xxxxxxxxxx
Go to this path or where ever you have your keytool.exe file
C:\Program Files\Java\jre7\bin
Hold shift and right click -> then press Open command window here
terminal will pop up, paste this in:
keytool -list -v -keystore "C:\Users\"Your-User-Name(no quotes)"\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android
xxxxxxxxxx
flutter doctor -v
Then, go to Android toolchain -> Java binary path -> copy that and add it to env variable
xxxxxxxxxx
Add the path where you have your keytool.exe file saved,
to your system "PATH" environental variable
The path should look something like this "C:\Program Files\Java\jdk1.8.0\bin"