要從選定的ListView項中獲取該項，請參考ContextMenuInfo對象(請參見下面的最后一個實現方法)。完整解決方案如下：
1)在ListActivity類中為上下文菜單注冊ListView
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// ...
getListView().setAdapter(mAdapter);
registerForContextMenu(getListView());
}
1a)如果列表上有復雜的視圖，則可能需要在Adapter類中的每個列表視圖上啟用長按
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
RelativeLayout layout = (RelativeLayout) LayoutInflater.from(mContext).inflate(R.layout.list_item, parent, false);
itemLayout = layout;
itemLayout.setLongClickable(true);
}
// ...
return view;
}
2)在ListActivity類中實現onCreateContextMenu()和onContextItemSelected()
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
String title = ((MyItem) mAdapter.getItem(info.position)).getTitle();
menu.setHeaderTitle(title);
menu.add(Menu.NONE, MENU_CONTEXT_DELETE_ID, Menu.NONE, DELETE_TEXT);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case MENU_CONTEXT_DELETE_ID:
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
Log.d(TAG, "removing item pos=" + info.position);
mAdapter.remove(info.position);
return true;
default:
return super.onContextItemSelected(item);
}
}
