Hello everyone! I have been trying to track down a problem with my Galaxy S4 Active that has been driving me nuts for a while. I figured that making a new thread would probably be best because I did not find my particular issue listed.
Basically, what happens is that I will make a call over Bluetooth and everything will be fine. Once this call has ended, all audio related to phone calls dies. The phone still behaves as if it is making and receiving calls, but nobody can hear me and I cannot hear them. Not over Bluetooth, through the earpiece, nor over the loudspeaker. It’s all dead. I also cannot hear it ringing if I dial out, but the phone itself still rings.
I have tried turning the Bluetooth device on and off, disabling Bluetooth and turning it back on, going into Airplane mode and back out again, turning speakerphone on and off, muting and unmuting the call, and muting and unmuting the phone itself. The only thing that fixes this situation is restarting the phone.
I recall this situation first started presenting itself after updating to the ML2 firmware, but it didn’t happen all the time. It became much more apparent after updating to the NE3 firmware. At that point I spent some more time looking into it and became able to readily duplicate the issue.
I have gone so far as to reflash the NE3 firmware with Odin 3.07 to see if the issue remained. Interestingly enough, this appeared to correct the issue until I started updating and reinstalling a few apps. So now I’m trying to track down exactly what did it.
I suspect that it may be the “OK Google” hotword scanning from Google Search because I had it set to detect “From any screen” as well as “From lock screen”. Although I did not have the “Bluetooth headset” setting enabled because I wanted to take that out of the equation. Once I turned off “From any screen”, the Bluetooth appears to be working normally.
Another possibility is that I had frozen S-Voice because it got in the way of the normal voice dialer. This has been restored. I also have to mention that the voice dialer appears to be more stable after disabling “From any screen” as well.
I also can’t say for sure, but it also seems to happen more frequently when charging. Although that may just be a coincidence as I normally do charge my phone when I connect it to Bluetooth. Also I have duplicated the issue when not charging and gotten it to work fine while on the charger. So it is probably just a coincidence.
Here is what I’m working with:
AT&T Galaxy S4 Active (SGH-i537) reflashed back to I537UCUCNE3 Android 4.4.2 stock firmware.
Jabra SP700 - Main device I’m testing with. Old Bluetooth 1.1 speakerphone that clips on a visor. Supports A2DP for an FM transmitter to stream music, but I have Media disabled on it. I tested with and without this setting and it made no difference. It worked great back when I was on MF3, but started having problems since I upgraded to ML2 that are easily replicated now on NE3.
Jabra BT620s - Secondary device that I tested with that also demonstrated the same problems. Although I haven’t tested as much as the SP700. This is a pair of stereo headphones that uses Bluetooth 1.2 and A2DP for streaming music. Also worked better with older firmwares, but I haven’t used it much lately save for testing this problem.
Installed/Updated Programs:
Facebook
Facebook Messenger
Google Authenticator
Google Chrome
Google Maps
Google Play Newsstand
Google Play Services
Google Play Store
Google Search
Google Voice
Google Hangouts
Jift
SuperSU
Titanium Backup
Titanium Backup PRO
towelroot
YouTube
Other apps that I updated and then I rolled back to get things working:
AllShareCase Dongle S/W Update
Amazon Kindle
ANT Radio Service
ANT+ Plugins Service
Antivirus & Security | Lookout
Beaming Service for Samsung
Beats Music
Blurb Checkout
Gmail
Google Drive
Google Play Books
Google Play Games
Google Play Movies
Google Text-to-Speech
Google+
GROUP PLAY
HP Print Service Plugin
Lux
myAT&T
Samsung Link
Samsung Print Service Plugin
Samsung Push Service
Samsung WatchON (Video)
Samsung WatchON (On TV)
YP - Yellow Pages local search
I also tested it quite a bit right before and after rooting it and it was working fine at the time, so I don’t believe that it’s related to root.
I would like to know if anyone else has encountered similar issues or can duplicate what I’m seeing?
Thanks!
After spending some more time testing it, I can verify that it IS in fact the “OK Google” hotword scanning from Google Search 3.6.14.1337016.arm. When it is set to detect “From any screen” and well as “From lock screen”, the audio will die after the first call over Bluetooth. Once I turned off “From any screen”, the Bluetooth works normally.
Now that I've finally found it and can easily replicate it, I'm still curious if other people can replicate it or if this is something isolated to my phone and/or Bluetooth devices. Would anyone be interested in testing this with me?
