Jetpack Compose类反编译异常及源码下载失败问题求助

问题详情 #

学习Jetpack Compose时，打开material3库中的Scaffold相关类，显示的是反编译后的.class文件而非源码，反编译代码如下：

// IntelliJ API Decompiler stub source generated from a class file
// Implementation of methods is not available

package androidx.compose.material3

private val FabSpacing: androidx.compose.ui.unit.Dp /* compiled code */

internal val LocalFabPlacement: androidx.compose.runtime.ProvidableCompositionLocal<androidx.compose.material3.FabPlacement?> /* compiled code */

@androidx.compose.material3.ExperimentalMaterial3Api public var ScaffoldSubcomposeInMeasureFix: kotlin.Boolean /* compiled code */
    public final @androidx.compose.material3.ExperimentalMaterial3Api get
    public final @androidx.compose.material3.ExperimentalMaterial3Api set(value: kotlin.Boolean) {/* compiled code */ }

@androidx.compose.runtime.Composable @androidx.compose.runtime.ComposableInferredTarget private fun LegacyScaffoldLayout(fabPosition: androidx.compose.material3.FabPosition, topBar: @androidx.compose.runtime.Composable () -> kotlin.Unit, content: @androidx.compose.runtime.Composable (androidx.compose.foundation.layout.PaddingValues) -> kotlin.Unit, snackbar: @androidx.compose.runtime.Composable () -> kotlin.Unit, fab: @androidx.compose.runtime.Composable () -> kotlin.Unit, contentWindowInsets: androidx.compose.foundation.layout.WindowInsets, bottomBar: @androidx.compose.runtime.Composable () -> kotlin.Unit): kotlin.Unit { /* compiled code */ }

@androidx.compose.runtime.Composable @androidx.compose.runtime.ComposableInferredTarget public fun Scaffold(modifier: androidx.compose.ui.Modifier = COMPILED_CODE, topBar: @androidx.compose.runtime.Composable () -> kotlin.Unit = COMPILED_CODE, bottomBar: @androidx.compose.runtime.Composable () -> kotlin.Unit = COMPILED_CODE, snackbarHost: @androidx.compose.runtime.Composable () -> kotlin.Unit = COMPILED_CODE, floatingActionButton: @androidx.compose.runtime.Composable () -> kotlin.Unit = COMPILED_CODE, floatingActionButtonPosition: androidx.compose.material3.FabPosition = COMPILED_CODE, containerColor: androidx.compose.ui.graphics.Color = COMPILED_CODE, contentColor: androidx.compose.ui.graphics.Color = COMPILED_CODE, contentWindowInsets: androidx.compose.foundation.layout.WindowInsets = COMPILED_CODE, content: @androidx.compose.runtime.Composable (androidx.compose.foundation.layout.PaddingValues) -> kotlin.Unit): kotlin.Unit { /* compiled code */ }

@androidx.compose.runtime.Composable @androidx.compose.runtime.ComposableInferredTarget private fun ScaffoldLayout(fabPosition: androidx.compose.material3.FabPosition, topBar: @androidx.compose.runtime.Composable () -> kotlin.Unit, content: @androidx.compose.runtime.Composable (androidx.compose.foundation.layout.PaddingValues) -> kotlin.Unit, snackbar: @androidx.compose.runtime.Composable () -> kotlin.Unit, fab: @androidx.compose.runtime.Composable () -> kotlin.Unit, contentWindowInsets: androidx.compose.foundation.layout.WindowInsets, bottomBar: @androidx.compose.runtime.Composable () -> kotlin.Unit): kotlin.Unit { /* compiled code */ }

@androidx.compose.runtime.Composable @androidx.compose.runtime.ComposableInferredTarget private fun ScaffoldLayoutWithMeasureFix(fabPosition: androidx.compose.material3.FabPosition, topBar: @androidx.compose.runtime.Composable () -> kotlin.Unit, content: @androidx.compose.runtime.Composable (androidx.compose.foundation.layout.PaddingValues) -> kotlin.Unit, snackbar: @androidx.compose.runtime.Composable () -> kotlin.Unit, fab: @androidx.compose.runtime.Composable () -> kotlin.Unit, contentWindowInsets: androidx.compose.foundation.layout.WindowInsets, bottomBar: @androidx.compose.runtime.Composable () -> kotlin.Unit): kotlin.Unit { /* compiled code */ }

点击「Download resources」尝试下载源码时，出现Gradle构建错误：

FAILURE: Build failed with an exception.

