Getting the error "device not found" when running a apk file from Android emulator

Question

I am trying to install an apk file from command prompt but getting an error "Device not found".

Answer 1

try "adb devices" first and see the list of devices connected.
If the phone does not appear, do this :
"adb kill-server" wait a few seconds then "adb start-server"
If the phone appears in the list but its name is ?????, you have an issue of permission.
If the phone appears fine, you might have an issue in your command. Then check the following :

Is your phone in debugging mode?
Have you added the debuggable tag to the manifest of your application?
is the phone properly connected with the cable to your computer?
Have you done everything correctly on this page.

Answer 2

Fist turn on the emulator and then go to prompt and type:

adb install yourfile