ADT 到 Android Studio 意外的顶级异常

Question

所以，我正在尝试将我的 Eclipse ADT 项目迁移到 Android Studio。我在 Eclipse 中使用 appcompat_v7 项目作为库项目。我按照 Android 开发网站上的说明进行操作，但仍然收到此错误：

Error:Execution failed for task :PaWPal:dexDebug.
com.android.ide.common.internal.LoggedErrorException: Failed to run command:
    /Users/godswood/Desktop/adt-bundle-mac-x86_64-20140321/sdk/build-tools/19.1.0/dx --dex --num-threads=4 --output /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/dex/debug /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/classes/debug /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/dependency-cache/debug /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/android-support-v13-7e8441dbe126e0c6ef27b0769fe1a7b51230f497.jar /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/android-support-v4-435683bcc81493f96c2a6911d0f2132f9185a3c8.jar /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/android-support-v7-appcompat-ce23957a305e187b582a49f3d7389771481d29a0.jar /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/classes-0df1e7b55f7a1cf804d7c324e4d8e5350156c424.jar /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/commons-lang3-3.3.2-414f8e20d93f4cd78deef61257feb20e410dc32e.jar /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/joda-time-2.3-e2f8ddd39c18a5b5f810a870e98c34e25539e6e9.jar /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/joda-time-2.3-javadoc-2b8389d156c40d0540abb1e521b4be4ba90b89b7.jar /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/joda-time-2.3-sources-ee3d5e4a6e2aceeeee41f9ab558b6a1430285670.jar /Users/godswood/Desktop/pawpal/PaWPal/build/intermediates/pre-dexed/debug/Parse-1.5.1-b7ce0ef98d2f79d618c5421f63a4845519bd4ced.jar
  Error Code:
    2
  Output:
    UNEXPECTED TOP-LEVEL EXCEPTION:
    com.android.dex.DexException: Multiple dex files define Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat$AccessibilityServiceInfoVersionImpl;
        at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:594)
        at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:552)
        at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:533)
        at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:170)
        at com.android.dx.merge.DexMerger.merge(DexMerger.java:188)
        at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:439)
        at com.android.dx.command.dexer.Main.runMonoDex(Main.java:287)
        at com.android.dx.command.dexer.Main.run(Main.java:230)
        at com.android.dx.command.dexer.Main.main(Main.java:199)
        at com.android.dx.command.Main.main(Main.java:103)

我的 Gradle 文件如下所示：

apply plugin: 'com.android.application'
configurations {
    all*.exclude group: 'com.android.support', module: 'support-v4'
}
dependencies {
    compile fileTree(dir: 'libs', include: '*.jar')
    compile project(':appcompat_v7')
}

android {
    compileSdkVersion 19
    buildToolsVersion "19.1.0"

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

        // Move the tests to tests/java, tests/res, etc...
        instrumentTest.setRoot('tests')

        // Move the build types to build-types/<type>
        // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
        // This moves them out of them default location under src/<type>/... which would
        // conflict with src/ being used by the main source set.
        // Adding new build types or product flavors should be accompanied
        // by a similar customization.
        debug.setRoot('build-types/debug')
        release.setRoot('build-types/release')
    }
}

如果您有任何想法，我很想听听。我知道这里有很多类似的问题，但没有一个解决方案对我有用（悲伤的脸）。

Answer 1

在 Android Studio 中，您不需要像在 Eclipse 中那样将 appcompat 库作为库项目包含在内。相反，将其添加到 模块 的构建文件的 dependencies 块中：

 compile 'com.android.support:appcompat-v7:XXXX.+'

其中XXXX 是您的compileSdkVersion。

另外，我怀疑您的 libs 文件夹中有 v4 支持库 jar 的副本（您在其中获得了多个定义的类）。如果像上面那样包含 appcompat 库，则根本不需要包含 support-v4； appcompat 依赖于它，构建系统会做正确的事情。所以继续从你的 libs 文件夹中删除那个 jar。