public void offlineListen()

in firestore/app/src/main/java/com/google/example/firestore/DocSnippets.java [1293:1318]

• 21 lines of code
• 5 McCabe index (conditional complexity)

    public void offlineListen(FirebaseFirestore db) {
        // [START offline_listen]
        db.collection("cities").whereEqualTo("state", "CA")
                .addSnapshotListener(MetadataChanges.INCLUDE, new EventListener<QuerySnapshot>() {
                    @Override
                    public void onEvent(@Nullable QuerySnapshot querySnapshot,
                                        @Nullable FirebaseFirestoreException e) {
                        if (e != null) {
                            Log.w(TAG, "Listen error", e);
                            return;
                        }

                        for (DocumentChange change : querySnapshot.getDocumentChanges()) {
                            if (change.getType() == Type.ADDED) {
                                Log.d(TAG, "New city:" + change.getDocument().getData());
                            }

                            String source = querySnapshot.getMetadata().isFromCache() ?
                                    "local cache" : "server";
                            Log.d(TAG, "Data fetched from " + source);
                        }

                    }
                });
        // [END offline_listen]
    }