So I'm testing the Recycler View and facing some troubles when adding new item.
I have a RecyclerView where I try to display a user's contacts, but when I create a new elemen, all the contacts duplicate. I know that I should clean my view before adding new data, but I'm not sure how to do that.
Here's my main activity code
for (DataSnapshot postSnapshot : snapshot.child(currentUser.getUid()).getChildren()) {
Document document = postSnapshot.getValue(Document.class);
mDocuments.add(document);
}
adapter = new ContactAdapter(getApplicationContext(), mContacts, mAuth);
recyclerView.setAdapter(adapter);
Here's adaptor
@Override
public void onBindViewHolder(@NonNull ContactViewHolder holder, int position) {
Contact contactCurrent = mContacts.get(position);
holder.contactName.setText("Name: " contactCurrent.getName());
holder.contactPhone.setText("Phone number: " contactCurrent.getPhone());
}
public static class ContactViewHolder extends RecyclerView.ViewHolder {
public TextView contactName, contactPhone;
public ImageButton deleteContact;
public ContactViewHolder(@NonNull View itemView) {
super(itemView);
contactName = itemView.findViewById(R.id.contact_name);
contactPhone = itemView.findViewById(R.id.contact_phone);
deleteContact = itemView.findViewById(R.id.delete_contact);
}
}
CodePudding user response:
Ohk, just use mDocuments.clear();
before adding data to mDocuments
. See below code.
for (DataSnapshot postSnapshot : snapshot.child(currentUser.getUid()).getChildren()) {
mDocuments.clear();
Document document = postSnapshot.getValue(Document.class);
mDocuments.add(document);
}
adapter = new ContactAdapter(getApplicationContext(), mContacts, mAuth);
recyclerView.setAdapter(adapter);