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

Question

昨晚我花了幾個小時試圖讓我的項目在Android Studio 1.2 RC 3上使用JDK 1.7進行實際編譯。

我通讀了該網站上的其他幾篇文章，以及遇到類似問題的人的其他文章，我嘗試了他們提供的解決方案，例如將項目的字節碼版本設置為1.7，還將項目的源兼容性和目標兼容性設置為1.7。

但是我仍然不斷收到以下錯誤：

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

我一直以來對這個問題有任何見解，我將不勝感激。 謝謝。

更新

這是我的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

我假設您必須先在IDE上創建項目，並且最初抱怨JDK1.6。 我在這里找到的問題在您的構建腳本中。 如果安裝了多個JDK，並且您動態地嘗試更改項目的Java版本，則編譯器將優先使用在其上創建當前項目的Java版本。

訪問同時安裝了JDK7和JDK8的JavaFX 8組件時，我遇到了相同的問題。 （我以前的項目是使用1.7作為目標平台創建的）

您可以通過以下方法解決此問題：在IDE中將目標JDK版本設置為1.7或更高版本創建一個新項目，然后將所有源文件從以前的項目復制到新創建的項目路徑。 您的IDE在這種情況下創建的構建腳本現在將指向JDK 7。