Android SystemUI状态栏&通知栏图标及字体颜色切换流程

当Window 界面切换的时候，会调用Statusbar.setSystemUiVisibility()

@Override
    public void setSystemUiVisibility(int vis, int fullscreenStackVis, int dockedStackVis,
            int mask, Rect fullscreenStackBounds, Rect dockedStackBounds) {
        //调用LightBarController的onSystemUiVisibilityChanged方法
        mLightBarController.onSystemUiVisibilityChanged(fullscreenStackVis, dockedStackVis,
                mask, fullscreenStackBounds, dockedStackBounds, sbModeChanged, mStatusBarMode);
    }

   LightBarController.java 
    public void onSystemUiVisibilityChanged(int fullscreenStackVis, int dockedStackVis,
            int mask, Rect fullscreenStackBounds, Rect dockedStackBounds, boolean sbModeChanged,
            int statusBarMode) {
        int oldFullscreen = mFullscreenStackVisibility;
        int newFullscreen = (oldFullscreen & ~mask) | (fullscreenStackVis & mask);
        int diffFullscreen = newFullscreen ^ oldFullscreen;
        int oldDocked = mDockedStackVisibility;
        int newDocked = (oldDocked & ~mask) | (dockedStackVis & mask);
        int diffDocked = newDocked ^ oldDocked;
        if ((diffFullscreen & View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR) != 0
                || (diffDocked & View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR) != 0
                || sbModeChanged
                || !mLastFullscreenBounds.equals(fullscreenStackBounds)
                || !mL