报错信息如下：
1>Task "CompileToDalvik"
1> CompileToDalvik
1> JavaOptions:
1> JavaMaximumHeapSize: 1G
1> ClassesOutputDirectory: obj\Debug\android\bin\classes
1> JavaToolPath: D:\Java\jdk1.6.0_39\\bin
1> DxJarPath: F:\test\dev\resource\java\AndroidSDK\build-tools\android-4.2.2\\lib\dx.jar
1> ToolExe: java.exe
1> ToolPath:
1> UseDx: False
1> MultiDexEnabled: False
1> JavaLibrariesToCompile:
1> C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\MonoAndroid\v4.2\mono.android.jar
1> D:\Java\jdk1.6.0_39\\bin\java.exe -Xmx1G -jar F:\test\dev\resource\java\AndroidSDK\build-tools\android-4.2.2\\lib\dx.jar --no-strict --dex --output=obj\Debug\android\bin obj\Debug\android\bin\classes "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\MonoAndroid\v4.2\mono.android.jar"
1> unknown output extension: obj\Debug\android\bin
1> usage:
1> dx --dex [--debug] [--verbose] [--positions=<style>] [--no-locals]
1> [--no-optimize] [--statistics] [--[no-]optimize-list=<file>] [--no-strict]
1> [--keep-classes] [--output=<file>] [--dump-to=<file>] [--dump-width=<n>]
1> [--dump-method=<name>[*]] [--verbose-dump] [--no-files] [--core-library]
1> [--num-threads=<n>] [--incremental] [--force-jumbo]
1> [<file>.class | <file>.{zip,jar,apk} | <directory>] ...
1> Convert a set of classfiles into a dex file, optionally embedded in a
1> jar/zip. Output name must end with one of: .dex .jar .zip .apk. Positions
1> options: none, important, lines.
1> dx --annotool --annotation=<class> [--element=<element types>]
1> [--print=<print types>]
1> dx --dump [--debug] [--strict] [--bytes] [--optimize]
1> [--basic-blocks | --rop-blocks | --ssa-blocks | --dot] [--ssa-step=<step>]
1> [--width=<n>] [<file>.class | <file>.txt] ...
1> Dump classfiles, or transformations thereof, in a human-oriented format.
1> dx --find-usages <file.dex> <declaring type> <member>
1> Find references and declarations to a field or method.
1> declaring type: a class name in internal form, like Ljava/lang/Object;
1> member: a field or method name, like hashCode
1> dx -J<option> ... <arguments, in one of the above forms>
1> Pass VM-specific options to the virtual machine that runs dx.
1> dx --version
1> Print the version of this tool (1.7).
1> dx --help
1> Print this message.
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1662,3): error MSB6006: "java.exe" exited with code 1.
1> DexOutputs:
1>Done executing task "CompileToDalvik" -- FAILED.
1>Done building target "_CompileToDalvik" in project "App1.csproj" -- FAILED.
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:06.45
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========
Xamarin.Android.Common.targets(1661,3) 的内容是：
<!-- Compile java code to dalvik -->
<CompileToDalvik
DxJarPath="$(DxJarPath)"
JavaToolPath="$(JavaToolPath)"
JavaMaximumHeapSize="$(JavaMaximumHeapSize)"
JavaOptions="$(JavaOptions)"
ClassesOutputDirectory="$(IntermediateOutputPath)android\bin\classes"
ToolPath="$(DxToolPath)"
ToolExe="$(DxToolExe)"
UseDx="$(UseDx)"
MultiDexEnabled="$(AndroidEnableMultiDex)"
JavaLibrariesToCompile="@(_JavaLibrariesToCompile)"
OptionalObfuscatedJarFile="$(IntermediateOutputPath)proguard\__proguard_output__.jar"
/>
