Hi,
For highly specific platform API, you will have to write some platform specific code. Qt can't cover absolutely everything and it's not its goal.
Android is a bit of a special case because of its use of Java. You should take a look at the QtAndroidExtras module and its examples. Note that this is really specific to Android and how it works.
There are other extras modules for some often used platform specific stuff that you can take a look at in terms of how things can be done. Note that these modules have been deprecated for Qt 6 in favor of a different approach and integration in a more centralized way.