Which is the best IDE for Android Application Development?

Eclipse ADT

Abdroid Studio

Download this:

http://developer.android.com/sdk/index.html

This is a package from google which is a slightly modified version of eclipse for android, and it contains all of the required stuff i.e:

• Eclipse + ADT plugin
• Android SDK Tools
• Android Platform-tools
• The latest Android platform
• The latest Android system image for the emulator

Android Studio it's the official and best IDE from google to build Android App

Eclipse is very nice IDE 

but Android studio have many benefits from google 

I like android studio and sometimes I use eclipse

Android by default gives add-in with Eclipse but now days there are lot of tools they make life simpler

Some of third party ide

http://android-developers.blogspot.ae/2013/05/android-studio-ide-built-for-android.html

http://www.android-ide.com/

but if you want to work extremely then it is Eclipse