Android implement search with view model and live data

Question

I\'m working on a project in android for a udacity course I\'m currently trying to implement a search function while adhering to android architecture components and using fi

Answer 1

I implement the bar code searching product using the following approach.
Everytime the value of productBarCode changes, the product will be searched in the room db.

@AppScoped
class PosMainViewModel @Inject constructor(
var localProductRepository: LocalProductRepository) : ViewModel() {

val productBarCode: MutableLiveData = MutableLiveData()

val product: LiveData = Transformations.switchMap(productBarCode) { barcode ->
    localProductRepository.getProductByBarCode(barcode)
}

init {
    productBarCode.value = ""
}

fun search(barcode: String) {
    productBarCode.value = barcode
}}

In activity

posViewModel.product.observe(this, Observer {
        if (it == null) {
           // not found
        } else {
            productList.add(it)
            rvProductList.adapter!!.notifyDataSetChanged()
        }
    })

for searching

posViewModel.search(barcode) //search param or barcode