Develop Reference

Android Studio: USB device not recognized as Android device

I am trying to test an application on my Android phone (Samsung Galaxy S8), but I cannot see it in the available devices menu in Android Studio. I can see it as a USB device is not recognized as an Android device.
This seems strange, considering that I have enabled developer mode on my phone. Furthermore, when I check to see that the driver for the device updated to the latest version, it shows that it is updated correctly.

If you are sure you did everything right, but you are still facing this problem, try to run this command in cmd:
adb kill-server
After that reconnect your phone and run:
adb start-server
And check if your phone is in devices lists by run:
adb devices
(In some cases you should restart the Android studio)

Connected devices are not showing to run the project after updating the android studio to 3.5

i recently updated my android studio after update connected devices are not showing to run the project.(developer options and usb debugging mode all are fine of device side). how can i fix it?

Try to restart adb using terminal, Connect your device and type
"adb devices" command
it will restart adb and ask for the permission in phone

USB Debugging over Wifi

I am unable to debug over wifi.
I have followed below steps.
Go to Android Sdk-> Platform-tools and type cmd
run adb tcpip 5555
adb connect and MY IP ADDRESS
Now i got the result show in below Image.
After my device is connected. I removed my USB cable then i got device list empty.
I have no idea why this is happening.
I have motorola X play Mobile Phone Android 6.0 and having Windows 10 operating System.
Need Help.

For simple one click connection of ADB over wifi - You can try using the Android ADB Plugin from JetBrains. The plugin will internally handle all the setup and you can click-away and connect to adb over wifi without worrying about anything else. Steps to install and use can be found on its GitHub repo page.
Provides an action which allow you quickly connect your Android device
over WiFi to install, run and debug your applications without a USB
connected by pressing one button. Connect your device using a USB
cable and press the Android WiFi ADB button. Once the device be
connected over WiFi you'll see an IntelliJ/Android Studio
notification. Now you can disconnect your USB cable and enjoy
deploying, running and debugging your applications over WiFi. The
version 2.0 enables a window to check which of your devices are
connected or not and connect/disconnect it manually if needed.
Screenshots from the plugin page:

No, minSDk(API 14) > deviceSdk(API 1)

I have been given a device(ZTE Qlux 4g) by a client as a testing device for some app. I work on Ubuntu 14.04. This same phone will be distributed to 500 cab drivers, so I can't avoid testing on this phone.
I'm not getting this error on any other device(Nexus4, Nexus5, Moto E, Xperia Z). I obviously have developers option & USB debugging enabled. I installed the app by downloading the APK via email & it runs.
When I connect this device to my Ubuntu machine, logcat shows just this 1 line:
01-01 00:00:00.000 0-0/? E/Internal: insufficient permissions for device
Any help in any direction will be greatly appreciated.

The ZTE Qlux 4g uses Android 4.4, i.e. API 20. So either the given device is not genuine or have some bug in the device itself or ubuntu is not compatible with the ZTE Qlux 4g.
So what you can do is first, try this on any other OS like windows/ mac (if possible).
If the problem persists then ask the client to give another device of same model.

I was getting this error message:
Solution was on the command prompt, restart the connection with the command “adb kill-server”. Then reconnect the device.
Some background information about the device I'm using. The device I'm using is a test box (not a phone) that connects to my Laptop (Android Studio) via a USB cable or Ethernet cable. In order for me to connect the device, I had to do this:
Android Box Setup. Do these things before proceeding to bottom steps:
1) Connect the Laptop running Android Studio to the Gateway via USB cable or Ethernet (RJ45) cable.
2) Connect the Gateway to the same WiFi network as the laptop.
How to use the USB port to debug:
1) Open Command Prompt
2) Go to wherever you stored adb.exe file
3) Type in “adb connect ”. For example “adb connect 192.168.1.84” or “adb connect 192.168.1.94”.
3a) The IP address of the Android device can be found in Settings -> About tablet -> Status ->IP Address
3b) If the IP address of the Box is something like 10.134.114.51, then make sure that the box is connected to the same WiFi network as the laptop.
If you’re in the adb.exe directory, other adb commands include:
1) adb devices= Finds all devices currently connected to your computer.
2) adb kill-server= Disconnects the devices

Ubuntu 16.04
Virtualbox 5.0.24
Android 4.4-r5
Android Studio 2.1.2
I was getting these errors:
Emulator unknown emulator-5554 disconnected.
But I was able to connect to the android virtual machine in a shell outside of Android Studio.
To resolve this, in Android Studio I had to start the terminal (icon on the bottom left) and run the following:
netstat -ln | grep 5555 ;# As expected adb server was alive.
adb connect <ANDROID_VIRTUAL_MACHINE_IP_ADDR>:5555
Then the Innotek GmbH Virtual (Android 4.4.4 API19) machine item showed up above the emulator-5554 disconnected. I selected it and the debugger was working.

How to get a list of all connected Android devices, using the command line on a Mac

I need to pull up a list of all Android devices connected to a Mac computer, using the command-line. The Mac is running Yosemite. Any shell script would be helpful, thanks!

if you need show connected devices, first check android debug is enabled and then in your command line, run adb devices.