How to retrieve the last document in a firebase collection. I would also like to get the document fields value

问题

How to retrieve the last document from a Cloud Firestore collection? I would also like to get the document fields value.

Here this the image below:

回答1:

How to retrieve the last document in a firebase collection?

To solve this, you need to use a query that should look like this:

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
Query query = rootRef.collection("High Volume")
    .orderBy("Time", Query.Direction.DESCENDING)
    .limit(1);
query.get().addOnCompleteListener(/* ... */);

This query will order the results according to the time property and will limit the results to one.

来源：https://stackoverflow.com/questions/52362292/how-to-retrieve-the-last-document-in-a-firebase-collection-i-would-also-like-to