How far away is the Bart station from the Oracle Arena in Oakland?

I'm debating on taking Bart to the Hanna Montana concert so I don't have to bother with driving in traffic and deal with parking but I am concerned with how far away the walk is and how well the lighting is around the walking area.I'm taking my 5 year old keep in mind and I know Oakland has a serious crime rate.Do they have extra security on the streets for these kind of events?