java source code of AlarmSetter

// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.stephenmcgruer.threethingstoday;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

import java.util.Calendar;

public class AlarmSetter extends BroadcastReceiver {

    public static void setDailyAlarm(Context context) {
        Intent notifyIntent = new Intent(context, AlarmReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(
                context, 0, notifyIntent, PendingIntent.FLAG_CANCEL_CURRENT);

        // TODO(smcgruer): Allow user to configure the time.
        final Calendar cal = Calendar.getInstance();
        if (cal.get(Calendar.HOUR_OF_DAY) >= 20)
            cal.add(Calendar.DATE, 1);
        cal.set(Calendar.HOUR_OF_DAY, 20);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),
                AlarmManager.INTERVAL_DAY, pendingIntent);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        setDailyAlarm(context);
    }
}