AlarmManager 会在断电时删除所有计划吗？

我已经在特定时间设置了闹钟。如果手机关机了闹钟会丢失吗？我已关闭手机，然后再次启动，但闹钟未在指定时间触发。

PendingIntent pendingIntent = PendingIntent.getBroadcast(
            Global.a.getApplicationContext(), (int) cd.e.alarmTime, intent, 0);

    AlarmManager alarmManager = (AlarmManager) Global.a.getSystemService(Activity.ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC, cd.e.alarmTime, pendingIntent);

首先你需要创建一个BroadcastReceiver在 BOOT_COMPLETE 上触发

public class BootReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(final Context context, final Intent intent) {
            if ("android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) {
                    Intent mServiceIntent = new Intent();
                    mServiceIntent
                                    .setAction("com.crossfire.appname.service.BootService");
                    ComponentName service = context.startService(mServiceIntent);
                    if (null == service) {
                            // something really wrong here
                            Log.e(TAG, "Could not start service ");
                    }
            } else {
                    Log.e(TAG, "Received unexpected intent " + intent.toString());
            }
    }
}

然后创建一个服务来重置所有警报：

public class BootService extends Service {

    private final String TAG = "BootService";

    @Override
    public IBinder onBind(final Intent intent) {
            return null;
    }

    @Override
    public void onCreate() {
            super.onCreate();
            Trace.i(TAG, "created");
    }

    @Override
    public void onStart(final Intent intent, final int startId) {
            super.onStart(intent, startId);
            Trace.i(TAG, "started");

            LoadAlarmsFromDatabase();

    }

    private void LoadAlarmsFromDatabase() {
           Cursor c = mDbHelper.getPendingAlarms();
            if (c.moveToFirst()) {
                    do {

                            int id = c.getInt(mDbHelper.ID_COLUMN);
                            String time = c.getString(mDbHelper.TIME_COLUMN);
                            addNotification(id, time);
                    } while (c.moveToNext());
            }
            c.close();
    }

    private void addNotification(int apptId, String time) {
            Trace.d(TAG, "addNotification " + apptId + ", " + time);
            Intent intent = new Intent(BootService.this,
                            ApptBroadcastReceiver.class);

            intent.putExtra("appt_id", Integer.toString(apptId));

            PendingIntent mAlarmSender = PendingIntent.getBroadcast(
                            BootService.this, apptId, intent, 0);

            long alarmTime = System.currentTimeMillis() + 60000;
            Calendar c = null;

            try {
                    c = CustomDateUtils.StringToCalendar(time);
                    alarmTime = c.getTimeInMillis();
            } catch (ParseException e) {
                    Log.e(TAG, "ParseException");
            }

            AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
            am.set(AlarmManager.RTC_WAKEUP, alarmTime, mAlarmSender);

    }
}

最后，将权限和接收者添加到清单中

 <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 <receiver android:name=".receiver.BootReceiver" android:enabled="true">
            <intent-filter>
                    <action android:name ="android.intent.action.BOOT_COMPLETED"></action>
            </intent-filter>
    </receiver>