当我运行任何应用程序时，即使是在屏幕上显示“Hello world”的基本应用程序也无效。有人可以帮我弄清楚这一切意味着什么＆gt;。＆gt;非常感谢你。这发生在我的电脑上，在朋友的电脑上它根本就不会运行，我刚刚重新安装了android studio（但不是java JDK）
Configuration on demand is an incubating feature.
Relying on packaging to define the extension of the main artifact has been deprecated and is scheduled to be removed in Gradle 2.0
:app:preBuild
:app:compileDebugNdk UP-TO-DATE
:app:preDebugBuild
:app:checkDebugManifest
:app:preReleaseBuild
:app:prepareComAndroidSupportAppcompatV72000Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42000Library 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
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources
:app:generateDebugSources
:app:compileDebugJava UP-TO-DATE
:app:preDexDebug
unknown output extension: C:\Users\Rick\Documents\Spellbook\SpellbookD
usage:
dx --dex [--debug] [--verbose] [--positions=<style>] [--no-locals]
[--no-optimize] [--statistics] [--[no-]optimize-list=<file>] [--no-strict]
[--keep-classes] [--output=<file>] [--dump-to=<file>] [--dump-width=<n>]
unknown output extension: C:\Users\Rick\Documents\Spellbook\SpellbookD
usage:
dx --dex [--debug] [--verbose] [--positions=<style>] [--no-locals]
[--no-optimize] [--statistics] [--[no-]optimize-list=<file>] [--no-strict]
[--dump-method=<name>[*]] [--verbose-dump] [--no-files] [--core-library]
[--num-threads=<n>] [--incremental] [--force-jumbo]
[--multi-dex [--main-dex-list=<file> [--minimal-main-dex]]
[<file>.class | <file>.{zip,jar,apk} | <directory>] ...
Convert a set of classfiles into a dex file, optionally embedded in a
jar/zip. Output name must end with one of: .dex .jar .zip .apk or be a directory.
Positions options: none, important, lines.
--multi-dex: allows to generate several dex files if needed. This option is
exclusive with --incremental, causes --num-threads to be ignored and only
supports folder or archive output.
--main-dex-list=<file>: <file> is a list of class file names, classes defined by
those class files are put in classes.dex.
--minimal-main-dex: only classes selected by --main-dex-list are to be put in
the main dex.
dx --annotool --annotation=<class> [--element=<element types>]
[--print=<print types>]
dx --dump [--debug] [--strict] [--bytes] [--optimize]
[--basic-blocks | --rop-blocks | --ssa-blocks | --dot] [--ssa-step=<step>]
[--width=<n>] [<file>.class | <file>.txt] ...
Dump classfiles, or transformations thereof, in a human-oriented format.
dx --find-usages <file.dex> <declaring type> <member>
Find references and declarations to a field or method.
declaring type: a class name in internal form, like Ljava/lang/Object;
member: a field or method name, like hashCode
dx -J<option> ... <arguments, in one of the above forms>
Pass VM-specific options to the virtual machine that runs dx.
dx --version
Print the version of this tool (1.8).
dx --help
Print this message.
[--keep-classes] [--output=<file>] [--dump-to=<file>] [--dump-width=<n>]
[--dump-method=<name>[*]] [--verbose-dump] [--no-files] [--core-library]
[--num-threads=<n>] [--incremental] [--force-jumbo]
[--multi-dex [--main-dex-list=<file> [--minimal-main-dex]]
[<file>.class | <file>.{zip,jar,apk} | <directory>] ...
Convert a set of classfiles into a dex file, optionally embedded in a
jar/zip. Output name must end with one of: .dex .jar .zip .apk or be a directory.
Positions options: none, important, lines.
--multi-dex: allows to generate several dex files if needed. This option is
exclusive with --incremental, causes --num-threads to be ignored and only
supports folder or archive output.
--main-dex-list=<file>: <file> is a list of class file names, classes defined by
those class files are put in classes.dex.
--minimal-main-dex: only classes selected by --main-dex-list are to be put in
the main dex.
dx --annotool --annotation=<class> [--element=<element types>]
[--print=<print types>]
dx --dump [--debug] [--strict] [--bytes] [--optimize]
[--basic-blocks | --rop-blocks | --ssa-blocks | --dot] [--ssa-step=<step>]
[--width=<n>] [<file>.class | <file>.txt] ...
Dump classfiles, or transformations thereof, in a human-oriented format.
dx --find-usages <file.dex> <declaring type> <member>
Find references and declarations to a field or method.
declaring type: a class name in internal form, like Ljava/lang/Object;
member: a field or method name, like hashCode
dx -J<option> ... <arguments, in one of the above forms>
Pass VM-specific options to the virtual machine that runs dx.
dx --version
Print the version of this tool (1.8).
dx --help
Print this message.
The system cannot find the path specified.
The system cannot find the path specified.
The system cannot find the path specified.
FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:preDexDebug'.
