修改frameworks/base/services/core/java/com/android/server/MountService.java文件中的onVolumeCreatedLocked函数将如下行

   // Adoptable public disks are visible to apps, since they meet

   // public API requirement of being in a stable location.

   if (vol.disk.isAdoptable() || vol.isPhoneStorage()) {

         vol.mountFlags |= VolumeInfo.MOUNT_FLAG_VISIBLE;

   }

   改成

   // Adoptable public disks are visible to apps, since they meet

   // public API requirement of being in a stable location.

   if (vol.disk.isAdoptable() || vol.isPhoneStorage() || vol.isUSBOTG()) {

    //额外增加USBOTG

         vol.mountFlags |= VolumeInfo.MOUNT_FLAG_VISIBLE;

   }