如何在android中查询Firestore并获取具体文档

implementation 'com.google.firebase:firebase-firestore:23.0.3'

FirebaseFirestore firestore = FirebaseFirestore.getInstance();

String collection = "your_collection";
String documentId = "your_document_id";

firestore.collection(collection).document(documentId).get()
        .addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
            @Override
            public void onSuccess(DocumentSnapshot documentSnapshot) {
                if (documentSnapshot.exists()) {
                    // 文档存在，可以获取文档数据
                    Map<String, Object> data = documentSnapshot.getData();
                    // 处理文档数据
                } else {
                    // 文档不存在
                }
            }
        })
        .addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                // 查询失败，处理异常
            }
        });

Map<String, Object> data = documentSnapshot.getData();
// 处理文档数据