我点了没反应是不是跟这个mContext为null有关
我的CartProvider类
public class CartProvider {
public static final String JSON_CART = "json_cart";
private Context mContext;
//优化过的HashMap集合
private SparseArray datas;
private static CartProvider cartProvider;
private CartProvider(Context mContext) {
this.mContext = mContext;
datas = new SparseArray(100);
listToSparse();
}
public static CartProvider getInstance() {
if (cartProvider == null) {
cartProvider = new CartProvider(MyApplication.getContext());
}
return cartProvider;
}
private void listToSparse() {
List carts = getAllData();
//放到sparseArry中
if (carts != null && carts.size() > 0) {
for (int i = 0; i < carts.size(); i++) {
GoodsBean goodsBean = carts.get(i);
datas.put(Integer.parseInt(goodsBean.getProduct_id()), goodsBean);
}
}
}
private List parsesToList() {
List carts = new ArrayList();
if (datas != null && datas.size() > 0) {
for (int i = 0; i < datas.size(); i++) {
GoodsBean shoppingCart = datas.valueAt(i);
carts.add(shoppingCart);
}
}
return carts;
}
public List getAllData() {
return getDataFromLocal();
}
//本地获取json数据，并且通过Gson解析成list列表数据
public List getDataFromLocal() {
List carts = new ArrayList();
//从本地获取缓存数据
String saveJson = CacheUtils.getString(mContext, JSON_CART);
if (!TextUtils.isEmpty(saveJson)) {
//把数据转换成列表
carts = new Gson().fromJson(saveJson, new TypeToken() {}.getType());
}
return carts;
}
public void addData(GoodsBean cart) {
//添加数据
GoodsBean tempCart = datas.get(Integer.parseInt(cart.getProduct_id()));
if (tempCart != null) {
tempCart.setNumber(tempCart.getNumber() + cart.getNumber());
} else {
tempCart = cart;
tempCart.setNumber(cart.getNumber());
}
datas.put(Integer.parseInt(tempCart.getProduct_id()), tempCart);
commit();//保存数据
}
//保存数据
private void commit() {
//把parseArray转换成list
List carts = parsesToList();
//把转换成String
String json = new Gson().toJson(carts);
// 保存
CacheUtils.putString(mContext, JSON_CART, json);
}
public void deleteData(GoodsBean cart) {
//删除数据
datas.delete(Integer.parseInt(cart.getProduct_id()));
//保存数据
commit();
}
public void updataData(GoodsBean cart) {
//修改数据
datas.put(Integer.parseInt(cart.getProduct_id()), cart);
//保存数据
commit();
}
/**
* 根据Key查找书籍
*
* @param goods_bean
* @return
*/
public GoodsBean findData(GoodsBean goods_bean) {
GoodsBean goodsBean = datas.get(Integer.parseInt(goods_bean.getProduct_id()));
if (goodsBean != null) {
return goods_bean;
}
return null;
}
} |
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