1. Trisman's Avatar
    I've searched the forum for answers and it seems that this *might* not be possible...
    Which seems strange!

    The usual response is 'why would you want to do this?', 'use WiFi' or.. No replys....
    I'd be interested if anyone know why it can't be done.

    Reason I ask: Using an Android Tablet as a car Media/Nav/Carputer. The audio-out from the tablet is fed into the car-stereo via. a 3.5mm plug.

    Nav, video etc. all work fine, music stored on the tablet plays nicely through the car stereo, as you'd expect.

    But: There seems to be no way on earth that I can pair a 'phone to this set-up to get either hands-free calls or music stored on my phone played through the car stereo via. A2DP Bluetooth profile to the tablet.

    What is stranger is that I used to be able achieve all this with a Windows CE tablet plugged-into the car stereo as a Nav/Media device.
    I could pair any 'phone to it, make & receive hands-free calls AND control the 'phones music from the CE tablet & (at the risk of repeating myself!), have it play through the car stereo.

    (I stopped using the Win CE device & went to Android, as the CE device boot time for the Nav Software was ridiculous, the touch screen was hopeless, the display was pretty low resolution+ dim & it was impossible to have more than a couple of apps running because of memory & processor limitations).


    So, if the bluetooth pairing I need could be done with Win CE, why can't it be done with Android?!
    01-12-2014 05:17 PM
  2. sauce_a_poutine's Avatar
    BlueTooth is typically a "slave" to the 3.5mm Jack, which has precedence. The idea is that if your BlueTooth dies, you can quickly hook-up with a corded ear-piece&Mic set to talk hands-free. I don't know whether or not this behavior can be changed, but I doubt it.

    Typically, people using a ear-piece Bluetooth like mine, will disable it's "Media layer" and use that "Media layer" and connect it to the car radio to play music on the car radio. (I use my phone in that fashion on a Ford equipped with Sync). This allows to have "private" calls on the ear-piece, yet play music from the Android device on the car radio. (Radio goes mute when phone in use.)

    For file transfers, just get a WiFi hotspot going and use that little ad-hoc network, or use NFC file transfer.
    01-12-2014 05:41 PM
  3. Trisman's Avatar
    Thanks.

    I understand that, but for the life of me I can't see why a device that uses the Android operating system cannot (apparently anyway?) be configured to act as an A2DP bluetooth receiver (like your wireless headphones & car stereo), whereas a Win CE system, (Windows in general for that matter), a Mac etc. can be configured to work in the way I'm trying to achive with my car-mounted tablet! :lol:

    Seems a trick is being missed? There are loads of (usually) Chinese-made car-audio systems that used Android in parallel with Win CE 6.0. The Win CE usually runs the thing, the Android add-on provides useful apps & the nav.

    EDIT: The Android version in the Chinese Stereos usually seems to cap-out at v. 2.2.
    01-12-2014 05:52 PM
  4. sauce_a_poutine's Avatar
    Microsoft probably designed only one driver for BlueTooth, and since it was an early player with BlueTooth, that driver was written to support all of BlueTooth's features, for "real Windows",and instead of making a new driver for WinCE, they just used what they already had coded for Windows without any modifications or tweaking..

    I'll submit this hypothesis: Android sort of grew at the same time as BlueTooth adoption for wireless earpieces and music streaming did, but Android, contrary to Microsoft's stuff, was developed for ultra minimalist hardware specs, so the driver is probably partial, and not capable of supporting everything Bt's specs allows for.

    On top of that, BlueTooth is a work in progress, evolving rapidly, with new functionality we all take for granted today, but truth be told, much of that simply did not exist 3~4 years ago.

    You might want to check out the chaps at XDA, they might have what you want, in form of hacked support for the functions, if your into tinkering with your gear.
    01-13-2014 02:25 AM
  5. Trisman's Avatar
    if your into tinkering with your gear....
    Results of the tinkering to date!

    My BMW efforts so far:

    Click image for larger version. 

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    I think I'll be adding a parrot unit to the HU, at least for now!
    01-19-2014 08:21 PM
  6. Chris Webb2's Avatar
    Using your Android tablet as a "Hands-Free" device is very possible. In fact here is a link to the code to do such: https://android.googlesource.com/pla...thHeadset.java

    Though I have yet to find an, already written, app that can do this...
    05-30-2014 07:33 AM
  7. njgilligan's Avatar
    I'm interested in this as well; I have a Samsung tablet mounted in my car and it would be great to make and receive calls through it from my phone.

    I don't have the programming skills to integrate that piece of code into an app, but I'd be happy to contribute to a project to support someone who does.

    Is anyone aware of any development on this?
    02-25-2015 08:23 AM
  8. illuniel-webos's Avatar
    -up-

    just wondering if anyone has any update nor heard of any app that can do this? I also have a similar set up as the Original Poster.
    08-09-2015 05:39 AM
  9. DesertF0x's Avatar
    There is something in development on xda-developers. Look for "android-4-1-headunit-android-auto". I can not post links yet.
    08-21-2015 02:10 PM
  10. okuribito's Avatar
    I'm in a similar situation. I just bought a new phone... Used to connect the old one to the radio via the 3.5mm to take calls hands free.

    Since I have problems doing the same with the one, I was wondering if there's any app I can install in the old one that Bluetooth pairs to the new phone... So that I can take calls from the old phone that's connected to the radio. Btw my radio is not Bluetooth enabled.

    Anyone tried tablet talk?
    12-11-2015 08:50 PM
  11. Joel Orozco's Avatar
    I'm in a similar situation. I just bought a new phone... Used to connect the old one to the radio via the 3.5mm to take calls hands free.

    Since I have problems doing the same with the one, I was wondering if there's any app I can install in the old one that Bluetooth pairs to the new phone... So that I can take calls from the old phone that's connected to the radio. Btw my radio is not Bluetooth enabled.

    Anyone tried tablet talk?
    Tablet talk user here... needless to say that I had high expectations for that app, unfortunately it only works as a remote controller (like a TV one) for the smartphone, you still have to use BT headset or the smartphone to speak/hear the call since the app doesn't sends/receives audio...
    06-26-2016 03:42 PM
  12. Jacob Ranjbar's Avatar
    You found an app for this yet ? .. deciding whether to get a nexus 7 as a head unit in my 1 series and would love to use it as hands free as well!
    01-01-2017 01:36 PM
  13. hallux's Avatar
    I doubt there's an app. It would have to be a function supported on the kernel level, if not the hardware level. The device would have to change from audio host to audio receiver, which may or may not be possible with the BT transceiver in the device and if it is you'd still likely need OS-level (kernel) support for the change.
    01-01-2017 02:02 PM

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