// Obtiene e inicializa las vistas.
private void initVistas(View v) {
lblNuevoAlumno = (TextView) v.findViewById(R.id.lblNuevoAlumno);
lblNuevoAlumno.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
listener.onAgregarAlumno();
}
});
RecyclerView lstAlumnos = (RecyclerView) v.findViewById(R.id.lstAlumnos);
lstAlumnos.setHasFixedSize(true);
Firebase ref = new Firebase(App.getUidAlumnosUrl());
mAdaptador = new AlumnosAdapter(ref.orderByChild("nombre"));
mAdaptador.setOnItemClickListener(this);
mAdaptador.setOnItemLongClickListener(this);
mObservador =
new RecyclerView.AdapterDataObserver() {
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
super.onItemRangeInserted(positionStart, itemCount);
lblNuevoAlumno.setVisibility(mAdaptador.isEmpty() ? View.VISIBLE : View.INVISIBLE);
}
@Override
public void onItemRangeRemoved(int positionStart, int itemCount) {
super.onItemRangeRemoved(positionStart, itemCount);
lblNuevoAlumno.setVisibility(mAdaptador.isEmpty() ? View.VISIBLE : View.INVISIBLE);
}
@Override
public void onChanged() {
super.onChanged();
lblNuevoAlumno.setVisibility(mAdaptador.isEmpty() ? View.VISIBLE : View.INVISIBLE);
}
};
mAdaptador.registerAdapterDataObserver(mObservador);
lstAlumnos.setAdapter(mAdaptador);
mLayoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
lstAlumnos.setLayoutManager(mLayoutManager);
lstAlumnos.addItemDecoration(
new DividerItemDecoration(getActivity(), LinearLayoutManager.VERTICAL));
lstAlumnos.setItemAnimator(new DefaultItemAnimator());
// Drag & drop y Swipe to dismiss.
ItemTouchHelper itemTouchHelper =
new ItemTouchHelper(
new ItemTouchHelper.SimpleCallback(
ItemTouchHelper.UP | ItemTouchHelper.DOWN, ItemTouchHelper.RIGHT) {
@Override
public boolean onMove(
RecyclerView recyclerView,
RecyclerView.ViewHolder viewHolder,
RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
// Se elimina el elemento.
eliminarAlumno(viewHolder.getAdapterPosition());
}
});
itemTouchHelper.attachToRecyclerView(lstAlumnos);
// Hide / show FAB on scrolling.
mHidingScrollListener =
new HidingScrollListener() {
@Override
public void onHide() {
listener.onHideFAB();
}
@Override
public void onShow() {
listener.onShowFAB();
}
};
lstAlumnos.addOnScrollListener(mHidingScrollListener);
}
