Hi, I found a little problem with Android ICallBack and fat `module.exports` args. For example If I load this code:
```auto
var stores = Observable({
"id": 4,
"name": "Cycling Shop",
"description": "La mas destacada tienda de ciclismo, con venta de repuestos y refacciones",
"profile_image": "http://mydomain,com/img/stores/rueda-libre.jpg",
"cover_image": "http://mydomain,com/img/stores/rueda-libre-bk.jpg",
"category_image": "http://mydomain,com/img/categories/tiendas.png",
"geo_lat": 22.156017,
"geo_lng": -101.003913,
"rating": 3,
"followed": 9
}, {
"id": 57,
"name": "Samba Smoothie",
"description": "¡Productos naturales, nutritivos y especialmente balanceados para tus actividades diarias!",
"profile_image": "http://mydomain.com/dynamic/branches/samba-smoothie/profile-image-57.jpg",
"cover_image": "http://mydomain.com/dynamic/branches/samba-smoothie/cover-image-57.jpg",
"category_image": "http://mydomain.com/img/categories/restaurantes.png",
"geo_lat": 22.1478936,
"geo_lng": -101.0260151,
"rating": 0,
"followed": 2
}
// ... and more and more stores
);
}
module.exports = {
stores : stores
};
```
Setting the ICallback from Java I get all the `module.exports` context and it’s painfully slow to trigger the event `openStore`. The problem is with key “data” of the hashMap(it could be a really long string). Is it possible via Java to hide the `data`key? 🙂
---
Hi!
Thanks for reporting this issue. We have changed the API for callbacks to lazily load the arguments. The string in the `data` key is the datacontext from the callsite in UX. Since you are calling out to native code, fuse has to serialize all the data, which can be slow if you have lots of data on the datacontext. In commoncase you dont care about the arguments, but only for the callback itself.
The new API will look like this in Java:
```auto
ViewHandle view = ...;
view.setCallback("buttonClicked", new ICallback() {
@Override
public void invoke(IEventRecord eventRecord) {
// args is whatever described in https://www.fusetools.com/docs/scripting/scripting#binding-functions
HashMap args = eventRecord.getArgs();
// data is the datacontext serialized to a JSON string
String data = eventRecord.getDataJson();
}
});
```
The serialization will only happen if you call the get methods on `eventRecord`.
---