Android Open Source - android-002 Alarms

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License

The source code is released under:
Apache License
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Java Source Code

package com.michaelfitzmaurice.dailyselfie;
/*from  ww w. jav  a 2 s.co m*/
import static com.michaelfitzmaurice.dailyselfie.SelfieListActivity.LOG_TAG;

import java.util.Date;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.SystemClock;
import android.util.Log;

/**
 * Singleton to manage a single alarm
 * 
 * @author Michael Fitzmaurice, November 2014
 */
public class Alarms {
  
  public static final String ALARM_INTERVAL_PREFERENCES_KEY = 
    "alarmTimeInterval";
  public static final String NEXT_ALARM_DUE_PREFERENCES_KEY = 
    "nextAlarmDue";
  
  public static final AlarmTimeInterval DEFAULT_ALARM_INTERVAL = 
    new AlarmTimeInterval(1, 0, 0);
  
  private static AlarmManager alarmManager;
  private static SharedPreferences sharedPrefences;
  private static PendingIntent pendingIntent;
  private static Alarms instance;

  private Alarms() {}
  
  public static Alarms getInstance() {
    
    if (pendingIntent == null) {
      throw new IllegalStateException("Context has not yet been set");
    } else {
      synchronized (Alarms.class) {
        if (instance == null) {
          instance = new Alarms();
        }
            }
      return instance;
    }
  }
      
  public static void setContext(Context context, 
                  SharedPreferences prefences) {   
    
    alarmManager = 
      (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
    Intent receiverIntent = new Intent(context, AlarmReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(context, 
                          0, 
                          receiverIntent, 
                          0);
    sharedPrefences = prefences;
  }
  
  public void setInitialAlarmIfRequired() {
    
    if (sharedPrefences.getString(ALARM_INTERVAL_PREFERENCES_KEY, null) != null) {
      Log.d(LOG_TAG, "Alarm is already set - nothing to do");
    } else {
      Log.i(LOG_TAG, 
        "Alarm has never been set - setting initial default alarm");
      sharedPrefences
        .edit()
        .putString(ALARM_INTERVAL_PREFERENCES_KEY, 
              DEFAULT_ALARM_INTERVAL.serialiseToString() )
        .apply();
      set(DEFAULT_ALARM_INTERVAL);
    }
  }
  
  public void set(AlarmTimeInterval interval) {
    
    if ( interval.isZero() ) {
      Log.w(LOG_TAG, 
        "User attempted to set alarm interval to 0 ms - ignoring...");
    } else {
      long delayMs = interval.toMilliseconds();
      long intervalMs  = interval.toMilliseconds();
      
      Log.d(LOG_TAG, "Setting new notification alarm to start in " 
          + delayMs + " ms and run every " 
          + intervalMs + " ms");
      Log.d(LOG_TAG, "Pending intent for alarm manager is: " 
                      + pendingIntent);
      alarmManager.setInexactRepeating(
            AlarmManager.ELAPSED_REALTIME_WAKEUP,
            SystemClock.elapsedRealtime() + delayMs,
            intervalMs,
            pendingIntent);
      setNextAlarmDuePref(interval);
    }
  }
  
  public void cancel() {
    
    Log.d(LOG_TAG, "Cancelling all alarms for PendingIntent: " 
              + pendingIntent);
    alarmManager.cancel(pendingIntent);
  }
  
  private void setNextAlarmDuePref(AlarmTimeInterval interval) {
    
    long nextAlarmDueMs = 
      System.currentTimeMillis() + interval.toMilliseconds();
    Date nextAlarmDueDate = new Date(nextAlarmDueMs);
    Log.d(LOG_TAG, "Persisting next alarm due time in prefs as " 
        + nextAlarmDueDate);
    sharedPrefences
      .edit()
      .putLong(NEXT_ALARM_DUE_PREFERENCES_KEY, 
            nextAlarmDueMs)
      .apply();
  }
}
Java Source Code List
