I am trying to use a USB DAC with my Android head unit. While it works well with most apps, it doesn’t output sound when making Bluetooth calls. I did some research, and it’s said that because the mic is used during the calls, the system handles the sound differently. It mentions that there should be settings to force the Bluetooth call sound to be output through USB. However, I couldn’t find the settings and also couldn’t use apps mentioned like Lesser AudioSwitch, for they are not supported in Android 9 and later. Anyone can help shed some light on the matter? Much appreciated.

If I connect my phone via Bluetooth to my car (2016 Toyota Corolla), and then play music using the **Google Play Music** app, the car shows a **Browse** button, which allows me to navigate through artists and albums with the car's buttons: If I install another app, it doesn't show the Browse button on the car stereo. Apps that produce a Browse button: - Google Play Music ☠ (RIP ) - Samsung Music - Sony Music (does not show the RAND or RPT buttons) Apps that do not produce a Browse button: - AIMP - BlackPlayer - Canaree - FPlay (found by searching for "AVRCP") - JetAudio (found by searching for "AVRCP") - kure - MediaMonkey - Music [com.maxfour.music] - Music [com.android.music stock] - Music Player Go - Musicolet - Nyx - Odyssey - Omnia - Oto - Phonograph - Vinyl - Pretty Good - Pulsar - Retro - Metro - Samba Player (found by searching for "AVRCP") - Shuttle - Shuttle+ - Simple Music Player [com.simplemobiletools.musicplayer] - Timber - Vanilla - VLC - **YouTube Music** Is there some Bluetooth feature that needs to be supported by an app in order for this button to show up? What is the feature's name? How do I find apps that have it? This is especially important now that Google has killed off Google Play Music and replaced it with YouTube Music, which does not provide this Browse button on a Bluetooth connection. If I knew what this function was called, I could try to pester Google, or the third-party app developers, and ask them to add support for it.

I purchased an Android car head unit (K4811) and I cannot access a USB storage device that I plug in (32 GB, FAT32 or exFAT). I think that this comes from the absence of a program allowing elevation of rights, because by downloading FileManager+, when I select the USB key, I obtain this message: But if I click "OK", I get the error "Application not found": I tried from the Google "Files" application, it shows me that I have to "Tap to give File access": If I do, I get an "Access denied": If I click on the notification that appears when plugging in the USB key: This opens the basic file explorer in which the USB key does not even appear. Do you have any idea where this could come from? If an application allowing rights elevation is missing, is it possible to download it? I will be able to pass it by another means than a USB key. My goal is to access the files on an external USB storage key. EDIT ---- The application has storage access rights according to Android settings:

I have a Samsung Galaxy S10 Plus and an Android car screen that I bought recently. My car is a Mazda 3 sedan 2018 (display with no touchscreen). The head unit is connected to a DSP, amplifier, and 2-way 6,5" components. This is because I'm always looking for a better sound quality, therefore I reproduce music with my phone through DAC Fiio Q11 which sends the clean signal to my car head unit via a 4.4 balanced jack cable. The problem comes with the Android car screen. When I connect it to my phone through BT, everything works fine except the music because the screen starts playing with its own internal speakers even when I disable the audio option in BT settings. Also, I try to go to individual external player settings and set it to play music only on my phone, but the problem remains. So I was searching for this kind of problem and didn't find any solution. I have tried 4 Android apps and still nothing. So I wonder, how can I lock the BT audio output in order to force the audio output of my phone?

I have an AC82271 Android head unit on Android 12. I went into engineering mode (by inputting 56789 as the PIN on the factory settings screen) to increase the mic volume, but it just immediately went back to zero even though it says it saved successfully. Can anyone explain how to save the settings, please?

I have a damaged screen and touch digitizer on an automotive head unit. I am trying to access the diagnostics menu for the unit (Honda Clarity 2018 PHEV non-touring), but the touch input keys are not (to my knowledge) among the standard Android keyevent codes. Is there some way to pull these directly from the head unit itself? I have root on the unit, and I did find some keyboard data files but the enclosed keyevent codes don't appear to all be functional, and it isn't clear from the descriptors which keys would match with the necessary inputs (Power, Menu, and Screen Brightness, the first two of which are not the standard Android ones). EDIT: here's a picture of the keys in question. Note that these do **not** correspond to the Android generic equivalents, e.g., keyevent 24 & 25 will invoke the Android native UI's volume control, but not the same as these keys; same for the rest of the keys.

