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PopupWindowCompat

public final class PopupWindowCompat
extends Object

java.lang.Object
   ↳ android.support.v4.widget.PopupWindowCompat

Helper用于访问在向后兼容的API级别4之后引入的PopupWindow中的功能。

Summary

Public methods
static boolean getOverlapAnchor(PopupWindow popupWindow)

当显示为下拉菜单时，返回弹出窗口是否应该与其锚点视图重叠。
static int getWindowLayoutType(PopupWindow popupWindow)

返回此窗口的布局类型。
static void setOverlapAnchor(PopupWindow popupWindow, boolean overlapAnchor)

显示为下拉菜单时，设置弹出窗口是否应与其锚点视图重叠。
static void setWindowLayoutType(PopupWindow popupWindow, int layoutType)

为此窗口设置布局类型。
static void showAsDropDown(PopupWindow popup, View anchor, int xoff, int yoff, int gravity)

在一个弹出窗口中显示内容视图，该窗口通过指定的x和y坐标偏移到锚点视图的左下角。

Inherited methods
From class java.lang.Object

Public methods

getOverlapAnchor

boolean getOverlapAnchor (PopupWindow popupWindow)

当显示为下拉菜单时，返回弹出窗口是否应该与其锚点视图重叠。

Parameters
popupWindow PopupWindow
Returns
boolean Whether the popup should overlap its anchor.

getWindowLayoutType

int getWindowLayoutType (PopupWindow popupWindow)

返回此窗口的布局类型。

Parameters
popupWindow PopupWindow
Returns
int

也可以看看：

setOverlapAnchor

void setOverlapAnchor (PopupWindow popupWindow, 
                boolean overlapAnchor)

显示为下拉菜单时，设置弹出窗口是否应与其锚点视图重叠。

Parameters
popupWindow PopupWindow
overlapAnchor boolean: Whether the popup should overlap its anchor.

setWindowLayoutType

void setWindowLayoutType (PopupWindow popupWindow, 
                int layoutType)

为此窗口设置布局类型。 该值将传递至type因此该值应与任何值type接受的值相匹配。

Parameters
popupWindow PopupWindow
layoutType int: Layout type for this window.

也可以看看：

showAsDropDown

void showAsDropDown (PopupWindow popup, 
                View anchor, 
                int xoff, 
                int yoff, 
                int gravity)

在一个弹出窗口中显示内容视图，该窗口通过指定的x和y坐标偏移到锚点视图的左下角。 如果屏幕上没有足够的空间来显示完整的弹出窗口，则此方法尝试查找要滚动的父滚动视图。 如果没有父滚动视图可以滚动，则弹出框的左下角固定在锚视图的左上角。

如果视图稍后滚动以将 anchor移动到其他位置，则弹出窗口将相应地移动。

Parameters
popup PopupWindow: the PopupWindow to show
anchor View: the view on which to pin the popup window
xoff int: A horizontal offset from the anchor in pixels
yoff int: A vertical offset from the anchor in pixels
gravity int: Alignment of the popup relative to the anchor
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