Hardik051099

DraggableTreeView not working in Fragment

1

I am getting this NullPointerException error 2020-05-14 12:42:28.778 12251-12251/com.app.hardik.studypdf E/AndroidRuntime: FATAL EXCEPTION: main Process: com.app.hardik.studypdf, PID: 12251 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.addView(android.view.View)' on a null object reference...

*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** Build fingerprint: 'xiaomi/whyred/whyred:8.1.0/OPM1.171019.011/V10.2.1.0.OEIMIXM:user/release-keys' Revision: '0' ABI: 'arm64' pid: 4103, tid: 4103, name: om.google.tango >>>...