I originally asked [this question](https://android.stackexchange.com/questions/252453/how-to-enumerate-all-possible-adb-shell-input-keyevent-codes-for-a-device) , but it never received any responses save for a few comments. I'd like to broaden my approach, and ask if there is anyway to enumerate a list of **all** possible inputs that an Android device can receive? I've come across [this](https://stackoverflow.com/questions/6990978/how-can-i-know-which-of-the-dev-input-eventx-x-0-7-have-the-linux-input-stre) post as well just earlier (currently still attempting to digest the information). Here is a list of devices, output from cat /proc/bus/input/devices:

I: Bus=0019 Vendor=0001 Product=0001 Version=0100
N: Name="gpio-keys"
P: Phys=gpio-keys/input0
S: Sysfs=/devices/platform/gpio-keys.0/input/input0
U: Uniq=
H: Handlers=kbd event0
B: PROP=0
B: EV=3
B: KEY=8000 0 0 0 0

I: Bus=001c Vendor=0000 Product=0000 Version=0000
N: Name="a3g4250d"
P: Phys=
S: Sysfs=/devices/platform/spi_tegra.4/spi4.2/input/input2
U: Uniq=
H: Handlers=event2
B: PROP=0
B: EV=9
B: ABS=7

I: Bus=001c Vendor=0000 Product=0000 Version=0000
N: Name="a3g4250d_temp"
P: Phys=
S: Sysfs=/devices/platform/spi_tegra.4/spi4.2/input/input3
U: Uniq=
H: Handlers=event3
B: PROP=0
B: EV=9
B: ABS=100 0

I: Bus=0018 Vendor=0001 Product=0002 Version=0000
N: Name="uinput4strgsw"
P: Phys=
S: Sysfs=/devices/virtual/input/input4
U: Uniq=
H: Handlers=kbd event4
B: PROP=0
B: EV=3
B: KEY=1fff0000 0 0 0 0 0 0 7 f8000000 0

I: Bus=0018 Vendor=2222 Product=2222 Version=0000
N: Name="uinput4lvds"
P: Phys=
S: Sysfs=/devices/virtual/input/input6
U: Uniq=
H: Handlers=kbd event5
B: PROP=0
B: EV=b
B: KEY=1000 40000800 0 0 0 0
B: ABS=600000 0

I: Bus=0003 Vendor=0e8f Product=2519 Version=0110
N: Name="HID 0e8f:2519"
P: Phys=usb-tegra-ehci.1-1/input1
S: Sysfs=/devices/platform/tegra-ehci.1/usb1/1-1/1-1:1.1/input/input9
U: Uniq=
H: Handlers=kbd mouse0 event1
B: PROP=0
B: EV=1f
B: KEY=4837fff 72ff32d bf544446 0 0 1f0001 20f90 8b17c000 677bfa d941dfed 9ed680 4400 0 10000002
B: REL=143
B: ABS=1 0
B: MSC=10

