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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:
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
but if you want to work extremely then it is Eclipse