Waiting for target device to come online

1.端口占用

netstat -ano | findstr "5037" 

2.Android
Emulator 未打开

down voteaccepted

I was also having the same issue 2 days ago when i update my android studio, today I solve my issue when I was playing around with settings then I saw that in my SDK tools setting Android Emulator is uncheck so I simply checked that box and now emulator is working fine. Try this steps may work for you also: Go to SDK tools > SDK Tools Check Android Emulator and click Apply

3、SDK环境变量不对

Setting the system variable ANDROID_SDK_ROOT to the path used by Android studio solved the issue for me:

In Android Studio fire up Tools>Android>SDK Manager, navigate to Appearance & behavior>System Settings>Android SDK

Copy the path from "Android SDK Location"

Add ANDROID_SDK_ROOT to your system variables and assign the path

Restart Android Studio

33down voteaccepted

I was also having the same issue 2 days ago when i update my android studio, today I solve my issue when I was playing around with settings then I saw that in my SDK tools setting Android Emulator is uncheck so I simply checked that box and now emulator is working fine. Try this steps may work for you also: Go to SDK tools > SDK Tools Check Android Emulator and click Apply