NNG apps are not yet suitable for use with Android Auto.
You can use a mirroring system called "screentoauto s2a" to replicate your phone screen in android auto. But it's not simple and depending on the phone brands, you may have problems with mirroring or with the operation of the touch on the car display.
Furthermore, the previous apks of primo and nextgen (up to Luna 9.35.2.153810) emit the sound only in android auto which is mixed with the present apks, but they do not bypass the car's infotainment system (like sygic or tt for example) and when you listen to DAB or FM directly you will not hear the indications.
The problem has been solved with the new apks (Luna Israel 9.35.2.263562, Avic 9.35.2.227616, Navigation 9.35.2.272868 for example) but, except Frontzosd, I haven't seen any skinner in public yet experimenting with these apks.