Java is needed to write the programs, the Android SDK is needed to make those programs run on Android and Android Studio has the job of putting it all together for you.

Android Studio lets you access Codota by right-clicking on Java code in the editor window and selecting the Get relevant examples menu item, as shown in Figure 16.

The Dalvik and ART runtime environments can compile that Java bytecode to run on any one of several processor architectures, so developers can write code once that will run on Android devices ...