I'm planning on writing up some feedback on it once I have a better idea of how big an issue it is. I think it would also help anyone else that runs into this problem. I've been fighting with this off and on for over a month because it seemed so random.
Thanks.
I am having the exact same issue with the 2 s4's that I own. I suspected it was either svoice or Ok google, I will try to turn off the from any screen setting and see if it fixes the issue on mine as well. That is a shame because I really like using the ok google feature from any screen.
I've been having the same issue, but did not realize it was ok google from any screen. I've turned it off now, let's see if it works. Thanks for the heads up.
It looks like a recent Google Search update re-enabled the "From any screen" OK Google hotword detection setting. This still is not fixed and it killed all call audio while I was trying to lead another vehicle. I didn't find out until I parked that it was turned back on.
I have sent feedback to Google on the Search app and recommend that everyone else who has had this problem do the same. If this continues to happen, I will resort to negative reviews if I must. Please help get the word out if you are having the same issue. Thanks!
EDIT:
There are apparently several other people having the same problem on other Samsung devices (particularly Galaxy S4's):
https://productforums.google.com/forum/#!msg/websearch/mEhHyCs6F5o/HVArojlzIrAJ
http://forums.androidcentral.com/sa...-sound-phone-calls-after-using-bluetooth.html
5.1 did not fix the bluetooth issues I had...it actually added another bug.
New with 5.1:
-When playing music with Google Play Music, whenever I switch tracks, the screen turns on. Why?
Still a problem after 5.1:
-Sometimes Bluetooth plays but without sound - it takes some weird opening/closing/pausing/starting maneuvering to hopefully get it working
-Pause during notifications does not work properly - I've tried this with Google Maps and a few different podcast apps. With Google Maps Navigation on and a podcast playing...when Google Maps wants to talk, it pauses the podcast (as the setting says) but the Google Maps notification is muted. It's just silence until it is done and then the podcast resumes.
Is anyone else having these sort of issues?
Nexus 6, 5.1D, stock, rooted ,twrp, with my 2013 Cadillac ATS
Yes it is happening to others myself included. why? I have no idea. But you are certainly not alone.
Sent from my Google N6 on VZ
I just posted this in the General section ....
OTA'd the 5.1 update on 3/26/15.
Since then, contact addresses fail to appear on vehicle displays over Bluetooth.
Rebooted phone / Forgot and paired phone to vehicle, no fix.
Phone is paired to 2 vehicles with the same results.
Can anyone confirm this?
Having the same issue. If you disable ambient display, the screen will stay off when selecting tracks with Bluetooth. My issue with Bluetooth is that every few days I have to reboot the phone to get the BT to work. I can't even toggle Bluetooth. When I do, it says Bluetooth turning off, it toggles back on by itself. Tried force closing all running apps but dosent help.
Bluetooth...
jeffreii said:
5.1 did not fix the bluetooth issues I had...it actually added another bug.
New with 5.1:
-When playing music with Google Play Music, whenever I switch tracks, the screen turns on. Why?
Still a problem after 5.1:
-Sometimes Bluetooth plays but without sound - it takes some weird opening/closing/pausing/starting maneuvering to hopefully get it working
-Pause during notifications does not work properly - I've tried this with Google Maps and a few different podcast apps. With Google Maps Navigation on and a podcast playing...when Google Maps wants to talk, it pauses the podcast (as the setting says) but the Google Maps notification is muted. It's just silence until it is done and then the podcast resumes.
Is anyone else having these sort of issues?
Nexus 6, 5.1D, stock, rooted ,twrp, with my 2013 Cadillac ATS
Click to expand...
Click to collapse
When it comes to bluetooth problems, especially with cars and this phone you will find very few helpful answers. Sad but true, not many Nexus 6 people seem to use hands free automobile applications on their device. I had to buy a new head unit for my car along with all the other bullcrap to make it look nice in my car to get some of these puzzling problems to disappear. Android Auto works great if you have the supporting gear in your car and follow the instructions about how to pair phone with car and use the right USB port and wire in your Nexus. After that, everything works as expected. Unfortunately you do have to spend some cash and time to do this but it is the future and if you plan and use your phone in car more than anywhere else, it is worth the investment and will improve with time. The only good take away from all this is, so far only nexus devices running lollipop work with Android Auto supporting head units.
vvveith said:
When it comes to bluetooth problems, especially with cars and this phone you will find very few helpful answers. Sad but true, not many Nexus 6 people seem to use hands free automobile applications on their device. I had to buy a new head unit for my car along with all the other bullcrap to make it look nice in my car to get some of these puzzling problems to disappear. Android Auto works great if you have the supporting gear in your car and follow the instructions about how to pair phone with car and use the right USB port and wire in your Nexus. After that, everything works as expected. Unfortunately you do have to spend some cash and time to do this but it is the future and if you plan and use your phone in car more than anywhere else, it is worth the investment and will improve with time. The only good take away from all this is, so far only nexus devices running lollipop work with Android Auto supporting head units.
