java.lang.NoClassDefFoundError: Failed resolution of: Lcom/vondear/rxtool/RxActivityTool；

 Process: com.uam.module.user, PID: 20662
    java.lang.NoClassDefFoundError: Failed resolution of: Lcom/vondear/rxtool/RxActivityTool;
        at com.vondear.rxui.activity.ActivityBase.onCreate(ActivityBase.java:21)
        at com.vondear.rxfeature.activity.ActivityScanerCode.onCreate(ActivityScanerCode.java:136)
        at android.app.Activity.performCreate(Activity.java:7995)
        at android.app.Activity.performCreate(Activity.java:7979)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.vondear.rxtool.RxActivityTool" on path: DexPathList[[zip file "/data/app/~~Yro6EpPY2JXUWO5je3EydA==/com.uam.module.user-UEszJAzib-dnay4D0BkjMQ==/base.apk"],nativeLibraryDirectories=[/data/app/~~Yro6EpPY2JXUWO5je3EydA==/com.uam.module.user-UEszJAzib-dnay4D0BkjMQ==/lib/x86, /data/app/~~Yro6EpPY2JXUWO5je3EydA==/com.uam.module.user-UEszJAzib-dnay4D0BkjMQ==/base.apk!/lib/x86, /system/lib, /system_ext/lib, /product/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:207)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at com.vondear.rxui.activity.ActivityBase.onCreate(ActivityBase.java:21) 
        at com.vondear.rxfeature.activity.ActivityScanerCode.onCreate(ActivityScanerCode.java:136) 
        at android.app.Activity.performCreate(Activity.java:7995) 
        at android.app.Activity.performCreate(Activity.java:7979) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:223) 
        at android.app.ActivityThread.main(ActivityThread.java:7656) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947) 

这种错误有两种 一种就是混淆没加 第二种就是我遇到的 

因为我的项目是kotlin的 引用了一个第三方 RxTool 扫一扫和二维码的 他引用之后运行就会报这个错误 也是找了好久错误

因为我是debug 混淆没开 就是找为啥找不到他 于是想到是不是引用module问题 

最后解决就是把他引用的module的这个

compileOnly project(':RxKit')

换成这个

api project(':RxKit')

就可以了 也是解决了

希望对你有帮助 苟德柏