Firestore get DocumentSnapshot's field's value

Question

If I have a Firebase Firestore database which I have retrieved a DocumentSnapshot for the document corresponding to the collection on the right and stored in a

Answer 1

You need to do a DocumentReference to get the content in your document.

A simple one will be like this.

DocumentReference docRef = myDB.collection("users").document("username");
docRef.get().addOnCompleteListener(new OnCompleteListener() {
@Override
     public void onComplete(@NonNull Task task) {
          if (task.isSuccessful()) {
               DocumentSnapshot document = task.getResult();
                    if (document != null) {
                         Log.i("LOGGER","First "+document.getString("first"));
                         Log.i("LOGGER","Last "+document.getString("last"));
                         Log.i("LOGGER","Born "+document.getString("born"));
                    } else {
                         Log.d("LOGGER", "No such document");
                    }
               } else {
                    Log.d("LOGGER", "get failed with ", task.getException());
                }
          }
     });

The downside is that you need to know your document ID to get the field values.