Click to expand...
Click to collapse
It wasn't perfect, but my Bluetooth was just fine pre 5.1...I can deal with the quirks and avoid spending $$ on Android Auto (for now at least)...but these major bugs need to be fixed ASAP.
Do we know if this is fixed?
Is this fixed in 5.1.1? Is there an issue logged with google? Anyone?
I have my nexus 6 rooted with 5.1.1 stock and the bluetooth doesn't work. I cannot see any device but the other devices can see it.
I have tried to fix it clearing cache and data (only bluetooth) but the problem is still there.
Do you have any idea guys?
This morning I remembered my experiments with my old gt-9100 and I have decided to do wipe cache and wipe dalvik-cache.
And now... bluetooth is alive!!!
[emoji39]
Hi All,
I've been extremely excited about the integration of my smartphone with my car for a while. Almost anyone who would be in the market for a motor vehicle with an advanced head unit would also already own a smartphone with data access.
However, like any new use of technology, there are growing pains and Android Auto is no different. I have struggled through a few issues already and continue to grapple with others. A huge difficulty I had was simply finding discussion threads. Do I look on sites that focus on cars? On Android Auto? On Android OS?
So here it is. I'm starting a thread to pull together the most common problems and their solutions. Also, please note - I am not an expert in any of these things, just a user. I will give credit where I have a source but I am just gathering the info into one place and adding it to my own observations.
I haven't decided how this thread is going to look or if it will be small or big, so I will save the first few message placeholders in case and I will add known problems, work-arounds, and identified solutions as they come.
Hopefully this helps out some other users!
Troubleshooting:
I strongly suggest you make sure you have a good quality USB cable and confirm that you are able to connect your phone to your computer and transfer a file (some cables will allow charging but not data transfer).
1. Problem: Bluetooth won't pair, won't connect, etc.
Possible Solution:
It appears that Android Auto will attempt to create a BT profile. So
a) Delete the pairing on your cell phone
b) Delete the pairing on your car head unit
c) Turn OFF bluetooth on your phone
d) Plug your phone into your car's head unit. Depending on your settings, you may need to tell your car to launch Android Auto and you may need to select the device. If so, make sure you are selecting it in Android Auto (NOT Bluetooth pairing). Respond appropriately to any requests for authorization on your phone and car.
This should leave you with a properly paired device and car.
2. Problem: Every time I launch Android Auto, I have to pair my phone again!
Work-around: Once you have a working AA connection between the car and your device, go into the settings in the Android Auto app on your device and turn off the option to "Add new cars to Android Auto."
3. Problem: Android Auto notifies me of a new message but won't read it out loud/but starts to read it and cuts off.
It looks like there is a conflict between Google Now, Android Auto, and the Bluetooth handoff with the car head unit. Kudos to XDA member BuildaWall for discovering that turning off the BT headset option in Google Now fixed it for some people. I did a little more testing and found that forcing Android Auto to make your phone the primary source of audio seems to be the other piece.
UPDATE:I applied the August CM-13 Snapshot and this workaround no longer fixes the problem. I have reheaded it as a possible work-around as it might fix the issue for people on slightly older ROMs
UPDATE Sept 27/2016: I have upgraded to stock Nougat (Android 7). This issue still exists. However, after reading this XDA article, I tested an accessibility option. AA began reading the messages once again.
Possible Work-arounds:
A) Several people reported that their Media volume on their phone was being changed to zero when they plugged into AA. Some also reported that turning USB Debugging OFF fixed this issue. If you don't know what USB debugging is, don't worry about it; you would have to have intentionally turned it on. For volume, tap your volume rocker but then tap the drop down on the pop up volume notification.. It will expand to multiple volume sliders. For simplicity, make sure none are zero.
B) On your phone, go into Google Now, Options, Settings, Voice and then turn off Bluetooth Headset. This was reported to help by some but not didn't help for me.
C) On your car's head unit, in Android Auto, select a music option (I have Spotify and Google Play Music, but I think any audio source app within AA will work). If you don't want to listen to anything, just play and then pause/stop it but you CANNOT go back to the car as a primary source (eg radio or sirusXM).
