[android-developers] Uri from FilePath?

[I have asked this question on Stackoverflow, but haven't gotten any
replies in 2 days]

Hi,

I am using the Gallery3D-Code for a test-app but want it to only
display images from a sub-folder on the SD, not all of the images that
are stored on it. To do this, I tried to change

public static final Uri STORAGE_URI =
Images.Media.EXTERNAL_CONTENT_URI;

to
public static final String ROOT_DIR =
Environment.getExternalStorageDirectory().toString() + "/
mySubDirectory";
public static final Uri STORAGE_URI = Uri.fromFile(new
File(ROOT_DIR));

but I guess this is transforming a content://-Uri to a file://-Uri and
this may be a problem?

In any case, it doesn't work :-(! Instead of just showing images from
the ROOT_DIR-directory and its sub-directories, it shows no images at
all ("Gallery empty"). Could anyone point me in the right direction as
to what I am doing wrong?

Thanks for your help,
Nick

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