随机化 LiveData <list<names></list<names>

Question

How can I randomize a LiveData<list<StudentEntity>> in a ViewModel and display the results in my RecyclerView ? I was thinking I could do a

Collection.shuffle(Arrays.asList(myList))

but I don't believe this changes the order of the objects in the LiveDatalist.

MyFragment

....
public void RandomizeListOrder() {
    mMainActivityViewModel.setRandomOrder();
    adapter.notifyDataSetChanged();
}

ViewModel

private LiveData<List<StudentEntity>> mStudentList

public void setRandomOrder() {
    Collection.shuffle(Arrays.asList(mStudentList));
}

Answer 1

You can manipulate livedata using livedata transformations.

val transformedLiveData = Transformations.map(
                yourActualLiveData) { //Shuffle logic here }

Answer 2

Well if you are interested in Kotlin solution you could do it like this:

val mStudentList = MutableLiveData<List<StudentEntity>>()

fun setRandomOrder() {
    mStudentList.value?.let { students ->
        mStudentList.value = students.shuffled()
    }
}