Enhance an android App - Fix a graph, add a column in DB and add filter

Hi, I'm trying my hardest to finish this project since it's a non-profit purpose and I don't have enough time to work on it. It's an inventory management app, and the main issue is the history graph, which I can't go ahead without it. I'd like to fix it to become a combo graph which contains the amount of items that came in and went out by month plus the revenue/costs (also categorized by month - same graph, same data). Another requirement is to add a filter in 3 classes so that it would be easier to find a specific item in a huge list. The last and most simple request is to retrieve the data into the field in the class, but the data is located in another table (from another class).