Storing data in the sandbox

- It's good practice to use what's known as…internal file storage for your Android app…if it contains any sensitive information.…This stores the file in the app sandbox,…and it's set to private mode…so that it can't be accessed by other apps.…Let's see how we do this.…I've added some new code to our Hello World app…to declare a file called activation.dat…in the app's file directory,…and to append the text line to it…which contains my activation code.…I can click on the green play button…to build and run the program,…and then check the result.…

I've got my mobile phone connected via USB,…and I'll run the app on that.…I can open my app with JaDX,…and as expected, we can see the main activity Java file…and the activation code.…Let's see if we can access the file…on the device and read its contents.…We can use the ADB console to get shell,…and check the app's sandbox.…We're at the command line in my phone.…Application sandboxes is stored as folders…in the directory…data/data.…

When we try to access the standard application sandboxes,…