Android透明状态栏

protected fun transparentStatusBar(activity: Activity) {
        if (Build.VERSION.SDK_INT >= 21) {
            val window: Window = activity.window
            //添加Flag把状态栏设为可绘制模式
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
            window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
            window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_LAYOUT_STABLE)
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
            window.statusBarColor = Color.TRANSPARENT
            //view不根据系统窗口来调整自己的布局
            val mContentView = window.findViewById(Window.ID_ANDROID_CONTENT) as ViewGroup
            val mChildView = mContentView.getChildAt(0)
            if (mChildView != null) {
                ViewCompat.setFitsSystemWindows(mChildView, false)
                ViewCompat.requestApplyInsets(mChildView)
            }
        }else{
            window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS)
        }
    }