📅  最后修改于: 2022-03-11 14:56:26.258000             🧑  作者: Mango
FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
DocumentReference docIdRef = rootRef.collection("yourCollection").document(docId);
docIdRef.get().addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()) {
DocumentSnapshot document = task.getResult();
if (document.exists()) {
Log.d(TAG, "Document exists!");
} else {
Log.d(TAG, "Document does not exist!");
}
} else {
Log.d(TAG, "Failed with: ", task.getException());
}
}
});