我的片段包含一个ChipGroup，并chips根据用户选择动态添加。我希望完成的是一个适配器模式，其中alist暴露于chips正在创建的适配器中，用户可以在列表中添加元素或从列表中删除元素。
我找不到任何办法，现在，每当用户与vist进行交互时，都会重新创建所有筹码。
为了简洁起见，代码已被裁剪
XML文件
// capturing the user's choice
<RadioGroup
android:id="@+id/vehicles_radio_group"
android:onCheckedChanged="@{vehicleViewModel::radioCheckedChanged}">
视图模型
fun radioCheckedChanged(radioGroup: RadioGroup, checkedId: Int) {
//validating the user's choice
if (condition) {
//code for adding the choice to a List
vehicleDispatched(selectedVehicle, checkedId)
} else {
selectionError()
}
}
// adding the user's choice to the list
// _dispatchingUnits is a LiveData
private fun vehicleDispatched(selectedVehicle: DomainVehicle, checkedId: Int) {
// appending the selected choice to the list(Type : List<Pair<Vehicle,Planet>>)
_dispatchingUnits.value =
_dispatchingUnits.value?.plus(selectedVehicle to _currentPlanet.value!!)
?: listOf(selectedVehicle to _currentPlanet.value!!)
}
分段
// register an observer and take action
myViewModel.dispatchingUnits.observe(viewLifecycleOwner) { allPairs ->
allPairs?.apply {
with(binding) {
// remove the existing chips if any
if (selectedPairChipGroup.isNotEmpty()) {
selectedPairChipGroup.removeAllViews()
}
// create new chips
allPairs.forEach { chipPair ->
createChips(chipPair)
}
}
}
}
期待这样的事情，
// In fragment class
val adapter = ChipAdapter()
binding.chipGroup.setAdapter(adapter)
// In bindingUtils file
@BindingAdapter("fill_data")
fun RecyclerChipGroup.setData(list : MyListType){
val adapter = this.adapter as ChipAdapter
adapter.submitChipList(list)
}
//XML File
<RecyclerChipGroup
....
app:fill_data = "@{viewModel.dispatchingUnits}"
....
/>
怎么继续呢？
