How can you access the classes in Android in the C++ code in Qt Creator? It is seemingly not possible to access classes not directly supported by QtAndroidExtras import.
e.g. TextView, BlueToothReceiver, and the countless many useful classes
Here is a good example:
http://doc.qt.io/qt-5/qtandroidextras-notification-example.html
It is possible to call any class from C++ per jni.