我已经安装了使用Xamarin的2012年视觉工作室。我正确设置了JDK，sdk和ndk路径。我甚至将JAVA_HOME路径正确设置为jdk 1.7。当我尝试创建新的Android项目时，它给出了一个错误“对象引用未设置为对象的实例”。输出如下
[I:sdk]: Looking for Android SDK..
[I:sdk]: Key HKCU\SOFTWARE\Novell\Mono for Android\AndroidSdkDirectory not found.
[I:sdk]: Key HKLM\SOFTWARE\Novell\Mono for Android\AndroidSdkDirectory found:
Path does not contain adb.exe in \platform-tools (C:\android-sdk-windows).
[I:sdk]: Key HKCU\SOFTWARE\Xamarin\MonoAndroid\PrivateAndroidSdkPath not found.
[I:sdk]: Key HKCU\SOFTWARE\Android SDK Tools\Path not found.
[I:sdk]: Key HKLM\SOFTWARE\Android SDK Tools\Path found:
Path contains adb.exe in \platform-tools (C:\Users\Arnold\AppData\Local\Android\android-sdk).
[I:sdk]: Looking for Android NDK..
[I:sdk]: Key HKCU\SOFTWARE\Novell\Mono for Android\AndroidNdkDirectory found:
Path contains ndk-stack.exe in \. (C:\Users\Arnold\AppData\Local\Android\android-ndk).
[I:sdk]: Key HKLM\SOFTWARE\Novell\Mono for Android\AndroidNdkDirectory not found.
[I:sdk]: Key HKCU\SOFTWARE\Novell\Mono for Android\JavaSdkDirectory not found.
[I:sdk]: Key HKLM\SOFTWARE\Novell\Mono for Android\JavaSdkDirectory not found.
[I:sdk]: Looking for Java 6 SDK..
[I:sdk]: Key HKLM\SOFTWARE\JavaSoft\Java Development Kit\CurrentVersion found.
[I:sdk]: Key HKLM\SOFTWARE\JavaSoft\Java Development Kit\1.6\JavaHome not found.
[I:sdk]: Key HKLM\SOFTWARE\JavaSoft\Java Development Kit\1.7\JavaHome found:
Path contains jarsigner.exe in \bin (C:\Program Files (x86)\Java\jdk1.7.0_71).
[I:Unknown]: Found Android SDK. API levels: (none)
[I:Unknown]: Found Xamarin.Android 6.0.2
答案 0 :(得分：0)
尝试在此处更新android SDK作为解释Object refrence not set to an instance of an object When I create new Android App (Visual Studio)
请务必参考最新的Android SDK
答案 1 :(得分：0)
我尝试过更新的sdk。由于某些技术问题，无法从android studio更新sdk。所以我直接从
下载了单独的组件http://downloads.puresoftware.org/files/android/
尝试此链接下载Xamarin所需的一切