Previously, Xamarin has been working for me on Windows 10 Version 1511, but then I updated to Windows 10 1607 and Visual Studio kept warning me that there is an update, saying "Xamarin for Visual Studio Update Available." I kept clicking on that, but nothing happened, so finally, I went to Tools -> "Extensions and Updates" and searched for Xamarin, where I downloaded and ran XamarinInstaller.exe. The problem is that my internet cut out part way through so the installation didn't complete, so now when I try to run a Xamarin.Android project, I get this error:
...
1>Skipping target "_CompileJava" because all output files are up-to-date with respect to the input files.
1>Skipping target "_CreateAdditionalResourceCache" because it has no outputs.
1>C:\Program Files (x86)\Java\jdk1.7.0_55\\bin\java.exe -jar "C:\Program Files (x86)\Android\android-sdk\build-tools\24.0.1\\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\v4.4\mono.android.jar"
1>java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
1> at java.lang.ClassLoader.defineClass1(Native Method)
1> at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
1> at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
1> at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
1> at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
1> at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
1> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
1> at java.security.AccessController.doPrivileged(Native Method)
1> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
1> at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
1> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
1> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
1> at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
1>Exception in thread "main"
1>java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0
1>Done building project "MyProject.Droid.csproj" -- FAILED.
1>Build FAILED.
1>
========== Deploy: 0 succeeded, 1 failed, 0 skipped ==========
I updated my java from (see Android NDK: Your APP_BUILD_SCRIPT points to an unknown file):
C:\Program Files (x86)\Java\jdk1.7.0_55
To,
C:\Program Files\Java\jdk1.7.0_79
Which fixed the following error,
Severity Code Description Project File Line Suppression State
Error java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0 TuberEduMobile.Droid C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets 2159
But that did not resolve the first issue above. Also, I downloaded android-ndk-r12b, but when I attempt to build using ndk-build, I get this error:
Android NDK: Your APP_BUILD_SCRIPT points to an unknown file: C:\projects\android-ndk-r12b/jni/Android.mk
C:/projects/android-ndk-r12b/build//../build/core/add-application.mk:198: *** Android NDK: Aborting... . Stop.
Does anyone have any suggestions? How can I get my Xamarin.Android working again? TIA.
UPDATE:
Thank you for the suggestion, @Alan Clark. Tried uninstalling using the link you indicated and reinstalling Xamarin using XamarinInstaller.exe, and even deleted the old Java jdk1.7.0_55 from my machine, where even if I go to Options -> Xamarin -> Android Settings it says for Java Development Kit Location:
C:\Program Files\Java\Jdk1.7.0_79
but for some reason it is still pointing at that directory old directory, because I am getting this error when I attempt to build my Xamarin.Android solution:
1>C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(2159,3): error MSB6004: The specified task executable location "C:\Program Files (x86)\Java\jdk1.7.0_55\\bin\java.exe" is invalid.
Please note that it is pointing to this NDK:
C:\Program Files\Android\ndk\android-ndk\r11c
Not sure if it is related to my specific problem.
Does anyone have any suggestions? TIA.
