Android 使用通知和警报

我在android应用程序中使用通知和警报，但我不明白为什么即使我设置了警报，每次启动应用程序时都会看到通知。 这是主要的活动：

public void setRepeatingAlarm() {
         Intent intent = new Intent(this, MyAlarmService.class);


         PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
         intent, PendingIntent.FLAG_CANCEL_CURRENT);

         long startAt;
         long period;

         SharedPreferences mPref = context.getSharedPreferences("pref_name", Context.MODE_PRIVATE);

         long dif = System.currentTimeMillis() - mPref.getLong("UPDATE_TIME", 0);

         if (dif >= UPDATE_PERIOD) {
           startAt = 0;
           period = UPDATE_PERIOD;
         } else {
           startAt = dif;
           period = dif;
         }


         am.setRepeating(AlarmManager.RTC_WAKEUP, startAt, period,pendingIntent);
}

这是MyAlarmService：

public class MyAlarmService extends BroadcastReceiver {

 NotificationManager nm;

 @Override
 public void onReceive(Context context, Intent intent) {


  nm = (NotificationManager) context
    .getSystemService(Context.NOTIFICATION_SERVICE);
  CharSequence from = "Locali Torino";
  CharSequence message = "Visita le serate!";
  Intent action = new Intent(context, MainActivity.class);

    PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
    action, 0);



  Notification notif = new Notification(R.drawable.disco,
    "Visita le serate!", System.currentTimeMillis());
  notif.setLatestEventInfo(context, from, message, contentIntent);
  notif.flags |= Notification.FLAG_AUTO_CANCEL;
  nm.notify(0, notif);  
  SharedPreferences mPref = context.getSharedPreferences("pref_name", Context.MODE_PRIVATE);
    SharedPreferences.Editor mEditor = mPref.edit();



    long time = System.currentTimeMillis();
    mEditor.putLong("UPDATE_TIME", time);
    mEditor.commit();
 }
}

我希望每天在同一时间看到通知，而不是每次打开应用时都看到。多谢各位

编辑

这是OnCreate：

 @Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   StrictMode.enableDefaults(); //STRICT MODE ENABLED

   context=MainActivity.this;


   am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
   setRepeatingAlarm();





   locale = (TextView) findViewById(R.id.locale7);
   lunedi = (TextView) findViewById(R.id.lunedi7);
   martedi = (TextView) findViewById(R.id.martedi7);
   mercoledi = (TextView) findViewById(R.id.mercoledi7);
   giovedi = (TextView) findViewById(R.id.giovedi7);
   venerdi = (TextView) findViewById(R.id.venerdi7);
   sabato = (TextView) findViewById(R.id.sabato7);
   domenica = (TextView) findViewById(R.id.domenica7);

   Typeface font = Typeface.createFromAsset(getAssets(), "Chunkfive.otf");
   locale.setTypeface(font);
   lunedi.setTypeface(font);
   martedi.setTypeface(font);
   mercoledi.setTypeface(font);
   giovedi.setTypeface(font);
   venerdi.setTypeface(font);
   sabato.setTypeface(font);
   domenica.setTypeface(font);

    getData();



}

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每次活动被称为更新的第一件事是，更新周期为零，所以启动时间总是为零

第二，每次启动应用程序时，都要从活动的oncreate调用setRepeatingAlarm（）。所以你的闹钟每次都停了

第三-将当前时间添加到setrepeating（），否则在设置报警时将调用该报警

所以，做其他的改变（根据你的要求）和这个

 am.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+startAt, period,pendingIntent);

更新：

---

将更新周期存储在SharedReference中，并在oncreate中执行任何操作之前检索它

post ur oncreate of Activity在哪里定义了更新周期，其默认值是什么

private static final long UPDATE\u PERIOD=0所以每次活动被称为更新时，周期将为零，然后？我不知道如何确保每次打开应用程序时都不会看到通知？请将您的完整项目发送给我