getSupportedPreviewSizes()
 {
     QList<QSize> list;
 
@@ -695,7 +759,7 @@ QList<QSize> JCameraWorker::getSupportedPreviewSizes()
     return list;
 }
 
-JCamera::ImageFormat JCameraWorker::getPreviewFormat()
+JCamera::ImageFormat JCameraPrivate::getPreviewFormat()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -705,7 +769,7 @@ JCamera::ImageFormat JCameraWorker::getPreviewFormat()
     return JCamera::ImageFormat(m_parameters.callMethod<jint>("getPreviewFormat"));
 }
 
-void JCameraWorker::setPreviewFormat(JCamera::ImageFormat fmt)
+void JCameraPrivate::setPreviewFormat(JCamera::ImageFormat fmt)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -716,7 +780,7 @@ void JCameraWorker::setPreviewFormat(JCamera::ImageFormat fmt)
     applyParameters();
 }
 
-void JCameraWorker::updatePreviewSize()
+void JCameraPrivate::updatePreviewSize()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -728,14 +792,14 @@ void JCameraWorker::updatePreviewSize()
     emit previewSizeChanged();
 }
 
-void JCameraWorker::setPreviewTexture(void *surfaceTexture)
+void JCameraPrivate::setPreviewTexture(void *surfaceTexture)
 {
     m_camera.callMethod<void>("setPreviewTexture",
                               "(Landroid/graphics/SurfaceTexture;)V",
                               static_cast<jobject>(surfaceTexture));
 }
 
-bool JCameraWorker::isZoomSupported()
+bool JCameraPrivate::isZoomSupported()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -745,7 +809,7 @@ bool JCameraWorker::isZoomSupported()
     return m_parameters.callMethod<jboolean>("isZoomSupported");
 }
 
-int JCameraWorker::getMaxZoom()
+int JCameraPrivate::getMaxZoom()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -755,7 +819,7 @@ int JCameraWorker::getMaxZoom()
     return m_parameters.callMethod<jint>("getMaxZoom");
 }
 
-QList<int> JCameraWorker::getZoomRatios()
+QList<int> JCameraPrivate::getZoomRatios()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -777,7 +841,7 @@ QList<int> JCameraWorker::getZoomRatios()
     return ratios;
 }
 
-int JCameraWorker::getZoom()
+int JCameraPrivate::getZoom()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -787,7 +851,7 @@ int JCameraWorker::getZoom()
     return m_parameters.callMethod<jint>("getZoom");
 }
 
-void JCameraWorker::setZoom(int value)
+void JCameraPrivate::setZoom(int value)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -798,7 +862,7 @@ void JCameraWorker::setZoom(int value)
     applyParameters();
 }
 
-QString JCameraWorker::getFlashMode()
+QString JCameraPrivate::getFlashMode()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -814,7 +878,7 @@ QString JCameraWorker::getFlashMode()
     return value;
 }
 
-void JCameraWorker::setFlashMode(const QString &value)
+void JCameraPrivate::setFlashMode(const QString &value)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -827,7 +891,7 @@ void JCameraWorker::setFlashMode(const QString &value)
     applyParameters();
 }
 
-QString JCameraWorker::getFocusMode()
+QString JCameraPrivate::getFocusMode()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -843,7 +907,7 @@ QString JCameraWorker::getFocusMode()
     return value;
 }
 
-void JCameraWorker::setFocusMode(const QString &value)
+void JCameraPrivate::setFocusMode(const QString &value)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -856,7 +920,7 @@ void JCameraWorker::setFocusMode(const QString &value)
     applyParameters();
 }
 
-int JCameraWorker::getMaxNumFocusAreas()
+int JCameraPrivate::getMaxNumFocusAreas()
 {
     if (QtAndroidPrivate::androidSdkVersion() < 14)
         return 0;
@@ -869,7 +933,7 @@ int JCameraWorker::getMaxNumFocusAreas()
     return m_parameters.callMethod<jint>("getMaxNumFocusAreas");
 }
 
-QList<QRect> JCameraWorker::getFocusAreas()
+QList<QRect> JCameraPrivate::getFocusAreas()
 {
     QList<QRect> areas;
 
@@ -897,7 +961,7 @@ QList<QRect> JCameraWorker::getFocusAreas()
     return areas;
 }
 
