Android Studio
Official IDE for Android app development
Android Studio is the official IDE for building Android apps. It's based on IntelliJ IDEA and includes everything needed to develop, test, and debug applications for phones, tablets, watches, and TVs. The visual layout editor shows how apps will look across devices. Emulators test on virtual hardware. Profilers identify performance problems. It's a complete environment purpose-built for Android. Serious Android development happens in Android Studio. Google maintains it, documentation assumes it, and the ecosystem revolves around it.