Firestore Java Android创建一个包含集合和嵌套文档的结构

implementation 'com.google.firebase:firebase-firestore:23.0.0'

FirebaseFirestore db = FirebaseFirestore.getInstance();

Map<String, Object> user = new HashMap<>();
user.put("name", "John Doe");
user.put("age", 25);

db.collection("users").document("user1")
    .set(user)
    .addOnSuccessListener(new OnSuccessListener<Void>() {
        @Override
        public void onSuccess(Void aVoid) {
            Log.d(TAG, "DocumentSnapshot successfully written!");
        }
    })
    .addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            Log.w(TAG, "Error writing document", e);
        }
    });

Map<String, Object> nestedData = new HashMap<>();
nestedData.put("field1", "value1");
nestedData.put("field2", "value2");

db.collection("users").document("user1")
    .collection("nestedCollection").document("nestedDoc")
    .set(nestedData)
    .addOnSuccessListener(new OnSuccessListener<Void>() {
        @Override
        public void onSuccess(Void aVoid) {
            Log.d(TAG, "Nested document successfully written!");
        }
    })
    .addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            Log.w(TAG, "Error writing nested document", e);
        }
    });