Fix Camera's frame rate and change it resolution

[Skroopa]

Hi to everyone!
Can it possible to fix frame rate and change resolution of Camera? Tried to use viewfinder.maximumFrameRate, viewfinder.minimumFrameRate and viewfinder.resolution - no effect.
How can I access the QML Camera from Android's Java side (I mean in QtActivity class)?
What does Qt use for creating Camera on Android devices?