Error:Execution failed for task ':app:dexDebug'.

Error:Execution failed for task ':app:dexDebug'.

> com.android.ide.common.internal.LoggedErrorException: Failed to run command:

 D:\Android Eclipse 工具\sdk\build-tools\21.1.2\dx.bat --dex --no-optimize --output E:\CallPolice\app\build\intermediates\dex\debug --input-list=E:\CallPolice\app\build\intermediates\tmp\dex\debug\inputList.txt

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:596)

  at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:554)

  at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:535)

  at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)

  at com.android.dx.merge.DexMerger.merge(DexMerger.java:189)

  at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:454)

  at com.android.dx.command.dexer.Main.runMonoDex(Main.java:303)

  at com.android.dx.command.dexer.Main.run(Main.java:246)

  at com.android.dx.command.dexer.Main.main(Main.java:215)

  at com.android.dx.command.Main.main(Main.java:106)

解决方法： android-support-v4.jar被重复定义，删除build的中包配置文件中

    compile 'com.android.support:appcompat-v7:21.0.3'

    compile files('libs/android-support-v4.jar')

的    compile files('libs/android-support-v4.jar')

或者在代码中重新导入下包就可以了