JAVAlang.ClassCastException适配器强制转换到活动

Question

我有一个这样的函数

  private void goToSalesActList(View view) {
    CustomerActivity ca = (CustomerActivity)view.getTag();
    Intent intent = new Intent(this, SalesActListActivity.class);
    Bundle bundle = new Bundle();
    bundle.putParcelable(Const.OBJ_USER, user);
    bundle.putParcelable("CustomerListActivity", ca);
    intent.putExtras(bundle);
    startActivity(intent);
  }

我在那行有个错误，比如在blockquote

java.lang.ClassCast异常：com.kreators.nvmobile.dashboard.AdapterSalesAct$ViewHolder不能强制转换为com.kreators.nvmobile.dashboard.SalesActActActive$CustomActiveS

CustomerActivity ca = (CustomerActivity)view.getTag();

简单地说，我想把我的类函数CustomerActivity上的一些数据打包到intent SalesActListActivity，但我有这样的错误。有人能帮我吗？至少，这是我的CustomerActivity函数

static class CustomerActivity implements Parcelable {
public int id, qty, AROD, HAVE, Visit;
public String code, name, sales, salesname, target, amt, psi;

public CustomerActivity(JSONObject o) {
  try {
    id = o.getInt("CustId");
    code = o.getString("CustCode");
    name = o.getString("CustDesc");
    salesname = o.getString("Salesname");
    sales = o.getString("Sales");
    target = o.getString("SITarget");
    amt = o.getString("SIAmt");
    psi = o.getString("persenPSI");
    qty = o.getInt("SOQty");
    AROD= o.getInt("AROD");
    HAVE= o.getInt("HAVE");
    Visit= o.getInt("Visit");
  } catch (JSONException e) {}
}

protected CustomerActivity(Parcel in) {
  id = in.readInt();
  qty = in.readInt();
  code = in.readString();
  name = in.readString();
  salesname = in.readString();
  sales = in.readString();
  target = in.readString();
  amt = in.readString();
  psi = in.readString();
  AROD = in.readInt();
  HAVE = in.readInt();
  Visit = in.readInt();
}

public static final Creator<CustomerActivity> CREATOR = new Creator<CustomerActivity>() {
  @Override
  public CustomerActivity createFromParcel(Parcel in) {
    return new CustomerActivity(in);
  }

  @Override
  public CustomerActivity[] newArray(int size) {
    return new CustomerActivity[size];
  }
};

@Override
public int describeContents() {
  return 0;
}

@Override
public void writeToParcel(Parcel parcel, int i) {
  parcel.writeInt(id);
  parcel.writeInt(qty);
  parcel.writeString(code);
  parcel.writeString(name);
  parcel.writeString(salesname);
  parcel.writeString(sales);
  parcel.writeString(target);
  parcel.writeString(amt);
  parcel.writeString(psi);
  parcel.writeInt(AROD);
  parcel.writeInt(HAVE);
  parcel.writeInt(Visit);
}

}

java.lang.类异常：com.kreators.nvmobile.dashboard.AdapterSalesAct$ViewHolder不能被强制转换为com.kreators.nvmobile.dashboard.SalesActActActActivity.goToSalesActList（SalesActActivity.java:210）在com.kreators.nvmobile.dashboard.SalesActAcom.kreators.nvmobile.dashboard.SalesActActivity.access0美元（SalesActActivity.java:33）在com.kreators.nvmobile.dashboard.SalesActActive$1.on项目点击（SalesActActivity.java:256）在android.widget.AdapterView.perform项目点击（AdapterView.java:305）在android.widget.AbsListView.perform项目点击（AbsListView.java:1146）在android.widget.AbsListView$PerformClick.run（AbsListView. java： 3053）在android. netget。AbsListView3 Dollars. run（AbsListView. java： 3865）在android. os. Handler. handleCallback（Handler. java： 739）在android. os. Handler.调度消息（Handler. java： 95）在android. os. Looper. Loop（Looper. java： 135）在android. app. ActivityThread. main（ActivityThread. java： 5345）在java. lang. reect。方法。调用（本机方法）在java. lang. reect。方法。调用（方法。java： 372）在com. android. interal. os。ZygoteInit$MEodAndArgsCaller. run（ZygoteInit. java： 947）在com. android. interal. os。ZygoteInit. main（ZygoteInit. java： 742）

那是我的错误信息

对不起，我的语法不好，我是新手谢谢

Answer 1

以下错误：

java.lang.ClassCastException: com.kreators.nvmobile.dashboard.AdapterSalesAct$ViewHolder cannot be cast to com.kreators.nvmobile.dashboard.SalesActActivity$CustomerActivity

是因为您试图将ViewHolder强制转换为CustomerActivity对象：

private void goToSalesActList(View view) {
  CustomerActivity ca = (CustomerActivity)view.getTag();
  ...
}

从你的评论来看：

当我单击列表视图时，我将该标记设置为“读取到下一个意图”

您需要将setTag对象设置为单击的项目视图，如下所示：

// selected item view
View view;
...
CustomerActivity selectedItem;
...
view.setTag(selectedItem);

// Then you can call the method with item
goToSalesActList(view);

上面的代码只是一个伪代码，因为如果没有适配器类代码，我无法确定你在做什么。

旁注：
您需要遵循Android项目的命名约定。例如，不鼓励对pojo使用CustomerActivity名称，因为Android开发者通常认为每个以Activity结尾的类名都是一个活动

Answer 2

代替

CustomerActivity ca = (CustomerActivity)view.getTag();

具有

CustomerActivity ca = (CustomerActivity)view.getContext();

在Android中，每个视图实例一旦创建，就可以访问它的上下文，在大多数情况下，*这将是一个活动。

*有时这将是Application或Context的另一个实现。