> com.android.ide.common.internal.LoggedErrorException: Failed to run command:
C:\Users\Rick\AppData\Local\Android\android-studio1\sdk\build-tools\android-4.4W\dx.bat --dex --output C:\Users\Rick\Documents\Spellbook\SpellbookD&D5th\app\build\intermediates\pre-dexed\debug\support-annotations-20.0.0-0d853c27bd4d6b62d50991a94f330ee92c9660ea.jar C:\Users\Rick\AppData\Local\Android\android-studio1\sdk\extras\android\m2repository\com\android\support\support-annotations\20.0.0\support-annotations-20.0.0.jar
Error Code:
1
Output:
unknown output extension: C:\Users\Rick\Documents\Spellbook\SpellbookD
usage:
dx --dex [--debug] [--verbose] [--positions=<style>] [--no-locals]
[--no-optimize] [--statistics] [--[no-]optimize-list=<file>] [--no-strict]
[--keep-classes] [--output=<file>] [--dump-to=<file>] [--dump-width=<n>]
[--dump-method=<name>[*]] [--verbose-dump] [--no-files] [--core-library]
[--num-threads=<n>] [--incremental] [--force-jumbo]
[--multi-dex [--main-dex-list=<file> [--minimal-main-dex]]
[<file>.class | <file>.{zip,jar,apk} | <directory>] ...
Convert a set of classfiles into a dex file, optionally embedded in a
jar/zip. Output name must end with one of: .dex .jar .zip .apk or be a directory.
Positions options: none, important, lines.
--multi-dex: allows to generate several dex files if needed. This option is
exclusive with --incremental, causes --num-threads to be ignored and only
supports folder or archive output.
--main-dex-list=<file>: <file> is a list of class file names, classes defined by
those class files are put in classes.dex.
--minimal-main-dex: only classes selected by --main-dex-list are to be put in
the main dex.
dx --annotool --annotation=<class> [--element=<element types>]
[--print=<print types>]
dx --dump [--debug] [--strict] [--bytes] [--optimize]
[--basic-blocks | --rop-blocks | --ssa-blocks | --dot] [--ssa-step=<step>]
[--width=<n>] [<file>.class | <file>.txt] ...
Dump classfiles, or transformations thereof, in a human-oriented format.
dx --find-usages <file.dex> <declaring type> <member>
Find references and declarations to a field or method.
declaring type: a class name in internal form, like Ljava/lang/Object;
member: a field or method name, like hashCode
dx -J<option> ... <arguments, in one of the above forms>
Pass VM-specific options to the virtual machine that runs dx.
dx --version
Print the version of this tool (1.8).
dx --help
Print this message.
The system cannot find the path specified.
* 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: 23.0 secs
Executing tasks: [:app:assembleDebug]
Configuration on demand is an incubating feature.
Relying on packaging to define the extension of the main artifact has been deprecated and is scheduled to be removed in Gradle 2.0
:app:preBuild
:app:compileDebugNdk UP-TO-DATE
:app:preDebugBuild
:app:checkDebugManifest
:app:preReleaseBuild
:app:prepareComAndroidSupportAppcompatV72000Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42000Library 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
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources
:app:generateDebugSources
:app:compileDebugJava
:app:preDexDebug
unknown output extension: C:\Users\Rick\Documents\Spellbook\SpellbookD
usage:
dx --dex [--debug] [--verbose] [--positions=<style>] [--no-locals]
[--no-optimize] [--statistics] [--[no-]optimize-list=<file>] [--no-strict]
[--keep-classes] [--output=<file>] [--dump-to=<file>] [--dump-width=<n>]
[--dump-method=<name>[*]] [--verbose-dump] [--no-files] [--core-library]
[--num-threads=<n>] [--incremental] [--force-jumbo]
[--multi-dex [--main-dex-list=<file> [--minimal-main-dex]]
[<file>.class | <file>.{zip,jar,apk} | <directory>] ...
Convert a set of classfiles into a dex file, optionally embedded in a
jar/zip. Output name must end with one of: .dex .jar .zip .apk or be a directory.
Positions options: none, important, lines.
--multi-dex: allows to generate several dex files if needed. This option is
exclusive with --incremental, causes --num-threads to be ignored and only
supports folder or archive output.
--main-dex-list=<file>: <file> is a list of class file names, classes defined by
those class files are put in classes.dex.
--minimal-main-dex: only classes selected by --main-dex-list are to be put in
the main dex.
dx --annotool --annotation=<class> [--element=<element types>]
[--print=<print types>]
dx --dump [--debug] [--strict] [--bytes] [--optimize]
[--basic-blocks | --rop-blocks | --ssa-blocks | --dot] [--ssa-step=<step>]
[--width=<n>] [<file>.class | <file>.txt] ...
