RandomIntInternal or RandomSecure?

I was told about a flaw in my Android code through Veracode analysis, and it was because of

File image = File.createTempFile(imageFileName, ".jpg", storageDir);

Where imageFileName is created from a JPEG_+TimeStamp.

I thought RandomSecure() was enough to bypass this test (As I thought this was used for randomness), but I checked the code and createTempFile is generated from

result = new File(tmpDirFile, prefix + Math.randomIntInternal() + suffix);

And I can't find info about this, is it better than RandomSecure? Is it true random?