We discussed android a lot in previous articles. Now let's begin to code. Before that, we need to know about Android Studio. Android Studio is the official Integrated Development Environment (IDE). Before reading this you should read this portion. Why we need the Android studio A flexible Gradle-based build system A fast and feature-rich emulator A unified environment where you can develop for all Android devices Instant Run to push changes to your running app without building a new APK Code templates and GitHub integration to help you build common app features and import sample code Extensive testing tools and frameworks Lint tools to catch the performance, usability, version compatibility, and other problems C++ and NDK support Built-in support for Google Cloud Platform, making it easy to integrate Google Cloud Messaging and App Engine Now Download Android Studio and other tools. I mentioned about tools in here . Let's create a HelloWorld Applica...