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1, 浮动窗口，特殊的View

wm = (WindowManager) context                .getSystemService(Activity.WINDOW_SERVICE);        params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT                | WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;        params.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL                | LayoutParams.FLAG_NOT_FOCUSABLE; wm.addView(floatingView, params); 

  管理view

3, surfaceview

视频窗口，会在wm service中创建新的window

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