Building Android Apps on Ubuntu

I want to learn to build apps on Ubuntu, so after doing some resarch, I found out I need to install Eclipse.

The problem I have now is which one:

There's SO many on:

http://www.eclipse.org/downloads/

or I should install:

sudo aptitude search eclipse p eclipse
- Extensible Tool Platform and Java IDE p eclipse-cdt
- C/C++ Development Tools for Eclipse p eclipse-cdt-jni
- C/C++ Development Tools for Eclipse (JNI) p eclipse-egit
- Eclipse Team provider for the Git version control system p eclipse-emf
- Eclipse Modeling Framework (EMF) p eclipse-emf-examples
- Eclipse EMF/XSD examples p eclipse-emf-sdk
- Eclipse Modeling Framework (EMF) - (Source/Documentation) p eclipse-jdt
- Eclipse Java Development Tools (JDT) p eclipse-jgit
- Java implementation of GIT for Eclipse p eclipse-pde
- Eclipse Plug-in Development Environment (PDE) p eclipse-platform
- Eclipse platform without development plug-ins p eclipse-platform-data
- Eclipse platform without development plug-ins (data) p eclipse-rcp
- Eclipse Rich Client Platform (RCP) p eclipse-rse
- Eclipse Remote System Explorer (RSE) p eclipse-xsd
- XML Schema Definition (XSD) for Eclipse p eclipse-xsd-sdk
- XML Schema Definition (XSD) for Eclipse - (Source/Documentation) p libcommons-jci-eclipse-java
- common Java interface for various compilers - Eclipse JDT p libeclipselink-java
- Eclipse Persistence Services Project p libeclipselink-java-doc
- Documentation for libeclipselink-java p redeclipse
- multiplayer FPS game based on Cube2 p redeclipse-data
- data for the Red Eclipse FPS game p redeclipse-dbg
- debug symbols for the Red Eclipse FPS game p redeclipse-server
- server for the Red Eclipse FPS game p redeclipse-server-dbg
- debug symbols for the Red Eclipse dedicated server