<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.example.spin.MainActivity" ><EditTextandroid:id="@+id/et_editText"android:layout_width="250dp"android:layout_height="50dp"android:layout_centerHorizontal="true"android:layout_marginTop="10dp"android:text="@string/hello_world" /><ImageView android:id="@+id/down"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/down_arrow"android:layout_alignRight="@id/et_editText"android:layout_marginTop="20dp"android:clickable="true"/></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:gravity="center_vertical"android:orientation="horizontal" ><ImageView android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/user"/><TextView android:id="@+id/tv_list_item"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:gravity="center_horizontal"android:text="100000000"/><ImageViewandroid:id="@+id/delete"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@drawable/delete"/></LinearLayout>

public class MainActivity extends ActionBarActivity {private EditText et_editText;//編輯框private ImageView down;//下拉按鈕private ListView listView;private List<String> numList;private PopupWindow popWin; private Boolean isDown=false;//判斷彈窗是否顯示 @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main); et_editText = (EditText) findViewById(R.id.et_editText);down = (ImageView) findViewById(R.id.down);//創建集合 儲存號碼numList = new ArrayList<String>();for(int i=0;i<20;i++){numList.add("100000000"+i);} initListView();//對下拉按鈕設置監聽 當進行點擊時 彈出popWindown.setOnClickListener(new OnClickListener() { @Overridepublic void onClick(View v) {if(!isDown){//定義一個popupWindowpopWin=new PopupWindow(MainActivity.this);popWin.setWidth(et_editText.getWidth());//設置寬度 和編輯框的寬度相同popWin.setHeight(200); //設置高度//為popWin填充內容popWin.setContentView(listView);//點擊popWin區域之外 自動關閉popWinpopWin.setOutsideTouchable(true);/*** 設置彈出窗口顯示的位置* 參數一:相對于參數的位置進行顯示 即在編輯框的下面顯示* 參數二 三:x y軸的偏移量*/popWin.showAsDropDown(et_editText, 0, 0);isDown=true;}else{popWin.dismiss();isDown=false;}}});}//點擊返回按鈕@Overridepublic void onBackPressed() {/*** 當用戶點擊返回按鈕時 是整個activity退出 而且給人的感覺是直接退出 窗口可能還是顯示狀態,為了避免內存泄露,先關閉彈窗 * * 當點擊返回按鈕時 如果窗口存在且正在顯示 則關閉窗口*/if(popWin!=null&&popWin.isShowing()){popWin.dismiss();}super.onBackPressed();}private void initListView() {listView = new ListView(this);//設置listView的背景listView.setBackgroundResource(R.drawable.listview_background);//設置條目之間的分割線及滾動條不可見listView.setDivider(null);listView.setVerticalScrollBarEnabled(false);//設置適配器listView.setAdapter(new MyListAdapter());}private class MyListAdapter extends BaseAdapter{@Overridepublic int getCount() {return numList==null?0:numList.size();}@Overridepublic View getView(final int position, View convertView, ViewGroup parent) {ViewHolder holder;if(convertView==null){convertView=View.inflate(getApplicationContext(), R.layout.list_item, null);holder=new ViewHolder();holder.tvNum=(TextView) convertView.findViewById(R.id.tv_list_item);holder.delete=(ImageView) convertView.findViewById(R.id.delete);convertView.setTag(holder);}else{holder=(ViewHolder) convertView.getTag();}holder.tvNum.setText(numList.get(position));//對刪除按鈕設置監聽事件holder.delete.setOnClickListener(new OnClickListener() { @Overridepublic void onClick(View v) {//當點擊刪除按鈕時 刪除條目numList.remove(position);//刷新ListViewMyListAdapter.this.notifyDataSetChanged();}});//對條目設置監聽事件 點擊條目后 將num設置到編輯框中convertView.setOnClickListener(new OnClickListener() { @Overridepublic void onClick(View v) {//點擊條目后 將num設置到編輯框中et_editText.setText(numList.get(position));popWin.dismiss();}});return convertView;}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return 0;}}private class ViewHolder {TextView tvNum;ImageView delete;}}