Android : Static variable null on low memory

Question

I have an application which has some static variables. These variables are stored in an independent Class named DataContext. These variables are initialized from raw files a

Answer 1

Most likely the issue is that your application is being killed while it is in the background, and then recreated when you come back to it. Check out the Activity Lifecycle documentation on when this might occur for a single activity. You need to make sure that you move anything stored in memory to more permanent storage at the correct point in time to avoid losing that information if the app gets killed.

I'm not sure what exactly you are storing, but it sounds like using Shared Preferences might work well. This page on Data Storage explains a number of different ways of more permanently storing data, including Shared Preferences.