Wait for Android emulator to be running before next shell command?

Question

I started an Android emulator using the following shell command:

emulator -avd TEST_AVD 

The emulator starts just fine, but the shell script never finishes executing. It just hangs there even after the emulator has completed startup. I have tried with a number of other arguments that I could find, but nothing could quite do what I want it to. How do I know, or stop the shell command, when the emulator is ready to go?

I am setting up our Jenkins CI to use a Jenkinsfile to start the emulator, and then run a series of gradle commands. In short, I'd like to do this:

sh "emulator -avd TEST_AVD" sh "./gradlew clean test spoon" 

However, I don't want to run the gradle tasks until the emulator has finished startup, and I can't figure out how to do that in the terminal.

Answer 1

If you want to do something after you start the emulator you should start it in the background

emulator -avd TEST_AVD & adb wait-for-device # other stuff here 

adb can wait for a device over a transport to be in a particular state

  adb wait-for[-<transport>]-<state>                                - wait for device to be in the given state:                                  device, recovery, sideload, or bootloader                                  Transport is: usb, local or any [default=any]