我正在开发商店应用。有一个RecyclerView，显示添加到购物车中的物品。每个项目都有一个复选框。选中复选框后，该项目应添加到Firestore。到现在为止，这有效。但是不起作用的是，如果未选中该复选框，则用户不想使用该项目下订单，则应从Firestore中删除该文档，而不是这种情况。
这是代码：
holder.cartCheckBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
int adapterPosition = holder.getAdapterPosition();
if (firebaseUser != null) {
userID = firebaseUser.getUid();
char[] chars1 = "0123456789".toCharArray();
StringBuilder stringBuilder = new StringBuilder();
Random random = new Random();
for (int i = 0; i < 16; i++) {
char c1 = chars1[random.nextInt(chars1.length)];
stringBuilder.append(c1);
}
final String order_id = stringBuilder.toString();
final DocumentReference priceDocument = firebaseFirestore.collection("Shopping Cart").document(userID).collection("Total Amount").document("price");
if (!itemStateArray.get(adapterPosition, false)) {
holder.cartCheckBox.setChecked(true);
itemStateArray.put(adapterPosition, true);
// Toast.makeText(context, "You selected: " + cartItemID + " " + "(" + name + ")", Toast.LENGTH_LONG).show();
priceDocument.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if (task.isSuccessful()) {
DocumentSnapshot documentSnapshot = task.getResult();
if (documentSnapshot.exists()) {
String oldPrice = task.getResult().getString("price");
int priceInteger = Integer.parseInt(price) + Integer.parseInt(oldPrice);
String finalPrice = Integer.toString(priceInteger);
myCallback.priceListenerMethod(finalPrice);
Map<String, Object> priceMap = new HashMap<>();
priceMap.put("price", finalPrice);
priceDocument.set(priceMap);
/*
orderCallBack.orderListenerMethod("image_url: " + image_url);
orderCallBack.orderListenerMethod("name: " + name);
orderCallBack.orderListenerMethod("size: " + size);
orderCallBack.orderListenerMethod("price_checked: " + price);
orderCallBack.orderListenerMethod("final_price_checked: " + finalPrice);
*/
Map<String, Object> orderMap = new HashMap<>();
orderMap.put("image", image_url);
orderMap.put("name", name);
orderMap.put("size", size);
orderMap.put("color", color);
orderMap.put("price", price);
orderMap.put("total", finalPrice);
firebaseFirestore.collection("Orders").document(userID).collection("Order ID").document(order_id).set(orderMap, SetOptions.merge());
} else {
Map<String, Object> priceMap = new HashMap<>();
priceMap.put("price", price);
myCallback.priceListenerMethod(price);
priceDocument.set(priceMap);
Map<String, Object> orderMap = new HashMap<>();
orderMap.put("image", image_url);
orderMap.put("name", name);
orderMap.put("size", size);
orderMap.put("color", color);
orderMap.put("price", price);
firebaseFirestore.collection("Orders").document(userID).collection("Order ID").document(order_id).set(orderMap);
}
}
}
});
} else {
holder.cartCheckBox.setChecked(false);
itemStateArray.put(adapterPosition, false);
priceDocument.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
@Override
public void onComplete(@NonNull Task<DocumentSnapshot> task) {
if (task.isSuccessful()) {
DocumentSnapshot documentSnapshot = task.getResult();
if (documentSnapshot.exists()) {
String oldPrice = task.getResult().getString("price");
int priceInteger = Integer.parseInt(oldPrice) - Integer.parseInt(price);
String finalPrice = Integer.toString(priceInteger);
myCallback.priceListenerMethod(finalPrice);
Map<String, Object> priceMap = new HashMap<>();
priceMap.put("price", finalPrice);
priceDocument.set(priceMap);
/*
Map<String, Object> orderMap = new HashMap<>();
orderMap.put("image", image_url);
orderMap.put("name", name);
orderMap.put("size", size);
orderMap.put("color", color);
orderMap.put("price", price);
orderMap.put("total", finalPrice);
*/
// firebaseFirestore.collection("Orders").document(userID).collection("Order ID").document(order_id).delete();
/*
orderCallBack.orderListenerMethod("image_url: " + image_url);
orderCallBack.orderListenerMethod("name: " + name);
orderCallBack.orderListenerMethod("size: " + size);
orderCallBack.orderListenerMethod("color: " + color);
orderCallBack.orderListenerMethod("price_UNchecked: " + price);
orderCallBack.orderListenerMethod("final_price_UNchecked: " + finalPrice);
*/
} else {
firebaseFirestore.collection("Orders").document(userID).collection("Order ID").document(order_id).delete();
Toast.makeText(context, order_id + " removed", Toast.LENGTH_SHORT).show();
}
}
}
});
}
}
}
});
您会注意到我正在使用回调。我尝试使用它来将项目数据发送到该适配器的活动。但是我不知道如何。
请帮忙吗？