1 files changed, 67 insertions, 0 deletions
diff --git a/src/plugins/platforms/android/androidbackendregister.h b/src/plugins/platforms/android/androidbackendregister.h
new file mode 100644
index 0000000000..c186f7e107
--- /dev/null
+++ b/src/plugins/platforms/android/androidbackendregister.h
@@ -0,0 +1,67 @@
+// Copyright (C) 2024 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef ANDROIDBACKENDREGISTER_H
+#define ANDROIDBACKENDREGISTER_H
+
+#include <type_traits>
+
+#include <QtCore/qjnienvironment.h>
+#include <QtCore/qjnitypes.h>
+#include <QtCore/qjniobject.h>
+
+#include <QtCore/qstring.h>
+#include <QtCore/qmap.h>
+#include <QtCore/qmutex.h>
+#include <QtCore/qloggingcategory.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcAndroidBackendRegister)
+
+template <typename T>
+using ValidInterfaceType = std::enable_if_t<std::is_base_of_v<QtJniTypes::JObjectBase, T>, bool>;
+
+class AndroidBackendRegister
+{
+public:
+    static bool registerNatives();
+
+    template <typename T, ValidInterfaceType<T> = true>
+    [[nodiscard]] T getInterface()
+    {
+        QMutexLocker lock(&m_registerMutex);
+        return m_register.value(QString(QtJniTypes::Traits<T>::className().data()));
+    }
+
+    template <typename Object>
+    using IsObjectType =
+            typename std::disjunction<std::is_base_of<QJniObject, Object>,
+                                      std::is_base_of<QtJniTypes::JObjectBase, Object>>;
+
+    template <typename Interface, typename Ret, typename... Args,
+              ValidInterfaceType<Interface> = true>
+    auto callInterface(const char *func, Args... args)
+    {
+        if (const auto obj = getInterface<Interface>(); obj.isValid())
+            return obj.template callMethod<Ret, Args...>(func, std::forward<Args>(args)...);
+
+        if constexpr (IsObjectType<Ret>::value)
+            return Ret(QJniObject());
+        if constexpr (!std::is_same_v<Ret, void>)
+            return Ret{};
+    }
+
+private:
+    QMutex m_registerMutex;
+    QMap<QString, QJniObject> m_register;
+
+    static void registerBackend(JNIEnv *, jclass, jclass interfaceClass, jobject interface);
+    Q_DECLARE_JNI_NATIVE_METHOD_IN_CURRENT_SCOPE(registerBackend)
+    static void unregisterBackend(JNIEnv *, jclass, jclass interfaceClass);
+    Q_DECLARE_JNI_NATIVE_METHOD_IN_CURRENT_SCOPE(unregisterBackend)
+};
+
+QT_END_NAMESPACE
+
+#endif // ANDROIDBACKENDREGISTER_H