알람기능을 어플리케이션에 넣으려고 합니다 (초보 개발자입니다)

알람 시간이 CheckBox로 뜨면 그 중에 몇 가지를 선택해서 알람을 설정하려 합니다.

일단은 코드를 아래처럼 짰는데. 알람 실행이 되질 않네요....

해결방법을 알려주세요ㅠㅠ

MainActivity.class

 package com.test.alarm;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;

public class MainActivity extends Activity {
  
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main2);

  //현재 시간 HH:mm으로 불러오기
  SimpleDateFormat formatter = new SimpleDateFormat("HH:mm", Locale.KOREA);
  Date date = new Date();
  String time = formatter.format(date);
  
  TextView text1 = (TextView) findViewById(R.id.textView1);
  text1.setText("현재 시각은 "+time+"입니다.");
  
  //현재 시간에서 1시간 30분 후
  Calendar calendar1 = Calendar.getInstance();
  calendar1.add(Calendar.HOUR, +1);
  calendar1.add(Calendar.MINUTE, +30);
  
  SimpleDateFormat formatter2 = new SimpleDateFormat("HH:mm", Locale.KOREA);
  Date date2 = calendar1.getTime();
  String time2 = formatter2.format(date2);
  
  TextView text2 = (TextView) findViewById(R.id.textView2);
  text2.setText("첫 번째 렘수면 시각은 "+time2+"입니다.");
  
  //3시간 10분 후
  Calendar calendar2 = Calendar.getInstance();
  calendar2.add(Calendar.HOUR, +3);
  calendar2.add(Calendar.MINUTE, +10);
  
  SimpleDateFormat formatter3 = new SimpleDateFormat("HH:mm", Locale.KOREA);
  Date date3 = calendar2.getTime();
  String time3 = formatter3.format(date3);
  
  TextView text3 = (TextView) findViewById(R.id.textView3);
  text3.setText("두 번째 렘수면 시각은 "+time3+"입니다.");
  
  //5시간 후
  Calendar calendar3 = Calendar.getInstance();
  calendar3.add(Calendar.HOUR, +5);
  
  SimpleDateFormat formatter4 = new SimpleDateFormat("HH:mm", Locale.KOREA);
  Date date4 = calendar3.getTime();
  String time4 = formatter4.format(date4);
  
  TextView text4 = (TextView) findViewById(R.id.textView4);
  text4.setText("세 번째 렘수면 시각은 "+time4+"입니다.");
  
  //7시간 후
  Calendar calendar4 = Calendar.getInstance();
  calendar4.add(Calendar.HOUR, +7);
  
  SimpleDateFormat formatter5 = new SimpleDateFormat("HH:mm", Locale.KOREA);
  Date date5 = calendar4.getTime();
  String time5 = formatter5.format(date5);
  
  TextView text5 = (TextView) findViewById(R.id.textView5);
  text5.setText("네 번째 렘수면 시각은 "+time5+"입니다.");
  
  //9시간 10분 후
  Calendar calendar5 = Calendar.getInstance();
  calendar5.add(Calendar.HOUR, +3);
  calendar5.add(Calendar.MINUTE, +10);
  
  SimpleDateFormat formatter6 = new SimpleDateFormat("HH:mm", Locale.KOREA);
  Date date6 = calendar5.getTime();
  String time6 = formatter6.format(date6);
  
  TextView text6 = (TextView) findViewById(R.id.textView6);
  text6.setText("다섯 번째 렘수면 시각은 "+time6+"입니다.");
  
  //알람 설정
  Button setAlarm = (Button) findViewById(R.id.button1);
  
  setAlarm.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {
    
    final CheckBox check1 = (CheckBox) findViewById(R.id.checkBox1);
    final CheckBox check2 = (CheckBox) findViewById(R.id.checkBox2);
    final CheckBox check3 = (CheckBox) findViewById(R.id.checkBox3);
    final CheckBox check4 = (CheckBox) findViewById(R.id.checkBox4);
    final CheckBox check5 = (CheckBox) findViewById(R.id.checkBox5);
    
    if (check1.isChecked()) {
     Intent intent1 = new Intent(MainActivity.this, AlarmReceiver.class);
     PendingIntent sender = PendingIntent.getBroadcast(MainActivity.this, 0, intent1, 0);
     
     Calendar calendar = Calendar.getInstance();
     calendar.setTimeInMillis(System.currentTimeMillis());
     calendar.add(Calendar.HOUR, +1);
     calendar.add(Calendar.MINUTE, +30);
     AlarmManager am1 = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
     am1.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
    }
    if (check2.isChecked()) {
     Intent intent2 = new Intent(MainActivity.this, AlarmReceiver.class);
     PendingIntent sender2 = PendingIntent.getBroadcast(MainActivity.this, 1, intent2, 0);
     
     Calendar calendar = Calendar.getInstance();
     calendar.setTimeInMillis(System.currentTimeMillis());
     calendar.add(Calendar.HOUR, +3);
     calendar.add(Calendar.MINUTE, +10);
     AlarmManager am2 = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
     am2.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender2);
    }
    if (check3.isChecked()) {
     Intent intent3 = new Intent(MainActivity.this, AlarmReceiver.class);
     PendingIntent sender3 = PendingIntent.getBroadcast(MainActivity.this, 2, intent3, 0);
     
     Calendar calendar = Calendar.getInstance();
     calendar.setTimeInMillis(System.currentTimeMillis());
     calendar.add(Calendar.HOUR, +5);
     AlarmManager am3 = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
     am3.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender3);
    }
    if (check4.isChecked()) {
     Intent intent4 = new Intent(MainActivity.this, AlarmReceiver.class);
     PendingIntent sender4 = PendingIntent.getBroadcast(MainActivity.this, 3, intent4, 0);
     
     Calendar calendar = Calendar.getInstance();
     calendar.setTimeInMillis(System.currentTimeMillis());
     calendar.add(Calendar.HOUR, +7);
     AlarmManager am4 = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
     am4.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender4);
    }
    if (check5.isChecked()) {
     Intent intent5 = new Intent(MainActivity.this, AlarmReceiver.class);
     PendingIntent sender5 = PendingIntent.getBroadcast(MainActivity.this, 4, intent5, 0);
     
     Calendar calendar = Calendar.getInstance();
     calendar.setTimeInMillis(System.currentTimeMillis());
     calendar.add(Calendar.HOUR, +9);
     calendar.add(Calendar.MINUTE, +10);
     AlarmManager am5 = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
     am5.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender5);
    }
   }
  });
 }
}

AlarmReceiver.class

 package com.test.alarm;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class AlarmReceiver extends BroadcastReceiver {
 
    @Override
    public void onReceive(Context context, Intent intent) {
     Toast.makeText(context, "알람", Toast.LENGTH_SHORT).show();
    }
}

AndroidManifest.xml

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.test.alarm"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen">
        <receiver
            android:name=".AlarmReceiver"
            android:process=":remote"/>
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
         </application>
</manifest>