Apple's iCloud service is another effective way to remove your iPad passcode without a computer. It requires you to link your iPad with your iCloud account and enable the "Find My iPad" via iCloud.com. With this method, you can unlock your iPad remotely without needing you to sit at your computer
In the cases where you've forgotten your iPad password or need to change it for security reasons, Apple offers two ways to reset it.
Explains how to unlock or open the iPad if you forgot the passcode, password, code or ... iPad Troubleshooting & Repair Q&A - Revised December 7, 2011.
Luckily, Android has a failsafe built-in. All you need to do is enter your passcode incorrectly five times. Once you do, you should see a new button pop up on the bottom of your screen that says "Forgot Passcode" (or something similar.