My problem is that if I try to delete an item on my ListView
, all the data will be deleted to on both listview and my firebase realtime database. All I want is, if I long click an item, only that item will be removed, not all of them on the ListView
. Thank you. Any help is appreciated
This is what I declare:
MatkulAdapter matkulAdapter = null;
Matkul matkul;
DatabaseReference root = FirebaseDatabase.getInstance().getReference();
DatabaseReference dbReference = root.child("MataKuliah");
This is the code to delete an item:
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
Matkul item = matkulAdapter.getItem(position);
matkulAdapter.remove(item);
dbReference.removeValue();
matkulAdapter.notifyDataSetChanged();
return true;
}
});
This is my database:
EDIT QUESTION
and also i tried this code with.child but the data only deleted on ListView. So the data comes back when i re-open the ListView.
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
Matkul item = matkulAdapter.getItem(position);
matkulAdapter.remove(item);
dbReference.child(item.getNamaMatkul()).removeValue();
matkulAdapter.notifyDataSetChanged();
When you are using the following line of code:
dbReference.removeValue();
Everything beneath MataKuliah
will be deleted. If only need to remove the 1595588052231
child, then simply use the following line of code:
dbReference.child("1595588052231").removeValue();
A better approach might be to store the 1595588052231
as a value of a uid
property in your database and then use:
dbReference.child(item.getUid()).removeValue();
you need pass your firebase item id (15955880552231) in second child, like this code:
Query query = rdbReference.orderByChild("namaMatkul").equalTo(item.namaMatkul);
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot itemSnapshot: dataSnapshot.getChildren()) {
appleSnapshot.getRef().removeValue();
matkulAdapter.remove(item);
matkulAdapter.notifyDataSetChanged();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
Log.e(TAG, "onCancelled", databaseError.toException());
}});
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