我刚刚从Eclipse转移到令人生畏的Android Studio，遇到了一些问题，无法摆脱一个看起来相当常见的错误。
Error:Execution failed for task ':app:preDexDebug'.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/usr/lib/jvm/java-7-oracle/bin/java'' finished with non-zero exit value 1
我找遍了所有可能的解决方案，包括简单地重启我的开发工具、无效化和清除缓存、删除相关的JAR文件并尝试再次添加，但目前为止都没有生效。由于我对这个IDE非常陌生，因此我甚至不知道它是如何工作的以及构建文件应该长什么样子。
以下是我当前的build.gradle（Module：app）文件：
apply plugin: 'com.android.application'
android {
compileSdkVersion 21
buildToolsVersion "21.1.2"
defaultConfig {
applicationId "com.example.culami"
minSdkVersion 21
targetSdkVersion 21
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_7
targetCompatibility JavaVersion.VERSION_1_7
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
dependencies {
compile 'com.android.support:appcompat-v7:21.0.3'
compile 'com.android.support:support-v4:21.0.3'
compile files('libs/WebSocket.jar')
compile files('libs/android-support-v13.jar')
compile files('libs/json-org.jar')
compile files('libs/socketio.jar')
}
这个项目是从Eclipse导入的，原因是我在使用json-org.jar和WebSocket.jar时遇到了一些构建问题。我无法解决这个问题，问题仍然存在。我不确定如何通过gradle添加这些依赖项，因为github页面并没有提供明确的说明。
以下是Gradle控制台的输出结果。
Executing tasks: [:app:assembleDebug]
Configuration on demand is an incubating feature.
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:compileDebugNdk UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72103Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42103Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:compileDebugJava UP-TO-DATE
:app:preDexDebug UP-TO-DATE
:app:dexDebug
AGPBI: {"kind":"SIMPLE","text":"UNEXPECTED TOP-LEVEL EXCEPTION:","position":{},"original":"UNEXPECTED TOP-LEVEL EXCEPTION:"}
AGPBI: {"kind":"SIMPLE","text":"com.android.dex.DexException: Multiple dex files define Landroid/support/annotation/AnimRes;","position":{},"original":"com.android.dex.DexException: Multiple dex files define Landroid/support/annotation/AnimRes;"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:596)","position":{},"original":"\tat com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:596)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:554)","position":{},"original":"\tat com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:554)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:535)","position":{},"original":"\tat com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:535)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)","position":{},"original":"\tat com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.merge.DexMerger.merge(DexMerger.java:189)","position":{},"original":"\tat com.android.dx.merge.DexMerger.merge(DexMerger.java:189)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:454)","position":{},"original":"\tat com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:454)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.dexer.Main.runMonoDex(Main.java:303)","position":{},"original":"\tat com.android.dx.command.dexer.Main.runMonoDex(Main.java:303)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.dexer.Main.run(Main.java:246)","position":{},"original":"\tat com.android.dx.command.dexer.Main.run(Main.java:246)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.dexer.Main.main(Main.java:215)","position":{},"original":"\tat com.android.dx.command.dexer.Main.main(Main.java:215)"}
AGPBI: {"kind":"SIMPLE","text":"\tat com.android.dx.command.Main.main(Main.java:106)","position":{},"original":"\tat com.android.dx.command.Main.main(Main.java:106)"}
FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:dexDebug'.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/usr/lib/jvm/java-7-oracle/bin/java'' finished with non-zero exit value 2
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 23.247 secs
任何关于如何修复这个 preDexDebug 错误的帮助都将是极大的帮助！另外，我也无法在左侧的项目资源管理器中看到我的“libs”文件夹。