我在我的 Android 项目中使用 Java 8。我已经设置了 Jack（在 android 应用程序模块中）和 Retrolambda（在其他模块中）。
我遇到的问题是，当我尝试使其使用类变量（并且我可以在任何模块中重现它）时，我的 Lambda 表达式在一种特定情况下崩溃，而在所有其他情况下它都按预期工作。也许这是标准的 Java 行为，但到目前为止我找不到任何解释。有谁知道问题出在哪里吗？
我的课程和崩溃如下：
public class LambdaBugTest {
private final String parentClassVariableString = "parentClassVariableString";
public void testLambdas() {
// ----------- THESE WORK OK --------------
final Functional simpleLambdaWorks = text -> System.out.print(text);
final Functional methodReferenceWorks = System.out::print;
final Functional interfaceWithClassParamWorks = new Functional() {
@Override
public void doSomething(String text) {
System.out.print(text + " " + parentClassVariableString);
}
};
// -----------------------------------------
// ----------- THIS ONE CRASHES ------------
final Functional lambdaWithClassParamCrashes = text -> System.out.print(text + " " + parentClassVariableString);
// -----------------------------------------
simpleLambdaWorks.doSomething("Text from simpleLambdaWorks");
methodReferenceWorks.doSomething("Text from methodReferenceWorks");
interfaceWithClassParamWorks.doSomething("Text from interfaceWithClassParamWorks");
lambdaWithClassParamCrashes.doSomething("Text from lambdaWithClassParamCrashes");
}
private interface Functional {
void doSomething(String text);
}
}
崩溃日志：
08-21 00:27:41.564 25752-25752/debug E/AndroidRuntime: FATAL EXCEPTION: main
Process: debug, PID: 25752
java.lang.IncompatibleClassChangeError: The method 'void data.api.mapper.LambdaBugTest.data_api_mapper_LambdaBugTest_lambda$testLambdas$1(java.lang.String)' was expected to be of type direct but instead was found to be of type virtual (declaration of 'java.lang.reflect.ArtMethod' appears in /system/framework/core-libart.jar)
at data.api.mapper.LambdaBugTest.access$lambda$1(LambdaBugTest.java)
at data.api.mapper.LambdaBugTest$$Lambda$5.doSomething(Unknown)
at data.api.mapper.LambdaBugTest.testLambdas(LambdaBugTest.java:27)
at home.presentation.HomeActivity.onCreate(HomeActivity.java:47)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Google 不再支持 android-jack。
Jack 不再受支持，您应该首先禁用 Jack 以使用默认工具链中内置的 Java 8 支持
Android Studio 3.0 及更高版本支持 Lambdas 表达式。配置build.gradle文件：
android {
...
// Configure only for each module that uses Java 8
// language features (either in its source code or
// through dependencies).
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
}
注意：如果 Android Studio 检测到您的项目正在使用 Jack、Retrolambda 或 DexGuard，则 IDE 将改用这些工具提供的 Java 8 支持。但是，请考虑迁移到默认工具链
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