I previously posted a short tutorial on writing to and reading from text files stored on an Android device, using an App Inventor app.
Unfortunately, as some comments noted, the file being created seems to disappear – the data is written and can be read back – but the file is no where to be found on the phone!
After some research, I now know where the file is – and also how to copy the file from the phone (or tablet) to your personal computer. While the solution to finding and saving the file to your computer is ultimately easy, I need to update the tutorial and explain some things about the Android file system. You will also need to install a free app on your phone in order to copy the file to your computer.
I have posted an updated tutorial that explains the details and shows how to store your files in the right location, how to find them (they are hidden from most views), and how to copy them to your personal computer.