下拉选择框，PopuWindows使用下拉选择框，PopuWindows使用

【下拉选择框，PopuWindows使用】效果图

文章图片
Popuwindows.gif

1：布局文件中声明布局

2：准备数据，准备ListView // 初始化要显示的内容 private void initListView() { listView = new ListView(this); listView.setDividerHeight(0); listView.setBackgroundResource(R.drawable.listview_background); listView.setOnItemClickListener(this); datas = new ArrayList(); // 创建一些数据 for (int i = 0; i < 30; i++) { datas.add((10000 + i) + ""); }listView.setAdapter(new MyAdapter()); }@Override public void onItemClick(AdapterView parent, View view, int position, long id) { System.out.println("onItemClick: " + position); String string = datas.get(position); et_input.setText(string); // 设置文本popupWindow.dismiss(); // 消失了 }class MyAdapter extends BaseAdapter {@Override public int getCount() { return datas.size(); }@Override public Object getItem(int position) { return datas.get(position); }@Override public long getItemId(int position) { return position; }@Override public View getView(final int position, View convertView, ViewGroup parent) { View view; if(convertView == null){ view = View.inflate(parent.getContext(), R.layout.item_number, null); }else { view = convertView; }TextView tv_number = (TextView) view.findViewById(R.id.tv_number); tv_number.setText(datas.get(position)); view.findViewById(R.id.ib_delete).setOnClickListener(new OnClickListener() {@Override public void onClick(View v) { datas.remove(position); notifyDataSetChanged(); if(datas.size() == 0){ // 如果删除的是最后一条, 隐藏popupwindow popupWindow.dismiss(); } } }); return view; }}

3：创建showPopupWindow方法 private void showPopupWindow() { initListView(); // 显示下拉选择框（放入的控件，宽，高） popupWindow = new PopupWindow(listView, et_input.getWidth(), 300); // 设置点击外部区域, 自动隐藏 popupWindow.setOutsideTouchable(true); // 外部可触摸 popupWindow.setBackgroundDrawable(new BitmapDrawable()); // 设置空的背景, 响应点击事件popupWindow.setFocusable(true); //设置可获取焦点// 显示在指定控件下 popupWindow.showAsDropDown(et_input, 0, -5); }