仅从Android N开始支持默认接口方法 [英] Default interface methods are only supported starting with Android N

问题描述

我已升级到android studio 3.1，但出现以下错误:

I upgraded to android studio 3.1 and I'm getting the following error:

    Default interface methods are only supported starting with Android N (--min-api 24): void android.arch.lifecycle.DefaultLifecycleObserver.onCreate(android.arch.lifecycle.LifecycleOwner)
Message{kind=ERROR, text=Default interface methods are only supported starting with Android N (--min-api 24): void android.arch.lifecycle.DefaultLifecycleObserver.onCreate(android.arch.lifecycle.LifecycleOwner), sources=[Unknown source file], tool name=Optional.of(D8)}

这是我的gradle配置:

here is my gradle config:

compileSdkVersion 27
//buildToolsVersion '27.0.3'
defaultConfig {
    minSdkVersion 16
    targetSdkVersion 27
     multiDexEnabled true
     //...
   }

如您所见，我的目标是27，已经比它抱怨的24领先.我应该怎么做才能解决此问题?如果我改用1.8 Java，会不会有很多客户?为什么在升级android studio之前没有得到这个错误?

As you can see, I am targeting 27 which is already ahead of 24 that its complaining about. What exactly should I do to fix this? If I change to 1.8 java, won't I be missing a lot of customers? Why was I not getting this error before I upgraded android studio?

我不知道这是否与我最近放入的LifecycleObserver类有关，它在kotlin中，现在我将其更改为java，但在清理项目后仍然遇到相同的错误:

I do not know if this is about the LifecycleObserver class I recently put in, it was in kotlin and now I changed it to java but still get the same error after cleaning project:

    public class LifeCycleAwareObserver implements LifecycleObserver {

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public void  onAppBackgrounded() {
        AnalyticsUtils.trackStartSession(true);
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    public void onAppForegrounded() {
        AnalyticsUtils.trackStartSession(false);
    }
}

如何跟踪错误的出处，以便我进行修复?

How to trace where the error is coming from so I can fix it?

这是我的版本依赖性:

project.ext {

        firebase_version = '12.0.0'

        supportlib_version = '27.0.2'

        room_version = '1.0.0'

        espresso_version = '3.0.1'

        archLifecycleVersion = '1.1.1'
    }

推荐答案

正如CommonsWare所述，作为参考，请将其添加到build.gradle的android {...}闭包内，以解决您的应用模块问题:

As CommonsWare mentioned, for reference add this inside the android {...} closure in the build.gradle for your app module to resolve issue:

android {
...
  compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
...
}

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