在 Android Java 应用程序中使用 Kotlin AAR 时出现 java.lang.NoClassDefFoundError

Question

我必须在 Kotlin 中制作一个库（aar），并且必须在使用 Java 制作的 Android 应用程序中使用它。Kotlin 库有一个带有配套函数的类，可以在 Java 应用程序中静态使用。当我在 Java 的 Android 应用程序中使用该静态方法时，我确实收到了“ClassNotFoundException”。任何人都可以帮助我如何在 Android Java 应用程序的 aar 中使用配套方法。请找到我的代码片段和运行我的应用程序时遇到的异常。并且只有在 Android Java 项目中使用 Kotlin AAR 而不是在 Android Kotlin 项目中使用时，我才会收到此错误。Kotlin 库或 Android Java 项目中是否缺少某些东西。Kotlin 库片段：

class LogUtil {
    companion object {
        private const val LOG_TAG = "KOTLIN_LIBRARY"
        @JvmStatic
        fun log(message: String) {
            Log.i(LOG_TAG, message)
        }
    }
}

Android 活动片段：

public class MainActivity extends AppCompatActivity {

    private HaloSDK haloSDK;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        testKotlinSDK();
    }


    private void testKotlinSDK() {
        LogUtil.log("Hello");
    }

    public void showKotlinWebView(View view) {
        Intent intent = HaloWebActivity.Companion.createIntent(this, "www.abc.com");
        startActivity(intent);
    }
}

例外：

java.lang.NoClassDefFoundError: Failed resolution of: Lkotlin/jvm/internal/Intrinsics;
        at com.abcd.kotlinlibrary.utils.LogUtil$Companion.log(Unknown Source:2)
        at com.abcd.kotlinlibrary.utils.LogUtil.log(Unknown Source:2)
        at com.abcd.thirdpartyapp.MainActivity.testKotlinSDK(MainActivity.java:25)
        at com.abcd.thirdpartyapp.MainActivity.onCreate(MainActivity.java:20)
        at android.app.Activity.performCreate(Activity.java:7174)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6940)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "kotlin.jvm.internal.Intrinsics" on path: DexPathList[[zip file "/data/app/com.abcd.thirdpartyapp-k2I71L3n7Qa6TEETe1GejQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.abcd.thirdpartyapp-k2I71L3n7Qa6TEETe1GejQ==/lib/arm64, /system/lib64, /system/vendor/lib64]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at com.abcd.kotlinlibrary.utils.LogUtil$Companion.log(Unknown Source:2) 
        at com.abcd.kotlinlibrary.utils.LogUtil.log(Unknown Source:2) 
        at com.abcd.thirdpartyapp.MainActivity.testKotlinSDK(MainActivity.java:25) 
        at com.abcd.thirdpartyapp.MainActivity.onCreate(MainActivity.java:20) 
        at android.app.Activity.performCreate(Activity.java:7174) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032) 
        at android.app.ActivityThread.-wrap11(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696) 
        at android.os.Handler.dispatchMessage(Handler.java:105) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6940) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) 

Answer 1

缺失的类是Kotlin 标准库的一部分。如果您的项目中没有使用Kotlin，则必须手动依赖它：

implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.2.50'

您还可以确保从库中导出依赖项：

api 'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.2.50'