popupWindow.setClippingEnabled(false);
popupWindow.showAtLocation(getWindow().getDecorView(), Gravity.BOTTOM, 0, 0);
下边是源码
/**
* <p>Allows the popup window to extend beyond the bounds of the screen. By default the
* window is clipped to the screen boundaries. Setting this to false will allow windows to be
* accurately positioned.</p>
*
* <p>If the popup is showing, calling this method will take effect only
* the next time the popup is shown or through a manual call to one of
* the {@link #update()} methods.</p>
*
* @param enabled false if the window should be allowed to extend outside of the screen 如果允许窗口延伸到屏幕外，则为false
* @see #isShowing()
* @see #isClippingEnabled()
* @see #update()
*/
public void setClippingEnabled(boolean enabled) {
mClippingEnabled = enabled;
}
