java - 如何通过服务发送通知

Question

我正在尝试通过服务发送通知。通知时间是从我有日期、时间等列的数据库表中设置的。因此，当 System.currentTimeMillis 等于来自数据库列的时间时，我试图将通知发送给用户。但是我的实现不起作用，有人可以帮助我吗？提前致谢

这是我的服务文件

public class MyService extends Service {

    private NotificationManager notificationManager;
    private DBHelper dbHelper;
    private SQLiteDatabase db;

    @Override
    public void onCreate() {
        Log.i("myLOgs", "Service: onCreate()");
        super.onCreate();
        dbHelper = new DBHelper(this);
        db = dbHelper.getReadableDatabase();
        notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        Log.i("myLOgs", "Service: onStartCommand()");

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        Date date = new Date();
        String currentDateString = dateFormat.format(date);

        SimpleDateFormat timeFormat = new SimpleDateFormat("HH-mm");
        Date time = new Date();
        String currentTimeString = timeFormat.format(time);

        String[] columns = {DBHelper.DATE, DBHelper.TIME, DBHelper.EVENT};
        Cursor cursor = db.query(DBHelper.TABLE_NAME, columns, null, null, null, null, null);
        cursor.moveToFirst();
        do {
            String dateString = cursor.getString(cursor.getColumnIndex(DBHelper.DATE));
            String timeString  = cursor.getString(cursor.getColumnIndex(DBHelper.TIME));
            String eventString = cursor.getString(cursor.getColumnIndex(DBHelper.EVENT));
            if((currentDateString.equals(dateString)) && (currentTimeString.equals(timeString))) {
                Notification notification = new Notification(R.drawable.ic_launcher, eventString, System.currentTimeMillis());
            }
            if(cursor.moveToLast()) {
                cursor.moveToFirst();
            }
        }while(true);

        //return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }
}

Answer 1

您可以简单地使用此方法从服务发出通知。

只需将此方法作为您的服务类的成员，然后您就可以从服务类 onStartCommand 或任何您需要的地方调用此方法。

我在我的项目中使用的完全正常工作......

  private int notificationID = 100;

  private void giveNotification(String notificationTitle, String bodytext)
  {
    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    @SuppressWarnings("deprecation")
    Notification notification = new Notification(R.drawable.ic_launcher, "New Message", System.currentTimeMillis());

    Intent notificationIntent = new Intent(this, DeliveryReport.class);

    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, notificationID, notificationIntent, 0);

    notification.setLatestEventInfo(getApplicationContext(), notificationTitle, bodytext, pendingIntent);
    notification.flags |= Notification.FLAG_AUTO_CANCEL;
    notificationManager.notify(notificationID++, notification);
  }