Android PopupMenu将重力设置为CENTER不起作用

Question

我尝试了这段代码。 并且还尝试了CENTER_HORIZONTAL和CENTER_VERTICAL。 锚点仍在视图的左侧

val menu = PopupMenu(this, view, Gravity.CENTER)
menu.inflate (R.menu.menu_avatar_2)
menu.show()

Answer 1

你不能用默认的控制它PopupMenu和PopupMenu(this, view, Gravity.CENTER)只设置的重力PopuMenu到您的权利anchorView 。

如果您真的想让文字具有引力，则可以使用以下选项：

1：使用PopupWindow ：

PopupWindow popupWindow = new PopupWindow(MainActivity.this);
popupWindow.setContentView(yourCustomView); // customview with list of textviews (with gravity inside)
popupWindow.showAsDropDown(anchorView); // display below the anchorview

2：使用ListPopupWindow ：

String[] products = {"Camera", "Laptop", "Watch", "Smartphone",
                        "Television", "Car", "Motor", "Shoes", "Clothes"};
ListPopupWindow listPopupWindow = new ListPopupWindow(MainActivity.this);
listPopupWindow.setAnchorView(view);
listPopupWindow.setDropDownGravity(Gravity.RIGHT);
listPopupWindow.setHeight(ListPopupWindow.WRAP_CONTENT);
listPopupWindow.setWidth(300);
listPopupWindow.setAdapter(new ArrayAdapter(MainActivity.this,
                            R.layout.list_item, products)); // list_item is your textView with gravity.
listPopupWindow.show();

Answer 2

很难将PopupMenu或PopupWindow与锚点居中对齐，因为它的位置部分取决于文本标签的长度。 但是您可以更改水平和垂直偏移，使其更加集中：

styles.xml：

<style name="PopupMenuMoreCentralized" parent="@style/Widget.AppCompat.PopupMenu">
    <item name="android:dropDownHorizontalOffset">4dp</item>
    <item name="android:dropDownVerticalOffset">-6dp</item>
</style>

Java代码：

new PopupMenu(context, anchor, Gravity.CENTER, 0, R.style.PopupMenuMoreCentralized)

要么

MenuPopupHelper menuPopupHelper = new MenuPopupHelper(context,
        (MenuBuilder) popupMenu.getMenu(),
        anchor,
        false,
        0,
        R.style.PopupMenuMoreCentralized);

来源： 实施带有边距的弹出菜单