Android SDK and API levels in Android Kotlin - UI Render Trace

Component - Android SDK and API levels

This UI component shows how Android SDK versions and API levels relate to app compatibility. It displays the current device API level and the minimum SDK version required by the app. This helps developers understand if their app can run on the device.

Widget Tree

LinearLayout (vertical)
├─ TextView (App Title)
├─ TextView (Device API Level)
├─ TextView (App Min SDK)
└─ Button (Check Compatibility)

A vertical layout with a title at the top, followed by two text lines showing device API level and app minimum SDK version, and a button at the bottom to check compatibility.

Render Trace - 5 Steps

Step 1: LinearLayout

Step 2: TextView (App Title)

Step 3: TextView (Device API Level)

Step 4: TextView (App Min SDK)

Step 5: Button (Check Compatibility)

State Change - Re-render

Trigger:User taps the 'Check Compatibility' button

Before

No compatibility message shown

→

After

A Toast message appears: 'Compatible: Yes' or 'Compatible: No' depending on API levels

Re-renders:Only the Toast message appears; main UI remains unchanged

UI Quiz - 3 Questions

What does the 'Device API Level' text show?

A The API level of the device's Android system

B The Android version number of the device

C The minimum SDK version the app supports

D The maximum SDK version the app supports

Key Insight

Using clear labels and a simple vertical layout helps users quickly understand device compatibility with the app. Showing both device API level and app minimum SDK side by side makes the concept tangible and easy to grasp.