D) On Nougat (Android 7) go to settings, accessibility, and enable one of the options (I have tested Voice Access, but in theory, activating any accessibility option should reactivate the message reading in AA.
4. Reported with work-around by @ReppinTheSouth - Android auto either being laggy or flat-out disconnecting
ReppinTheSouth observed this on a Pioneer avh 4100 and a galaxy s4 and reported August 7, 2016
Suggested Work-Around: Clearing the phone's cache periodically seems to help a lot. I also added a swap file which has seemed to help even more.
5. Reported by @ReppinTheSouth - When driving in maps with voice commands enabled, it will freeze sometimes right when a voice command is about to come on. My GPS will no longer track and my head unit at least an Android auto is completely unresponsive.
I'm not listing this as a work-around, as it doesn't resolve the problem, but is still good to know: @ReppinTheSouth advises: This only happens when voice commands are enabled & Unplugging and replugging the phone gets the head unit out of its frozen state.
More to come!
Tips and Tricks:
I will use this page to list tips to improve performance or usability that don't fit under troubleshooting.
1. Keeping the phone screen alive and accessible.
Please exercise safe driving habits.
TL; DR:
Turn on Developer options
Turn on Stay Awake
Optional: if you have a security lock you may want to add your car Bluetooth as a trusted device for smart lock so it doesn't lock you out.
Details:
Android Auto changes your screen timeout to 15 seconds every time it is activated. When combined with its flaws with hangouts chat notification (no groups, can't initiate a new chat without certain contact book entries, can't access chats that began before connecting to AA) it is VERY frustrating.
Access the Developer Options menu
Settings >>> About Phone
Scroll to the bottom and tap the Build Number option seven times in a row. You will get some sort of message saying you have access to developer options. You only need to do this once.
Settings >>> Developer Options
Make sure they are turned on. Next turn on the Stay Awake option.
Your phone will now allow dimming but won't turn off the display.
Optional:
If you use a security lock on your device, you may want to authorize your car Bluetooth connection as a trusted device under smart lock so it won't lock while connected.
==============================
Links to Other Resources:
https://forums.oneplus.net/threads/...to-connected-to-the-cara-infotainment.488786/
Thanks for this thread Mad Medik.
However, I also have the same problem as number 3, but the workaround doesn't work.... I changed my phone Bluetooth Headset setting to off and I was playing my spotify music through Android Auto. Am I forgetting something here? what versions of AA and Whatsapp do you use?
Good thread and it is much needed as far as I am concerned. I have a Pioneer avh 4100 and a galaxy s4. One of the issues I have had is with Android auto either being laggy or flat-out disconnecting for no reason. One of the things I have noticed is Android auto seems to be a resource hog. Clearing the phone's cache periodically seems to help a lot. I also added a swap file which has seemed to help even more.
The other issue I'm having which I can't solve is when driving in maps with voice commands enabled, it will freeze sometimes right when a voice command is about to come on. My GPS will no longer track and my head unit at least an Android auto is completely unresponsive. I have to unplug my phone and then plug it back up to get it to work. This only happens when voice commands are enabled. I have not been able to resolve this issue.
Sent from my SPH-L720T using XDA-Developers mobile app
NLatuny said:
Thanks for this thread Mad Medik.
However, I also have the same problem as number 3, but the workaround doesn't work
Click to expand...
Click to collapse
Hi NLatuny & ReppinTheSouth!
@NLatuny - Thanks for the info. I just updated my Nexus 6p to the latest (august 2016) CM13 Snapshot, and the work-around no longer fixes the problem for me either. I've updated the original post. I think your request for version numbers is probably a good idea moving forward. I will update the original post to suggest that people include that in their posts.
@ReppinTheSouth - Thanks! I will look at adding those problems and your possible solutions for the lag to the top of the thread
Might be good to add a list of things you can and cannot do. For example, I found the other day through just trying you could ask various questions.
How old is (enter famous person here). = Correct answer.
I need to remember some of the other ones I've done. Good thread.
---------- Post added at 10:42 AM ---------- Previous post was at 10:40 AM ----------
Perhaps also add how to get into Developer Mode, and what the settings in there do? The Force Day or Night mode thing is super useful.
I am not sure if this is the righjt place to ask, but I have been everywhere with no answer.
