Mastering Qt Android
summary
Shows how to extend Qt on Android using JNI to call Java from C++ and vice versa, with a working SD‑card listener implemented end-to-end. Uses the Android extras module to call Java methods, covers two JNI registration approaches (template names exported per method versus a single JNI_OnLoad that calls RegisterNatives), and shows importing Gradle into Android Studio for Java editing and debugging. Explains the two‑thread model (Android vs Qt) and safe cross‑thread calls via runOnUiThread and QMetaObject::invokeMethod.
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chapters (10)
- 0:00Introduction to Qt Android
- 1:10What is JNI and why use it
- 3:40Calling Java from C++
- 5:47Calling C++ from Java
- 14:25SD card notification example
- 20:36Qt Android app architecture
- 24:08Extending Java part
- 29:49C++ implementation details
- 35:10Thread safety and event loops
- 41:39Q&A session
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