AlarmManager在错误的时间响应

时间:2013-07-18 12:47:44

标签: java android alarmmanager android-notifications

很抱歉,如果以前回答,但我到处寻找,但没有得到正确的解决方案

我正在使用AlarmManager在每天早上9点自动发出通知,但是当我尝试在模拟器上运行它时会立即执行,并且每半小时(准确地说是31-32分钟)而不是每天早上9点执行一次

任何想法为什么?帮助赞赏。

代码如下:

public class Home extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bsheet);

    notificationAlert(savedInstanceState);

}

    private void notificationAlert(Bundle savedInstanceState) {

    AlarmManager manager;
    PendingIntent pendingIntent;
    Intent intent=new Intent(Home.this, Notify.class);
    manager=(AlarmManager)getSystemService(ALARM_SERVICE);
    pendingIntent=PendingIntent.getService(Home.this,
            0, intent, 0);
    GregorianCalendar gcal = new GregorianCalendar();
    gcal.set(Calendar.HOUR_OF_DAY, 9);
    gcal.set(Calendar.MINUTE, 0);
    gcal.set(Calendar.SECOND, 0);
    gcal.set(Calendar.MILLISECOND, 0);

    long initTime = gcal.getTimeInMillis();

    manager.setRepeating(AlarmManager.RTC_WAKEUP, initTime,
            24*60*60*1000, pendingIntent);
}

}

欢呼声,

编辑:我的意图是,一旦安装了应用程序,它会在上午9点触发此警报。我已经将警报放在onCreate中,所以我不确定每次启动应用程序时是否只创建警报,当我隐藏应用程序时会发生一些奇怪的事情...再一次见识会很感激!

2 个答案:

答案 0 :(得分:0)

试试这个:

    Calendar currentTime = Calendar.getInstance();
    Calendar alarmTime = Calendar.getInstance();
    currentTime.set(Calendar.HOUR_OF_DAY, 9;
    currentTime.set(Calendar.MINUTE, 0);
    currentTime.set(Calendar.SECOND, 0);
    currentTime.set(Calendar.MILLISECOND, 0);
    if (alarmTime.compareTo(currentTime) <= 0) {
// check for time
alarmTime.add(Calendar.DATE, 1);
}

Intent intent = new Intent(getBaseContext(), Receiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
    getBaseContext(), 1, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
am.setRepeating(AlarmManager.RTC_WAKEUP, alarmTime.getTimeInMillis(),
                        AlarmManager.INTERVAL_DAY, pendingIntent);

答案 1 :(得分:0)

manager.setRepeating(AlarmManager.RTC_WAKEUP, initTime, 24*60*60*1000, pendingIntent);

如果initTime < System.currentTimeMillis()

,闹钟管理员将无人发动

from docs

  

如果过去发生时间,将立即触发警报,警报计数取决于过去触发时间相对于重复间隔的距离。

根据您提供的代码,gcal.getTimeInMillis()将返回与今天9.00 对应的毫秒代码。因此,如果您在此之后尝试运行代码, initTime 将小于当前系统时间,从而触发AlarmManager的即时运行。

要解决此问题,例如,您可以在传递gcal.getTimeInMillis()之前向日历添加一天(如果已经过去),那么它将指向明天9.00 以让它运行明天早上

<强> UPDATE1

尝试这样的代码并按预期工作 - 每10秒启动一次服务:

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    initManager();
}
private void initManager() {
    AlarmManager manager;
    PendingIntent pendingIntent;
    Intent intent = new Intent(this, NotifyService.class);
    manager=(AlarmManager)getSystemService(ALARM_SERVICE);
    pendingIntent=PendingIntent.getService(this, 0, intent, 0);

    long initTime = System.currentTimeMillis() + 5000;

    manager.setRepeating(AlarmManager.RTC_WAKEUP, initTime,
            10*1000, pendingIntent);        
}

但是您可以使用其他选项:AlarmManager.set()方法 你可以像这样点燃它

long runTime = /* your calendar time + 24 hours in millis*/
manager.set(AlarmManager.RTC_WAKEUP, runTime, pendingIntent);       

因此它会在runTime启动您的服务。然后在服务中调用相同的方法重新计算runTime一天,所以看起来像这样:

public MainActivity extends Activity{

    protected onCreate(Bundle bundle){
        ....
        initManager();
    }

    private initManager(){
        ...
        long runTime = /* time of your first alarm/notification/whatever you develope */

        Intent intent = new Intent(this, NotifyService.class);
        pendingIntent=PendingIntent.getService(this, 0, intent, 0);
        manager.set(AlarmManager.RTC_WAKEUP, runTime, pendingIntent);
    }
}

服务:

public NotifyService extends Service{
    ...
    public int onStartCommand(...){
         ...
        /* do stuff */

        Intent intent = new Intent(getApplicationContext(), NotifyService.class);
        pendingIntent=PendingIntent.getService(this, 0, intent, 0);
        long runTime = /* recalculate it according to the next time of firing this service*/
        manager.set(AlarmManager.RTC_WAKEUP, runTime, pendingIntent);

    }

}

因此,每次服务触发时,您的服务都会在AlarmManager中注册一个意图。