I Have a Galaxy s7 edge in a Mercedes a class. It connects just fine, but I cannot make calls saying "call >name>". Maps, Music, weather works just fine, but when I try to make a call, the woman just replies "not sure how to help you with "call..."". I can dial numbers as well BTW.
Making calls through Google Now works fine as well.
Any help would be much apiciated.
duze76 said:
I am not sure if this is the righjt place to ask, but I have been everywhere with no answer.
I Have a Galaxy s7 edge in a Mercedes a class. It connects just fine, but I cannot make calls saying "call >name>". Maps, Music, weather works just fine, but when I try to make a call, the woman just replies "not sure how to help you with "call..."". I can dial numbers as well BTW.
Making calls through Google Now works fine as well.
Any help would be much apiciated.
Click to expand...
Click to collapse
Check your permissions for Android Auto, you may have missed a few.
You can also uninstall and reinstall it.
I have tried all that, with no luck unfortunately
Having had a courtesy car for a few days that had an android auto system in I'm looking to purchase an android auto headunit for my car, probably after Christmas.
Until then I've been using my handsets connected to the aux input on my factory system. However since I got my Pixel handset last week I've encountered a couple of issues that weren't an issue on my m9 handset previously. I've reported then to the relevant support sites but as yet have received no response, so thought I would try you knowledgeable lot.
Firstly, when making or recurving phone calls with the aux cable connected the Pixel defaults to using the loudspeaker on the handset rather than putting through the aux to my car speakers.
Secondly, when receiving a message on WhatsApp i touch the screen too get it to read the message, it does so fine, then tells me I can press the mic soon symbol and say reply. When I do so I'm told "this chat app is not installed or needs an update". The app is installed and is up to date. I can send WhatsApp messages by saying "send a WhatsApp message to...." but can't reply.
Lastly, when I ask it to play specific tracks on Spotify it often comes back with no search results. Songs that I used to ask it to play regularly on my previous device come back as no search results found. Searching manually the tracks are there and can be played. And it isn't all tracks, some tracks are found without issue.
Thanks in advance.
Also hope this is in the right thread, I notice you seem to be taking mainly about the in car systems but as it can now be used on most android phones without a dedicated in car system I figured many would be doing so.
Hi folks, sorry for the absence. My N6P died on me in November and was sent away for warranty repair. Long story short, I'm very disappointed with Huawei and futuretel. Two months later, the process ended with me owning an unfixed Nexus 6P which is still under warranty until February 2017. It has a defective motherboard according the repair center but they will not repair it. So, after 2 months of making do with an iPhone 6 with a broken screen (wife's old phone), I have moved on to a One Plus 3T.
Irritatingly, Apple Carplay worked flawlessly for that time. Typical of Apple it was very locked down and had limited options. But in fairness, it executed those few features very well. Come on Google!
[/end rant]
I'm back and will try to get the thread up to date.
MM
Sent from my ONEPLUS A3000 using Tapatalk
Hello, thank you very much for this information, is very useful.
In my case, I have a Le Pro 3 X720 and is nightmare with AA, when I plug the phone on my Hyundai car the phone only charge so I had to change their ROM to lineage is 14.1 (Android 7.1.2) and with this AA starts quickly but after 5 minutes the screen is freeze then change the cable but it doesn't work, I change the cable again with the same result, so I back to use the original leeco cable and change their ROM again, with the same result, after 5 minutes the screen is freeze, the last one is AICP 12.1 (Android 7.1.2).
Do you know how to fix this?
Thank you in advance for your response.
Hello everyone,
i found this thread and i hope that is the correct one for my problem.
In the first page i read that AA set the screen timeout to 15sec when activate, but in my case, the timeout remain also after when i unplug the phone from my car.
If i manually set the timeout to 5 minutes, after the first screen lock, it return to 15sec and this is so frustrating.
So i tried to set the stay awke mode in the developer options, but i see that the description of this setting is "when is on charge" (i'm italian, i don't know the english description, sorry), there is some walkaround to fix the 15sec also after the unplug ?
Thanks in advance
mikefavro said:
Hello everyone,
i found this thread and i hope that is the correct one for my problem.
In the first page i read that AA set the screen timeout to 15sec when activate, but in my case, the timeout remain also after when i unplug the phone from my car.
If i manually set the timeout to 5 minutes, after the first screen lock, it return to 15sec and this is so frustrating.
So i tried to set the stay awke mode in the developer options, but i see that the description of this setting is "when is on charge" (i'm italian, i don't know the english description, sorry), there is some walkaround to fix the 15sec also after the unplug ?
