Sensor data displayed on android device

Hi guys, need some guidance regarding this matter which I'll explain below.

My project is basically to send the data received by the temperature sensor and ldr sensor from the arduino uno microcontroller to my android device using a basic customer built application that just displays this information.

In the past I have successfully been able to get the data from the arduino serial monitor and to display the data into a java application made from scratch using JDK which is all fine.

What I need guidance on is what would I change in the code to display this data on an simple android application?

Help would be much appreciated.