Android Development

So I began looking into Android development shortly after I purchased the Droid X.  I have been having a lot of fun but I know little Java so the prospect of me developing great apps without this knowledge is very slim.  So I decided to purchase a book on Java development and have begun my look into that.  I took a Java course in college but it was my very first programming class and very little of the information I learned stick with me.  Hopefully it will be like riding a bike and it will all come flooding back to me.  Anybody that has any tips for beginning Android development is welcome to share their experiences.