问题:

After upgrading gradle of my project (and library attached to it) from 2.1.3 -> 2.2.0 it doesn't build anymore and it says:

Error:Execution failed for task ':app:transformNative_libsWithStripDebugSymbolForDebug'. java.lang.NullPointerException (no error message)

Anyone have a clue on why this is?

回答1:

I found answer here: https://stackoverflow.com/a/40117446/1088975

The point is to set both targetSdkVersion and compileSdkVersion to 22"

回答2:

You need to change the following lines in build.gradle file:

    android {
        // SDK 24 worked for me - make sure you have the latest and update it accordingly.
        compileSdkVersion 24
        buildToolsVersion "24.0.2"
    ...
    }

回答3:

Maybe you can update the ndk version. I update the ndk version from r10 to r13,and finally it worked.

回答4:

You might want to check if the location of your NDK folder has any white space in it...if it has you can move your ndk folder to the c:\ drive and rebuild

Also, check the gradle versiom of your app and either upgrade or download later version, because some ndk versions do not support later gradle version