Why do I get this Android Jetpack Compose Preview error

Introduction

When transitioning to Jetpack Compose, you may encounter an error when trying to open the preview of a composition. In this article, we will discuss the issue you described and suggest ways to resolve it.

Description of the Problem

You added Jetpack Compose to an old project and encountered a ResourceResolutionException error while trying to open the preview of the HourlyItem component. The error is related to attempting to load the resource Window_backgroundDimAmount.

Example Code

@Composable
private fun HourlyItem(
    modifier: Modifier = Modifier,
    iconResource: Int,
    time: String,
    temperature: Int,
) {
    Row(modifier = Modifier.fillMaxWidth()) {
        Icon(
            painter = painterResource(iconResource),
            contentDescription = null,
            modifier = Modifier.size(36.dp),
            tint = MaterialTheme.colorScheme.primary,
        )
        Text(text = time)
        Text(text = stringResource(R.string.temp, temperature))
    }
}

@Preview
@Composable
private fun HourlyItemPreview() {
    HourlyItem(
        iconResource = R.drawable.ic_weather_clear_day,
        time = "12pm",
        temperature = 78,
    )
}

Analysis of the Error

The ResourceResolutionException error indicates a problem with loading the resource. In this case, the compiler ca

ot find the Window_backgroundDimAmount resource. This can be associated with several reasons:

1. Incorrect resource definition.
2. Project configuration issues.
3. Incorrect usage of Jetpack Compose API.

Solution

Checking Resources

Ensure that your resources are correctly defined in your project. If the Window_backgroundDimAmount resource is a system resource, it should be available without additional actions. However, if it is a custom resource, make sure it exists and is correctly defined.

Example Resource Check

1. Open your project's res folder.
2. Navigate to values and check for the styles.xml file.
3. Ensure the resource is defined there or in another location.

Updating Project Configuration

Check your project configuration and ensure that all dependencies and plugins are installed correctly.

Example build.gradle Configuration

buildscript {
    ext.kotlin_version = "2.4.10"
    ext.hilt_version = "2.60.1"
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:9.4.0'
        classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"
        classpath("org.jetbrains.kotlin.plugin.compose:org.jetbrains.kotlin.plugin.compose.gradle.plugin:$kotlin_version")
    }
}

plugins {
    id 'com.google.devtools.ksp' version '2.3.4'
    apply false
}

apply plugin: 'com.android.application'
apply plugin: 'com.google.dagger.hilt.android'
apply plugin: 'com.google.devtools.ksp'
apply plugin: 'org.jetbrains.kotlin.plugin.compose'

android {
    buildFeatures {
        viewBinding true
        buildConfig = true
        compose = true
    }
}

Using painterResource Instead of iconResource

If the resource is not found, try using painterResource instead of iconResource.

Example Code

@Composable
private fun HourlyItem(
    modifier: Modifier = Modifier,
    painter: Painter,
    time: String,
    temperature: Int,
) {
    Row(modifier = Modifier.fillMaxWidth()) {
        Icon(
            painter = painter,
            contentDescription = null,
            modifier = Modifier.size(36.dp),
            tint = MaterialTheme.colorScheme.primary,
        )
        Text(text = time)
        Text(text = stringResource(R.string.temp, temperature))
    }
}

@Preview
@Composable
private fun HourlyItemPreview() {
    val painter = painterResource(id = R.drawable.ic_weather_clear_day)
    HourlyItem(
        painter = painter,
        time = "12pm",
        temperature = 78,
    )
}

Practical Tips

1. Check Kotlin Version: Make sure you are using the latest version of Kotlin, as some issues might be related to compatibility.
2. Update Dependencies: Ensure all dependencies are updated to the latest versions.
3. Use Error Analysis Tools: Utilize tools like the Kotlin Compiler Plugin and Hilt Compiler to identify potential issues.

Conclusion

If the problem persists after performing all the above steps, consider consulting the documentation or developer community for additional assistance.

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