java错误转换

Question

这是我的身材。格拉德尔

apply plugin: 'com.安卓.application'

安卓 {
    compileSdkVersion 25
    buildToolsVersion "27.0.2"
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
    defaultConfig {
        applicationId "com.example.user2.trafficmap"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.1"
        testInstrumentationRunner "安卓.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-安卓.txt'), 'proguard-rules.pro'
        }
    }
}

repositories {
    mavenCentral()
    maven { url "https://maven.google.com" }
}

dependencies {

    sourceCompatibility = 1.7
    targetCompatibility = 1.7

    compile fileTree(include: ['*.jar'], dir: 'libs')
    安卓TestCompile('com.安卓.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.安卓.support', module: 'support-annotations'
    })
    compile group: 'io.nlopez.smartlocation', name: 'library', version: '3.3.1'

    compile 'com.安卓.support:appcompat-v7:25.3.1'
    compile 'com.google.安卓.gms:play-services-location:11.4.2'
    compile 'com.google.安卓.gms:play-services-base:11.4.2'
    compile 'com.google.安卓.gms:play-services-maps:11.4.2'
    compile 'com.github.arimorty:floatingsearchview:2.1.1'
    compile 'com.安卓.support.constraint:constraint-layout:1.0.2'
    compile ('com.schibstedspain.安卓:leku:3.6.2',{
        targetCompatibility = '1.8'
        sourceCompatibility = '1.8'
    })
    testCompile 'junit:junit:4.12'
}

我得到了这个错误

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.

我想将leku库添加到我的项目中，我遇到了这个问题 如何将目标和源兼容性添加到我的子模块

Answer 1

备选案文1

移动

sourceCompatibility = 1.7
targetCompatibility = 1.7

在dependencies之前

---

备选案文2

使用Android studio 3和java 8。更改构建工具

classpath 'com.android.tools.build:gradle:3.0.0'

及

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"

    defaultConfig {
        // ...        
    }
    dexOptions {
        incremental true
    }

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

Answer 2

手动将应用程序本身设置为在java 7上运行时，无法添加使用source compat设置为java 8的库。意思是：

compile ('com.schibstedspain.android:leku:3.6.2',{
    targetCompatibility = '1.8'
    sourceCompatibility = '1.8'
})

更改：

compile ('com.schibstedspain.android:leku:3.6.2',{
    targetCompatibility = '1.7'
    sourceCompatibility = '1.7'
})

请注意，如果库本身是用Java8编译的，那么这很可能不起作用

或者，使用Java 8编译应用程序：

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

如果您使用的是Android Studio<；你必须使用杰克。如果您使用的是Android Studio>；=3、不要用杰克。它是不需要的，而且不推荐使用

至于错误本身：

Error:Error converting bytecode to dex: Cause: Dex cannot parse version 52 byte code.

字节码版本与Java版本相关

This is caused by library dependencies that have been compiled using Java 8 or above.

'com.schibstedspain.android:leku:3.6.2'依赖项

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.

即用Java 7而不是Java 8编译库

由于这可能是由导入中的targetCompatibility部分引起的，因此将其更改为1.7应该可以解决这一问题。或者，在应用程序上使用Java8进行编译_{这样做不会丢失任何平台，它在（AFAIK）所有版本上都受支持。尽管有一些特定的Java8API，但它们只在Android的更高版本中可用。例如，在API 24之前未添加的流}