AA Passenger – Android Auto control for passengers

This app allows a passenger to control an Android Auto device connected to the car.

Features:

Play your own music via car speakers
Send destinations from Google Maps to Android Auto for navigation
Display pictures on the Android Auto screen (e.g. the hotel, so the driver would easily find it)

XDA Thread

https://forum.xda-developers.com/android-auto/android-auto-general/app-aa-passenger-remotely-control-t3713198

What's new

1.9-alpha9
- AA Passenger: fixed Oreo crash
- AA Passenger: fixed casting volume
1.9-alpha8
- audio streaming, without root! (experimental)
- audio streaming, without passenger app! (experimental)
- works also with Hotspot active on the driver's device
- AA Passenger now also available from Play Store
- driver's app is now called AA 2nd Seat, not AA Remote
- now compatible with Android 5.0 Lollipop
- many bugs squashed
- support for an NFC tag which launches or installs AA Passenger app
Note that both driver's and passenger's apps must be updated to work together.

Requirements

Two devices are needed: one would be connected to the car ("driver's device") and have Android Auto app installed. The other ("passenger's device") will be able to control it.

The connection is established using either Wi-fi Direct (P2P) or Android Hotspot (in this case Hotspot must be manually activated before starting Android Auto).

Note that Wi-fi Direct is not always robust and your mileage may vary. Please test and report the results.

Note that this is now alpha quality, so expect some glitches and report them in the XDA thread linked above.

Minimum supported Android version is ~~6.0~~5.0 (Lollipop).

Not officially supported for non-projected (on the phone screen) Android Auto, although audio streaming seems to work.

Installation

For initial setup and connection test no car is required. :)

Driver's device

Download AA 2nd Seat APK and install it on the driver's device.
Open Android Auto app and enable "Unknown sources":
- In the Android Auto app open the Hamburger menu.
- Open About.
- Tap "About Android Auto" header 10 times, until "Developer mode enabled" toast appears.
- Tap dots on the top right of the screen.
- Select "Developer settings" from the menu and enable "Unknown sources".
If in doubt, see this video.

Passenger's device

Download the AA Passenger app from Github or from Play Store, install it on the passenger's device and run. A nice wizard will appear, guiding you through the next steps.
Enjoy.

Non-standard audio streaming

Normally, to stream audio with the AA Passenger app, nothing special is needed. When connected, the app displays an "Audio Streaming" button.

Below are described some ways to stream audio in a non-standard way.

Audio streaming without AA Passenger app (experimental)

Start Hotspot on the driver's device, then connect to the car and start Android Auto.
Connect with any Android phone to the hotspot.
Cast screen using Cast option in the Settings app or the quick settings bar.
- Driver's device should be visible to Cast as "No-app Car Streaming".
- If Cast is not in Settings, use Google Home app.
- Do not use the Cast button found in media apps, like Play Music or Youtube. These use a different technology. Use system-wide screen mirroring, even though only audio will be streamed.

Please report your experiences in the XDA thread.

Audio streaming with root

If the passenger's device is rooted, you may install Audio Capture Service on it instead of relying on a trick with Cast.

NFC tag

It's possible to make a nice and shiny NFC tag and place it in the car, so that the passengers with NFC-capable phones can easily get the AA Passenger app.

Just write the URL below to an NFC tag:

https://storage.googleapis.com/aapassenger-static/nfc.html

If the AA Passenger app is already installed, tapping this tag will open it. Otherwise the website above will be opened.