Android Studio
The Official IDE for Android

Android Studio provides the fastest tools for building apps on every type of Android device.

World-class code editing, debugging, performance tooling, a flexible build system, and an instant build/deploy system all allow you to focus on building unique and high quality apps.

Download all RAR file and move to one folder and extract from the first part.

I split this file into 100mb each for slow internet connection

For windows:

Link 1: Android studio part 1

Link 2: Android studio part 2

Link 3: Android studio part 3

Link 4: Android studio part 4

Link 5: Android studio part 5

Link 6: Android studio part 6

Link 7: Android studio part 7

Link 8: Android studio part 8

Link 9: Android studio part 9