[android] Android Emulator Error Message: "PANIC: Missing emulator engine program for 'x86' CPUS."

Navigate to the emulator folder located within Android SDK folder / emulator

cd ${ANDROID_HOME}/emulator

Then type these command to open emulator without android studio:

$ ./emulator -list-avds
$ ./emulator -avd Nexus_5X_API_28_x86

Nexus_5X_API_28_x86 is My AVD you need to give your AVD name