我在做一个firebase项目。我使用itemtouchhelper从firebase数据库中拖动并重新排序recyclerview,但如果我输入另一个活动并恢复或重新启动应用程序,它会重置为原来的状态。有没有办法使对recyclerview订单的更改永久化?
ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.START | ItemTouchHelper.END, 0) {
@Override
public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
int fromPosition = viewHolder.getAdapterPosition();
int toPosition = target.getAdapterPosition();
Collections.swap(List, fromPosition, toPosition);
adapter.notifyItemMoved(fromPosition, toPosition);
return false;
}
@Override
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
}};
private void loadList() {
List = new ArrayList<>();
DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("List");
databaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
List.clear();
for(DataSnapshot ss: snapshot.getChildren()){
if(ss.child("moreList").child(ID).exists()){
ListModel model = ss.getValue(ListModel.class);
List.add(model);
}
}
adapter = new ListAdapter(getActivity(), List);
RecyclerView.setAdapter(adapter);
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
itemTouchHelper.attachToRecyclerView(RecyclerView);
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
暂无答案!
目前还没有任何答案,快来回答吧!