No better way to watch German TV channels on Android than German Tv by Olster Group. You may be a Germany fan or not but you can't get these channels on your local cable or satellite TV. So hop on to App which is for Android devices and totally free.
It doesn't use any extra devices and has following channels for your individual taste.
Light Channel TV Deuchland
ORF 1 HQ
ORF 2 EUROPE HQ
ORF 2 HQ
ORF 3 HQ
ORF SPORT+ HQ
RTL Tele Letzebourg
Though the App supports all connections like Wifi/3g/4g it is recommended that you use wi-fi connection with unlimited data plan because the channels are data hogs and you will be left with a big big internet bill.
Please download the App from Google Play. Post in your comments on the App.