ViewRootImpl和WindowManagerService笔记

时间：2014-08-05 14:17:29 收藏：0 阅读：391

1、每一个窗口的ViewRootImpl都有一个mWindowAttributes窗口属性，该属性在WindowManagerGlobal.updateViewLayout()->ViewRootImpl.setView()和WindowManagerGlobal.updateViewLayout->ViewRootImpl.setLayoutParams()中赋值，同时ViewRootImpl.mWindowAttributesChanged也会设为true表示窗口属性已更改，当窗口属性更改时，surfaceChanged也会设置为true

 if (mWindowAttributesChanged) {
            mWindowAttributesChanged = false;
            surfaceChanged = true;
            params = lp;
        }

当surfaceChanged设置为true时，下面这段代码会调用

if (surfaceChanged) {
                        mSurfaceHolderCallback.surfaceChanged(mSurfaceHolder,
                                lp.format, mWidth, mHeight);
                        SurfaceHolder.Callback callbacks[] = mSurfaceHolder.getCallbacks();
                        if (callbacks != null) {
                            for (SurfaceHolder.Callback c : callbacks) {
                                c.surfaceChanged(mSurfaceHolder, lp.format,
                                        mWidth, mHeight);
                            }
                        }
                    }

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