Dump classfiles, or transformations thereof, in a human-oriented format.
dx --find-usages <file.dex> <declaring type> <member>
Find references and declarations to a field or method.
declaring type: a class name in internal form, like Ljava/lang/Object;
member: a field or method name, like hashCode
dx -J<option> ... <arguments, in one of the above forms>
Pass VM-specific options to the virtual machine that runs dx.
dx --version
Print the version of this tool (1.8).
dx --help
unknown output extension: C:\Users\Rick\Documents\Spellbook\SpellbookD
usage:
dx --dex [--debug] [--verbose] [--positions=<style>] [--no-locals]
[--no-optimize] [--statistics] [--[no-]optimize-list=<file>] [--no-strict]
[--keep-classes] [--output=<file>] [--dump-to=<file>] [--dump-width=<n>]
[--dump-method=<name>[*]] [--verbose-dump] [--no-files] [--core-library]
[--num-threads=<n>] [--incremental] [--force-jumbo]
[--multi-dex [--main-dex-list=<file> [--minimal-main-dex]]
[<file>.class | <file>.{zip,jar,apk} | <directory>] ...
Convert a set of classfiles into a dex file, optionally embedded in a
jar/zip. Output name must end with one of: .dex .jar .zip .apk or be a directory.
Positions options: none, important, lines.
--multi-dex: allows to generate several dex files if needed. This option is
exclusive with --incremental, causes --num-threads to be ignored and only
supports folder or archive output.
--main-dex-list=<file>: <file> is a list of class file names, classes defined by
those class files are put in classes.dex.
--minimal-main-dex: only classes selected by --main-dex-list are to be put in
the main dex.
dx --annotool --annotation=<class> [--element=<element types>]
[--print=<print types>]
dx --dump [--debug] [--strict] [--bytes] [--optimize]
[--basic-blocks | --rop-blocks | --ssa-blocks | --dot] [--ssa-step=<step>]
[--width=<n>] [<file>.class | <file>.txt] ...
Dump classfiles, or transformations thereof, in a human-oriented format.
dx --find-usages <file.dex> <declaring type> <member>
Find references and declarations to a field or method.
declaring type: a class name in internal form, like Ljava/lang/Object;
member: a field or method name, like hashCode
dx -J<option> ... <arguments, in one of the above forms>
Pass VM-specific options to the virtual machine that runs dx.
dx --version
Print the version of this tool (1.8).
dx --help
Print this message.
Print this message.
The system cannot find the path specified.
The system cannot find the path specified.
FAILED
The system cannot find the path specified.
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:preDexDebug'.
> com.android.ide.common.internal.LoggedErrorException: Failed to run command:
C:\Users\Rick\AppData\Local\Android\android-studio1\sdk\build-tools\android-4.4W\dx.bat --dex --output C:\Users\Rick\Documents\Spellbook\SpellbookD&D5th\app\build\intermediates\pre-dexed\debug\classes-cb3d2cfea94b9f5266afe2f7149823e33a7f9188.jar C:\Users\Rick\Documents\Spellbook\SpellbookD&D5th\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\20.0.0\classes.jar
Error Code:
1
Output:
unknown output extension: C:\Users\Rick\Documents\Spellbook\SpellbookD
usage:
dx --dex [--debug] [--verbose] [--positions=<style>] [--no-locals]
[--no-optimize] [--statistics] [--[no-]optimize-list=<file>] [--no-strict]
[--keep-classes] [--output=<file>] [--dump-to=<file>] [--dump-width=<n>]
[--dump-method=<name>[*]] [--verbose-dump] [--no-files] [--core-library]
[--num-threads=<n>] [--incremental] [--force-jumbo]
[--multi-dex [--main-dex-list=<file> [--minimal-main-dex]]
[<file>.class | <file>.{zip,jar,apk} | <directory>] ...
Convert a set of classfiles into a dex file, optionally embedded in a
jar/zip. Output name must end with one of: .dex .jar .zip .apk or be a directory.
Positions options: none, important, lines.
--multi-dex: allows to generate several dex files if needed. This option is
exclusive with --incremental, causes --num-threads to be ignored and only
supports folder or archive output.
--main-dex-list=<file>: <file> is a list of class file names, classes defined by
those class files are put in classes.dex.
--minimal-main-dex: only classes selected by --main-dex-list are to be put in
the main dex.
dx --annotool --annotation=<class> [--element=<element types>]
[--print=<print types>]
dx --dump [--debug] [--strict] [--bytes] [--optimize]
[--basic-blocks | --rop-blocks | --ssa-blocks | --dot] [--ssa-step=<step>]
[--width=<n>] [<file>.class | <file>.txt] ...
Dump classfiles, or transformations thereof, in a human-oriented format.
dx --find-usages <file.dex> <declaring type> <member>
Find references and declarations to a field or method.
declaring type: a class name in internal form, like Ljava/lang/Object;
member: a field or method name, like hashCode
dx -J<option> ... <arguments, in one of the above forms>
Pass VM-specific options to the virtual machine that runs dx.
dx --version
Print the version of this tool (1.8).
dx --help
Print this message.
The system cannot find the path specified.
The system cannot find the path specified.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
答案 0 :(得分：0)
检查项目属性菜单中的sdk路径和其他属性。
应该正确提供SDK路径。
如果您最近完成升级，它也可能会起作用。检查一次。
并检查res文件一次。如果有任何错误，则构建不成功。
如果一切正常，请清理项目。并再次运行