androidx crash

[JacCheng]

java.lang.IncompatibleClassChangeError: Class 'com.yuyh.library.imgsel.ui.ISListActivity' does not implement interface 'androidx.lifecycle.LifecycleOwner' in call to 'androidx.lifecycle.Lifecycle androidx.lifecycle.LifecycleOwner.getLifecycle()' (declaration of 'androidx.lifecycle.LiveData' appears in /data/app/com.ld.zy.tpzb-tepn1S4zyESfLOqvCowW9w==/base.apk) at androidx.lifecycle.LiveData.observe(LiveData.java:172) at androidx.loader.app.LoaderManagerImpl$LoaderInfo.setCallback(LoaderManagerImpl.java:100) at androidx.loader.app.LoaderManagerImpl.createAndInstallLoader(LoaderManagerImpl.java:400) at androidx.loader.app.LoaderManagerImpl.initLoader(LoaderManagerImpl.java:421) at com.yuyh.library.imgsel.ui.fragment.ImgSelFragment.onViewCreated(ImgSelFragment.java:172) at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1471) at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784) at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852) at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:802) at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625) at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411) at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366) at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273) at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3273) at androidx.fragment.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3229) at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:201) at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:620) at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:178) at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1419) at android.app.Activity.performStart(Activity.java:7479) at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3454) at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:180) at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:165) at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:142) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199) at android.os.Handler.dispatchMessage(Handler.java:112) at android.os.Looper.loop(Looper.java:216) at android.app.ActivityThread.main(ActivityThread.java:7625) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)