Android- Reschelude鬧鐘

Question

我有一個意圖服務，每天與服務器連接一次，並且工作正常，就像在android教程中的例子。因爲它只是每天輪詢服務器一次，所以我有疑問。 如果服務嘗試連接服務器並且用戶不在線會發生什麼情況？ 我想念那一天，或者有一種方法可以在運行時重新安排鬧鐘，並嘗試在用戶在線時進行連接？

這裏是我的代碼： OBS：我叫setAlarm（上下文）在我的發射活動

public class SampleBootReceiver extends BroadcastReceiver { 

    SampleAlarmReceiver alarm = new SampleAlarmReceiver(); 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) { 
      alarm.setAlarm(context); 
     } 
    } 
} 



public class SampleAlarmReceiver extends WakefulBroadcastReceiver { 
    private AlarmManager alarmMgr; 
    private PendingIntent alarmIntent; 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     Intent service = new Intent(context, SampleSchedulingService.class); 
     startWakefulService(context, service); 
    } 
    public void setAlarm(Context context) { 
     alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE); 
     Intent intent = new Intent(context, SampleAlarmReceiver.class); 
     alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0); 

     Calendar calendar = Calendar.getInstance(); 
     calendar.setTimeInMillis(System.currentTimeMillis()); 


     alarmMgr.setInexactRepeating(AlarmManager.ELAPSED_REALTIME, 
       SystemClock.elapsedRealtime()+60*1000, AlarmManager.INTERVAL_DAY , alarmIntent); 

     ComponentName receiver = new ComponentName(context, SampleBootReceiver.class); 
     PackageManager pm = context.getPackageManager(); 

     pm.setComponentEnabledSetting(receiver, 
       PackageManager.COMPONENT_ENABLED_STATE_ENABLED, 
       PackageManager.DONT_KILL_APP); 

    } 



public class SampleSchedulingService extends IntentService { 
    public boolean serviceGetNews; 

    public SampleSchedulingService() { 
     super("SchedulingService"); 
    } 


    @Override 
    public void onCreate() { 
     super.onCreate(); 

    } 

    public static final int NOTIFICATION_ID = 1; 
    public static NotificationManager mNotificationManager; 

    @Override 
    protected void onHandleIntent(Intent intent) { 
     Utils.serviceGetNews(getBaseContext()); 
     SampleAlarmReceiver.completeWakefulIntent(intent); 

    } 
    public static void sendNotification(String msg, Context context) { 
     mNotificationManager = (NotificationManager) 
       context.getSystemService(Context.NOTIFICATION_SERVICE); 

     PendingIntent contentIntent = PendingIntent.getActivity(context, 0, 
       new Intent(context, NewsActivity.class), 0); 

     NotificationCompat.Builder mBuilder = 
       new NotificationCompat.Builder(context) 
         .setSmallIcon(R.drawable.ic_launcher) 
         .setContentTitle("title") 
         .setStyle(new NotificationCompat.BigTextStyle() 
           .bigText(msg)) 
         .setContentText(msg) 
       .setAutoCancel(true); 

     mBuilder.setContentIntent(contentIntent); 
     mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build()); 
    } 
} 

Answer 1

你有2個問題，答案之一是依賴於你Service實現。第一個是關於Alarm。一旦你設置了鬧鐘和PendingIntent，它將在正確的時間播出，而不管設備的睡眠狀態或用戶交互。您還將其設置爲重複，因此它也將重新計劃在每天大約同一時間重新發送。關於用戶交互和與服務器聯繫的服務的第二個問題完全取決於您的Service實施。如果你需要服務，比下一次報警更快重試，那麼你需要建立這個邏輯。