So, if I learn Java, I could make android apps or I need to know anything else?

Answer 1

You have to learn the Android Java & XML API

Answer 2

Learning Java is essential but for Android apps is more specific so you should look for Android development with Android Studio. If you already know Java, it will be very easy cause you're already used to it.

Answer 3

learning android is basically like learning new classes for java, since it all has the same syntax