Thank you for your fast answering!
I'll try to find a way to modify the dcmu.img. Maybe it is possible to make the RDS Data and the Signal Quality Data public to read this in the App.
My new Androidradio from XTRONS saves all Data RDS AF, RDS PI. If I call any preset, the radio changes automatically to the strongest AF, without waiting for new RDS Data, because it saves all RDS AF Frequencies with the RDS PI Code in every Preset, to get the Station easier, if we move to another location.
Kind regards