Android Studio is an IDE based on Intellij IDEA released by Google, together with the Android SDK tools. It replaces Eclipse with ADT as the official IDE for Android after reaching the 1.0 milestone in Dec 2014.
Download Android Studio and SDK Tools | Android Developers
Android Studio Tips & Tricks: Moving Around
Android Studio Tips Of the Day – Roundup #1
Android Studio Tips Of the Day – Roundup #2
Mastering the Terminal side of Android development – Medium 2016-11