android - 如何取消一个 AlarmManager

Question

我已经设置了一个 alarmManager 如下:

    Intent intent = new Intent(TopActivity.this, RecordActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    intent.putExtra(Utils.KEY_RECORD_TIME, recordLength);
    intent.putExtra(Utils.KEY_REC_START_TIME, start);

    saveTimeAndLength(start, recordLength);

    PendingIntent pintent = PendingIntent.getActivity(TopActivity.this, 0, intent, 0);
    AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarm.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pintent);

下面应该取消它，但它总是失败。我错过了什么？

 AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(TopActivity.this, RecordActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
intent.putExtra(Utils.KEY_RECORD_TIME, start);
intent.putExtra(Utils.KEY_REC_START_TIME, recordLength);

PendingIntent pintent = PendingIntent.getActivity(TopActivity.this, 0, intent, 0);
try {
    alarmManager.cancel(pintent);
    Log.e(TAG, "Cancelling all pending intents");
} catch (Exception e) {
    Log.e(TAG, "AlarmManager update was not canceled. " + e.toString());
}

我已经在 StackOverflow 上阅读了很多答案，但仍然无法弄清楚问题是什么。
提前致谢!

Answer 1

要取消事件，AlarmManager 需要比较两个 Intent。

这是通过 filterEquals (Intent other) 方法实现的

Determine if two intents are the same for the purposes of intent resolution (filtering). That is, if their action, data, type, class, and categories are the same. This does not compare any extra data included in the intents.

我不确定为什么类相同时它不匹配。

我也有同样的问题，为了克服这个问题，我也设置了一个数据。

看看这对你有没有帮助。

已编辑

设置闹钟

    Intent intent = new Intent(TopActivity.this, RecordActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    intent.putExtra(Utils.KEY_RECORD_TIME, recordLength);
    intent.putExtra(Utils.KEY_REC_START_TIME, start);
    intent.setData(Uri.fromParts("yourappscheme", "alarm", null)); 
    saveTimeAndLength(start, recordLength);

    PendingIntent pintent = PendingIntent.getActivity(TopActivity.this, 0, intent, 0);
    AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarm.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pintent);

以及什么时候需要取消

AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(TopActivity.this, RecordActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
intent.putExtra(Utils.KEY_RECORD_TIME, start);
intent.putExtra(Utils.KEY_REC_START_TIME, recordLength);
intent.setData(Uri.fromParts("yourappscheme", "alarm", null)); 

PendingIntent pintent = PendingIntent.getActivity(TopActivity.this, 0, intent, 0);
try {
    alarmManager.cancel(pintent);
    Log.e(TAG, "Cancelling all pending intents");
} catch (Exception e) {
    Log.e(TAG, "AlarmManager update was not canceled. " + e.toString());
}