android - 选择后自定义微调器不隐藏下拉菜单

Question

(Android API 版本 9)我使用自定义适配器创建了一个微调器，并覆盖了 getView() 以使用我的具有 TextView 的 xml 文件对其进行扩充。但是现在，我的微调器在用户选择一个项目后没有关闭下拉列表。选择一个项目后是否有关闭微调器下拉菜单的方法？

代码

//Code in onCreate function
    Spinner list = (Spinner) findViewById(R.id.spn_purchaseList);
    listAdapter = new ItemListAdapter(this, new MyItemList());
    list.setAdapter(listAdapter);
    listAdapter.item_list.addItem(new MyItem("Test", "Test Item"));
    listAdapter.notifyDataSetChanged();
//onCreate end
//the class below is inside "MainActivity extends Activity"
class ItemListAdapter extends BaseAdapter
{
    Context context;
    MyItemList item_list;
    MyItem selectedItem;


    ItemListAdapter(Context con,MyItemList k)
    {
        super();
        this.context=con;
        this.item_list=k;
        selectedItem=null;
    }

    @Override
    public int getCount() {

        return item_list.getCount();
    }

    @Override
    public MyItem getItem(int arg0) {

        return this.item_list.getList().get(arg0);
    }

    @Override
    public long getItemId(int arg0) {

        return  this.item_list.getPosition(this.item_list.getList().get(arg0));
    }

    @Override
    public View getView(int position, View arg1, ViewGroup parent) {

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
        View spinner_item = inflater.inflate(R.layout.spinner_layout, parent, false);

        TextView tx = (TextView)spinner_item.findViewById(R.id.txt_spinner);
        tx.setId((int) item_list.getPosition(item_list.getList().get(position)));


        tx.setText(this.item_list.getList().get(position).name.toString());
        tx.setBackgroundResource(R.drawable.spinner_item);

        tx.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                selectedItem = item_list.getItem(v.getId());
                list.setSelection(v.getId());



            }
        });

        return spinner_item;
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent)
    {


        return getView(position,convertView,parent);

    }

}

Answer 1

调用 setVisibility(View.GONE) 可以隐藏下拉菜单，但它似乎会导致 Spinner 状态出现问题，即您将无法在关闭下拉菜单后重新打开它。

首选方法是获取 Spinner 的句柄并从 onClick() 监听器调用其 onDetachedFromWindow()。

@Override
public void onClick(View v) {
    // code here to get selected item and do something with it

    // hide the spinner dropdown
    Spinner spinner = (Spinner) findViewById(R.id.mySpinner);
    if (spinner != null) {
        try {
            Method method = Spinner.class.getDeclaredMethod("onDetachedFromWindow");
            method.setAccessible(true);
            method.invoke(spinner);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}