Error when compiling an extension with @Options

[Ulrich_Bien]

@Options is an effective method for restricting parameters. How can I create my own OptionList?

For an extension, I tried to create a list of possible directions (forward, backward, etc.) with the name MoveDirections. To do this, I adapted a copy of the ScreenAnimation class.

This is the extension code:

 @SimpleFunction(description = "Move the robot.")
  public void Move(@Options(MoveDirection.class) String Direction) {
  ...
  }

When compiling, I get this error message:

java.lang.IllegalArgumentException: OptionList Class: de.ullisroboterseite.ursblerobot.MoveDirection is not available. Make sure that it is available to the compiler.

at com.google.appinventor.components.scripts.ComponentProcessor.tryAddOptionList(ComponentProcessor.java:2117)

Trying @SimpleProperty instead of @SimpleFunction gives the same error.

[Taifun]

See the answers here

Need help to adding helper or drop down blocks in extension

Yes, it is possible to include helper blocks in your extension. @BeksOmega has previously provided documentation on how to do that here (see §1.1). I have used these in a small extension that connects to some BLE-enabled scales in order to represent the supported units here. As for the extension template repository, you need to clone it and provide your Java classes defining your extension following the guidelines in the extensions document. The necessary dependencies are listed in the README a…

Taifun

[Joejsanz]

@Ulrich_Bien

When compiling, I get this error message:

java.lang.IllegalArgumentException: OptionList Class: de.ullisroboterseite.ursblerobot.MoveDirection is not available. Make sure that it is available to the compiler.

This is the order in which it works for me.

[JEWEL]

Let us know which extension development platform you are using so we can help you properly.

[Ulrich_Bien]

Thanks to Taifun. It's working fine now!