Looking for: Android FOSS Stock Tracker

I hope this questions hasn't been overdone, but for those active in financial markets does anyone have a recommendation for an app to track markets? I can only find widget apps with limited functionality (don't show volumes on graphs, missing trend data etc.)

I'm currently using Stocks Widget, which missing some graph features and the widget function is buggy on my phone. (https://github.com/premnirmal/StockTicker)

The source of the data isn't strictly important in my case, as long as it can pull EU market info.