public class MainActivity extends FragmentActivity implements TabListener{

private GregorianCalendar mCalendar;
private NotificationManager mNotification;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //알림창 획득
    mNotification = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

    //알람 매니저를 취득
    mManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    ....
        ..
}

    public NotificationManager getNotification(){
        return mNotification;
    }
    public AlarmManager getAlarmManager(){
        return mManager;
    }

//Access to SQLDataBase and get Date, and set it in bookDate..
bookDate.set(Integer.parseInt(year.split("년")[0]),
        Integer.parseInt(month.split("월")[0]),
        Integer.parseInt(day.split("일")[0]),
        Integer.parseInt(hourOfDay.split("시")[0]),
        Integer.parseInt(minute.split("분")[0]));


    //get mainActivity, in order to get AlarmManager..
final MainActivity mainActivity = (MainActivity)getActivity();

AlertDialog.Builder alert_confirm = new AlertDialog.Builder(getActivity());

alert_confirm.setMessage("예약 하시겠습니까?").setCancelable(false).setPositiveButton("예",
new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        doSomething();

        msgViewService.write(vo);
        Log.i("MsgBookingfragment", "msgViewInputVO write done = " + vo.toString());

        FragmentManager FM = getFragmentManager();
        FM.popBackStack();
        FragmentTransaction ft = FM.beginTransaction();


        mainActivity.setHashMapInsert(vo.getPersonID());
        mainActivity.setBookedHashInsert(vo.getPersonID());

        ft.replace(R.id.findperson, new FindPersonFragment()).commit();

        //here, I get AlarmSet Instance and setAlarm..!!
        AlarmSet alarm = new AlarmSet(bookDate,
                getActivity().getApplicationContext(),
                ((MainActivity)getActivity()).getAlarmManager(),
                ((MainActivity)getActivity()).getNotification() );
        alarm.setAlarm();


        Toast.makeText(getActivity().getApplicationContext(), "예약되었습니다.", Toast.LENGTH_LONG).show();
    }

public class AlarmSet extends Activity  implements OnDateChangedListener, OnTimeChangedListener{

 private String tag = "AlarmSet";
    private Calendar bookDate = Calendar.getInstance();
    private Context context;
    private AlarmManager mManager;
    private NotificationManager mNotification;


    public AlarmSet(Calendar cal, Context c,  AlarmManager am, NotificationManager noti){

        bookDate = cal;
        context = c;
        mNotification = noti;
        mManager = am;
    }

    public void setAlarm() {
        mManager.set(AlarmManager.RTC_WAKEUP, bookDate.getTimeInMillis(), pendingIntent());
        Log.i("setAlarm : ", bookDate.getTime().toString());

     //Log shows this message : Sat Oct 18 14:25:52 GMT+09:00 2014
    }

    //set free Alarm
    public void resetAlarm() {
        mManager.cancel(pendingIntent());
    }

    public PendingIntent pendingIntent() {
        Intent i = new Intent(context, AlarmReceiver.class);
        PendingIntent pi = PendingIntent.getActivity(context, 3 , i, PendingIntent.FLAG_CANCEL_CURRENT);
        Log.i(tag, "PendingIntent.......");
        return pi;
    }

public class AlarmReceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    Log.i("TAg", "ggggggggggggggggggggg");
    Toast.makeText(context, R.string.app_name, Toast.LENGTH_SHORT).show();

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.dduo.hrelation"
    android:versionCode="1"
    android:versionName="1.0" >

        <uses-permission android:name="android.permission.WRITE_CONTACTS" />
        <uses-permission android:name="android.permission.READ_CONTACTS" />

        <uses-permission android:name="android.permission.SEND_SMS" />



    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <receiver android:name="org.dduo.hrelation.AlarmReceiver">

            <intent-filter>

                <action android:name="action"/>

            </intent-filter>

        </receiver>

        <activity
            android:name=".MainActivity"
            android:windowSoftInputMode="adjustResize"
            android:label="@string/app_name" >



            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>


        </activity>

    </application>



</manifest>