How to save parsed data in android?

Question

I am creating an android application in which I am parsing so much XML data (XML data comes from a server) which contains Strings and image url's also.I need to use this data in many part of application. So for saving all these data I have used ArrayList and HashMap.I have declared ArrayList's and HashMap's variables in a single class as public static variables so I can access this data through a single class whenever I need.

And for images I have created ArrayList and placed in same single class same as other data(public static).Once I download a image through image url's I save those image drawables to these ArrayList variables so whenever I need any image again so I use these variables to get it.

Now my doubt is whether this approach is right or not. Please suggest me the right way.

Thank you