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元は、こんな感じで問題ありませんでした。


ext.versions = [
  'kotlin'  : '1.6.21'
  'compose' : '1.2.0-rc02'
]

dependencies {
  classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${versions.kotlin}"
}

composeOptions {
  kotlinCompilerExtensionVersion versions.compose
}


implementation "androidx.compose.material:material:${versions.compose}"
implementation "androidx.compose.material:material-icons-extended:${versions.compose}"
implementation "androidx.compose.ui:ui:${versions.compose}"
implementation "androidx.compose.ui:ui-tooling-preview:${versions.compose}"
debugImplementation "androidx.compose.ui:ui-tooling:${versions.compose}"
debugImplementation "androidx.compose.ui:ui-test-manifest:${versions.compose}"
androidTestImplementation "androidx.compose.ui:ui-test-junit4:${versions.compose}"

アップデート通知が出たので、いつものように


1.3.0-alpha01

に上げました。


ext.versions = [
  'kotlin'  : '1.6.21'
  'compose': '1.3.0-alpha01'
]

...

ビルドできなくなりました。

なんでや。

■ kotlin と compose の関係

kotlin と compose には、お互いに対応するバージョンが決まっていましたね!

👉 Compose to Kotlin Compatibility Map | Android Developers

あれ、compose「1.3.0-alpha01」がないよ!

■ 「Compose」は1つではない

Jetpack Compose is multiple things under one name:

- A compiler plugin that helps efficiently calculate the difference between two in-memory tree data structures
- A new UI toolkit for Android
- A new UI toolkit for desktop apps (Compose Desktop)

👉 Drop "androidx" from Jetpack Compose package name, for multiplatform, before 1.0 release. · Change.org

どうやら、Android でいうと compose は

- compose compiler
- compose ui toolkit

の2つに分かれているようです

👉 This version (1.2.0-alpha08) of the Compose Compiler requires Kotlin version 1.6.20 but you appear to be using Kotlin version 1.6.21 which is not known to be compatible.

■ まとめ

上記2つのことを考慮して書き換えます。


ext.versions = [
  'kotlin'    : '1.7.0'
  'compose'   : '1.2.0',         // compose-compiler
  'composeUi' : '1.3.0-alpha01'  // compose-ui
]

dependencies {
  classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${versions.kotlin}"
}

composeOptions {
  kotlinCompilerExtensionVersion versions.compose // compose-compiler
}

// compose-ui
implementation "androidx.compose.material:material:${versions.composeUi}"
implementation "androidx.compose.material:material-icons-extended:${versions.composeUi}"
implementation "androidx.compose.ui:ui:${versions.composeUi}"
implementation "androidx.compose.ui:ui-tooling-preview:${versions.composeUi}"
debugImplementation "androidx.compose.ui:ui-tooling:${versions.composeUi}"
debugImplementation "androidx.compose.ui:ui-test-manifest:${versions.composeUi}"
androidTestImplementation "androidx.compose.ui:ui-test-junit4:${versions.composeUi}"

👉 This version (1.2.0-alpha08) of the Compose Compiler requires Kotlin version 1.6.20 but you appear to be using Kotlin version 1.6.21 which is not known to be compatible.

// ViewModel private val _sending = mutableStateOf(false) val sending: State<Boolean> = _sending // * fun send() { viewModelScope.launch(Dispatchers.IO) { _sending.value = true delay(5000) // heavy _sending.value = false } }