I am getting NullPointerException in my Activity as soon as I call the dpd.show() method.

[vikash-sh]

@wdullaer

My MainActivity class extends a BaseFragmentActivity (Custom) which extends FragmentActivity and I can't change it as changing it disturbs my App's functionality. MainActivity neither includes a ToolBar nor it's hidden in styles.xml for the Custom MainActivity Theme. Now I implemented the library as implementation 'com.wdullaer:materialdatetimepicker:4.2.3' and used the sample code to show DatePickerDialog as below but I am getting an exception which occurs as soon as I click on imageSearch ImageView. Please help me to resolve this issue. Also, I am implementing it in Tablet UI.

build.gradle (:app)

dependencies {
    implementation 'com.wdullaer:materialdatetimepicker:4.2.3'
}

Code:

imageSearch.setOnClickListener(v -> {
            Calendar now = Calendar.getInstance();
            com.wdullaer.materialdatetimepicker.date.DatePickerDialog dpd = com.wdullaer.materialdatetimepicker.date.DatePickerDialog.newInstance(
                    onDateSetListener,
                    now.get(Calendar.YEAR), // Initial year selection
                    now.get(Calendar.MONTH), // Initial month selection
                    now.get(Calendar.DAY_OF_MONTH) // Inital day selection
            );
            // If you're calling this from an AppCompatActivity
            dpd.show(getSupportFragmentManager(), "Datepickerdialog");
        });

    private com.wdullaer.materialdatetimepicker.date.DatePickerDialog.OnDateSetListener onDateSetListener = (view, year, monthOfYear, dayOfMonth) -> {
        String date = "You picked the following date: " + dayOfMonth + "/" + (++monthOfYear) + "/" + year;
        Log.e("DatePickerDialog", "onDateSet: selectedDate=> " + date);
    };

Crash:

                                       FATAL EXCEPTION: main
                                       Process: com.noteactivethreebeta, PID: 12716
                                       java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
                                       at com.android.internal.app.WindowDecorActionBar.getDecorToolbar(WindowDecorActionBar.java:247)
                                       at com.android.internal.app.WindowDecorActionBar.init(WindowDecorActionBar.java:199)
                                       at com.android.internal.app.WindowDecorActionBar.<init>(WindowDecorActionBar.java:181)
                                       at android.app.Dialog.show(Dialog.java:477)
                                       at androidx.fragment.app.DialogFragment.onStart(DialogFragment.java:993)
                                       at androidx.fragment.app.Fragment.performStart(Fragment.java:3187)
                                       at androidx.fragment.app.FragmentStateManager.start(FragmentStateManager.java:628)
                                       at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:290)
                                       at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1943)
                                       at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1845)
                                       at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1782)
                                       at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:565)
                                       at android.os.Handler.handleCallback(Handler.java:942)
                                       at android.os.Handler.dispatchMessage(Handler.java:99)
                                       at android.os.Looper.loopOnce(Looper.java:226)
                                       at android.os.Looper.loop(Looper.java:313)
                                       at android.app.ActivityThread.main(ActivityThread.java:8810)
                                       at java.lang.reflect.Method.invoke(Native Method)
                                       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:604)
                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1067)