Things of Android

1. USB-OTG on 4.0 or higher

1. Buy a powered OTG cable.

2. root

3. vi /system/etc/vold.fstab and enable the following setting.

   # usb otg diskdev_mount usbotg /mnt/usbotg auto /devices/platform/mt_usb /devices/platform/musbfsh_hdrc

   
   

2. append a group to WRITE_EXTERNAL_STORAGE (http://blog.csdn.net/luozhuang/article/details/17024217)

1. root

2. use REto edit system\etc\permissions\platform.xml within r/w mode.

3. change as follows:

   before:
       <permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
           <group gid="sdcard_rw" />
       </permission>
   after:
       <permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
           <group gid="sdcard_rw" />
           <group gid="media_rw" />
       </permission>

4. save and reboot.