Build android project failed

I want to build my android project, but it failed, the error output is below:

-compile:
[javac] Compiling 9 source files to /Users/att/Work/Temp/candyhero/android/bin/classes
[javac] warning: [options] source value 1.5 is obsolete and will be removed in a future release
[javac] warning: [options] target value 1.5 is obsolete and will be removed in a future release
[javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
[javac] /Users/att/Work/Temp/candyhero/android/src/org/libsdl/app/SDLActivity.java:137: error: lambda expressions are not supported in -source 1.5
[javac] File[] files = new File(libraryPath).listFiles((dir, filename) -> {
[javac] ^
[javac] (use -source 8 or higher to enable lambda expressions)
[javac] /Users/att/Work/Temp/candyhero/android/src/org/libsdl/app/SDLActivity.java:146: error: diamond operator is not supported in -source 1.5
[javac] ArrayList libraryNames = new ArrayList<>(files.length);
[javac] ^
[javac] (use -source 7 or higher to enable diamond operator)
[javac] 2 errors
[javac] 3 warnings

add

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

to your build.gradle file

Thank you for your reply, but I have not create a project managed by gradle, just make tool.

If you use ant tool then put the equivalent options for ant in the local ant properties file. If you use other tool to invoke javac then pass the -source 1.8 explicitly.

We should probably mention this in the migration notes.

ant -Djava.source=“1.8” -Djava.target=“1.8” debug

which in my case yields

-compile:
[javac] Compiling 9 source files to /Users/max/Developer/Stage/Workspace/Urho/38_SceneAndUILoad/build/android/Debug/bin/classes
[javac] An exception has occurred in the compiler (1.8.0_77). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.
[javac] com.sun.tools.javac.code.Symbol$CompletionFailure: class file for java.lang.invoke.MethodType not found

reports are there about gradle not compiling with 1.8, but I’m not using it…

Any guess?

I don’t have the old android build tool anymore, so I cannot verify any of these. However, I am pretty sure the way you passed the parameters would not reach the intended ant task. It is not hard to a search to see how other people doing it though.

Command line worked for me. The solution you pointed to surely works for java, I don’t know where to put that build.properties file… in the app build directory?

Allowed list of properties is in: /tools/ant/build.xml (build tools before up to 25.0.2), as pointed in build.xml in android app build directory

Error I posted is due to my setup being broken. Mixed different urho releases…

I encounter this error as well,using command ant debug. How do you fix this error?

As I posted my setup was broken. I mixed urho 1.6 and 1.7 in the same app. That error is related to gradle, and when I did I noticed a gradle-created file in the dir while there shouldn’t be. I delete everything and recreated.
Probably you did the same by intermixing ant build and something gradle-build. Apparently, the two don’t go well together…