Dear 富傑 莊,
Thank you for your question.
The Package is a container storing ink and its interpretation as an ordered collection of parts. It can be saved as a file on the file system and later reloaded or shared between users.
For further details, please check the Storage section of the documentation:
I cloned the example from the GitHub.
In the demo/DocumentController.java, there are newPackage(), openPackage and savePackage() functions.
And I cloned another example from GitHub-additional_examples.
In the batchmode/MainActivity.java, there is only 'create a new package' code segment at onCreate() status.
In the lasso/MainActivity.java, there are 'create a new package' code segment at onCreate() status and 'delete package' code segment at onDestory() status.
What is the content of the file used for?