Question

我尝试在特定时间设置通知，并在每24小时后重复一次。运行代码时，服务不会启动或重复。我可以做错了吗？

这是警报管理器的代码

AlarmManager alarmMgr;
PendingIntent alarmIntent;
alarmMgr = (AlarmManager)this.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, myService.class);
alarmIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

    // Set the alarm to start at 8:30 a.p.
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, 20);
    calendar.set(Calendar.MINUTE, 30);

    // setRepeating() lets you specify a precise custom interval--in this case,
    // after 24 hours minutes.
    alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 1000*60*60*24, alarmIntent);

这是包含通知代码的服务的类

public class myService extends Service {
private NotificationManager nManager;
private static int HELLO_ID;

@Override
public IBinder onBind(Intent arg0) {
    // TODO Auto-generated method stub
    return null;
}
@Override
public void onCreate() 
{
   // TODO Auto-generated method stub  
   super.onCreate();
}

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

   String ns = this.NOTIFICATION_SERVICE;
   NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

   int icon = R.drawable.ic_launcher;        
   CharSequence tickerText = "Hello"; // ticker-text
   long when = System.currentTimeMillis();         
   Context context = getApplicationContext();     
   CharSequence contentTitle = "Hello";  
   CharSequence contentText = "Hello";      
   Intent notificationIntent = new Intent(this, MainActivity.class);
   PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
   Notification notification = new Notification(icon, tickerText, when);
   notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);

   // and this
   HELLO_ID = 1;
   mNotificationManager.notify(HELLO_ID, notification);
}

@Override
public void onDestroy() 
{
    // TODO Auto-generated method stub
    super.onDestroy();
}

}

通知无法启动且无法重复。请帮帮我

Answer 1

Alarm Manager文档说：

此类提供对系统警报服务的访问。这些允许你安排你的应用程序在运行中的某个时刻运行未来。当闹钟响起时，已注册的意图因为它是由系统广播的

意图需要注册警报。当警报响起时，系统将广播意图，并且将执行广播接收器的onReceive（）方法内的代码。如果你想执行一些长时间的任务，那么使用服务来做到这一点。以下是在应用程序中设置警报功能的快速步骤：

步骤1：创建广播接收器

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
         //start service. It is better to use service to perform long time    task
    }
}

步骤2：设置闹钟

 Intent alarmIntent = new Intent(MyActivity.this, AlarmReceiver.class);
 PendingIntent pendingIntent =          PendingIntent.getBroadcast(MyActivity.this, 0, alarmIntent, 0);
 AlarmManager  alarmMgr = (AlarmManager)this.getSystemService(Context.ALARM_SERVICE);
 alarmMgr .setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);

我创建了一个警报管理器来启动通知没有语法错误，但通知没有出现

1 个答案: