How to select an image from Android device

Hi! I need some help, please! I'm making an Android app where I want the user to select an image from the gallery to load into the app, I've seen the method selectInput() but it's only working in Java mode for me, not in Android. When trying it in Android mode it gives me this error: The method selectInput(String, String) is undefined for the type "nameOfTheSketch" And says that the Compile Failed.