I am using Redmi Note 5 Pro as a physical device to connect to the android studio. A night before everything was working fine and I was able to install apps from android studio to my physical device and view Logs with ease but Now apparently it's not working and showing the device as NULL. Please help.
I tried the post method but it is not working for me.
PS: The only thing I did was update a system update MIUI 9.5.14.0 in between but I suppose that should not be the reason for this.
OS: Ubuntu 16.04 LTS
As pointed out in the post
~/Android/Sdk/platform-tools> ./adb devices
Then restart the adb despite it shows device by
~/Android/Sdk/platform-tools$> ./adb kill-server
~/Android/Sdk/platform-tools$> sudo ./adb devices
This worked for me. Since it showed the device as against the answer in post prior to killing the adb server.
A more permanent solution instead of restarting the adb service every time you can add a udev rule so that you can always access the device.
See: https://stackoverflow.com/a/51554826/5815054
I'm working with adb and android studio on mac.
I've noticed that everytime i leave work and come back in the morning, the adb doesn't find the device who's plugged.
What i've tried so far :
Unplugging the usb both from the laptop and the device, and plug it again - adb still doesn't recognise my device.
Restarting the adb by running 2 commands :
adb kill-server
adb start-server
Restarting my mac.
Only the 3rd option worked. However, i don't want to restart my computer every morning, only if i have no other option.
Adb showing no devices :
For some reason the Mac loses authorization for USB debugging after sleeping. The only solution that I have found to work is the big hammer approach...
$ rm ~/.android/adbkeys ~/.android/adbkeys.pub
Then reconnect your USB cable. There are likely significant downsides to this approach, but it certainly works in the short term until a smarter solution is developed.
This was not always a problem, it has crept in with the newer releases of Android Studio. Its probably not really a MAC problem, but an Android Studio problem.
I don't think you need to reboot the MAC, just restart Android Studio. Make sure it shuts down properly first.
Hello i am trying to run my android app on eclipse and i have this problem:
The connection to adb is down, and a severe error has occured.
You must restart adb and Eclipse.
Please ensure that adb is correctly located at '/Users/giannis/android-sdks/platform-tools/adb' and can be executed.
any idea about the problem?
Since adb is installed and seems to be working, Eclipse is probably having a problem finding or starting adb. First, check that Eclipse has the right location set for the sdk (Window->Preferences->Android or slightly different on Mac). I think it should based on the error message. Then, if you still can't run the app from Eclipse, try starting adb from the command line with adb start-server.
EDIT: If the app still won't run after doing the above, make sure adb is able to find your device or emulator. Start the emulator or connect your device, then run adb devices from the terminal. If your device or emulator is not listed, adb can't connect to it. If it is an actual device, make sure USB debugging under developer options in the device settings is enabled.
When I try to Run (or Debug) my project in eclipse, the AVD emulator emulator boots normally but eclipse doesn't recognise it. On DDMS, the Devices tab does not find the AVD emulator and thus I see no traffic in the LogCat.
On the other hand, when I plug my phone and choose Run (or Debug) project, eclipse connects to the phone and works just fine (I see it on DDMS on LogCat shows traffic). Any thoughts on this one?
I'm using Eclipse_Galileo_5.2 and Google APIs (API level 12, Platform 3.1). I was working with the same setup before the problem appeared without any problems.
I highly appreciate all the help...
Simply run from command line adb kill-server and then adb start-server. ADB will reattach to the running emulator and will be able to work with it. Do not exit the emulator as bashu suggests as the problem is likely to appear again if you have a slower computer.
Lots of time it happens to me also.
What i do is, I first Exit the Emulator. Then kill adb using
adb kill-server after that i clean the project.
and then adb start-server
and finally run the application and it works fine for me.
Thanks.
I use "adb devices" to get following result. Only one device is connected to PC by USB, but we get 8 lines of result.
Could anyone suggest the reason?
WH96TNE00361 offline
WH96TNE00361 offline
WH96TNE00361 offline
WH96TNE00361 offline
WH96TNE00361 offline
WH96TNE00361 offline
WH96TNE00361 offline
WH96TNE00361 offline
Try the following:
Unplug the usb and plug it back again.
Go to the Settings -> Applications -> Development of your device
and uncheck the USB debugging mode and then check it back again.
Restart the adb on your PC.
adb kill-server
and then
adb start-server
Restart your device and try again.
To complete the previous answers, another possible solution is to change the USB socket in which your cable is plugged in.
I had this problem (with the classical answer about using adb kill-server / start-server not working) and it solved it.
Actually, it took some time to find that because Windows was correctly recognizing the device in my first socket. But not ADB. As Windows was recognizing the device, I had no real need to test other USB physical sockets. I should have.
So you can try to plug the cable in all your USB physical sockets directly available on your computer. It did worked for me. Sometimes the USB sockets are not managed the same way by a computer.
Beginning from Android 4.2.2, you must confirm on your device that it is being attached to a trusted computer. It will work with adb version 1.0.31 and above.
adb kill-server
adb start-server
that solved my problem
I've had a similar issue with one of my phones.
