Question

我有用于在状态栏中显示通知的代码。我知道可以通过再次调用setLatestEventInfo()来完成更新，但我希望每半小时更新一次。
我如何跟踪时间？有人知道任何功能吗？
我甚至想过使用计数器，每隔半小时就会增加一次，但是再次检索时间是个问题。

String ns = Context.NOTIFICATION_SERVICE;

NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

int icon = R.drawable.index1;
CharSequence tickerText = "Hello";

long when = System.currentTimeMillis();
Notification notification = new Notification(icon, tickerText, when);
Context context = getApplicationContext();
CharSequence notificationTitle = "My notification";
CharSequence notificationText = "Hello World!";

Intent notificationIntent = new Intent(this, NotificationAppActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
notification.setLatestEventInfo(context, notificationTitle, notificationText, contentIntent);

final int HELLO_ID = 1;

mNotificationManager.notify(HELLO_ID, notification);
notification.defaults |= Notification.DEFAULT_SOUND;
notification.defaults |= Notification.DEFAULT_VIBRATE;
notification.defaults |= Notification.DEFAULT_LIGHTS;
}

Answer 1

您必须使用AlarmManager并每30分钟安排一次重复活动。然后，您需要处理此事件，并在广播接收器的onReceive()更新您的通知，但通常会将Intent发送到您的服务以完成工作。

示例代码：

Intent intent = new Intent(this, MyAlarmBroadcastReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager am = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
long recurring = (30 * 60000);  // in milliseconds
am.setRepeating(AlarmManager.RTC, Calendar.getInstance().getTimeInMillis(), recurring, sender);

您的MyAlarmBroadcastReceiver是常规BroadcastReceiver，代码位于onReceive()。我更喜欢使用一个广播接收器，所以我还为意图添加了一些额外的数据，所以我的广播接收器知道它应该做什么，但如果你愿意，可以把它分开。

public class MyBroadcastReceiver extends BroadcastReceiver {
   @Override
   public void onReceive( Context context, Intent intent ) {

     // ... do what you need to do here...

   }
}

Answer 2

使用alarmManager，如下例所示：

AlarmManager mgr=(AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent i=new Intent(context, OnAlarmReceiver.class);
PendingIntent pi=PendingIntent.getBroadcast(context, 0, i, 0);

mgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), PERIOD, pi);

每半小时更新一次android中的通知

2 个答案: