如何使用匿名身份验证将数据保存到android中的Firestore数据库？

// 引入Firestore库
implementation 'com.google.firebase:firebase-firestore:23.0.0'

// 初始化Firestore
FirebaseFirestore firestore = FirebaseFirestore.getInstance();

// 匿名登录
FirebaseAuth.getInstance().signInAnonymously()
        .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()) {
                    // 登录成功，保存数据
                    DocumentReference docRef = firestore.collection("collectionName").document("documentId");
                    Map<String, Object> data = new HashMap<>();
                    data.put("key", "value");

                    docRef.set(data)
                            .addOnSuccessListener(new OnSuccessListener<Void>() {
                                @Override
                                public void onSuccess(Void aVoid) {
                                    // 数据保存成功
                                }
                            })
                            .addOnFailureListener(new OnFailureListener() {
                                @Override
                                public void onFailure(@NonNull Exception e) {
                                    // 数据保存失败
                                }
                            });
                } else {
                    // 登录失败
                }
            }
        });