title: what will i do to resolve this error "emulator-5554 disconnected! Cancelling activity launch'!"?
body: <p>i had tried all my best efforts to resolve this error but i am still struck would anybody help me please??
  emulator-5554 disconnected! Cancelling 'com.hellos.ArithmaticCalculatorActivity activity launch'!
  i did not find any devices in the devices. is there any way i can resolve these error?</p>