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                ### 8.2 Window的內部機制 Window是一個抽象的概念,每一個Window都對應著一個View和一個ViewRootImpl, Window和View通過ViewRootImpl來建立聯系,因此Window并不是實際存在的,它是以View的形式存在。這點從WindowManager的定義也可以看出,它提供的三個接口方法addView、updateViewLayout以及removeView都是針對View的,這說明View才是Window存在的實體。在實際使用中無法直接訪問Window,對Window的訪問必須通過WindowManager。為了分析Window的內部機制,這里從Window的添加、刪除以及更新說起。
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