Thanks in advance
Click to expand...
Click to collapse
Hi Mike,
You should say what phone and android version you are using. I have used both a One Plus 3T on Oreo beta and an LG V30 on 7.1.2.
The screen timeout sets to 15 sec when I plug in, but returns to normal when I unplug.
Sent from my LG-H933 using Tapatalk
I recently purchased a new VW car and have been using Android Auto on the built in display. The first time I used it it all worked perfectly, since then it hasn't. My Android Auto no longer gives me notifications when I receive texts. And if they do show up on the home screen and I click the play button to read them, it shows the four dots as if its thinking but nothing happens and I have to cancel out of it.
Additionally, I've noticed that my bluetooth smart lock doesn't seem to be working at all. Every time I connect it asks if I want to add my car to my trusted devices. Each time I say yes but it NEVER seems to save it. It will then later sometimes prompt for permission to read my messages. To this I again say yes but it doesn't seem to make the message issue go away even after I do this. I am not sure if these two issues are related (I'm hoping they are).
Can anyone tell me why the hell my smart lock can't seem to register and remember my car? And why wont android auto read my messages properly? (Pixel XL. Phone calls and navigation all are working properly)
Same issue here
You have to give Android Auto all permissions it asks for at the first start. And be sure to use a very good cable. There are many USB C cables on market which are not fully supporting USB C features and the system do expect them.
I'm in the same situation with my VW Atlas. Problem is with both my Pixel (running Android O) and my wife's Nexus 6p (running Nougat). I have given it all permissions, including some that it didn't ask for. I also have been using the little 4 inch cord that came with the 6p, so the cable or its length should not be an issue. In addition to the above, my car also forgets its bluetooth pairings if I try to connect the AA cable before the bluetooth has connected. I've been learning to do that but sometimes I forget. It's got to be an issue with the VW software.
I have come across these issues myself in a Golf Mk7 both with a Motorola Droid Turbo and now with a Google Pixel 3 XL.
In the case of getting Android Auto to read/send messages where you just get the four dots bouncing up and down and doing nothing else, that's a setting with the Google Assistant app. Go into that app on your phone (the round G icon) and drill into settings and under Voice >> Voice Match, make sure "OK Google" detection is turned on. Even though you might not be actually using it, it has to be turned on for this to work. Totally lame and non-intuitive, but that's what fixed that for me.
As for the car falling out of your Smart Lock and for repeatedly prompting you for permission to access your text messages, I have only had this issue with AA in my VW and not in other cars, so it's a VW-specific issue and something to do with the bluetooth hardware. I do not have a fix for it but the workaround is you must have BT turned on on your phone first and let it connect fully to your car OUTSIDE of AA. Make sure at that point you permit text message access (if prompted) and check your Smart Lock and add your car to it if needed. Then going forward whenever you connect to your car you MUST let BT connect fully first before you plug in and fire up AA. It's unfortunate that you can't just plug in and go w/o waiting for BT first but that's the only way I've gotten this to work without re-prompting me for SMS access permissions and Smart Lock.
Good luck!
This one is really annoying me - with my new Dacia Jogger, I've found that Android Auto always thinks I'm driving, even when parked, with the engine off. The problem with this is some navigation apps completely disable the ability to search for a destination, so I can't progam in a route once I'm connected! Also Gameshack is disabled because AA thinks I'm driving too.
There any way to fix this or stop AA from disabling interactions?
Your headunit has a wire connected to the handbrake sensor in your car, and this way it knows if you're parked and can't restrict some activities. This information is passed from the headunit's firmware to Android Auto internally, and this way Android Auto can restrict or allow you to do some stuff like use the touchpad, use certain buttons, etc.
In order to save money (or due to a bad Android Auto implementation), some headunits don't send handbrake status information to Android Auto. This way you can use the onscreen voice button all the time (in the lower corner of Android Auto) even if the car is moving, but the downside is that some Android Features get broken, like Gamesnacks or alphabetic search in lists. They can do this for a number of reasons, like not having a dedicated voice button in the steering wheel or headunit, but it's not the ideal case.
I suggest you to find other people with the same car model and see if their cars behave in the same way. If so, then this is a headunit problem and the carmaker should release a fix. If this only happens in your car, I would check if there's a wiring issue in the handbrake or something similar is happening.
you might also want to check if there's some settings menu in your headunit with some option to check this.
You can also try to sync a new phone over bluetooth to your car headunit while parked. If it refuses because the car is moving (even if is not) then it could be a wiring issue.