AlarmReceiver.java

package com.kenny.openimgur.services;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.text.format.DateUtils;

import com.kenny.openimgur.activities.SettingsActivity;
import com.kenny.openimgur.classes.OpengurApp;
import com.kenny.openimgur.util.LogUtil;
import com.kenny.openimgur.util.NetworkUtils;
import com.kenny.openimgur.util.RequestCodes;

import java.util.Calendar;

/**
 * Created by kcampagna on 8/12/15.
 */
public class AlarmReceiver extends BroadcastReceiver {
    private static final String TAG = AlarmReceiver.class.getSimpleName();

    /**
     * Creates the alarm for fetching notifications
     *
     * @param context
     */
    public static void createNotificationAlarm(Context context) {
        SharedPreferences pref = OpengurApp.getInstance(context).getPreferences();
        boolean enabled = pref.getBoolean(SettingsActivity.KEY_NOTIFICATIONS, true);

        if (enabled) {
            AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
            Intent intent = new Intent(context, AlarmReceiver.class);
            PendingIntent pIntent = PendingIntent.getBroadcast(context, RequestCodes.NOTIFICATION_ALARM, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            am.set(AlarmManager.RTC_WAKEUP, getNextAlarmTime(pref), pIntent);
        } else {
            LogUtil.v(TAG, "Notifications not enabled, not scheduling alarm");
        }
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        OpengurApp app = OpengurApp.getInstance(context);

        if (app.getUser() != null && !NetworkUtils.hasDataSaver(context)) {
            LogUtil.v(TAG, "User present, fetching notifications");
            context.startService(NotificationService.createIntent(context));
        } else {
            LogUtil.v(TAG, "No user present, not fetching notifications");
        }
    }

    /**
     * Returns the next time for the notifications alarm
     *
     * @param pref
     * @return
     */
    private static long getNextAlarmTime(SharedPreferences pref) {
        String val = pref.getString(SettingsActivity.KEY_NOTIFICATION_FREQUENCY, SettingsActivity.NOTIFICATION_TIME_30);
        long updateTime = DateUtils.MINUTE_IN_MILLIS;

        switch (val) {
            case SettingsActivity.NOTIFICATION_TIME_15:
                updateTime *= 15;
                break;

            case SettingsActivity.NOTIFICATION_TIME_60:
                updateTime *= 60;
                break;

            case SettingsActivity.NOTIFICATION_TIME_120:
                updateTime *= 120;
                break;

            case SettingsActivity.NOTIFICATION_TIME_30:
            default:
                updateTime *= 30;
                break;
        }

        long nextUpdate = System.currentTimeMillis() + updateTime;

        if (LogUtil.SHOULD_WRITE_LOGS) {
            Calendar cal = Calendar.getInstance();
            cal.setTimeInMillis(nextUpdate);
            LogUtil.v(TAG, "Next alarm set for " + cal.getTime().toString());
        }

        return nextUpdate;
    }
}