-void JCameraWorker::setFocusAreas(const QList<QRect> &areas)
+void JCameraPrivate::setFocusAreas(const QList<QRect> &areas)
 {
     if (QtAndroidPrivate::androidSdkVersion() < 14)
         return;
@@ -927,13 +991,20 @@ void JCameraWorker::setFocusAreas(const QList<QRect> &areas)
     applyParameters();
 }
 
-void JCameraWorker::autoFocus()
+void JCameraPrivate::autoFocus()
 {
-    m_camera.callMethod<void>("autoFocus");
+    m_camera.callMethod<void>("autoFocus",
+                              "(Landroid/hardware/Camera$AutoFocusCallback;)V",
+                              m_cameraListener.object());
     emit autoFocusStarted();
 }
 
-bool JCameraWorker::isAutoExposureLockSupported()
+void JCameraPrivate::cancelAutoFocus()
+{
+    m_camera.callMethod<void>("cancelAutoFocus");
+}
+
+bool JCameraPrivate::isAutoExposureLockSupported()
 {
     if (QtAndroidPrivate::androidSdkVersion() < 14)
         return false;
@@ -946,7 +1017,7 @@ bool JCameraWorker::isAutoExposureLockSupported()
     return m_parameters.callMethod<jboolean>("isAutoExposureLockSupported");
 }
 
-bool JCameraWorker::getAutoExposureLock()
+bool JCameraPrivate::getAutoExposureLock()
 {
     if (QtAndroidPrivate::androidSdkVersion() < 14)
         return false;
@@ -959,7 +1030,7 @@ bool JCameraWorker::getAutoExposureLock()
     return m_parameters.callMethod<jboolean>("getAutoExposureLock");
 }
 
-void JCameraWorker::setAutoExposureLock(bool toggle)
+void JCameraPrivate::setAutoExposureLock(bool toggle)
 {
     if (QtAndroidPrivate::androidSdkVersion() < 14)
         return;
@@ -973,7 +1044,7 @@ void JCameraWorker::setAutoExposureLock(bool toggle)
     applyParameters();
 }
 
-bool JCameraWorker::isAutoWhiteBalanceLockSupported()
+bool JCameraPrivate::isAutoWhiteBalanceLockSupported()
 {
     if (QtAndroidPrivate::androidSdkVersion() < 14)
         return false;
@@ -986,7 +1057,7 @@ bool JCameraWorker::isAutoWhiteBalanceLockSupported()
     return m_parameters.callMethod<jboolean>("isAutoWhiteBalanceLockSupported");
 }
 
-bool JCameraWorker::getAutoWhiteBalanceLock()
+bool JCameraPrivate::getAutoWhiteBalanceLock()
 {
     if (QtAndroidPrivate::androidSdkVersion() < 14)
         return false;
@@ -999,7 +1070,7 @@ bool JCameraWorker::getAutoWhiteBalanceLock()
     return m_parameters.callMethod<jboolean>("getAutoWhiteBalanceLock");
 }
 
-void JCameraWorker::setAutoWhiteBalanceLock(bool toggle)
+void JCameraPrivate::setAutoWhiteBalanceLock(bool toggle)
 {
     if (QtAndroidPrivate::androidSdkVersion() < 14)
         return;
@@ -1013,7 +1084,7 @@ void JCameraWorker::setAutoWhiteBalanceLock(bool toggle)
     applyParameters();
 }
 
-int JCameraWorker::getExposureCompensation()
+int JCameraPrivate::getExposureCompensation()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1023,7 +1094,7 @@ int JCameraWorker::getExposureCompensation()
     return m_parameters.callMethod<jint>("getExposureCompensation");
 }
 
-void JCameraWorker::setExposureCompensation(int value)
+void JCameraPrivate::setExposureCompensation(int value)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1034,7 +1105,7 @@ void JCameraWorker::setExposureCompensation(int value)
     applyParameters();
 }
 
-float JCameraWorker::getExposureCompensationStep()
+float JCameraPrivate::getExposureCompensationStep()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1044,7 +1115,7 @@ float JCameraWorker::getExposureCompensationStep()
     return m_parameters.callMethod<jfloat>("getExposureCompensationStep");
 }
 
-int JCameraWorker::getMinExposureCompensation()
+int JCameraPrivate::getMinExposureCompensation()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1054,7 +1125,7 @@ int JCameraWorker::getMinExposureCompensation()
     return m_parameters.callMethod<jint>("getMinExposureCompensation");
 }
 
-int JCameraWorker::getMaxExposureCompensation()
+int JCameraPrivate::getMaxExposureCompensation()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1064,7 +1135,7 @@ int JCameraWorker::getMaxExposureCompensation()
     return m_parameters.callMethod<jint>("getMaxExposureCompensation");
 }
 
