View is only defined in XML, in code nothing has been done yet.
2020-02-11 10:13:47.879 3517-3517/com.my.app E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.my.app, PID: 3517
java.lang.NullPointerException: Attempt to invoke virtual method 'long java.util.Date.getTime()' on a null object reference
at java.util.Calendar.setTime(Calendar.java:1749)
at com.github.florent37.singledateandtimepicker.SingleDateAndTimePicker.getDate(SingleDateAndTimePicker.java:436)
at com.github.florent37.singledateandtimepicker.SingleDateAndTimePicker.updateDaysOfMonth(SingleDateAndTimePicker.java:507)
at com.github.florent37.singledateandtimepicker.SingleDateAndTimePicker.setDefaultDate(SingleDateAndTimePicker.java:474)
at com.github.florent37.singledateandtimepicker.SingleDateAndTimePicker.onAttachedToWindow(SingleDateAndTimePicker.java:222)
at android.view.View.dispatchAttachedToWindow(View.java:19553)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3430)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3437)
at android.view.ViewGroup.addViewInner(ViewGroup.java:5149)
at android.view.ViewGroup.addView(ViewGroup.java:4935)
at android.view.ViewGroup.addView(ViewGroup.java:4875)
at android.view.ViewGroup.addView(ViewGroup.java:4848)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:887)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
com.github.florent37:singledateandtimepicker:2.1.5
View is only defined in XML, in code nothing has been done yet.