1.修改sdcard写权限

2.init.rc中创建软链接

diff --git a/system/core/rootdir/init.rc b/system/core/rootdir/init.rc

index 6c2e301..251a68b 100755

--- a/system/core/rootdir/init.rc

+++ b/system/core/rootdir/init.rc

@@ -61,6 +61,11 @@ on init

mkdir /dev/stune/background

mkdir /dev/stune/top-app

mkdir /dev/stune/rt

+ mkdir /dev/block/platform 0777 root root

+ mkdir /dev/block/platform/mtk-msdc.0 0777 root root

+ mkdir /dev/block/platform/mtk-msdc.0/11230000.MSDC0 0777 root root

+ symlink /dev/block/by-name /dev/block/platform/mtk-msdc.0/11230000.MSDC0/by-name

+

chown system system /dev/stune

chown system system /dev/stune/foreground

chown system system /dev/stune/background

@@ -87,7 +92,7 @@ on init

mkdir /mnt/secure/asec 0700 root root

mkdir /mnt/asec 0755 root system

mkdir /mnt/obb 0755 root system

- mkdir /mnt/media_rw 0750 root media_rw

+ mkdir /mnt/media_rw 0777 root media_rw

mkdir /mnt/user 0755 root root

mkdir /mnt/user/0 0755 root root

mkdir /mnt/expand 0771 system system

diff --git a/system/vold/model/PublicVolume.cpp b/system/vold/model/PublicVolume.cpp

index fc7e96f..8551ed1 100644

--- a/system/vold/model/PublicVolume.cpp

+++ b/system/vold/model/PublicVolume.cpp

@@ -136,13 +136,13 @@ status_t PublicVolume::doMount() {

}

if (mFsType == "vfat") {

- if (vfat::Mount(mDevPath, mRawPath, false, false, false, AID_MEDIA_RW, AID_MEDIA_RW, 0007,

+ if (vfat::Mount(mDevPath, mRawPath, false, false, false, AID_MEDIA_RW, AID_MEDIA_RW, 0000,

true)) {

PLOG(ERROR) << getId() << " failed to mount " << mDevPath;

return -EIO;

}

} else if (mFsType == "exfat") {

- if (exfat::Mount(mDevPath, mRawPath, AID_MEDIA_RW, AID_MEDIA_RW, 0007)) {

+ if (exfat::Mount(mDevPath, mRawPath, AID_MEDIA_RW, AID_MEDIA_RW, 0000)) {

PLOG(ERROR) << getId() << " failed to mount " << mDevPath;

return -EIO;

}

@@ -183,6 +183,7 @@ status_t PublicVolume::doMount() {

"-u", "1023", // AID_MEDIA_RW

"-g", "1023", // AID_MEDIA_RW

"-U", std::to_string(getMountUserId()).c_str(),

+ "-w",

mRawPath.c_str(),

stableName.c_str(),

NULL)) {