Question

我昨晚花了几个小时试图让我的项目在 Android Studio 1.2 RC 3 上使用 JDK 1.7 进行实际编译。

我通过本网站上的几篇不同文章和其他有类似问题的人阅读，我尝试了他们提供的解决方案，例如将项目的字节码版本设置为1.7，我也设置我的项目源兼容性＆amp; 目标兼容性至1.7。

但我仍然遇到以下错误：

Information:Gradle tasks [:android:assembleDebug]
:android:preBuild UP-TO-DATE
:android:preDebugBuild UP-TO-DATE
:android:checkDebugManifest
:android:preReleaseBuild UP-TO-DATE
:core:compileJava
Warning:[options] bootstrap class path not set in conjunction with -source 1.6
 F:\MyProjects\Puzzle Pebbles\core\src\com\mtpmstudios\puzzlepebbles\Pebble.java
 Error:(27, 16) error: strings in switch are not supported in -source 1.6
 (use -source 7 or higher to enable strings in switch)
 Error:(54, 16) error: strings in switch are not supported in -source 1.6
(use -source 7 or higher to enable strings in switch)
1 warning
Error:Execution failed for task ':core:compileJava'.
> Compilation failed; see the compiler error output for details.
Information:BUILD FAILED
Information:Total time: 6.506 secs
Information:3 errors
Information:1 warning
Information:See complete output in console

我真的很感激我对这个问题的任何见解。谢谢。

更新

这是 build.gradle 文件：

    android {
    buildToolsVersion '21.1.2'
    compileSdkVersion 21

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            aidl.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            res.srcDirs = ['res']
            assets.srcDirs = ['assets']
        }

        instrumentTest.setRoot('tests')
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}
// needed to add JNI shared libraries to APK when compiling on CLI
tasks.withType(com.android.build.gradle.tasks.PackageApplication) { pkgTask ->
    pkgTask.jniFolders = new HashSet<File>()
    pkgTask.jniFolders.add(new File(projectDir, 'libs'))
}
// called every time gradle gets executed, takes the native dependencies of
// the natives configuration, and extracts them to the proper libs/ folders
// so they get packed with the APK.
task copyAndroidNatives() {
    file("libs/armeabi/").mkdirs();
    file("libs/armeabi-v7a/").mkdirs();
    file("libs/x86/").mkdirs();

    configurations.natives.files.each { jar ->
        def outputDir = null
        if (jar.name.endsWith("natives-armeabi-v7a.jar")) outputDir = file("libs/armeabi-v7a")
        if (jar.name.endsWith("natives-armeabi.jar")) outputDir = file("libs/armeabi")
        if (jar.name.endsWith("natives-x86.jar")) outputDir = file("libs/x86")
        if (outputDir != null) {
            copy {
                from zipTree(jar)
                into outputDir
                include "*.so"
            }
        }
    }
}
task run(type: Exec) {
    def path
    def localProperties = project.file("../local.properties")
    if (localProperties.exists()) {
        Properties properties = new Properties()
        localProperties.withInputStream { instr ->
            properties.load(instr)
        }
        def sdkDir = properties.getProperty('sdk.dir')
        if (sdkDir) {
            path = sdkDir
        } else {
            path = "$System.env.ANDROID_HOME"
        }
    } else {
        path = "$System.env.ANDROID_HOME"
    }

    def adb = path + "/platform-tools/adb"
    commandLine "$adb", 'shell', 'am', 'start', '-n', 'com.mtpmstudios.puzzlepebbles.android/com.mtpmstudios.puzzlepebbles.android.AndroidLauncher'
}
// sets up the Android Eclipse project, using the old Ant based build.
eclipse {
    // need to specify Java source sets explicitely, SpringSource Gradle Eclipse plugin
    // ignores any nodes added in classpath.file.withXml
    sourceSets {
        main {
            java.srcDirs "src", 'gen'
        }
    }

    jdt {
        sourceCompatibility = 1.7
        targetCompatibility = 1.7
    }

    classpath {
        plusConfigurations += [project.configurations.compile]
        containers 'com.android.ide.eclipse.adt.ANDROID_FRAMEWORK', 'com.android.ide.eclipse.adt.LIBRARIES'
    }

    project {
        name = appName + "-android"
        natures 'com.android.ide.eclipse.adt.AndroidNature'
        buildCommands.clear();
        buildCommand "com.android.ide.eclipse.adt.ResourceManagerBuilder"
        buildCommand "com.android.ide.eclipse.adt.PreCompilerBuilder"
        buildCommand "org.eclipse.jdt.core.javabuilder"
        buildCommand "com.android.ide.eclipse.adt.ApkBuilder"
    }
}
// sets up the Android Idea project, using the old Ant based build.
idea {
    module {
        sourceDirs += file("src");
        scopes = [COMPILE: [plus: [project.configurations.compile]]]

        iml {
            withXml {
                def node = it.asNode()
                def builder = NodeBuilder.newInstance();
                builder.current = node;
                builder.component(name: "FacetManager") {
                    facet(type: "android", name: "Android") {
                        configuration {
                            option(name: "UPDATE_PROPERTY_FILES", value: "true")
                        }
                    }
                }
            }
        }
    }
}
dependencies {
}

repositories {
    mavenCentral()
    mavenLocal()
}

Answer 1

我假设您必须在IDE上创建项目，最初是抱怨JDK1.6。我在这里找到的问题是在您的构建脚本中。如果您安装了多个JDK，并且如果您动态尝试更改项目的Java版本，则编译器将优先考虑当前项目所在的Java版本。

在访问安装了JDK7和JDK8的JavaFX 8组件时，我遇到了同样的问题。（我以前的项目是以1.7作为目标平台创建的）

您可以通过在IDE中创建一个目标JDK版本为1.7或更高版本的新项目，然后将所有源文件从之前的项目复制到新创建的项目路径来解决此问题。在这种情况下，IDE创建的构建脚本现在将指向JDK 7。

错误：Android Studio 1.2 RC 3上的-source 1.6不支持switch中的字符串

1 个答案: