GET and POST requests in Android Kotlin - UI Render Trace

Component - GET and POST requests

This UI component shows how an Android app sends GET and POST requests to a web server. It has two buttons: one to fetch data (GET) and one to send data (POST). The results appear below the buttons.

Widget Tree

LinearLayout (vertical)
├─ Button (GET Request)
├─ Button (POST Request)
└─ TextView (Response Display)

A vertical layout with two buttons stacked on top and a text area below to show server responses.

Render Trace - 4 Steps

Step 1: LinearLayout

Step 2: Button (GET Request)

Step 3: Button (POST Request)

Step 4: TextView (Response Display)

State Change - Re-render

Trigger:User taps 'GET Request' or 'POST Request' button

Before

TextView is empty or shows previous response

→

After

TextView updates with new server response text

Re-renders:TextView only re-renders to show updated response

UI Quiz - 3 Questions

What happens when the user taps the 'GET Request' button?

A The app sends a POST request and clears the screen

B The app sends a GET request and shows the response below

C The app closes immediately

D Nothing happens

Key Insight

In mobile apps, network requests like GET and POST are triggered by user actions such as button taps. The UI updates only the parts that show new data, keeping the app responsive and clear. Using a vertical layout with buttons and a text area is a simple way to let users interact and see results immediately.