(Android API版本9)我创建了一个带有自定义适配器的微调器,并覆盖了getView()以使用具有文本视图的xml文件对其进行充气.但是现在,我的微调器没有在用户选择项目后关闭下拉列表.无论如何在选择项目时关闭微调器下拉列表？

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);

}

}

解决方法:

调用setVisibility(View.GONE)可以隐藏下拉列表,但它似乎会导致Spinner状态出现问题,即在关闭后您将无法重新打开下拉列表.

首选方法是获取Spinner的句柄并从onClick()侦听器调用它的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();

}

}

}

标签：android,android-spinner

来源： https://codeday.me/bug/20190708/1407177.html