Fix 404 - move notification channel creation to AllInOneActivity. (#413)

import android.app.Fragment;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.app.NotificationChannel;

import android.app.NotificationManager;

import android.content.AsyncQueryHandler;

import android.content.BroadcastReceiver;

import android.content.ContentResolver;

import android.content.ContentUris;

import android.content.Context;

import android.content.Intent;

import android.content.SharedPreferences;

import android.content.SharedPreferences.OnSharedPreferenceChangeListener;

import com.android.calendar.CalendarController.EventType;

import com.android.calendar.CalendarController.ViewType;

import com.android.calendar.agenda.AgendaFragment;

import com.android.calendar.alerts.AlertService;

import com.android.calendar.alerts.NotificationMgr;

import com.android.calendar.month.MonthByWeekFragment;

import com.android.calendar.selectcalendars.SelectVisibleCalendarsFragment;

import com.android.datetimepicker.date.DatePickerDialog;

import static android.provider.CalendarContract.EXTRA_EVENT_ALL_DAY;

import static android.provider.CalendarContract.EXTRA_EVENT_BEGIN_TIME;

import static android.provider.CalendarContract.EXTRA_EVENT_END_TIME;

import static com.android.calendar.alerts.AlertService.ALERT_CHANNEL_ID;

public class AllInOneActivity extends AbstractCalendarActivity implements EventHandler,

        OnSharedPreferenceChangeListener, SearchView.OnQueryTextListener, SearchView.OnSuggestionListener, NavigationView.OnNavigationItemSelectedListener {

        // This needs to be created before setContentView

        mController = CalendarController.getInstance(this);

        // Create notification channel

        NotificationMgr nm = new AlertService.NotificationMgrWrapper(

                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE));

        if (Utils.isOreoOrLater()) {

            String appName = this.getString(R.string.standalone_app_label);

            NotificationChannel channel  = new NotificationChannel(ALERT_CHANNEL_ID, appName, NotificationManager.IMPORTANCE_HIGH);

            nm.createNotificationChannel(channel);

        }

        // Check and ask for most needed permissions

        checkAppPermissions();

        NotificationMgr nm = new NotificationMgrWrapper(

                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE));

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            String appName = context.getString(R.string.standalone_app_label);

            NotificationChannel channel  = new NotificationChannel(ALERT_CHANNEL_ID, appName, NotificationManager.IMPORTANCE_HIGH);

            nm.createNotificationChannel(channel);

        }

        final long currentTime = System.currentTimeMillis();

        SharedPreferences prefs = GeneralPreferences.getSharedPreferences(context);