Android Studio: Extension Methods are not supported at this language level -


the following code produced error "extension methods not supported @ language level" in android studio:

public interface test {  static string test2(string a) {     return "";     } }

as 2.0 beta 2

what have done wrong?

you're trying use static interface method, feature new in java 8. not supported in android until android n. more information see use java 8 language features form android guides.

still there's bug moment.

you have use java 8 compile following mentioned instructions. here's example of build.gradle:

apply plugin: 'com.android.application'  android {     compilesdkversion 'android-n'     buildtoolsversion "24.0.0-rc3"      defaultconfig {         applicationid "example.com.examplejdk8"         minsdkversion 24         targetsdkversion 'n'         versioncode 1         versionname "1.0"         jackoptions {             enabled true         }     }     compileoptions {         sourcecompatibility javaversion.version_1_8         targetcompatibility javaversion.version_1_8     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile filetree(dir: 'libs', include: ['*.jar'])     testcompile 'junit:junit:4.12'     compile 'com.android.support:appcompat-v7:24.0.0-alpha2'     compile 'com.android.support:design:24.0.0-alpha2' }

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