Have you been able to get your Processing emulator to work? Using a Mac I got the same error message that you posted but now have the emulator working and have successfully run your demo code. The first step was to be certain that the emulator is listed in Android Studio at the top of the IDE under the Devices menu. If the emulator that you want to use is not listed then use AndroidStudio/Tools/AVD Manager to create the corresponding Virtual Device. Then I went into AndroidStudio/Tools/SDK Manager/SDK Tools and made certain that the latest update for the Android Emulator was installed (30.6.5). Click on the minus sign at the left to change it to a check mark to install it. You may have to reinstall Processing/Tools/Add Tool/Modes/Android Mode after updating. From there it worked as expected. There are also Terminal commands that you can use to run the emulator, but that is more complicated and I won’t list it here unless you want to try it.
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