安卓：獲取與AlarmManager

Question

設置所有PendingIntents我設置的報警是這樣的：

alarmManager.set(AlarmManager.RTC_WAKEUP, alarmTime, pendingEvent); 

我感興趣的是去除其中先前設置的所有報警，清除它們。

有沒有辦法讓我做到這一點，或獲得當前設置的所有警報，以便我可以手動刪除它們？

Answer 1

您需要創建掛起的意圖，然後將其取消

AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); 

    Intent updateServiceIntent = new Intent(context, MyPendingIntentService.class); 
    PendingIntent pendingUpdateIntent = PendingIntent.getService(context, 0, updateServiceIntent, 0); 

    // Cancel alarms 
    try { 
     alarmManager.cancel(pendingUpdateIntent); 
    } catch (Exception e) { 
     Log.e(TAG, "AlarmManager update was not canceled. " + e.toString()); 
    } 

Answer 2

您不必繼續引用。只需定義一個新的PendingIntent，就像您在創建它時所定義的一樣。

例如：

如果我創建了一個的PendingIntent要由AlarmManager發射了是這樣的：在某處你的其他代碼（甚至其他活動）

Intent alarmIntent = new Intent(getApplicationContext(), AlarmBroadcastReceiver.class); 
    alarmIntent.setData(Uri.parse("custom://" + alarm.ID)); 
    alarmIntent.setAction(String.valueOf(alarm.ID)); 
    AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); 

    PendingIntent displayIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, alarmIntent, 0); 

    alarmManager.set(AlarmManager.RTC_WAKEUP, alarmDateTime, displayIntent); 

然後你就可以做到這一點取消：

Intent alarmIntent = new Intent(getApplicationContext(), AlarmBroadcastReceiver.class); 
alarmIntent.setData(Uri.parse("custom://" + alarm.ID)); 
alarmIntent.setAction(String.valueOf(alarm.ID)); 
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); 

PendingIntent displayIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, alarmIntent, 0); 

alarmManager.cancel(displayIntent); 

這裏最重要的是設置的PendingIntent具有完全相同的數據和行爲，和其他標準，以及這裏所說http://developer.android.com/reference/android/app/AlarmManager.html#cancel%28android.app.PendingIntent%29

Answer 3

要取消警報，您不需要重新創建相同的PendingIntent並傳遞相同的請求代碼。

因此，我創建了一個AlarmUtits來幫助我將所有請求代碼保存在首選項中，以便在將來需要時取消它。您只需要使用以下類別並調用以下方法：

• addAlarm添加新警報並傳遞請求代碼。
• cancelAlarm要除去報警，需要重新創建相同的
  意圖並傳遞相同的請求代碼。
• hasAlarm若要驗證是否添加了該警報，則需要重新創建 相同的Intent並傳遞相同的請求代碼。
• cancelAllAlarms刪除設置的所有報警。

我AlarmUtils

public class AlarmUtils { 

private static final String sTagAlarms = ":alarms"; 

public static void addAlarm(Context context, Intent intent, int notificationId, Calendar calendar) { 

    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); 
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, notificationId, intent, PendingIntent.FLAG_CANCEL_CURRENT); 

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
     alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent); 
    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { 
     alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent); 
    } else { 
     alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent); 
    } 

    saveAlarmId(context, notificationId); 
} 

public static void cancelAlarm(Context context, Intent intent, int notificationId) { 
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); 
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, notificationId, intent, PendingIntent.FLAG_CANCEL_CURRENT); 
    alarmManager.cancel(pendingIntent); 
    pendingIntent.cancel(); 

    removeAlarmId(context, notificationId); 
} 

public static void cancelAllAlarms(Context context, Intent intent) { 
    for (int idAlarm : getAlarmIds(context)) { 
     cancelAlarm(context, intent, idAlarm); 
    } 
} 

public static boolean hasAlarm(Context context, Intent intent, int notificationId) { 
    return PendingIntent.getBroadcast(context, notificationId, intent, PendingIntent.FLAG_NO_CREATE) != null; 
} 

private static void saveAlarmId(Context context, int id) { 
    List<Integer> idsAlarms = getAlarmIds(context); 

    if (idsAlarms.contains(id)) { 
     return; 
    } 

    idsAlarms.add(id); 

    saveIdsInPreferences(context, idsAlarms); 
} 

private static void removeAlarmId(Context context, int id) { 
    List<Integer> idsAlarms = getAlarmIds(context); 

    for (int i = 0; i < idsAlarms.size(); i++) { 
     if (idsAlarms.get(i) == id) 
      idsAlarms.remove(i); 
    } 

    saveIdsInPreferences(context, idsAlarms); 
} 

private static List<Integer> getAlarmIds(Context context) { 
    List<Integer> ids = new ArrayList<>(); 
    try { 
     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); 
     JSONArray jsonArray2 = new JSONArray(prefs.getString(context.getPackageName() + sTagAlarms, "[]")); 

     for (int i = 0; i < jsonArray2.length(); i++) { 
      ids.add(jsonArray2.getInt(i)); 
     } 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 

    return ids; 
} 

private static void saveIdsInPreferences(Context context, List<Integer> lstIds) { 
    JSONArray jsonArray = new JSONArray(); 
    for (Integer idAlarm : lstIds) { 
     jsonArray.put(idAlarm); 
    } 

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); 
    SharedPreferences.Editor editor = prefs.edit(); 
    editor.putString(context.getPackageName() + sTagAlarms, jsonArray.toString()); 

    editor.apply(); 
} 

}