Question

将我的第一个Kotlin代码（一项新活动）介绍到已建立的Android应用中。使用Android Studio 2.3.3，Gradle 3.3。我能够构建和运行应用程序，但在启动新的Kotlin活动时，应用程序崩溃，找不到类。分析APK表明Kotlin类没有被包含在dex中（其多语言，已经检查了两个dex文件）。

build.gradle（project）

buildscript {
    ext.kotlin_version = '1.1.4'
    repositories {
        jcenter()
        maven { url 'https://maven.fabric.io/public' }
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
        classpath 'com.google.gms:google-services:3.0.0'

        classpath 'com.github.triplet.gradle:play-publisher:1.1.4'
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

        classpath 'io.fabric.tools:gradle:1.+'
        classpath 'me.tatarka:gradle-retrolambda:3.2.5'
        classpath 'com.getkeepsafe.dexcount:dexcount-gradle-plugin:0.2.1'

        // For automated ui testing
        classpath 'com.stanfy.spoon:spoon-gradle-plugin:1.2.2'

        // For Amazon Device Farm
        classpath 'com.amazonaws:aws-devicefarm-gradle-plugin:1.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
        jcenter()
        maven { url 'http://dl.bintray.com/optimizely/optimizely' }
        maven { url "https://jitpack.io" }
        maven { url "http://salesforce-marketingcloud.github.io/JB4A-SDK-Android/repository" }
        flatDir {
            dirs 'libs'
        }
    }
}

build.gradle（app module）

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'io.fabric'
apply plugin: 'me.tatarka.retrolambda'
apply plugin: 'jacoco'
apply plugin: 'spoon'
repositories {
    mavenCentral()
    maven { url 'https://maven.fabric.io/public' }
    maven { url 'http://salesforce-marketingcloud.github.io/JB4A-SDK-Android/repository' }
    maven { url "https://maven.google.com" }
    maven { url "http://maven.tealiumiq.com/android/releases/" }
}
android {
    compileSdkVersion 25
    buildToolsVersion '25.0.0'

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        targetSdkVersion 25

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        // Enabling multidex support. :(
        multiDexEnabled true

    }

    dexOptions {
        javaMaxHeapSize "8g"
        dexInProcess true // the magic line
    }


    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
        compileOptions.incremental = false
    }
}
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])

    //include our modules
    compile project(':core')
    compile project(':data')

    //android
    final APP_COMPAT_VERSION = '25.4.0'
    compile "com.android.support:appcompat-v7:$APP_COMPAT_VERSION"
    compile "com.android.support:recyclerview-v7:$APP_COMPAT_VERSION"
    compile "com.android.support:design:$APP_COMPAT_VERSION"
    compile "com.android.support:multidex:1.0.0"
    compile "com.android.support:cardview-v7:$APP_COMPAT_VERSION"

    // google
    final PLAY_SERVICES_VERSION = '10.2.4'
    compile "com.google.android.gms:play-services-wallet:$PLAY_SERVICES_VERSION"
    compile "com.google.android.gms:play-services-location:$PLAY_SERVICES_VERSION"
    compile "com.google.android.gms:play-services-gcm:$PLAY_SERVICES_VERSION"
    compile "com.google.android.gms:play-services-plus:$PLAY_SERVICES_VERSION"
    compile "com.google.android.gms:play-services-identity:$PLAY_SERVICES_VERSION"
    compile "com.google.android.gms:play-services-analytics:$PLAY_SERVICES_VERSION"
    compile "com.google.android.gms:play-services-auth:$PLAY_SERVICES_VERSION"
    compile "com.google.android.gms:play-services-maps:$PLAY_SERVICES_VERSION"

    compile "org.jetbrains.kotlin:kotlin-stdlib"
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"


    androidTestCompile jUnit

    // Unit tests dependencies
    testCompile jUnit
    testCompile "org.hamcrest:hamcrest-core:$HAMCREST_VERSION"
    testCompile "org.hamcrest:hamcrest-library:$HAMCREST_VERSION"
    testCompile "org.hamcrest:hamcrest-integration:$HAMCREST_VERSION"
    testCompile 'org.robolectric:robolectric:3.1'
    testCompile 'org.mockito:mockito-core:1.+'
    testCompile 'com.google.guava:guava:19.0'
    testCompile("com.android.support:support-v4:$APP_COMPAT_VERSION") {
        exclude module: 'support-annotations'
    }
    testCompile('org.powermock:powermock-api-mockito:1.6.4') {
        exclude module: 'objenesis'
    }
    testCompile('org.powermock:powermock-module-junit4:1.6.4') {
        exclude module: 'objenesis'
    }
    testCompile 'io.reactivex:rxandroid:1.0.1'
    testCompile 'io.reactivex:rxjava:1.1.0'

    // Espresso
    androidTestCompile('com.android.support.test:runner:0.5') {
        exclude module: 'support-annotations'
    }
    androidTestCompile('com.android.support.test:rules:0.5') {
        exclude module: 'support-annotations'
    }
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2') {
        exclude module: 'support-annotations'
    }
    androidTestCompile('com.android.support.test.espresso:espresso-intents:2.2.2') {
        exclude module: 'support-annotations'
    }
    androidTestCompile('com.android.support.test.espresso:espresso-web:2.2.2') {
        exclude module: 'support-annotations'
    }
    androidTestCompile('com.android.support.test.espresso:espresso-contrib:2.2.2') {
        exclude module: 'support-annotations'
        exclude module: 'recyclerview-v7'
        exclude module: 'appcompat-v7'
        exclude module: 'design'
        exclude module: 'support-v4'
    }

    // allows java 8 compile
    compile 'com.annimon:stream:1.1.2'

    uitestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.2'
    developmentCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.2'
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
}

和活动，这很简单：

class HyperFlashActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(hyperflash_activity_layout)
    }
}

和启动代码：

public static void launchHyperflashActivity(Activity launchingActivity) {
    Intent intent = new Intent(launchingActivity, HyperFlashActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    launchingActivity.startActivity(intent);
    launchingActivity.overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left);
}

Answer 1

我曾经遇到过同样的问题¹，基本上修复是代替Android Studio 2.x下载Android Studio 3.0 Beta。这应该可以解决您的问题，即使代码突出显示在使用2.x版本时也能正常工作。

当您查看“新功能”标签时，您可以看到features support for Kotlin language哪些类表示它之前缺少（我认为在这种情况下它只是内置于Android Studio和专门针对Android Studio的要求进行了增强（例如将类包含在dex文件中））。

¹：除了multidex，因为我不需要它

Kotlin活动不包括在APK中

1 个答案: