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Gson が R8 で落ちる

最終更新日時 : 2023-09-10 15:42

Android Studio, Gradle, SDK のアップデートで避けては通れない。

いろいろ悩む前に、通信周りは R8 の変化を気にしおくといい、


# Prevent R8 from leaving Data object members always null
-keepclassmembers,allowobfuscation class * {
  @com.google.gson.annotations.SerializedName <fields>;
}

# Retain generic signatures of TypeToken and its subclasses with R8 version 3.0 and higher.
-keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
-keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken

👉 gson/examples/android-proguard-example/proguard.cfg at main · google/gson

ここらは、Gson 以外の JSON パーサーにも似たようなことが言える。

Retrofit を使ってる方は、必須の注意事項。

どんなライブラリよりも先に疑った方がいい。

Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /app/build/outputs/mapping/debug/missing_rules.txt https://t.co/EQlKzX1qy2 #プログラミング #kotlin

— chanzmao (@maochanz) August 25, 2023

【Kotlin DSL】Deprecated な packagingOptions が fun Packaging.() に変換される件

最終更新日時 : 2023-08-28 16:47

これは?

以下の記述が


packagingOptions {
  resources {
    excludes += "META-INF/rxjava.properties"
  }
}

これになりました。


fun Packaging.() {
  resources {
    excludes += "META-INF/rxjava.properties"
  }
}

なんだかおかしいです?

該当部分のコードを確認します。


    /**
     * Specifies options and rules that determine which files the Android plugin packages into your
     * APK.
     *
     * For more information about the properties you can configure in this block, see [Packaging].
     */
    @Deprecated("Renamed to packaging", replaceWith = ReplaceWith("packaging"))
    val packagingOptions: Packaging

    /**
     * Specifies options and rules that determine which files the Android plugin packages into your
     * APK.
     *
     * For more information about the properties you can configure in this block, see [Packaging].
     */
    @Deprecated("Renamed to packaging", replaceWith = ReplaceWith("packaging"))
    fun packagingOptions(action: Packaging.() -> Unit)

    /**
     * Specifies options and rules that determine which files the Android plugin packages into your
     * APK.
     *
     * For more information about the properties you can configure in this block, see [Packaging].
     */
    val packaging: Packaging

    /**
     * Specifies options and rules that determine which files the Android plugin packages into your
     * APK.
     *
     * For more information about the properties you can configure in this block, see [Packaging].
     */
    fun packaging(action: Packaging.() -> Unit)

👉 build-system/gradle-api/src/main/java/com/android/build/api/dsl/CommonExtension.kt - platform/tools/base - Git at Google

こうですね。


packaging {
  resources {
    excludes += "META-INF/rxjava.properties"
  }
}

ついでに、短くしておきます。


packaging {
  resources.excludes += "META-INF/rxjava.properties"
}

これでOK。

👉 How to replace deprecated packagingOptions in Android Gradle build files - Stack Overflow

Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /app/build/outputs/mapping/debug/missing_rules.txt

最終更新日時 : 2023-08-25 16:55

Android Gradle プラグインを 8.1.1 にアップデートしたら以下のエラーでビルドできない。

Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /app/build/outputs/mapping/debug/missing_rules.txt.

Missing class com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite$Loader (referenced from: java.util.List kotlinx.coroutines.internal.FastServiceLoader.load(java.lang.Class, java.lang.ClassLoader))

Caused by: [CIRCULAR REFERENCE: com.android.tools.r8.utils.b: Missing class com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite$Loader (referenced from: java.util.List kotlinx.coroutines.internal.FastServiceLoader.load(java.lang.Class, java.lang.ClassLoader))]

メッセージにある missing_rules.txt ファイルを確認します。

一度、直上の debug ディレクトリで Reload from Disk すると現れます。


# Please add these rules to your existing keep rules in order to suppress warnings.
# This is generated automatically by the Android Gradle plugin.
-dontwarn com.google.protobuf.java_com_google_android_gmscore_sdk_target_granule__proguard_group_gtm_N1281923064GeneratedExtensionRegistryLite$Loader