/**
* 设置 dialog的高度
* 可根据list的条数来设置高度
* @param dialog
*/
private void setDialogHeight(List list, AlertDialog dialog) {
WindowManager m = getWindowManager();
Display display = m.getDefaultDisplay();
WindowManager.LayoutParams p = dialog.getWindow().getAttributes(); //获取对话框当前的参数值
if (list.size() > 5) p.height = (int) (display.getHeight() * 0.5);//设置为当前屏幕高度的一半
if (list.size() <= 5) p.height = RecyclerView.LayoutParams.WRAP_CONTENT;
dialog.getWindow().setAttributes(p); //设置生效
}