Android: Added JNI_OnLoad to QtCore

JNI_OnLoad is called for each library during the start-up of a Qt
application on Android. When the JNI_OnLoad is called we can get a
handle to the Java VM and necessary classes which enables us to access
Java API's in QtCore.

Change-Id: I64c1f1106cc0d5ab5a7bc9b22c752c09162fe813
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/src/corelib/kernel/qjnihelpers.cpp b/src/corelib/kernel/qjnihelpers.cpp
new file mode 100644
index 0000000000..a95194b66a
--- /dev/null
+++ b/src/corelib/kernel/qjnihelpers.cpp
@@ -0,0 +1,99 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtCore 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 "qjnihelpers_p.h"
+
+QT_BEGIN_NAMESPACE
+
+static JavaVM *g_javaVM = Q_NULLPTR;
+static jobject g_jActivity = Q_NULLPTR;
+
+static inline bool exceptionCheck(JNIEnv *env)
+{
+    if (env->ExceptionCheck()) {
+#ifdef QT_DEBUG
+        env->ExceptionDescribe();
+#endif // QT_DEBUG
+        env->ExceptionClear();
+        return true;
+    }
+
+    return false;
+}
+
+jint QtAndroidPrivate::initJNI(JavaVM *vm, JNIEnv *env)
+{
+    jclass jQtNative = env->FindClass("org/qtproject/qt5/android/QtNative");
+
+    if (env->ExceptionCheck()) {
+        env->ExceptionClear();
+        return JNI_ERR;
+    }
+
+    jmethodID activityMethodID = env->GetStaticMethodID(jQtNative,
+                                                        "activity",
+                                                        "()Landroid/app/Activity;");
+
+    if (exceptionCheck(env))
+        return JNI_ERR;
+
+    jobject activity = env->CallStaticObjectMethod(jQtNative, activityMethodID);
+    if (exceptionCheck(env))
+        return JNI_ERR;
+
+    g_jActivity = env->NewGlobalRef(activity);
+    g_javaVM = vm;
+
+    return JNI_OK;
+}
+
+
+jobject QtAndroidPrivate::activity()
+{
+    return g_jActivity;
+}
+
+JavaVM *QtAndroidPrivate::javaVM()
+{
+    return g_javaVM;
+}
+
+QT_END_NAMESPACE