* Where:
Initialization script 'C:\Users\ad011\AppData\Local\Temp\ijmiscinit1.gradle' line: 25

* What went wrong:
Execution failed for task ':app:DownloadSources'.
> Could not resolve all files for configuration ':app:downloadSources_01e59d2f-b2e1-4cb4-af0e-21e0cab1c0b2'.
   > Could not find androidx.compose.material3:material3-android:1.2.1@aar.
     Searched in the following locations:
       - https://dl.google.com/dl/android/maven2/androidx/compose/material3/material3-android/1.2.1@aar/material3-android-1.2.1@aar.pom
       - https://repo.maven.apache.org/maven2/androidx/compose/material3/material3-android/1.2.1@aar/material3-android-1.2.1@aar.pom
     Required by:
         project :app

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

BUILD FAILED in 11s
1 actionable task: 1 executed

项目当前app/build.gradle配置如下：

plugins {
    id("com.android.application")
    id("org.jetbrains.kotlin.android")
}

android {
    namespace = "com.example.jetpack_compose"
    compileSdk = 34

    defaultConfig {
        applicationId = "com.example.jetpack_compose"
        minSdk = 24
        targetSdk = 34
        versionCode = 1
        versionName = "1.0"

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables {
            useSupportLibrary = true
        }
    }

    buildTypes {
        release {
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = "1.8"
    }
    buildFeatures {
        compose = true
    }
    composeOptions {
        kotlinCompilerExtensionVersion = "1.5.1"
    }
    packaging {
        resources {
            excludes += "/META-INF/{AL2.0,LGPL2.1}"
        }
    }
}

dependencies {

    implementation("androidx.core:core-ktx:1.12.0")
    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
    implementation("androidx.activity:activity-compose:1.8.2")
    implementation(platform("androidx.compose:compose-bom:2024.02.02"))
    implementation("androidx.compose.material3:material3")

    //view model
    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.7.0")
    //hilt
    implementation("androidx.hilt:hilt-navigation-compose:1.1.0-alpha01")
    //coil
    implementation("io.coil-kt:coil-compose:2.6.0")

    testImplementation("junit:junit:4.13.2")
    androidTestImplementation("androidx.test.ext:junit:1.1.5")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
    androidTestImplementation(platform("androidx.compose:compose-bom:2024.02.02"))

    // compose
    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
    debugImplementation("androidx.compose.ui:ui-tooling")
    debugImplementation("androidx.compose.ui:ui-test-manifest")

    // constrains layout
    implementation ("androidx.constraintlayout:constraintlayout-compose:1.0.1")
    
    implementation("androidx.compose.ui:ui:")
    implementation("androidx.compose.ui:ui-graphics")
    implementation("androidx.compose.ui:ui-tooling-preview")
    implementation("androidx.compose.runtime:runtime:1.6.3")
    implementation("androidx.compose.runtime:runtime-livedata:1.6.3")
    implementation("androidx.compose.runtime:runtime-rxjava2:1.6.3")
}

问题原因 #

1. 依赖版本冲突：使用Compose BOM管理版本的同时，手动指定部分Compose依赖版本（如androidx.compose.runtime:runtime:1.6.3），导致BOM版本管理失效，出现依赖解析异常。
2. 无效依赖配置：存在无版本号的依赖（如androidx.compose.ui:ui:），Gradle无法正确解析。
3. 版本不兼容：Compose Compiler版本与Kotlin插件版本未匹配，导致依赖解析错误。

解决方案 #

1. 修正依赖配置，统一使用Compose BOM管理版本 #

删除手动指定版本的Compose依赖及无版本号依赖，让BOM自动管理所有Compose相关依赖版本。修改后的dependencies块如下：

dependencies {

    implementation("androidx.core:core-ktx:1.12.0")
    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
    implementation("androidx.activity:activity-compose:1.8.2")
    implementation(platform("androidx.compose:compose-bom:2024.02.02"))
    implementation("androidx.compose.material3:material3")
    // 由BOM管理版本的基础Compose依赖
    implementation("androidx.compose.ui:ui")
    implementation("androidx.compose.ui:ui-graphics")
    implementation("androidx.compose.ui:ui-tooling-preview")
    implementation("androidx.compose.runtime:runtime")
    implementation("androidx.compose.runtime:runtime-livedata")
    implementation("androidx.compose.runtime:runtime-rxjava2")

    //view model
    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.7.0")
    //hilt
    implementation("androidx.hilt:hilt-navigation-compose:1.1.0-alpha01")
    //coil
    implementation("io.coil-kt:coil-compose:2.6.0")

    testImplementation("junit:junit:4.13.2")
    androidTestImplementation("androidx.test.ext:junit:1.1.5")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
    androidTestImplementation(platform("androidx.compose:compose-bom:2024.02.02"))

    // compose test
    androidTestImplementation("androidx.compose.ui:ui-test-junit4")
    debugImplementation("androidx.compose.ui:ui-tooling")
    debugImplementation("androidx.compose.ui:ui-test-manifest")

    // constrains layout
    implementation ("androidx.constraintlayout:constraintlayout-compose:1.0.1")
}

2. 指定兼容的Kotlin版本 #

在项目根目录的build.gradle中，明确指定与Compose Compiler 1.5.1兼容的Kotlin版本（1.9.20）：

plugins {
    id("com.android.application") version "8.2.2" apply false
    id("org.jetbrains.kotlin.android") version "1.9.20" apply false
}

3. 清理并重建项目 #

• 打开Android Studio，点击File -> Invalidate Caches...，选择Invalidate and Restart。
• 重启后，依次执行Build -> Clean Project、Build -> Rebuild Project。

4. 重新下载源码 #

项目重建完成后，再次打开目标Compose类，点击「Download resources」，Gradle即可正确解析依赖并下载源码。

内容的提问来源于stack exchange，提问作者Ahmed Abdelnaser