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I would like to create a file which stores some data that can be accessed only by my app.Outside users should not be able to access this file or make any changes to it.I will store a key in the file which maybe accessed by the app whenever needed.
To create an application private file (that is not readable by other applications) you should use Context.openFileOutput() with a flag MODE_PRIVATE.
If you are concerned you could wrap the returned InputStream in CiperOutputStream and encrypt the contents.
If you are storing keys in a standard crypto format (X.509 or PKCS#12) you could use the new KeyChain API introduced in ICS.