groovy implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.4.0' kotlin fun <X, Y> LiveData<X>.switchMap(func: (X) -> LiveData<Y>): LiveData<Y> { val result = MediatorLiveData<Y>() result.addSource(this) { x -> val newLiveData = func(x) result.removeSource(this) result.addSource(newLiveData) { y -> result.value = y } } return result } kotlin val inputLiveData = MutableLiveData<String>() val transformedLiveData = inputLiveData.switchMap { input -> Transformations.map(inputLiveData) { data -> } }