To ensure that the LazyColumn and mutable list are updated when an item is deleted using the SwipeToDismiss feature in Android Studio, follow these steps:
Implement the SwipeToDismissCallback
in your RecyclerView adapter that defines the behavior when an item is swiped to be dismissed.
In the onSwiped
method of the SwipeToDismissCallback
, remove the corresponding item from the mutable list.
Call the submitList
method on the adapter with the updated list.
In the activity that contains the RecyclerView, observe the mutable list in your ViewModel and update the LazyColumn accordingly.
Here's an example implementation of the SwipeToDismissCallback
:
class MyAdapter(private var myDataList: MutableList<MyData>) : RecyclerView.Adapter<MyAdapter.ViewHolder>(), SwipeToDismissCallback {
// ...
override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
val position = viewHolder.adapterPosition
myDataList.removeAt(position)
notifyItemRemoved(position)
}
// ...
}
And here's an example on how to observe the mutable list in your ViewModel:
class MyViewModel : ViewModel() {
private val _myDataList = MutableLiveData<List<MyData>>()
val myDataList: LiveData<List<MyData>> get() = _myDataList
init {
// initialize myDataList
}
fun removeItemAt(position: Int) {
val currentList = _myDataList.value.orEmpty().toMutableList()
currentList.removeAt(position)
_myDataList.value = currentList
}
}
Note that the removeItemAt
method is called from the onSwiped
method of the adapter.
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Asked: 2022-09-07 11:00:00 +0000
Seen: 12 times
Last updated: Apr 12 '21