android ICS부터 MTP를 지원합니다.
Gingerbread의 Mass Storage 방식으로 수정해 보겠습니다.
overlay/frameworks/base/core/res/xml/storage_list.xml 입니다.
<StorageList xmlns:android="http://schemas.android.com/apk/res/android">
<!-- removable is not set in nosdcard product -->
<storage android:mountPoint="/mnt/sdcard"
android:storageDescription="@string/
storage_usb"
android:primary="true"
android:emulated="true"
android:mtpReserve="100" />
</StorageList>
아래와 같이 바꿉니다.
<StorageList xmlns:android="http://schemas.android.com/apk/res/android">
<!-- removable is not set in nosdcard product -->
<storage android:mountPoint="/mnt/sdcard"
android:storageDescription="@string/
storage_internal"
android:primary="true"
android:emulated="false"
android:allowMassStorage="true" />
</StorageList>
init.[PRODUCT_NAME].rc
fuse 관련된 부분 삭제 합니다.
on post-fs-data
# we will remap this as /mnt/sdcard with the sdcard fuse tool
mkdir /data/media 0775 media_rw media_rw
chown media_rw media_rw /data/media
on fs
mount ext4 ...
mount ext4 ...
mount ext4 ...
setprop ro.crypto.fuse_sdcard true
#/sdcard
export EXTERNAL_STORAGE /mnt/sdcard
mkdir /mnt/sdcard 0000 system system
symlink /mnt/sdcard /sdcard
# create virtual SD card at /mnt/sdcard, based on the /data/media directory
# daemon will drop to user/group system/media_rw after initializing
# underlying files in /data/media will be created with user and group media_rw (1023)
service sdcard /system/bin/sdcard /data/media 1023 1023
class late_start
init.[PRODUCT_NAME].usb.rc
on property:sys.usb.config=
mtp
write /sys/class/android_usb/android0/enable 0
...
...
setprop sys.usb.state $sys.usb.config
on property:sys.usb.config=
mtp,adb
...
...
start adbd
mtp를 mass_storage로 바꿉니다.
그리고 vold.fstab을 만듭니다.
## Vold 2.0 Generic fstab
## - San Mehat (san@android.com)
##
#######################
## Regular device mount
##
## Format: dev_mount <label> <mount_point> <part> <sysfs_path1...>
## label - Label for the volume
## mount_point - Where the volume will be mounted
## part - Partition # (1 based), or 'auto' for first usable partition.
## <sysfs_path> - List of sysfs paths to source devices, must start with '/' character
## flags - (optional) Comma separated list of flags, must not contain '/' character
######################
dev_mount sdcard /mnt/sdcard auto [vfat mount 할 node] nonremovable,encryptable
그리고 BoardCongig.mk 또는 device.mk에 vold.fstab를 복사하는 문장 추가합니다.
PRODUCT_COPY_FILES += \
device/hardkernel/odroida4/vold.fstab:system/etc/vold.fstab \
...
persist.sys.usb.config=mtp를 mass_storage로 변경...
# Set default USB interface
PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
persist.sys.usb.config=
mass_storage
이렇게 수정하면 ICS에서도 Gingerbread의 화면을 보실 수 있습니다.
http://source.android.com/devices/tech/storage/config-example.html
