When click on listview , delete it and delete associated data with it in firebase

Question

Hello and thanks for help I have asked here how to Polpulate listview from firebase and thankfully Krishna Kishan solved my problem but now what I like to do is when I click on

Answer 1

You have to modify some code that is outside the snippet you posted.

I guess your items are read from the database. When you read your "message" node you have to save keys as well as values. You can achieve this in a number of ways. e.g.

final ArrayList<String> keyList = new ArrayList<>();
final ArrayList<String> items = new ArrayList<>();
myRef.getRoot().child("messages")
        .addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for (DataSnapshot messages : dataSnapshot.getChildren()) {
            keyList.add(messages.getKey());
            items.add(messages.getValue(String.class));
        }
    }
    @Override
    public void onCancelled(DatabaseError databaseError) {
        /*handle errors*/
    }
});

Now you have both keys and values. Modify your OnClickListener this way:

listi.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        items.remove(position);
        adapt.notifyDataSetChanged();
        //new code below
        myRef.getRoot().child("message").child(keyList.get(position)).removeValue();
        keyList.remove(position);
    }
});

Obviously listi.setOnItemClickListener( ... ) should be called when both keyList and items are properly filled. Please notice that ValueEventListener is asynchronous.

Answer 2

I assume you are using push() to add those messages to the database. Since push() generates a time based id, the order of the elements in the list is chronological, meaning what was added later comes after what was added earlier. So, when you are push()-ing, get the key and maintain a list of the ids. Then, in your onClick, use the position parameter to get the id for the clicked item and delete it in the database. Here's an example:

List<String> ids; //update this list with ids as you push
..
//then in your onItemClick
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
  rootReference.child("messages").child(ids.get(position)).removeValue();
  //update any offline lists
}

Please note that this assumes you're also displaying the messages in your ListView in the same order as in your database.