Android中8.0悬浮窗权限permission denied for window type 2003问题

问题：
android.view.WindowManager

BadTokenException :Unable to add window android.view.ViewRootImpl 

W@9ce576c -- permission denied for window type 2003
at android.view.ViewRootImpl.setView(ViewRootImpl.java:1074)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:460)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:121)
at com.newings.android0.x200.view.VoiceWindow.showWindow(VoiceWindow.java:144)
at com.newings.android0.x200.view.VoiceWindow.showPopupWindow(VoiceWindow.java:63)
at com.newings.android0.x200.TaskController.requestMicrophone(TaskController.java:793)
at com.newings.android0.x200.view.RecordButton.onTouchEvent(RecordButton.java:58)
at android.view.View.dispatchTouchEvent(View.java:13603)

    关于6.0以上的处理方式这里就不说了，网上一搜就有。这里说说8.0以上的解决方法：
    8.0以上需要将：WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
    替换为：WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY

链接：https://www.jianshu.com/p/35bb2dccd30d