android弹出窗口的实现（PopupWindow）

    最近做商城，有个收藏功能，需要弹出窗口。在网上找了类似的效果。方法不少，还是觉得用PopupWindow最省力效果也是最好的。下面介绍下PopupWindow。
   PopupWindow就是弹出窗口的意思，类似windows下面的开始按钮。PopupWindow可以实现浮层效果，而且可以自定义显示位置，出现和退出时的动画。

首先自定义顶部栏这个根据自己的需求样式做，这里就不写了。直接上最主要代码：

private PopupWindow popupWindow;
private View view;
private ListView CollectBookView;//定义的列表显示数据

private void showWindow() {
    // TODO Auto-generated method stub
    if (popupWindow == null) {
        LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = layoutInflater.inflate(R.layout.book_collect, null);
        popupWindow = new PopupWindow(view, 260, 421);//显示位置
    }
    // 加载数据
    CollectBookView = (ListView) view.findViewById(R.id.this_book);
    String columns[] = new String[] {
            DataCenter.Collect.COLUMN_NAME_APPNAME,
            DataCenter.Collect.COLUMN_NAME_APPID };
    Cursor c = getContentResolver().query(DataCenter.Collect.CONTENT_URI,
            columns, DataCenter.Collect.COLUMN_NAME_USERID+"="+GeneralUtil.getUid(getApplicationContext()), null, null);

    List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
    c.moveToFirst();
   
    while (!c.isAfterLast()) {
        mAppName = c.getString(c
                .getColumnIndex(DataCenter.Collect.COLUMN_NAME_APPNAME));
       
        HashMap<String, Object> item = new HashMap<String, Object>();
        mAppId =  c.getInt(c
                .getColumnIndex(DataCenter.Collect.COLUMN_NAME_APPID));
        item.put("id",mAppId);
        item.put("name", mAppName);
        data.add(item);
        c.moveToNext();
    }
    c.close();
    SimpleAdapter adapter = new SimpleAdapter(this, data,
            R.layout.book_collect_item, new String[] { "name" },
            new int[] { R.id.book_collect_item_text });
    CollectBookView.setAdapter(adapter);
    CollectBookView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            // TODO Auto-generated method stub
           
            SimpleAdapter adapter = (SimpleAdapter) CollectBookView.getAdapter();
            HashMap<String, Object> item = (HashMap<String, Object>) adapter.getItem(arg2);
           
            Intent i = new Intent(getApplicationContext(),
                    DetailAppInfoActivity.class);
            i.putExtra(DetailAppInfoActivity.EXTRA_KEY_APPID, item.get("id").toString());
            popupWindow.dismiss();
            startActivityForResult(i,DetailAppInfoActivity.REQUEST_SHOW_DETAILS);
            finish();

        }
    });

//长按选项删除内容
    CollectBookView.setOnItemLongClickListener(new OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            // TODO Auto-generated method stub
            SimpleAdapter adapter = (SimpleAdapter) CollectBookView.getAdapter();
            final HashMap<String, Object> item = (HashMap<String, Object>) adapter.getItem(arg2);
            new AlertDialog.Builder(BaseBottomTabActivity.this)
            .setTitle("是否删除"+item.get("name").toString())
            .setPositiveButton("确定",
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog,int which) {
                            // TODO Auto-generated method stub
                           
                            getContentResolver().delete(DataCenter.Collect.CONTENT_URI,
                                    DataCenter.Collect.COLUMN_NAME_USERID+"=? and "+DataCenter.Collect.COLUMN_NAME_APPID+"=?",
                                    new String[] {GeneralUtil.getUid(getApplicationContext()), item.get("id").toString()});
                            String columns[] = new String[] {
                                    DataCenter.Collect.COLUMN_NAME_APPNAME,
                                    DataCenter.Collect.COLUMN_NAME_APPID };
                            Cursor c = getContentResolver().query(DataCenter.Collect.CONTENT_URI,
                                    columns, null, null, null);

                            List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
                            c.moveToFirst();
                           
                            while (!c.isAfterLast()) {
                                mAppName = c.getString(c
                                        .getColumnIndex(DataCenter.Collect.COLUMN_NAME_APPNAME));
                               
                                HashMap<String, Object> item = new HashMap<String, Object>();
                                mAppId =  c.getInt(c
                                        .getColumnIndex(DataCenter.Collect.COLUMN_NAME_APPID));
                                item.put("id",mAppId);
                                item.put("name", mAppName);
                                data.add(item);
                                c.moveToNext();
                            }
                            c.close();
                            SimpleAdapter adapter = new SimpleAdapter(BaseBottomTabActivity.this, data,
                                    R.layout.book_collect_item, new String[] { "name" },
                                    new int[] { R.id.book_collect_item_text });

                            CollectBookView.setAdapter(adapter);
                        }
                    }).setNegativeButton("取消", null).show();
            return false;
        }
    });
    popupWindow.setFocusable(true);//获取焦点
    popupWindow.setOutsideTouchable(true);//点击popupWindow以外的地方popupWindow消失
    popupWindow.setBackgroundDrawable(new BitmapDrawable());
    popupWindow.showAsDropDown(book_collect, 793, 0);
}

效果如图：（此图网络截取）

 

一般此种需求是全局性的，最好定义一个BaseActivity，让其他Activity能够继承使用。

已经测试，如有错误，敬请指出。