How can i create simple application

Question

Using java on android

Answer 1

If you don't have a PC or want to develop with Android, You have these two tools:

Java N-IDE: Java IDE that allows to create Android apps. It Is Simple but free and with everything you need.
https://play.google.com/store/apps/details?id=com.duy.compiler.javanide

AIDE: The most complete Android IDE. It allows You to create applications using Java and/or C++, has a tool to create Graphical Interfaces like Android Studio, you can get a apk ready to publish in the Playstore gone, etc. But not all of this is free.
https://play.google.com/store/apps/details?id=com.aide.ui

Answer 2

You can use Android Studio to create apps