[HTC 10 Questions & Answers] roirraW "edor" ehT:
Half question, half observation, and half speculation. That's three halves, only two of which make 100% but two out of three ain't bad.

On the completely stock but rooted 8.0 and also on the latest 8.0-based Leedroid ROM on a U.S. Unlocked HTC 10 (with latest TWRP and latest compatible SuperSU), playing music through Rocket Player on Android Auto in my 2017 Chevy Impala requires me to first load Google Play Music, play just for a moment, and then I can pause (or leave alone, doesn't matter) and switch back to Rocket Player and hit play, and it'll play just fine (it'll automatically pause Google Play Music if I hadn't already).

It's consistent - every single time (just in case "consistent" wasn't clear enough LOL). I haven't tried any AOSP/CM-based ROM, older or newer. I'm looking to keep all regular phone and text functionality so that rules out beta versions of AOSiP 8.x. Once I stop the car and restart, I have to go through the same workaround again to use Rocket Player.

With both my wife's and my Google Pixels (hers the XL 128 GB and mine, unfortunately so far, the regular Pixel 32 GB), Rocket Player works immediately.

I have done searching and reading, both through Google searching and searching specifically in the XDA Q&A and Guide/Discussion sections. Although I've seen other problems I haven't specifically found this one mentioned.

Weird! If anyone has any ideas other than switching to Google Play Music, please let me know. FYI, I've also tried disabling Google Play Music, which of course only made it so that I can't use the workaround I found, and I do plan on looking into what other music players support both Android Auto and ReplayGain. If anyone has any suggestions for a music player that fit those two requirements besides Rocket Player, I'd appreciate those suggestions as well.

Thanks!

Supports both ReplayGain and Android Auto

:

Rocket Player, but with the caveat on stock HTC 10 Oreo and latest Oreo Leedroid that each time I want to use Rocket Player, I have to temporarily start playing with Google Play Music first. This problem doesn't happen on the Google Pixel with Rocket Player.

I also just noticed that the description of both the free Rocket Player and paid Rocket Player unlocker don't even mention the Android Auto feature which it most definitely does support, so perhaps I should look at all music players that do mention ReplayGain but don't mention Android Auto.

GoneMAD, description only mentions ReplayGain but I happened to notice a review in the Play Store that mentions how good it's Android Auto capability works. I don't understand why these media player authors wouldn't tout their player's Android Auto compatibility if they have it. I'll try it and report back.

Update: GoneMAD seems to have no issue on the HTC 10, I can go straight to playing in GoneMAD without playing using Google Play Music first. Since testing for an hour or so, repeatedly, I disabled the Google Play Music and Rocket Player apps, and I'll test GoneMAD again over the next few days and/or a week before I decide to buy the unlocked version from this 14-day trial version.

Those that seem to support ReplayGain but not Android Auto

(haven't tried Neutron so don't absolutely know that it doesn't support Android Auto):

PowerAmp (public beta 703 in Play Store)

Neutron

Those that seem to support Android Auto but not ReplayGain

(I have not actually tested any but Google Play Music, but the description of the others don't mention ReplayGain):

Google Play Music

Pulsar

MD Player

Doesn't seem to support either ReplayGain or Android Auto

(haven't tried any, but nothing in the description about those features):

doubleTwist

BlackPlayer (free or paid)

Equalizer

Shuttle

Shuttle+

Musixmatch