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Added in API level 4

public static interface ZoomButtonsController.OnZoomListener

android.widget.ZoomButtonsController.OnZoomListener

将在用户执行触发某些操作的交互（例如缩放）时调用的接口。

Public methods
`abstract void`	`onVisibilityChanged(boolean visible)` 当缩放控件的可见性发生变化时调用。
`abstract void`	`onZoom(boolean zoomIn)` 当所有者视图需要放大时调用。

Added in API level 4

void onVisibilityChanged (boolean visible)

当缩放控件的可见性发生变化时调用。

Parameters
`visible`	`boolean`: Whether the zoom controls are visible.

Added in API level 4

void onZoom (boolean zoomIn)

当所有者视图需要放大时调用。

Parameters
`zoomIn`	`boolean`: The direction of the zoom: true to zoom in, false to zoom out.