Question

我有这样的功能

  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);
  }

我在该行的blockquote上有一个错误

java.lang.ClassCastException：com.kreators.nvmobile.dashboard.AdapterSalesAct $ ViewHolder无法强制转换为com.kreators.nvmobile.dashboard.SalesActActivity $ CustomerActivity

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

简单地说，我想将我的类函数CustomerActivity上的一些数据分配给intentActListActivity，但我有这样的错误。谁能帮我？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.ClassCastException：com.kreators.nvmobile.dashboard.AdapterSalesAct $ ViewHolder无法强制转换为com.kreators.nvmobile.dashboard.SalesActActivity $ CustomerActivity 在com.kreators.nvmobile.dashboard.SalesActActivity.goToSalesActList（SalesActActivity.java:210）在com.kreators.nvmobile.dashboard.SalesActActivity.access $ 000（SalesActActivity.java:33）在com.kreators.nvmobile.dashboard.SalesActActivity $ 1.onItemClick（SalesActActivity.java:256）在android.widget.AdapterView.performItemClick（AdapterView.java:305）在android.widget.AbsListView.performItemClick（AbsListView.java:1146）在android.widget.AbsListView $ PerformClick.run（AbsListView.java:3053）在android.widget.AbsListView $ 3.run（AbsListView.java:3865）在android.os.Handler.handleCallback（Handler.java:739）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:135）在android.app.ActivityThread.main（ActivityThread.java:5345） at java.lang.reflect.Method.invoke（Native Method）在java.lang.reflect.Method.invoke（Method.java:372）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:947）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:742）

这是我的错误消息

抱歉，我的语法很糟糕，我是新手谢谢

Answer 1

替换

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

与

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

在Android中，每个View个实例一旦创建，就可以访问Context，在大多数情况下*会是Activity。

*有时这将是Application或Context的其他实现。

Answer 2

以下错误：

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

发生了

因为你正试图将ViewHolder强制转换为CustomerActivity对象：

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

发表评论：

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

你需要使用setTag将对象设置为你点击的项目视图：

// 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，因为如果不提供适配器类代码，我就无法确定您的代码。

旁注：
您需要遵循Android项目的命名约定。例如，对于pojo使用CustomerActivity名称是不鼓励的，因为Android开发人员通常认为以Activity结尾的每个类名都是Activity

java.lang.ClassCastException转换为Activity的适配器

2 个答案: