popupWindow 用法总结 控制位置

/**
 * Displays the content view in a popup window anchored to the corner of
 * another view. The window is positioned according to the specified
 * gravity and offset by the specified x and y coordinates.
 * <p>
 * If there is not enough room on screen to show the popup in its entirety,
 * this method tries to find a parent scroll view to scroll. If no parent
 * view can be scrolled, the specified vertical gravity will be ignored and
 * the popup will anchor itself such that it is visible.
 * <p>
 * If the view later scrolls to move <code>anchor</code> to a different
 * location, the popup will be moved correspondingly.
 *
 * @param anchor the view on which to pin the popup window
 * @param xoff A horizontal offset from the anchor in pixels
 * @param yoff A vertical offset from the anchor in pixels
 * @param gravity Alignment of the popup relative to the anchor
 *
 * @see #dismiss()
 */
public void showAsDropDown(View anchor, int xoff, int yoff, int gravity)
/**
 * <p>
 * Display the content view in a popup window at the specified location. If the popup window
 * cannot fit on screen, it will be clipped. See {@link android.view.WindowManager.LayoutParams}
 * for more information on how gravity and the x and y parameters are related. Specifying
 * a gravity of {@link android.view.Gravity#NO_GRAVITY} is similar to specifying
 * <code>Gravity.LEFT | Gravity.TOP</code>.
 * </p>
 *
 * @param parent a parent view to get the {@link android.view.View#getWindowToken()} token from
 * @param gravity the gravity which controls the placement of the popup window
 * @param x the popup‘s x location offset
 * @param y the popup‘s y location offset
 */
public void showAtLocation(View parent, int gravity, int x, int y)

/**
 * <p>Changes the focusability of the popup window. When focusable, the
 * window will grab the focus from the current focused widget if the popup
 * contains a focusable {@link android.view.View}.  By default a popup
 * window is not focusable.</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 focusable true if the popup should grab focus, false otherwise.
 *
 * @see #isFocusable()
 * @see #isShowing()
 * @see #update()
 */
public void setFocusable(boolean focusable) {
	mFocusable = focusable;
}

/**
 * <p>Controls whether the pop-up will be informed of touch events outside
 * of its window.  This only makes sense for pop-ups that are touchable
 * but not focusable, which means touches outside of the window will
 * be delivered to the window behind.  The default is false.</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 touchable true if the popup should receive outside
 * touch events, false otherwise
 *
 * @see #isOutsideTouchable()
 * @see #isShowing()
 * @see #update()
 */
public void setOutsideTouchable(boolean touchable) {
	mOutsideTouchable = touchable;
}