尝试在Android中复制不同列表中的对象
尝试在Android中复制不同列表中的对象
提问于 2015-06-26 12:44:33
我正在一个带有领域的Android应用程序中工作，当我试图管理不同列表中的对象(商店购物车和产品网格)时，我遇到了一个问题。在Products Grid中，我显示从服务器解析的产品，然后将这些产品拖放到购物车上，创建要购买的产品列表。
当我对一个对象使用"copyToRealm“方法并试图在其中一个列表中修改它时，这两个列表的对象也会被修改。
我试图在添加到这两个列表之前复制，但是对象似乎总是相同的。
按部件划分我的代码：
1.解析来自服务器的产品的方法：
/**
* Parse products got from server
* @param result
*/
public static void parseProducts(Realm realm, String result){
Logs.MessageLogs("parseProducts", result, "v", Global.SHOW_LOGS);
Object product = null;
JSONObject json = null;
ProductRealm pRealm, pObject;
try {
json = new JSONObject(result);
if(Global.USER_LOGGED.getProductsGrid().size() > 0)
_CRUDDatabase.clearProductsGrid(realm);
for (Iterator<?> iterator = json.keys(); iterator.hasNext(); ) {
String key = (String) iterator.next();
if (json.get(key) instanceof JSONObject) { //Category with children
product = ((JSONObject) json.get(key));
realm.beginTransaction();
pObject = realm.createObject(ProductRealm.class);
pRealm = _CRUDDatabase.createNewProduct(Global.PREVIOUS_CATEGORY.getId(), product);
pObject = realm.copyToRealm(pRealm); //copy value to Realm
Global.USER_LOGGED.getProductsGrid().add(pObject); //add value to RealmList
realm.commitTransaction();
}
}
} catch (JSONException e) {
e.printStackTrace();
} catch (Exception ex){
ex.printStackTrace();
}
}2.在产品网格中显示产品的方法：
private void initializeGridView(View view){
// int width = Utility.getScreenDimension((Activity) getActivity(), "WIDTH");
mGridView = (RecyclerView) view.findViewById(R.id.RecyclerView);
mGridView.setHasFixedSize(true);
mShopGridViewAdapter = new ShopGridViewAdapter(getActivity(), productList);
mShopGridViewAdapter.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i("Item", "Clicked on item: " + mGridView.getChildAdapterPosition(v));
ProductRealm pRealm = productList.get(mGridView.getChildAdapterPosition(v));
UtilityDB.resetValuesToDefault(Global.REALM, pRealm);
openProductDetailFragment(fm, pRealm);
}
});
mGridView.setAdapter(mShopGridViewAdapter);
mGridView.setLayoutManager(new GridLayoutManager(getActivity(), 2, GridLayoutManager.HORIZONTAL, false));
//Item Decoration
mGridView.setItemAnimator(new DefaultItemAnimator());
}3.捕捉拖放购物车上的侦听器：
public class ShoppingCartDragListener implements View.OnDragListener {
...
private void checkTypeOfDraggedProduct(ProductRealm pRealm) {
ShopGridViewFragment sgv;
if(pRealm.getTypeId().equals(TAG_CONFIGURABLE)){ //Configurable product
sgv = new ShopGridViewFragment();
sgv.openProductDetailFragment(fm, pRealm);
} else { //Simple product
pRealm.setQuantity(1); //Only increment 1 unit when drag to shopping cart
int pos = _CRUDDatabase.addNewProductToCart(Global.REALM, pRealm);
shoppingCartAdapter.notifyItemInserted(pos);
ShoppingCartFragment.updateStatusCart();
}
}
...
}4.向购物车添加新产品的方法：
/**
* Add new product to Shopping Cart from single productItem
* @param realm
* @param pObject
* @return
*/
public static int addNewProductToCart(Realm realm, ProductRealm pObject) {
int pos = -1;
ProductRealm pRealmDatabase = readProductFromDatabase(realm, pObject.getEntityId());
realm.beginTransaction();
if(pRealmDatabase != null){ //Update product in shopping cart
pos = UtilityDB.getProductPositionIntoCart(pObject);
if(pos != -1) {
Global.USER_LOGGED.getCart().getProducts().get(pos).setQuantity(pObject.getQuantity() + pRealmDatabase.getQuantity());
Global.USER_LOGGED.getCart().getProducts().get(pos).setQuantityWeight(pObject.getQuantityWeight() + pRealmDatabase.getQuantityWeight());
}
} else { //Add new product to cart
//ProductRealm pRealm = realm.copyToRealm(pObject);
pObject.setIsIntoShoppingCart(true);
Global.USER_LOGGED.getCart().getProducts().add(pObject);
}
Global.USER_LOGGED.getCart().setLastUpdate(Utility.getCurrentDateTime());
realm.commitTransaction();
return pos;
}5.这是我的模型：
@RealmClass
public class UserRealm extends RealmObject implements Serializable {
private String email;
private String password;
private String tokenId;
private String tokenSecret;
private String creationDate;
private RealmList<ProductRealm> productsGrid; //Temp table to load category products
private CartRealm cart; //One-to-one relationship
...
}
@RealmClass
public class CartRealm extends RealmObject implements Serializable {
private String creationDate;
private String lastUpdate;
private int totalDinitos;
private float totalPrice;
private RealmList<ProductRealm> products;
...
}
@RealmClass
public class ProductRealm extends RealmObject implements Serializable {
private String catId; //Only one category per product. In generic case many category per product
private String entityId;
private String parentId;
private String typeId;
private String sku;
private String canaryProduct;
private String premium;
private String brand;
private String dinitosQty;
private String name;
private String ean;
private String description;
private String shortDescription;
private String attributeSet;
private String weight;
private String isSaleable;
private String imageUrl;
private String unit;
private String unitFresh;
private String childrenSelected;
private float price;
private float minWeight;
private float quantityWeight;
private int quantity;
private int stock;
private int typeOfAttribute; //0: Per units | 1: Per weight
private boolean isIntoShoppingCart; //Flag to indicate if the product is into the Shopping Cart
private RealmList<AttributeRealm> attributeItems;
private RealmList<ProductRealm> children;
...
}问题是，当我在购物车中删除一个产品时，我也要在product中删除这个对象:(我希望处理两个列表中的不同实例。
copyToRealm方法究竟是如何工作的？我真的在处理这个物体的副本吗？
我希望你能帮我:)提前谢谢
回答 1
Stack Overflow用户
回答已采纳
发布于 2015-06-26 14:03:42
我解决了我的问题。当我将产品从product添加到购物车时，我需要在添加它之前使用"createObject“。
ProductRealm pRealm = Global.REALM.createObject(ProductRealm.class);我的失败:)
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/31073513
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