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文字
ZoomButtonsController.OnZoomListener
版本：Android 2.2 r1
结构
继承关系
public static interface ZoomButtonsController.OnZoomListener
android.widget.ZoomButtonsController.OnZoomListener
概述
当用户执行了互动或者触发了一些行为的接口，例如缩放。
公共方法
public abstract void onVisibilityChanged (boolean visible)
当缩放控件的显示发生变化时调用
参数
visible 缩放控件是否可见
public abstract void onZoom (boolean zoomIn)
当该控件的拥有者需要被缩放时候调用
参数
zoomIn 缩放的方向：true是放大，false是缩小