仅从 Android 7.0 (Nougat) 开始支持默认接口方法 [英] Default interface methods are only supported starting with Android 7.0 (Nougat)

问题描述

我升级到 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:

默认接口方法仅支持从 Android N (--min-api 24) 开始: void android.arch.lifecycle.DefaultLifecycleObserver.onCreate(android.arch.lifecycle.LifecycleOwner)

Message{kind=ERROR, text=默认接口方法仅支持从 Android N (--min-api 24) 开始: void android.arch.lifecycle.DefaultLifecycleObserver.onCreate(android.arch.lifecycle.LifecycleOwner), sources=[未知源文件]，工具名称=Optional.of(D8)}

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 configuration:

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

如您所见，我的目标是 27，这已经超过了它所抱怨的 24.我到底应该怎么做才能解决这个问题?如果我换成1.8 Java，会不会流失很多客户?为什么我在升级 Android Studio 之前没有收到此错误?

As you can see, I am targeting 27 which is already ahead of 24 that it's 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?

我不知道这是不是我最近放入的 LifecycleObserver 类.它是在 Kotlin 中的，现在我将其更改为 Java，但清理项目后仍然出现相同的错误:

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 I still get the same error after cleaning the 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);
    }
}

如何追踪错误的来源以便我可以修复它?

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

这是我的版本依赖项:

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

如CommonsWare 提到，在里面添加这个供参考在 build.gradle 中为您的应用模块(应用级别)添加 android {...} 闭包以解决问题:

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

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

这篇关于仅从 Android 7.0 (Nougat) 开始支持默认接口方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！