is it possible to run the metasploit framework on Android devices? I've googled it up and found this link. But there's an access denied error.
Any ideas?
Judging from my own Google results, I would say it is possible.
There is no direct port of metasploit to Android but there are other methods:
dSploit which has support for many of Metasploit's methods
A side note: your link requires you to create an account. If you're this curious, you might as well. Of course if you're suspicious of the website, use Tor and a throw-away email address to make the account.