Destroy an instance

flic.sensen

Hey,

Below is my code to start/stop Flic feature on my application.
How do I remove flic buttons from Flic manager?

Here is my code:

findPreference(INTEGRATE_FLIC).setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
             @Override
             public boolean onPreferenceChange(Preference preference, Object newValue) {
                 if (newValue.toString().equals("true")) {
                     PreferenceManager.getDefaultSharedPreferences(getContext()).edit()
                             .putBoolean(INTEGRATE_FLIC, false).apply();
                     FlicManager.setAppCredentials(FLIC_APP_ID, FLIC_APP_SECRET, FLIC_APP_NAME);
                     if (!isAppInstalled(getContext(), FLIC_PACKAGE_NAME)) {
                         flicNotInstalled();
                     } else {
                         FlicManager.getInstance(getContext(), new FlicManagerInitializedCallback() {
                             @Override
                             public void onInitialized(FlicManager manager) {
                                 manager.initiateGrabButton(getActivity());
                             }
                         });
                     }
                     } else {

                     //TODO: Invalidate button here!
                     //FlicManager.destroyInstance();
                     PreferenceManager.getDefaultSharedPreferences(getContext()).edit()
                             .putBoolean(INTEGRATE_FLIC, false).apply();
                 }
                 return true;
             }
         });

If I use FlicManager.destroyInstance(),
I'am getting the following exception:

--------- beginning of crash
2019-08-20 16:14:10.718 3751-3751/com.sensennetworks.senanpr E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.sensennetworks.senanpr, PID: 3751
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.content.Context.unbindService(android.content.ServiceConnection)' on a null object reference
        at io.flic.lib.FlicManager.destroyInstanceInternal(FlicManager.java:402)
        at io.flic.lib.FlicManager.destroyInstance(FlicManager.java:388)
        at com.sensennetworks.senanpr.ui.AdvanceSettingsActivity$OtherFiltersPreferenceFragment$2.onPreferenceChange(AdvanceSettingsActivity.java:1103)
        at android.preference.Preference.callChangeListener(Preference.java:1080)
        at android.preference.TwoStatePreference.onClick(TwoStatePreference.java:65)
        at android.preference.Preference.performClick(Preference.java:1135)
        at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:249)
        at android.widget.AdapterView.performItemClick(AdapterView.java:318)
        at android.widget.AbsListView.performItemClick(AbsListView.java:1192)
        at android.widget.AbsListView$PerformClick.run(AbsListView.java:3184)
        at android.widget.AbsListView$3.run(AbsListView.java:4166)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:201)
        at android.app.ActivityThread.main(ActivityThread.java:6806)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
2019-08-20 16:14:10.728 3751-3751/com.sensennetworks.senanpr E/MQSEventManagerDelegate: failed to get MQSService.

How do I workaround this?