将字节码转换为dex的Android错误：原因：Dex无法解析版本52字节码

Question

我使用samsung knox sdk并更新knox版本（2.7.1）。尝试编译我的应用程序时出现此错误。

错误细节：

Error:Error converting bytecode to dex: Cause: Dex cannot parse version 52 byte code. This is caused by library dependencies that have been compiled using Java 8 or above. If you are using the 'java' gradle plugin in a library submodule add targetCompatibility = '1.7' sourceCompatibility = '1.7' to that submodule's build.gradle file. ...while parsing android/app/enterprise/knoxcustom/CustomDeviceManager.class

我gradle这个

apply plugin: 'com.android.model.application' 

model { 
    android { 
     compileSdkVersion 25 
     buildToolsVersion "25.0.2" 
     defaultConfig { 
      minSdkVersion.apiLevel 14 
      targetSdkVersion.apiLevel 25 
      versionCode 14 
      versionName "2.0.14" 
      multiDexEnabled true 
     } 

     compileOptions.with { 
      sourceCompatibility = JavaVersion.VERSION_1_7 
      targetCompatibility = JavaVersion.VERSION_1_7 
     } 

     ndk { 
      moduleName "samsung_custom" 
      ..... 
     } 

     buildTypes { 
      release { 
       minifyEnabled false 
       signingConfig = $("android.signingConfigs.sign") 
       proguardFiles.add(file('proguard-android.txt')) 
       proguardFiles.add(file('proguard-rules.txt')) 
      } 

      debug { 
       signingConfig = $("android.signingConfigs.sign") 
      } 
     } 

     productFlavors { 
      create("pro") { 
       applicationId = "com.xxxxxx" 
       signingConfig = $("android.signingConfigs.sign") 
       ndk.abiFilters.add("armeabi-v7a") 
      } 
      create("basic") { 
       applicationId = "com.xxxxx" 
       signingConfig = $("android.signingConfigs.sign") 
       ndk.abiFilters.add("armeabi-v7a") 
      } 
     } 
    } 

    /* 
    adroid.sourceSets { 
     main { 
      aidl.srcDirs = ['src/main/java'] 
     } 
    } 
    */ 

    android.lintOptions { 
     checkReleaseBuilds false 
     abortOnError false 
    } 

    android.packagingOptions { 
     pickFirst 'META-INF/services/javax.annotation.processing.Processor' 
     exclude 'META-INF/DEPENDENCIES.txt' 
     exclude 'META-INF/DEPENDENCIES' 
     exclude 'META-INF/dependencies.txt' 
     exclude 'META-INF/LICENSE.txt' 
     exclude 'META-INF/LICENSE' 
     exclude 'META-INF/license.txt' 
     exclude 'META-INF/LGPL2.1' 
     exclude 'META-INF/NOTICE.txt' 
     exclude 'META-INF/NOTICE' 
     exclude 'META-INF/notice.txt' 
    } 

    android.dexOptions { 
     incremental true 
     javaMaxHeapSize "4g" 
    } 
} 


dependencies { 
    compile fileTree(include: ['*.jar'], dir: 'libs') 
    compile 'com.android.support:appcompat-v7:25.2.0' 
    compile 'com.android.support:design:25.2.0' 
    compile 'com.android.support:cardview-v7:25.2.0' 
    compile 'com.jakewharton:butterknife:7.0.1' 
    compile 'joda-time:joda-time:2.9.4' 
    compile 'com.google.android.gms:play-services:10.2.0' 
    compile 'com.google.android.gms:play-services-gcm:10.2.0' 
    compile 'com.google.android.gms:play-services-location:10.2.0' 
    compile 'com.google.android.gms:play-services-plus:10.2.0' 
    compile(
      [group: 'com.fasterxml.jackson.core', name: 'jackson-core', version: '2.7.3'], 
      [group: 'com.fasterxml.jackson.core', name: 'jackson-annotations', version: '2.7.3'], 
      [group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.7.3'] 
    ) 
    compile 'com.squareup.retrofit2:converter-jackson:2.0.0' 
    compile 'com.squareup.retrofit2:retrofit:2.0.2' 
    // compile'com.squareup.retrofit2:converter-jackson:2.0.0' 
    // compile 'com.squareup.retrofit:converter-jackson:1.9.0' 
    compile 'com.squareup.okhttp3:okhttp:3.3.1' 
    compile 'com.github.johnkil.android-appmsg:appmsg:1.2.0' 
    compile 'me.zhanghai.android.materialprogressbar:library:1.1.6' 
    compile('com.github.afollestad.material-dialogs:core:0.8.5.8@aar') { 
     transitive = true 
    } 
    compile 'com.github.nisrulz:easydeviceinfo:1.1.9' 
    compile 'com.android.support:multidex:1.0.1' 
    compile project(':projects:wifiConnecter') 

    compile project(':projects:knoxActivator') 
    provided files('libs/cdm.jar') 
    provided files('libs/edm.jar') 
    provided files('libs/knox.jar') 
    provided files('libs/license.jar') 
    provided files('libs/rc.jar') 
} 

我加入compileOptions但再次得到一个异常。 你能帮我吗？

Answer 1

你改变

compileOptions.with { 
      sourceCompatibility = JavaVersion.VERSION_1_7 
      targetCompatibility = JavaVersion.VERSION_1_7 
     } 

到

compileOptions { 
     sourceCompatibility JavaVersion.VERSION_1_8 
     targetCompatibility JavaVersion.VERSION_1_8 
    }