Intellark

Intellark is Intellaren's Arabic keyboard layout, a patented intuitive and easy keyboard layout for typing in Arabic. It is designed for keyboard typists who type using Latin-based keyboard layouts, but wish to use their typing knowledge to type in languages that are scripted using the Arabic alphabet.
Intellark uses your typing-in-English knowledge, and your knowledge about Arabic alphabetical ordering to let you learn to type in Arabic quickly and intuitively. Here is how: If English and Arabic letters sound the same, use them. If Arabic letters among themselves are related in shape or sound, tap the key twice or more very rapidly. For a quick tutorial to learn Intellark, go to http://intellaren.com/intellark/tutorial

In order to enable Intellark after downloading, you must go to Settings -> Language and Input. Under Keyboards and input methods, you’ll see all of the keyboards currently installed on your device. Make sure Intellark is checked.
Once you have Intellark enabled, you can use it whenever you’re typing in a text box. You can quickly switch between enabled keyboards by opening your notification bar menu (usually by swiping down on your screen) and selecting Choose Input Method.