2020-04-18 17:03:19.431 23567-23567/com.example.ssss E/AndroidRuntime: FATAL EXCEPTION: main

  Process: com.example.ssss, PID: 23567

  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.ssss/com.example.ssss.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.ssss.adapters.RecyclerViewBaseAdapter.setOnItemClickListener(com.example.ssss.adapters.RecyclerViewBaseAdapter$OnItemClickListener)' on a null object reference

    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3333)

    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3477)

    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)

    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:2043)

    at android.os.Handler.dispatchMessage(Handler.java:106)

    at android.os.Looper.loop(Looper.java:216)

    at android.app.ActivityThread.main(ActivityThread.java:7464)

    at java.lang.reflect.Method.invoke(Native Method)

    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)

    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:955)

   Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.ssss.adapters.RecyclerViewBaseAdapter.setOnItemClickListener(com.example.ssss.adapters.RecyclerViewBaseAdapter$OnItemClickListener)' on a null object reference

    at com.example.ssss.MainActivity.initListener(MainActivity.java:45)

    at com.example.ssss.MainActivity.onCreate(MainActivity.java:40)

    at android.app.Activity.performCreate(Activity.java:7990)

    at android.app.Activity.performCreate(Activity.java:7979)

    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)

    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3308)