How to Fix Android Compose Compiler Errors — Compose Not Compiling

In this tutorial, you'll learn about How to Fix Android Compose Compiler Errors. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

The Problem

Compose code does not compile:

'composable' functions are restricted to Compose functions.

or:

The Compose compiler requires Kotlin 1.9.0 but you are using 1.8.0.

Quick Fix

Step 1: Set the correct Kotlin version

// settings.gradle
plugins {
    id 'org.jetbrains.kotlin.android' version '1.9.22' apply false
}

Step 2: Set the Compose compiler version

// app/build.gradle
android {
    composeOptions {
        kotlinCompilerExtensionVersion = "1.5.10"
    }
}

Step 3: Use the Compose BOM

dependencies {
    def composeBom = platform("androidx.compose:compose-bom:2024.02.00")
    implementation composeBom
    implementation "androidx.compose.ui:ui"
    implementation "androidx.compose.material3:material3"
}

Step 4: Add Compose compiler plugin

// app/build.gradle.kts
plugins {
    id("org.jetbrains.kotlin.plugin.compose") version "2.0.0"
}

Step 5: Check annotation usage

WRONG:

fun MyScreen() {  // Missing @Composable annotation
    Text("Hello")
}

RIGHT:

@Composable
fun MyScreen() {
    Text("Hello")
}

Step 6: Import the correct packages

import androidx.compose.runtime.Composable
import androidx.compose.material3.Text

Prevention

• Align Kotlin and Compose compiler versions using the compatibility table.
• Use the Compose BOM to manage UI library versions.
• Enable the Compose compiler plugin in your build script.

Common Mistakes with compose compiler

1. Non-exhaustive pattern matches that compile with warnings then crash at runtime
2. Misunderstanding that String is [Char] with poor performance for large text operations
3. Using foldl instead of foldl' causing stack overflow on large lists

These mistakes appear frequently in real-world Android code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