You're looking for a tool to develop Android version of apps which already exist? So cross-platform ability, which is a key benefit, won't be used?
I'd recommend you to invest some time in native Android development. You are probably familiar with Objective-C, getting into JAVA won't be a tough task. Native apps get better ratings than web apps because of their consistent look (buttons and other layout components) and way better performance. PhoneGap apps run enjoyable on iOS devices but lag even on dual-core Androids like the Samsung Galaxy Nexus.
Getting started:
- Android SDK Download
- Eclipse IDE Download
- Google's Getting Started Training
