Question

我在Stackoverflow上阅读了很多问题和答案，其中许多只是强调.cancel()和特殊的唯一ID。但是，现在无论我尝试了多少次，我都无法取消它。

我的唯一身份证

final static int RQS_1 = 1337;

我的setAlarm功能。 pickTime是当前的Activity，timesUp是另一个Service类，它在时间结束时显示toast。

Intent intent = new Intent(pickTime.this, timesUp.class);
PendingIntent timesUpIntent = PendingIntent.getService(pickTime.this, RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(),
                 timesUpIntent);
alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), timesUpIntent);

我的cancelAlarm功能

Intent intent = new Intent(this, pickTime.class);
PendingIntent timesUpIntent = PendingIntent.getBroadcast(this, RQS_1, intent, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        if (timesUpIntent != null) {
            alarmManager.cancel(timesUpIntent);
            timesUpIntent.cancel();
            Toast.makeText(getApplicationContext(), "Alarm is cancelled",
                    Toast.LENGTH_SHORT).show();
                    } else {

            Toast.makeText(getApplicationContext(), "Unable to stop timer",
                    Toast.LENGTH_SHORT).show();
        }

我的时间服务

public class timesUp extends Service {

    @Override
    public void onCreate() {

        // TODO Auto-generated method stub

        Toast.makeText(this, "MyAlarmService.onCreate()", Toast.LENGTH_LONG)
                .show();

    }

    @Override
    public IBinder onBind(Intent intent) {

        // TODO Auto-generated method stub

        Toast.makeText(this, "MyAlarmService.onBind()", Toast.LENGTH_LONG)
                .show();

        return null;

    }

    @Override
    public void onDestroy() {

        // TODO Auto-generated method stub

        super.onDestroy();

        Toast.makeText(this, "MyAlarmService.onDestroy()", Toast.LENGTH_LONG)
                .show();

    }

    @Override
    public void onStart(Intent intent, int startId) {

        // TODO Auto-generated method stub

        super.onStart(intent, startId);

        Toast.makeText(this, "MyAlarmService.onStart()", Toast.LENGTH_LONG)
                .show();

    }

    @Override
    public boolean onUnbind(Intent intent) {

        // TODO Auto-generated method stub

        Toast.makeText(this, "MyAlarmService.onUnbind()", Toast.LENGTH_LONG)
                .show();

        return super.onUnbind(intent);

    }

}

Answer 1

要取消警报，您必须创建在启动时创建的相同PendingIntent。你在开始的时候正在做，

Intent intent = new Intent(pickTime.this, timesUp.class);
PendingIntent timesUpIntent = PendingIntent
                                .getService(pickTime.this, RQS_1, intent, 0);

你正在取消，

Intent intent = new Intent(this, pickTime.class);
PendingIntent timesUpIntent = PendingIntent
                                        .getBroadcast(this, RQS_1, intent, 0);

它们一样吗？

不，他们不一样。您正在为PendingIntent创建Service以开始尝试取消PendingIntent BroadCast个{{1}}。

Answer 2

我怀疑代码中PendingIntent.getService(pickTime.this, RQS_1, intent, 0);方法的最后一个（第四个）参数有问题。

尝试使用PendingIntent.FLAG_CANCEL_CURRENT代替0，它应该可以使用。

Answer 3

不确定这是否是唯一的问题，但

@Override
public void onStart(Intent intent, int startId) {

    // TODO Auto-generated method stub

    super.onStart(intent, startId);

    Toast.makeText(this, "MyAlarmService.onStart()", Toast.LENGTH_LONG)
            .show();

}**strong text**

不推荐使用onStart。对于服务使用onStartCommand（）。

请参阅开发人员文档中的示例：

Android Services

我在我的应用音频控制中使用了类似的东西，效果很好。

Intent intent = new Intent(getApplicationContext(), QuickReceiver.class);
intent.putExtra("extraKeyHere", "some extra if you like");

PendingIntent pi = PendingIntent.getBroadcast(getApplicationContext(),
    1137, intent, PendingIntent.FLAG_CANCEL_CURRENT);

AlarmManager al = 
    (AlarmManager)getApplicationContext().getSystemService(Context.ALARM_SERVICE);

al.setRepeating(AlarmManager.RTC_WAKEUP, endCal.getTimeInMillis(), 
    AlarmManager.INTERVAL_DAY, pi);

这只是创建一个触发广播接收器的意图（QuickReceiver.class）。

public class QuickReceiver extends BroadcastReceiver
{   
@Override
public void onReceive(Context context, Intent intent)
{   
        Bundle extras = intent.getExtras();
        if(extras != null)
        {   
        String endProfile = extras.getString("extraKeyHere");

            Intent i = new Intent(context, QuickReceiver.class);

            PendingIntent pi = PendingIntent.getBroadcast(context,     
            1137, i, PendingIntent.FLAG_CANCEL_CURRENT);

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

            al.cancel(pi);
        }
    }
}

记下我对两个pendingIntents使用了“getBroadcast（）”。你可以从广播开始你的服务（当然使用onStartCommand（:)）并在那里做更多的工作。

警报挂起警报不会取消

3 个答案: