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When you are trying to run your app in real android device, you need to turn on the developer options. However, most of smart phone company hides it behind, so you need to do several things. Actually, here is an adaptive instruction especially LGE (LG Electronics, Korea) smart phone. (I think the other smart phone could be turned on developer options using this method, but I am not sure.) Here is instructions 1. Go to Settings and then get into the General Tab. 2. You can see the About phone at the bottom of menu, and click it. 3. Click the second one from the bottom, Software information . 4. Finally, you can find out Build number . 5. Click it again, again, and again until you become a developer. Thanks! Have Fun!

Mostly, this is because of environment variables JAVA_HOME and JDK_HOME Set like this! Variable name: JAVA_HOME Variable value: C:\Program Files\JAVA\jdk1.8.X_XX Variable name: JDK_HOME Variable value: C:\Program Files\JAVA\jdk1.8.X_XX and add the Path! and then you can figure out that this is get right echo %JAVE_HOME% echo %JDK_HOME% Thanks! Details: http://techglimpse.com/google-android-studio-launching-fix-windows/