If the sdcard gets unmounted, any process with an open file handle to
it gets killed.

Letting the system process be killed was considered a bad thing.  To
avoid that, the system process (which is to say any system process) is
not allowed to access the SD card.

FYI, you probably will not be able to install your apk with the system
uid on most secured devices, unless you are in possession of the
system certificate for the devices on which you want to deploy.

What exactly do you need to access in the /system folder?  You do know
it's mounted read-only, right?

Technically, anything regarding the system folder is beyond the bounds
of discussion of android-developers which is supposed to be confined
to the SDK APIs.

On Nov 4, 10:57 pm, xhy <[email protected]> wrote:
> Hi all,Now I come across a question,I want to visit the system folder in the
> android file system.So i add the "android:SharedUserId=android.uid.system"
> in the manifest.xml,But I can not visit the USB device if that.
>
> --
> Hongyue Xu

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