Question

我正在开发一个包含可扩展列表视图的应用程序，前两个级别工作正常，但是我想添加第三个级别，我设法通过在项目布局的末尾添加一个列表视图来做到这一点，如下所示：

<?xml version="1.0" encoding = "utf-8"?>
<LinearLayout
 ...">

    <RelativeLayout
     ...">

        <ImageView
            android:id="@+id/delete_order_customer"
            ... />

        <TextView
            android:id="@+id/order_customer_name"
            ... />

        <TextView
            android:id="@+id/order_customer_cost"
            .../>

        <ImageView
            android:id="@+id/insert_customer_sandwich_btn"
            ... />

    </RelativeLayout>

    <ListView
        android:id="@+id/customer_sandwich_list"             
        android:visibility="gone"
        ..."/>

</LinearLayout>

在片段中，我正在像这样访问列表：

LayoutInflater layoutInflater = getLayoutInflater();
        View myView = layoutInflater.inflate(R.layout.order_item, null);

        customerSandwichListView = myView.findViewById(R.id.customer_sandwich_list);

所以我要在可扩展列表视图上附加一个OnChildClickListener，因此，当用户单击一个子级时，相应的列表应显示在其下方。我正在尝试通过以下代码实现该行为：

orderExpandableListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,int groupPosition, int childPosition, long id) {
                //showDialogFragment();
                //Toast.makeText(getContext(), "GP: " + groupPosition + ", CP: " + childPosition, Toast.LENGTH_SHORT).show();
                OrderCustomer currentOrderCustomer = (OrderCustomer) orderExpandableListAdapter
                        .getChild(groupPosition, childPosition);

                ArrayList<CustomerSandwich> customerSandwiches1 = customerSandwiches.get(currentOrderCustomer);

                adapter = new CustomerSandwichListAdapter(getContext(), R.layout.customer_sandwich_item, customerSandwiches1);
                //adapter.add(CustomerSandwich);
                customerSandwichListView.setAdapter(adapter);

                if(customerSandwichListView.getVisibility() == View.GONE)
                    customerSandwichListView.setVisibility(View.VISIBLE);
                else if(customerSandwichListView.getVisibility() == View.VISIBLE)
                    customerSandwichListView.setVisibility(View.GONE);
                return true;
            }
        });

但该列表从未出现，这可能是什么问题？如果您需要更多信息，请询问。

三级可扩展Listview

0 个答案: