android - java.lang.NoClassDefFoundError at Runtime in Activity's inner class -


i have found lot of similar questions, no 1 helps me.

i have next problem. have complete project android , have export it's functionality .aar library. first of created new project , created new module put source project. @ step things goes , mylib.aar file in /build/outputs/aar/ folder. created new project test mylib.aar, created libs folder under app folder in android studio, , in build.gradle file of test project added these lines:

repositories {     flatdir {dirs 'libs'} }  dependencies {     compile(name: 'mylib', ext: 'aar') }

in manifest file added declaration of mainactivity library:

<activity android:name="com.testlib.mylib.mainactivity"             android:label="mainactivity"/>

android studio found file , can watch source code through built-in decompiler. when try start activity activity isn't placed in lib error:

3838-3838/com.testapp.testsdkapp e/androidruntime﹕ fatal exception: main     process: com.testapp.testsdkapp, pid: 3838     java.lang.noclassdeffounderror: com.testlib.mylib.mainactivity$registerinbackgroundtask             @ com.testlib.mylib.mainactivity.registerinbackground(mainactivity.java:1551)             @ com.testlib.mylib.mainactivity.oncreate(mainactivity.java:269)             @ android.app.activity.performcreate(activity.java:5937)             @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1105)             @ android.app.activitythread.performlaunchactivity(activitythread.java:2251)             @ android.app.activitythread.handlelaunchactivity(activitythread.java:2360)             @ android.app.activitythread.access$800(activitythread.java:144)             @ android.app.activitythread$h.handlemessage(activitythread.java:1278)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5221)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694)

registerinbackgroundtask inner public asynctask class declared in mainactivity in library. tried put mylib.aar in aar folder , declare in build.gradle in other way, didn't me , similar error.

if information not enough, i'll add required parts of code etc. please me, if know how solve problem! thanks.

import mylib.aar module in project , inside dependencies add following line 

  compile project(':mylib')

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