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                這里,先總結一下前面講解中和Surface有關的流程: - 在ViewRoot構造時,會創建一個Surface,它使用無參構造函數,代碼如下所示: ~~~ private final Surface mSurface = new Surface(); ~~~ - ViewRoot通過IWindowSession和WMS交互,而WMS中會調用的一個attach函數,會構造一個SurfaceSession,代碼如下所示: ~~~ void windowAddedLocked() { if(mSurfaceSession == null) { mSurfaceSession = new SurfaceSession(); mNumWindow++; } } ~~~ - ViewRoot在performTransval的處理過程中會調用IWindowSession的relayout函數。這個函數還沒有分析。 - ViewRoot調用Surface的lockCanvas,得到一塊畫布。 - ViewRoot調用Surface的unlockCanvasAndPost釋放這塊畫布。 這里從relayout函數開始分析,來看。
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