android - 根据 Material 设计规范创建 "Simple Menu"

Question

根据这个http://www.google.com/design/spec/components/menus.html#menus-simple-menus ，第一个菜单项与原始行的垂直中心对齐，如下所示:

我正在尝试为 ListView 项目创建此菜单，如下所示:

@Override
public void onListItemClick(ListView l, View v, final int position, long id) {
    PopupMenu popup = new PopupMenu(getContext(), v, Gravity.CENTER_HORIZONTAL);
    popup.getMenuInflater().inflate(R.menu.bus_line_popup, popup.getMenu());
    popup.setOnMenuItemClickListener(...);
    popup.show();
}

然而，菜单并没有按照规范正确显示:

如何使菜单完全按要求显示？

Answer 1

我做了一点搜索，请参阅:http://developer.android.com/reference/android/widget/PopupMenu.html

A PopupMenu displays a Menu in a modal popup window anchored to a View. The popup will appear below the anchor view if there is room, or above it if there is not. If the IME is visible the popup will not overlap it until it is touched. Touching outside of the popup will dismiss it.

作为doc说，这似乎是正常的当有空间时，它会显示在 View 下方(像你的情况)，如果没有roow，它将显示在 View 上方。