Question

当用户更改“设置”屏幕上的复选框时，我尝试取消闹钟。

我正在做的是：在我的AlarmReceiver班级发送一个带有意图额外布尔变量的广播，以强制警报取消，如：

   Intent alarmIntent = new Intent("PACKAGE_ALARM");
    alarmIntent.putExtra("cancel", true);
    getActivity().sendBroadcast(alarmIntent);

并在onReceive()方法内：

    if (intent.hasExtra("cancel")) {
        cancelAlarm(context);
    }

其中cancelAlarm是：

private void cancelAlarm(Context context) {
    Intent intent = new Intent(context, ReminderService.class);
    PendingIntent pendingIntent = PendingIntent
            .getService(context, REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT);

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

    alarmManager.cancel(pendingIntent);
}

我已经设置的闹钟是：

    Intent intent = new Intent(context, AlarmrService.class);
    PendingIntent pIntent = PendingIntent
            .getService(context, REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        manager.setExact(AlarmManager.RTC, startTime.getTimeInMillis(), pIntent);

我认为我所做的是正确的，所以我不知道为什么当我调用cancel方法并从我的命令行使用adb shell dumpsys alarm时，我仍然可以阅读：

+2ms running, 0 wakeups, 1 alarms: u0a74:PACKAGEr
  *alarm*:PACKAGE/.reminders.AlarmService
u0a74:PACKAGE +2ms running, 0 wakeups:
+2ms 0 wakes 1 alarms: *alarm*:PACKAGE/.reminders.AlarmService

编辑：完整代码

public class AlarmReceiver extends BroadcastReceiver {
private static final String TAG = AlarmReceiver.class.getSimpleName();

public static final int REQUEST_CODE = 999;

@Override
public void onReceive(Context context, Intent intent) {
    Log.i(TAG, "onReceive MESA STHN onRECEIVE");

    if (intent.hasExtra("cancel")) {
        Log.i(TAG, "onReceive CANCEL");
        cancelAlarm(context);
    }
    if (intent.hasExtra("schedule")) {
        Log.i(TAG, "onReceive SCHEDULE");
        scheduleAlarm(context);
    }

    //Schedule alarm on BOOT_COMPLETED
    if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
        scheduleAlarm(context);
    }
}

/* Schedule the alarm based on user preferences */
public static void scheduleAlarm(Context context) {
    AlarmManager manager = AlarmManagerProvider.getAlarmManager(context);

    String keyReminder = context.getString(R.string.pref_key_reminder);
    String keyAlarm = context.getString(R.string.pref_key_alarm);
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);

    boolean enabled = preferences.getBoolean(keyReminder, false);

    //Intent to trigger
    Intent intent = new Intent(context, ReminderService.class);
    PendingIntent operation = PendingIntent
            .getService(context, REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    Log.i("ALARM", "AlarmReceiver 111111");

    if (enabled) {
        Log.i("ALARM", "AlarmReceiver 2222222");
        //Gather the time preference
        Calendar startTime = Calendar.getInstance();
        try {
            String alarmPref = preferences.getString(keyAlarm, "12:00");
            SimpleDateFormat format = new SimpleDateFormat("HH:mm", Locale.getDefault());
            startTime.setTime(format.parse(alarmPref));
        } catch (ParseException e) {
            Log.w(TAG, "Unable to determine alarm start time", e);
            return;
        }

        //Start at the preferred time
        //If that time has passed today, set for tomorrow
        if (Calendar.getInstance().after(startTime)) {
            startTime.add(Calendar.DATE, 1);
        }

        manager.setExact(AlarmManager.RTC, startTime.getTimeInMillis(), operation);
    } else {
        Log.i(TAG, "scheduleAlarm MESA STO CANCEL");
        manager.cancel(operation);
    }
}

private void cancelAlarm(Context context) {
    Intent intent = new Intent(context, ReminderService.class);
    PendingIntent pendingIntent = PendingIntent
            .getService(context, REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT);

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

    // either value we have to cancel the previous alarm
    alarmManager.cancel(pendingIntent);
}

}

编辑2：来自SettingsFragment的代码，我在那里收听用户首选项的更改：

    listener = new SharedPreferences.OnSharedPreferenceChangeListener() {
        @Override
        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {

            String keyReminder = getActivity().getString(R.string.pref_key_reminder);
            String keyAlarm = getActivity().getString(R.string.pref_key_alarm);
            boolean enabled = sharedPreferences.getBoolean(keyReminder, false);
            String alarmTime = sharedPreferences.getString(keyAlarm, "");

            Intent alarmIntent = new Intent("PACKAGE_ALARM");

            if (key.equals(getResources().getString(R.string.pref_key_reminder))) {


                if (enabled) {
                    // schedule
                    Log.i("SETTINGS", "SCHEDULE ");
                    alarmIntent.putExtra("schedule", true);
                    getActivity().sendBroadcast(alarmIntent);
                } else  {
                    // cancel
                    Log.i("SETTINGS", "CANCEL");
                    alarmIntent.putExtra("cancel", true);
                    getActivity().sendBroadcast(alarmIntent);
                }


            } else if (key.equals(getResources().getString(R.string.pref_key_alarm))) {

                if (enabled) {
                    // update
                } else {
                    // nothing
                }

            }

        }

    };

和接收者在Manifest中的条目：

    <receiver
        android:name=".reminders.AlarmReceiver"
        android:enabled="true"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="PACKAGE_ALARM" />
        </intent-filter>
    </receiver>

取消AlarmManager无效

0 个答案: