在2019年最新的Android Studio 3.4+上，上述所有解决方案似乎都不起作用。

我想出了一个完美的和最新的解决方案，将您的Android项目迁移或升级到Java 8。

解决方案: 点击文件->项目结构->模块->属性选项卡。 将源兼容性和目标兼容性更改为1.8 (Java 8)

Android使用的Java是Java 6的分支。

从Android SDK版本19开始，您可以通过这样做来使用Java 7特性。目前还没有完全支持Java 8。

添加Java 8支持的最简单方法

 compileOptions {
    targetCompatibility = '1.8'
    sourceCompatibility = '1.8'
 }

只需将其添加到您的构建中。gradle文件。

容易记住的答案

在android studio中，单击项目结构图标，然后进入模块/应用程序，然后将源兼容性和目标兼容性更改为1.8，然后按Ok。

更新2017/11/04 - Android Studio 3.0现在支持Java 8。Gradle-retrolambda现在不再需要了。参见https://developer.android.com/studio/write/java8-support.html

如果您正在使用gradle-retrolambda，上面的链接还包括迁移指令。原答案如下:

Android不支持Java 8。它只支持到Java 7(如果你有kitkat)，它仍然没有invokedynamic，只有新的语法sugar。

If you want to use lambdas, one of the major features of Java 8 in Android, you can use gradle-retrolamba. It's a gradle build dependency that integrates retrolambda, a tool that converts Java 8 bytecode back to Java 6/7. Basically, if you set the compiler in Android Studio to compile Java 8 bytecode, thus allowing lambdas, it'll convert it back to Java 6/7 bytecode which then in turn gets converted to dalvik bytecode. It's a hack for if you want to try out some JDK 8 features in Android in lieu of official support.

Android在Android N正式支持Java 8。

特性公告如下，Java 8语言公告如下:

Improved Java 8 language support - We’re excited to bring Java 8 language features to Android. With Android's Jack compiler, you can now use many popular Java 8 language features, including lambdas and more, on Android versions as far back as Gingerbread. The new features help reduce boilerplate code. For example, lambdas can replace anonymous inner classes when providing event listeners. Some Java 8 language features --like default and static methods, streams, and functional interfaces -- are also now available on N and above. With Jack, we’re looking forward to tracking the Java language more closely while maintaining backward compatibility.