The DOS Operating System running DOSBox Emulators are most helpful in running Windows or MS-DOS compatible files over cross-platform. (An nice app like Greenify by Oasisfeng) Java. ' This will set portrait mode by default and let you customize rotation for other apps. Citra Emulator is the newest emulator on the list.It has a friendly interface (without App drawer). Just open up the Visual Studio Emulator for Android entry in your Start Menu, hit play, and the emulator is ready to debug from any IDE. This Dalvik VM is actually an interpreter for the Java programming language. Java emulator for android without root gradle.