-QString JCameraWorker::getSceneMode()
+QString JCameraPrivate::getSceneMode()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1080,7 +1151,7 @@ QString JCameraWorker::getSceneMode()
     return value;
 }
 
-void JCameraWorker::setSceneMode(const QString &value)
+void JCameraPrivate::setSceneMode(const QString &value)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1093,7 +1164,7 @@ void JCameraWorker::setSceneMode(const QString &value)
     applyParameters();
 }
 
-QString JCameraWorker::getWhiteBalance()
+QString JCameraPrivate::getWhiteBalance()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1109,7 +1180,7 @@ QString JCameraWorker::getWhiteBalance()
     return value;
 }
 
-void JCameraWorker::setWhiteBalance(const QString &value)
+void JCameraPrivate::setWhiteBalance(const QString &value)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1124,7 +1195,7 @@ void JCameraWorker::setWhiteBalance(const QString &value)
     emit whiteBalanceChanged();
 }
 
-void JCameraWorker::updateRotation()
+void JCameraPrivate::updateRotation()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1132,7 +1203,7 @@ void JCameraWorker::updateRotation()
     applyParameters();
 }
 
-QList<QSize> JCameraWorker::getSupportedPictureSizes()
+QList<QSize> JCameraPrivate::getSupportedPictureSizes()
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1155,7 +1226,7 @@ QList<QSize> JCameraWorker::getSupportedPictureSizes()
     return list;
 }
 
-void JCameraWorker::setPictureSize(const QSize &size)
+void JCameraPrivate::setPictureSize(const QSize &size)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1166,7 +1237,7 @@ void JCameraWorker::setPictureSize(const QSize &size)
     applyParameters();
 }
 
-void JCameraWorker::setJpegQuality(int quality)
+void JCameraPrivate::setJpegQuality(int quality)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1177,49 +1248,71 @@ void JCameraWorker::setJpegQuality(int quality)
     applyParameters();
 }
 
-void JCameraWorker::startPreview()
-{
-    callVoidMethod("startPreview");
+void JCameraPrivate::startPreview()
+{
+    //We need to clear preview buffers queue here, but there is no method to do it
+    //Though just resetting preview callback do the trick
+    m_camera.callMethod<void>("setPreviewCallbackWithBuffer",
+                              "(Landroid/hardware/Camera$PreviewCallback;)V",
+                              jobject(0));
+    m_cameraListener.callMethod<void>("preparePreviewBuffer", "(Landroid/hardware/Camera;)V", m_camera.object());
+    QJNIObjectPrivate buffer = m_cameraListener.callObjectMethod<jbyteArray>("callbackBuffer");
+    m_camera.callMethod<void>("addCallbackBuffer", "([B)V", buffer.object());
+    m_camera.callMethod<void>("setPreviewCallbackWithBuffer",
+                              "(Landroid/hardware/Camera$PreviewCallback;)V",
+                              m_cameraListener.object());
+    m_camera.callMethod<void>("startPreview");
     emit previewStarted();
 }
 
-void JCameraWorker::stopPreview()
+void JCameraPrivate::stopPreview()
 {
-    callVoidMethod("stopPreview");
+    m_camera.callMethod<void>("stopPreview");
     emit previewStopped();
 }
 
-void JCameraWorker::fetchEachFrame(bool fetch)
+void JCameraPrivate::takePicture()
+{
+    m_camera.callMethod<void>("takePicture", "(Landroid/hardware/Camera$ShutterCallback;"
+                                             "Landroid/hardware/Camera$PictureCallback;"
+                                             "Landroid/hardware/Camera$PictureCallback;)V",
+                                              m_cameraListener.object(),
+                                              jobject(0),
+                                              m_cameraListener.object());
+}
+
+void JCameraPrivate::fetchEachFrame(bool fetch)
 {
-    m_camera.callMethod<void>("fetchEachFrame", "(Z)V", fetch);
+    m_cameraListener.callMethod<void>("fetchEachFrame", "(Z)V", fetch);
 }
 
