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Added in API level 18

public static interface ViewTreeObserver.OnWindowFocusChangeListener

android.view.ViewTreeObserver.OnWindowFocusChangeListener

当视图层次结构的窗口焦点状态改变时，将调用回调的接口定义。

Public methods
`abstract void`	`onWindowFocusChanged(boolean hasFocus)` 回调方法在窗口焦点在视图树中更改时调用。

Added in API level 18

void onWindowFocusChanged (boolean hasFocus)

回调方法在窗口焦点在视图树中更改时调用。

Parameters
`hasFocus`	`boolean`: Set to true if the window is gaining focus, false if it is losing focus.