How suitable is Qt QML for building android applications?

Question

Android

How suitable is Qt QML for building android applications? Are there any problems? What is your personal experience?
Are all Android features or functions available?

1. Ability to create an overlay window (to show a timer, for example).
2. Ability to communicate with Bluetooth (for communication with Mi Band 4).
3. Ability to intercept messages from applications (Telegram, Whatsapp).

I want to make a pomodoro timer that will send notifications to Mi Band 4. Mi Fit capabilities are not satisfactory (you cannot set up a separate type of vibration for a specific application).

Answer 1

In principle, this is a working option (2Gis, for example), but immediately tune in to the fact that you will have to write some part in Java. Most of the problems are with text fields, the conditional application of the radio station can be made, and the conditional messenger is better native.
1. Most likely, only in native code
2. It will probably be possible using Qt tools: https://doc.qt.io/qt-5/qtbluetooth-index.html
3. Exactly only in native code