Error: device offline

Question

The emulator is running. But when I write adb shell in my shell I get:

error:device offline

What is the reason for

Answer 1

Method 1 :

run this commands in your linux terminal

sudo adb kill-server
sudo adb devices

run this commands in your CMD

adb kill-server
adb devices

"adb devices" result must show any device with id. If instead of id you are getting off-line means you need to give permission in your tab. Once you enable USB Debugging in android and connect the device for the first time you will get an alert dialog for giving permission. If you are not getting any pop-up then click on Revoke USB Permission in Developer option the try once.

Method 2:

Change the device connected mode from Media to Camera, sometimes this helped me.

Method 3 :

Update the adb as well as device drivers.