I have a full blown Android 13 car head unit - EX-ALS215 (Snapdragon 662). Audio is output from a 3.5mm jack socket on the unit's harness (audio-out socket). I have then connected a Cyrus Soundkey DAC/AMP to one of the USB sockets of the head unit. All audio is now output via the DAC except phone calls and the audio from the AV-IN. (AV-IN is part of the unit's harness and is where I plug my TV tuner as input [Video/L/R]) So, voice calls and AV-IN persist in coming out of the 'audio-out' socket on the harness. **Why is this happening and how can all audio be routed to USB?** **Clue#1:** I have tested the Cyrus Soundkey with a Samsung Galaxy A53 and when making a phone call the audio from the call was correctly routed to the earphones plugged into the DAC. The microphone used during the call was the one built into the A53. I am at a loss as to what is happening. **UPDATE#1 (01 Feb 2024):** I used adb to investigate why this is happening. Can you see anything obvious in the text files? or Would you like me to try something else? **OBSERVATIONS:** 1. I am no expert, but is dumpsys audio showing the "Cyrus Soundkey" (usb_headset(4000000)) being the default for voice calls? post.com/forums/attachment.php?attachmentid=3377686&d=1706801391 2. dumpsys media_session : shows the com.wits.ksw.bt application (the KSW BT dialer) making a voice call? Does this mean that kswBt tries to output to the Soundkey and it fails, defaulting back to the builtin speakerphone (as seen in practice)? **UPDATE:** This entry does NOT represent a phone call. Instead it represents BT audio played on my phone via this BT app which is also responsible for voice calls. Indeed BT audio from my phone played using this app, does go through the USB DAC. **SUGGESTIONS:** 1. Is it possible that the Soundkey is being rejected due to an audio incompatibility with the telephony audio (24bit vs 16bit or something)? 2. Someone suggested that A FiiO Q3 DAC would work with voice calls because it supports USB Audio Class 1.0. Others have said that a FiiO K3 DAC which also supports USB Audio Class 1.0 exhibited the same problem with voice calls. (FYI. The former has a unit from same manufacturer as mine, bought 2 years ago and upgraded to A13 & current firmware. The latter was from same manufacturer in 2020 A10.) **LINKS TO FILES:** dumpsys audio , media.audio_policy , dumpsys media_session , media.audio_flinger .

After buying an Android '13'† Head unit with a screen higher resolution than my previous stereo, I found that it didn't offer any options to change the font or icon size in it's accessibility options, so text is too small at arms length, where the screen is. Since there are no after market ROMs for this device yet, I wonder if there is any other way to change these settings via an app, or by editing a configuration file somewhere? I have enabled Developer options on this device and can enable adb if needed. † About may say "Android 13", but it's probably a lie, it looks more like Android 10, but I would like to know the most reliable way to work it out.

I have a USB disk with MP3 music connected. Everytime when the Pumpkin radio has booted, it recognizes the USB disk and starts the preinstalled media player automatically, which starts playing the first song from the disk. This is annoying, and furthermore, I'm not satisfied with this app cause it lacks relevant features. I want that the media player "Phonograph", which I have installed, starts instead. I have asked Pumpkin support, they say it is not possible to change the default media player app. I have looked in the settings "**Apps -> Standard apps**", but there is no setting for the topic "Mediaplayer" available (there is a setting for the default browser and one other topic, only) I tried to disable this default player app (I forgot the name) but not possible, is greyed out. Does anyone have an idea? If possible, without root. Thank you.

I need to set static IP on an Android 10 head unit where there is no ethernet settings page enabled so I couldn't set it by the touch panel. I try to set the address with adb command (adb root) and I was able to set it by using ifconfig eth0 . But at the boot, the system forgot this setting. Where could I set it in a general configuration file that set the static IP configuration permanently?

I am working on a pre-rooted Android head unit. I can do "adb root" or "adb shell su" using wifi adb. So there is root access and Su binary on the device. But I can't use root applications because there is no app to grant root access. I have tried installing supersu or superuser on /system/app. I made it install the apps but they say "device not rooted" when I try to run them. So how can I make supersu see my su binary?

On Android head units, the orientation typically defaults to landscape. And has disabled auto-rotation, the screen will always remain in a landscape mode. This effectively means you can't use any software on Google Play Store or other places to change this default because auto-rotation is disabled. I need to change this feature to portrait for custom firmware I have placed on my head unit (using Android 10). I have installed Magisk. In my attempts to work out how to do this, I have gathered some information, but I have not got enough experience or knowledge to know how to do this. I really need guidance. I believe in order to do this correctly, this needs to be done at root, and place in one of these locations in Magisk (1) /sbin/.magisk/.core/post-fs-data.d/ or (2) /data/adb/service.d/ and the command syntax would look something like this (3)

adb shell settings put system accelerometer_rotation 0 # auto-rotation, 0 disable, 1 enable
adb shell settings put system user_rotation 0 # actual-rotation, clockwise, options 0[0°], 1[90°],2[180°],3[270°]

Source:- https://stackoverflow.com/questions/25864385/changing-android-device-orientation-with-adb or (4)

content insert --uri content://settings/system --bind name:s:accelerometer_rotation --bind value:i:0
content insert --uri content://settings/system --bind name:s:user_rotation --bind value:i:0

or (5)

import android.provider.Settings;

// You can get ContentResolver from the Context
Settings.System.putInt(getContentResolver(), Settings.System.ACCELEROMETER_ROTATION, 0);
Settings.System.putInt(getContentResolver(), Settings.System.USER_ROTATION, 0);

or something else (Other source documents) https://android.stackexchange.com/questions/67648/how-to-change-android-default-natural-orientation/148038#148038 Thank you for any time you invest in this.

