在Fragment中使用Alarm Manager和Broadcast Receiver时，需要确保正确设置上下文、Intent和PendingIntent来确保它们能够正常工作。

以下是一个示例代码，演示如何在Fragment中使用Alarm Manager和Broadcast Receiver：

首先，在Fragment类中定义Alarm Manager和Broadcast Receiver：

public class MyFragment extends Fragment {
    private AlarmManager alarmManager;
    private BroadcastReceiver alarmReceiver;
    ...
}

然后，在Fragment的onCreateView()方法中初始化Alarm Manager和Broadcast Receiver：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    ...
    alarmManager = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
    alarmReceiver = new MyReceiver();
    ...
}

接下来，创建Broadcast Receiver类：

public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 这里执行Alarm Manager触发后的操作
        ...
    }
}

接下来，在Fragment中设置Alarm Manager和Pending Intent，并启动Broadcast Receiver：

Intent intent = new Intent(getActivity(), MyReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 10000, pendingIntent);

以上代码在Fragment中设置了一个10秒的重复Alarm Manager，每次触发时启动MyReceiver类的Broadcast Receiver，然后执行操作。

最后，在Fragment的onDestroyView()方法中取消Alarm Manager：

@Override
public void onDestroyView() {
    super.onDestroyView();
    Intent intent = new Intent(getActivity(), MyReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), 0, intent, PendingIntent.FLAG_NO_CREATE);
    alarmManager.cancel(pendingIntent);
    getActivity().unregisterReceiver(alarmReceiver);
    ...
}

这样，在Fragment中使用Alarm Manager和Broadcast Receiver就能正常工作了。