step 1: install bluestack emulator.
step 2: go in 'sdk\platform-tools' folder
press [Shift button]+[mouse right click]
select 'Open command window here'.
step 3: type 'adb connect localhost' or 'adb connect localhost:5555'
step 4: now run your android project.
(*note: my SDK location is
'C:\Users\[PC-name]\AppData\Local\Android\sdk\platform-tools')