I was unable to connect and use usb debugging on any of my computers.
In the end, I had to restart the usb debugging on the phone manually [doing so using the Developer menu was not enough].
There's only one command you have to run on your phone [I did it using Terminal Emulator app]:
adb usb
And that was it.
Hope this helps someone in the future.
You may also try downloading newest version of adb http://developer.android.com/tools/help/adb.html
Reboot the device. This always fixes it on Mac OS, whereas adb kill-server does not.
On my Galaxy Nexus with Android 4.2.2, I had the same problem initially, 'adb devices' was showing the device but with offline status (USB debugging was initially active on my device).
These are the steps I took to remedy the situation :
Disable USB debugging (Device not connected to PC)
Re enable USB debugging
Now connect to your PC, now a pop up on the device (not on PC) will ask you for authenticating the PC, Thats it...
adb devices now lists both device id and no offline.
I post here my question just in case is helpful for somebody else.
My problem was that my colleague was connected to the same device and I was not able to connect to the same device.
Note: I had this problem with Amazon Fire TV connecting over Wifi.
There are 2 solutions:
Easy to "drop" his connection (sorry buddy :)
Restart the device
adb kill-server
adb start-server
adb connect device-ip
A bit more difficult but two clients can use the same device (use different TCP ports)
Please look at this answer
For me with Android 4.1.1 only rebooting device works
Run SDk Manager and install Android SDK Tools and Android SDK Platform-tools updates. ADB must be updated to a new version for 4.2.x
I had the same issue and none of the other answers worked. It seems to occur frequently when you connect to the device using the wifi mode (running command 'adb tcpip 5555'). I found this solution, its sort of a workaround but it does work.
Disconnect the usb (or turn off devices wifi if your connected over wifi)
Close eclipse/other IDE
Check your running programs for adb.exe (Task manager in Windows). If its running, Terminate it.
Restart your android device
After your device restarts, connect it via USB and run 'adb devices'. This should start the adb daemon. And you should see your device online again.
This process is a little lengthy but its the only one that has worked everytime for me.
Had this on client's machine it turned out he had an out of date version of adb installed via website offering adb and fastboot. The client in question didn't want to install the whole SDK because of perceived bloat :S .
So if you're seeing offline make sure you've downloaded and using the latest adb. I ended up emailing him adb executable.
Also worth checking that the adb you are using is the correct one in the Path. i.e on Mac
$ which adb
/Users/me/dev/adt-bundle-mac-x86_64/sdk-macosx/platform-tools/adb
if non of the steps work from the above. my device still offline after connected through wifi. i did the following:
go to your device...
go to settings.
go to developer options.
Allow adb debugging in charge mode only.
repeat the steps as you always do . which is:
a. connet your usb on chargemode only.
b. open command write:
- adb tcpip 4455
- adb connect 192.168.1.11:4455
b. disconnect usb.
now everythings work for me .
make sure the device is set for usb debugging
Have the adb client running (e.g. via "adb usb" or adb start-server"
LEAVE the device connected via usb!!!
AND THEN reboot the device.
This always brings my Motorola MB525 "online" again, after adb complains it would be "offline". I'm using OSX btw.
I made adb working on Android 4.4.2 with GT-N8010 (Samsung tablet) after setting device in authorized mode once upgraded adb to SDK version.
~/local/opt/Android/Sdk/platform-tools/adb
Android Debug Bridge version 1.0.32
While It did not work using :
adb version
Android Debug Bridge version 1.0.31
Shiped in Ubuntu LTS version :
apt-cache show android-tools-adb | grep Version
Version: 4.2.2+git20130218-3ubuntu23
This link may help then
Can't connect Nexus 4 to adb: unauthorized
After wasting hours on it, I have updated my version of adb and now adb devices shows my device online and I can run the app on it again.
also make sure adb isn't running in your processes automatically. If it's there right click open file location, figure out what is starting it, kill it with fire. Run the updated adb from an updated android sdk platform tools. This was the issue with mine, hope it helps someone.
What did me in is was that multiple unrelated software packages just happened to install adb.exe -- in particular for me (on Windoze), the phone OEM driver installation package "helpfully" also installed adb.exe into C:\windows, and this directory appears in %PATH% long before the platform-tools directory of my android SDK. Unsurprisingly, the adb.exe included in the phone OEM driver package is MUCH older than the one in the updated android sdk.
So adb worked just fine for me until one day something caused me to update the windows drivers for my phone. Once I did that, absolutely NOTHING would make my phone status change from "offline" -- but the problem had nothing to do with the driver. It was simply that the driver package had installed a different adb.exe - and a MUCH older one - into a directory with higher precedence.
To fix my installation I simply altered the PATH environment variable to make the sdk's adb.exe have priority.
A quick check suggested to me that "lots" of different packages include adb.exe, so be careful not to insert an older one into your toolchain unintentionally.
I must really be getting old: I don't ever remember such a stupid issue taking so endlessly long to uncover.
Check that the ADB version that you are running is newer than the version of the OS on the connected devices. For me, updating the ADB helped to get the device online.