how to change LiveData observable query parameter with room database in android?

I suggest you to to use viewModel. I did the query and observe changes using MutableLiveData. First step

val mutableBusCategory: MutableLiveData<String> = MutableLiveData()

Setter for mutablelivedata

fun searchByCategory(param: String) {
    mutableBusCategory.value = param
}

observable to observe the change

val busObservable: LiveData<Bus> = Transformations.switchMap(mutableBusCategory) { param->
    repository.getLiveBuses(param)
}

and final step to observe the live data

 busObservable.observe(this, Observer {
        //your logic for list})

and to trigger mutablelivedata

searchByCategory(//categoryName)

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