WindowManager设置添加的View全屏（覆盖状态栏和导航栏）

关键是修改WindowManager.LayoutParams

关键参数是设置忽略父窗口中的任何约束且允许窗口扩展到屏幕之外

params.flags =?WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN or
? ? ? ? ? ? ? ? WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS

和设置手机真正的高度（包括导航栏和状态栏）

val screenSize = Point()
windowManager.defaultDisplay.getRealSize(screenSize)
params.height = screenSize.y

完整代码：?

        val windowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManager

        val params = WindowManager.LayoutParams()
        // 设置Window Type
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
            params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
        else params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
        // 设置全屏最重要的参数是FLAG_LAYOUT_IN_SCREEN、FLAG_LAYOUT_NO_LIMITS
        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE or
                WindowManager.LayoutParams.FLAG_FULLSCREEN or
                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN or
                WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS or
                WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR or WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL

        params.gravity = Gravity.START or Gravity.TOP
        params.format = PixelFormat.RGBA_8888
        val screenSize = Point()
        windowManager.defaultDisplay.getRealSize(screenSize)
        params.width = screenSize.x
        params.height = screenSize.y //设置手机真正的分辨率高度（包括导航栏和状态栏）

        // 添加你需要显示的布局
        windowManager.addView(view, params)

参考大佬的文章：https://gist.github.com/kakajika/973667ccc945a1ad10e6eba0cef0f793?