如何在Android中从Cloud Firestore Firebase获取或获取数据

假设您name在每个用户对象下都有一个属性，要解决此问题，请使用以下代码：

DocumentReference docRef = db.collection("Users").document("user_01");
docRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
    @Override
    public void onComplete(@NonNull Task<DocumentSnapshot> task) {
        if (task.isSuccessful()) {
            DocumentSnapshot document = task.getResult();
            if (document != null && document.exists()) {
                Log.d("TAG", document.getString("name")); //Print the name
            } else {
                Log.d(TAG, "No such document");
            }
        } else {
            Log.d(TAG, "get failed with ", task.getException());
        }
    }
});