title: How to read and write files to my cache?
body: <p>I want to save some cache data for my appliaction. I used to do this by saving the data in the external storage and this worked fine. But I want my device to show my cache size in the app settings but It doesn´t. I guess this is because I save the data in external storage. What I want is that my data still exists aufter closing the app or even swichen off my device. Now I tried to save my files in the internal storage but I have troubles reading the files + the cache size is still wrong in settings. Can anyone give me the methodes do write and read strings into files in the applications cache please?</p>