findViewById(R.id.btn).setOnClickListener(new OnClickListener() {

			@Override

			public void onClick(View v) {

				LayoutInflater layoutInflater=activity.getLayoutInflater();

				View view=layoutInflater.inflate(android.R.layout.simple_list_item_1,null);

				PopupWindow pw=new PopupWindow(view,100,100);

				pw.setBackgroundDrawable(activity.getResources().getDrawable(R.drawable.ic_launcher));

				pw.setOutsideTouchable(true);

				pw.showAtLocation(activity.getWindow().getDecorView(), Gravity.CENTER, 0, 0);

			}

		});

当然你也可以将自己的控件放入窗体中.