Yes, there is an app which converts Objective-C to Java. You will still need to know some Java but it saves you a lot of time porting to Android. It comes with an Android compatibility project which you can add as a dependency in eclipse. It has customizable type and method mappings and you can specify method mappings using a template system.
Check it out here... O2J - Objective-C to Java Converter
Here's their how-to video... O2J Howto Video
