Android自定义单选多选下拉列表的实例代码

public class MultiSelectPopupWindows extends PopupWindow {  private Context context;  private View parent;  private List<Search> data;  private int yStart;  private SearchPopupWindowsAdapter adapter;  public MultiSelectPopupWindows(Context context, View parent, int yStart, List<Search> data) {    this.context = context;    this.parent = parent;    this.yStart = yStart;    this.data = data;    initView();  }  private void initView() {    View view = View.inflate(context, R.layout.popupwindows_multiselect, null);    view.startAnimation(AnimationUtils.loadAnimation(context, R.anim.fade_in_slow));    LinearLayout linearLayout = (LinearLayout) view.findViewById(R.id.linearLayout_selector);    linearLayout.startAnimation(AnimationUtils.loadAnimation(context, R.anim.list_top_in));    ListView listView = (ListView) view.findViewById(R.id.listView_selector);    setWidth(ViewGroup.LayoutParams.MATCH_PARENT);    setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);    setBackgroundDrawable(new BitmapDrawable());    setFocusable(true);    setOutsideTouchable(true);    setContentView(view);    showAtLocation(parent, Gravity.TOP, 0, DensityUtil.dip2px(context, yStart));    update();    initListView(listView, data);  }  private void initListView(ListView listView, List<Search> data) {    adapter = new SearchPopupWindowsAdapter(context);    adapter.setItems(data);    listView.setAdapter(adapter);  }  public List getItemList() {    return adapter.getItemList();  }}