-void JCameraWorker::fetchLastPreviewFrame()
+void JCameraPrivate::fetchLastPreviewFrame()
 {
     QJNIEnvironmentPrivate env;
-    QJNIObjectPrivate dataObj = m_camera.callObjectMethod("lockAndFetchPreviewBuffer", "()[B");
-    if (!dataObj.object()) {
-        m_camera.callMethod<void>("unlockPreviewBuffer");
+    QJNIObjectPrivate data = m_cameraListener.callObjectMethod("lockAndFetchPreviewBuffer", "()[B");
+    if (!data.isValid()) {
+        m_cameraListener.callMethod<void>("unlockPreviewBuffer");
         return;
     }
-    jbyteArray data = static_cast<jbyteArray>(dataObj.object());
-    QByteArray bytes;
-    int arrayLength = env->GetArrayLength(data);
-    bytes.resize(arrayLength);
-    env->GetByteArrayRegion(data, 0, arrayLength, (jbyte*)bytes.data());
-    m_camera.callMethod<void>("unlockPreviewBuffer");
+    const int arrayLength = env->GetArrayLength(static_cast<jbyteArray>(data.object()));
+    QByteArray bytes(arrayLength, Qt::Uninitialized);
+    env->GetByteArrayRegion(static_cast<jbyteArray>(data.object()),
+                            0,
+                            arrayLength,
+                            reinterpret_cast<jbyte *>(bytes.data()));
+    m_cameraListener.callMethod<void>("unlockPreviewBuffer");
 
     emit previewFetched(bytes);
 }
 
-void JCameraWorker::applyParameters()
+void JCameraPrivate::applyParameters()
 {
     m_camera.callMethod<void>("setParameters",
                               "(Landroid/hardware/Camera$Parameters;)V",
                               m_parameters.object());
 }
 
-QStringList JCameraWorker::callParametersStringListMethod(const QByteArray &methodName)
+QStringList JCameraPrivate::callParametersStringListMethod(const QByteArray &methodName)
 {
     QMutexLocker parametersLocker(&m_parametersMutex);
 
@@ -1235,7 +1328,6 @@ QStringList JCameraWorker::callParametersStringListMethod(const QByteArray &meth
                 QJNIObjectPrivate string = list.callObjectMethod("get",
                                                                  "(I)Ljava/lang/Object;",
                                                                  i);
-
                 stringList.append(string.toString());
             }
         }
@@ -1244,12 +1336,6 @@ QStringList JCameraWorker::callParametersStringListMethod(const QByteArray &meth
     return stringList;
 }
 
-void JCameraWorker::callVoidMethod(const QByteArray &methodName)
-{
-    m_camera.callMethod<void>(methodName.constData());
-}
-
-
 static JNINativeMethod methods[] = {
     {"notifyAutoFocusComplete", "(IZ)V", (void *)notifyAutoFocusComplete},
     {"notifyPictureExposed", "(I)V", (void *)notifyPictureExposed},
@@ -1259,13 +1345,13 @@ static JNINativeMethod methods[] = {
 
 bool JCamera::initJNI(JNIEnv *env)
 {
-    jclass clazz = env->FindClass("org/qtproject/qt5/android/multimedia/QtCamera");
+    jclass clazz = env->FindClass("org/qtproject/qt5/android/multimedia/QtCameraListener");
     if (env->ExceptionCheck())
         env->ExceptionClear();
 
     if (clazz) {
-        g_qtCameraClass = static_cast<jclass>(env->NewGlobalRef(clazz));
-        if (env->RegisterNatives(g_qtCameraClass,
+        g_qtCameraListenerClass = static_cast<jclass>(env->NewGlobalRef(clazz));
+        if (env->RegisterNatives(g_qtCameraListenerClass,
                                  methods,
                                  sizeof(methods) / sizeof(methods[0])) < 0) {
             return false;
diff --git a/src/plugins/android/src/wrappers/jcamera.h b/src/plugins/android/src/wrappers/jcamera.h
index 81c334eb4..ec5bcc3c7 100644
--- a/src/plugins/android/src/wrappers/jcamera.h
+++ b/src/plugins/android/src/wrappers/jcamera.h
@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 
 class QThread;
 
-class JCameraWorker;
+class JCameraPrivate;
 
 class JCamera : public QObject
 {
@@ -175,9 +175,11 @@ Q_SIGNALS:
     void frameFetched(const QByteArray &frame);
 
 private:
-    JCamera(int cameraId, jobject cam, QThread *workerThread);
+    JCamera(JCameraPrivate *d, QThread *worker);
 
-    JCameraWorker *d;
+    Q_DECLARE_PRIVATE(JCamera)
+    JCameraPrivate *d_ptr;
+    QScopedPointer<QThread> m_worker;
 };
 
 QT_END_NAMESPACE