android studio error：默认接口方法仅支持从Android N开始（--min-api 24） [英] android studio error: Default interface methods are only supported starting with Android N (--min-api 24)

问题描述

我升级到android studio 3.1并且我得到以下错误：

 默认接口方法仅支持从Android N开始（--min-api 24）：void android.arch.lifecycle.DefaultLifecycleObserver.onCreate（android.arch.lifecycle.LifecycleOwner）
消息{kind = ERROR，text =默认接口方法仅支持从Android N开始（--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：

  compileSdkVersion 27 
 // buildToolsVersion '27 .0.3'
 defaultConfig {
 minSdkVersion 16 
 targetSdkVersion 27 
 multiDexEnabled true 
 // ... 
} 
  

你可以看到我的目标是27已经是在它抱怨的24之前？我该怎么做才能解决这个问题？如果我改为1.8 java，我会失去很多客户吗？为什么我在升级android studio之前没有收到此错误。

我不知道这是关于我最近投入的LifecycleObserver类，它是在kotlin中，现在我把它更改为java但是在清理后仍然得到相同的错误project：

  public class LifeCycleAwareObserver实现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？

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'
} 
  

解决方案

如CommonsWare所述，作为参考，在<$你可以在build.gradle中使用c $ c> android {...} 关闭来解决问题：

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

i upgraded to android studio 3.1 and im 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)}

here is my gradle config:

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

as you can see i am targetting 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 wont i be missing alot of customers ? why was i not getting this error before i upgraded android studio.

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);
}

}

how to trace where the error is coming from so i can fix it ?

here are my my version dependencies:

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'
    }

解决方案

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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