In order to enable cross platform augmented reality experiences, web technologies were chosen. The application flow is usually that the ArchtiectView is initialised and displayed by the native application. An AR experience is loaded which consists of an html file that executes javascript functions to create the objects in AR.
callJavascript method is used natively to communicate with the loaded AR exprience. It executes the passed javascript in the context of the loaded AR experience. Therefore it can be used to pass POI data as json to a function declared in the Javascript part.
There is an error in the posted java code
architectView.callJavascript(newData('" + poiDataAsJson +")')
should include 2 more double quotes
architectView.callJavascript("newData('" + poiDataAsJson +")'")
This executes the function newData
declared globally in javascript and passes 1 parameter, the json encoded poi data.
Disclaimer: I work for Wikitude