Got an Android head unit with no physical buttons (has 1 tiny reset hole only). I was playing around with developer settings and enabled Simulate Secondary Displays with 4K option. Unfortunately this lead to the simulated display overlay taking over the entire screen with no way to get rid of it as the touchscreen is not unresponsive over the overlay. As a note, USB debugging mode was not enabled on the headunit prior to this happening. I've hooked up a USB keyboard and have managed to get to the app drawer but can't seem to find a way to scroll through and select the "settings" app. Pressing 'TAB' or the arrow keys don't seem to be able to cycle through the app drawer. If anyone could help with any of the 3 solutions, I would be grateful: 1. How to navigate through app drawer to get to "settings" app on android via USB keyboard? 2. How to bring up the android search bar with the keyboard only (that way I can search for "settings") 3. How to boot up android headunit in safe mode (tried it on my mobile phone and was able to disable simulated display once in safe mode). However my headunit has no physical buttons. Thanks this is as far as I can get with keyboard - can't seem to browse the apps inside the app drawer

I just upgraded my head unit to Woodman Big B on Android 8.1. I'm not finding a good way to dial out someone from the head unit. I am connected to my mobile through Bluetooth. How to call or dial from my head unit through Bluetooth?

I'm trying to install a custom rom on my Lenovo D1 head unit but since it doesn't have physical buttons i'm struggling to get my device in to recovery mode. The reason I'm trying this is my device is very slow sometime so i thought i should try a lightweight ROM, no specific one yet but im gonna try multiple ones. Anyone know how can i achieve this? Thanks

I'd like to use an old(er) Android phone as a Music Player left always connected in my car. I have an ignition controlled USB socket in the car, and would also connect the 3.5mm jack to the Aux In of the car. Is there a way to set a Music Player (e.g. MediaMonkey) to 'continue' playing when power is supplied to the USB charging cable, and then stop when power is disconnected? The reason I'd like to do this is because the Infotainment system in my car (Mazda CX-5) is horribly slow to start up, and music on USB memory stick or played over Bluetooth from my phone takes 2-3 minutes to start up (whereas music connected via the Aux-In starts up almost immediately). I have Android Auto and that's even worse! I've searched this (and other) forums without finding anything that does this simply. Thanks!

I have Android car unit on Peugeot 307 SW (2007). It has Bluetooth, but it's only for making calls. I want to play music on it, and I don't want to buy any adapters. Google Maps can tell the directions over the car's Bluetooth as Bluetooth phone call, so it should be possible for other apps to do so.  Is there a way to play music over Bluetooth as Bluetooth phone call? Alternatively, are there music apps that can play music as Bluetooth phone call?

Every time that I connect via USB my not-rooted Galaxy S6 (SM-G920F with stock Android 7.0) to my car (a Kia Soul 2015), this popup annoys me: "The connected device is unable to access data on this device. Reconnect the USB cable and try again. Android File Transfer or Samsung Smart Switch..." and I have to touch "OK" to dismiss it. I dismissed it so many times that at this point I have nightmares at night about this popup that tries to kill me wrapping itself around me and taking my breath away. What I tried is to set "USB configuration" to "Charge this phone". In this case the popup doesn't appear when I plug the USB cable, but after a while, if I also have enabled "USB debugging" (that I need), the "USB configuration" reverts to "MTP (Media Transfer Protocol)" by itself and the popup reappear at the next cable plug. Double annoyance! Any way to kill that popup definitely? (My car in this case: Kia Soul 2015)

I got a head unit in my car that runs android 10. I'm kind of disappoint with this unit, and the most annoying thing is the loading time at boot, since I need to go reverse and need to wait for the rear camera. I saw on youtube that there is an option to make the device not going to sleep for hours/days (under Settings > Car settings)... but I can't find "Car settings" on my device. I was also looking for it under Settings > Display, but no luck again. Any suggestions? Thanks