Alarm Manager Example

Question

I want to implement a schedule function in my project  So I Googled for an Alarm manager program but I can t find any examples    Can anyone help me with a basic alarm manager program

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AlarmManager in combination with IntentService  I think the best pattern for using AlarmManager is its collaboration with an IntentService  The IntentService is triggered by the AlarmManager and it handles the required actions through the receiving intent  This structure has not performance impact like using BroadcastReceiver  I have developed a sample code for this idea in kotlin which is available here   MyAlarmManager kt  import android app AlarmManager import android app PendingIntent import android content Context import android content Intent  object MyAlarmManager        private var pendingIntent  PendingIntent    null      fun setAlarm context  Context  alarmTime  Long  message  String            val alarmManager  AlarmManager   context getSystemService Context ALARM SERVICE  as AlarmManager          val intent   Intent context  MyIntentService  class java          intent action   MyIntentService ACTION SEND TEST MESSAGE         intent putExtra MyIntentService EXTRA MESSAGE  message           pendingIntent   PendingIntent getService context  0  intent  PendingIntent FLAG UPDATE CURRENT          alarmManager set AlarmManager RTC WAKEUP  alarmTime  pendingIntent             fun cancelAlarm context  Context            pendingIntent  let               val alarmManager  AlarmManager   context getSystemService Context ALARM SERVICE  as AlarmManager             alarmManager cancel it                       MyIntentService kt  import android app IntentService import android content Intent  class MyIntentService   IntentService  MyIntentService          override fun onHandleIntent intent  Intent             intent  apply               when  intent action                    ACTION SEND TEST MESSAGE - gt                        val message   getStringExtra EXTRA MESSAGE                      println message                                                       companion object           const val ACTION SEND TEST MESSAGE    ACTION SEND TEST MESSAGE          const val EXTRA MESSAGE    EXTRA MESSAGE             manifest xml   lt  xml version  1 0  encoding  utf-8   gt   lt manifest xmlns android  http   schemas android com apk res android      package  com aminography alarm  gt        lt application              gt        lt service         android name  path to MyIntentService          android enabled  true          android stopWithTask  false    gt        lt  application gt    lt  manifest gt    Usage   val calendar   Calendar getInstance   calendar add Calendar SECOND  10  MyAlarmManager setAlarm applicationContext  calendar timeInMillis   Test Message      If you want to to cancel the scheduled alarm  try this   MyAlarmManager cancelAlarm applicationContext

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I tried the solution from XXX and while it did initially work  at some point it stopped working  The onReceive never got called again  I spent hours trying to figure out what it could be  What I came to realize is that the Intent for whatever mysterious reason was no longer being called  To get around this  I discovered that you really do need to specify an action for the receiver in the manifest  Example    lt receiver android name   Alarm  android exported  true  gt       lt intent-filter gt           lt action android name  mypackage START ALARM   gt           lt  action gt       lt  intent-filter gt   lt  receiver gt     Note that the name is   Alarm  with the period  In XXX s setAlarm method  create the Intent as follows   Intent i   new Intent  mypackage START ALARM      The START ALARM message can be whatever you want it to be  I just gave it that name for demonstration purposes   I have not seen receivers defined in the manifest without an intent filter that specifies the action  Creating them the way XXX has specified it seems kind of bogus  By specifying the action name  Android will be forced to create an instance of the BroadcastReceiver using the class that corresponds to the action  If you rely upon context  be aware that Android has several different objects that are ALL called context and may not result in getting your BroadcastReceiver created  Forcing Android to create an instance of your class using only the action message is far better than relying upon some iffy context that may never work

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Here s a fairly self-contained example  It turns a button red after 5sec       public void SetAlarm                 final Button button   buttons 2      replace with a button from your own UI         BroadcastReceiver receiver   new BroadcastReceiver                  Override public void onReceive  Context context  Intent                                   button setBackgroundColor  Color RED                    context unregisterReceiver  this       this    BroadcastReceiver  not Activity                                   this registerReceiver  receiver  new IntentFilter  com blah blah somemessage               PendingIntent pintent   PendingIntent getBroadcast  this  0  new Intent  com blah blah somemessage    0            AlarmManager manager    AlarmManager  this getSystemService  Context ALARM SERVICE                 set alarm to fire 5 sec  1000 5  from now  SystemClock elapsedRealtime            manager set  AlarmManager ELAPSED REALTIME WAKEUP  SystemClock elapsedRealtime     1000 5  pintent            Remember though that the AlarmManager fires even when your application is not running  If you call this function and hit the Home button  wait 5 sec  then go back into your app  the button will have turned red   I don t know what kind of behavior you would get if your app isn t in memory at all  so be careful with what kind of state you try to preserve

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MainActivity java  package com example alarmexample     import android app Activity    import android app AlarmManager    import android app PendingIntent    import android content Intent    import android os Bundle    import android view View    import android view View OnClickListener    import android widget Button    import android widget EditText    import android widget Toast     public class MainActivity extends Activity     Button b1          Override       protected void onCreate Bundle savedInstanceState              super onCreate savedInstanceState             setContentView R layout activity main             startAlert           public void startAlert              int timeInSec   2           Intent intent   new Intent this  MyBroadcastReceiver class             PendingIntent pendingIntent   PendingIntent getBroadcast                                          this getApplicationContext    234  intent  0             AlarmManager alarmManager    AlarmManager  getSystemService ALARM SERVICE             alarmManager set AlarmManager RTC WAKEUP  System currentTimeMillis      timeInSec   1000   pendingIntent             Toast makeText this   Alarm set to after     i     seconds  Toast LENGTH LONG  show                   MyBroadcastReceiver java  package com example alarmexample     import android content BroadcastReceiver    import android content Context    import android content Intent    import android media MediaPlayer    import android widget Toast     public class MyBroadcastReceiver extends BroadcastReceiver         MediaPlayer mp         Override       public void onReceive Context context  Intent intent              mp MediaPlayer create context  R raw alarm             mp start              Toast makeText context   Alarm   Toast LENGTH LONG  show                    AndroidManifest xml   lt  xml version  1 0  encoding  utf-8   gt     lt manifest xmlns android  http   schemas android com apk res android        package  com example alarmexample   gt          lt uses-permission android name  android permission VIBRATE    gt           lt application           android allowBackup  true            android icon   drawable ic launcher            android label   string app name            android theme   style AppTheme   gt              lt activity               android name  com example alarmexample MainActivity                android label   string app name   gt                 lt intent-filter gt                     lt action android name  android intent action MAIN    gt                      lt category android name  android intent category LAUNCHER    gt                 lt  intent-filter gt             lt  activity gt              lt receiver android name  MyBroadcastReceiver   gt             lt  receiver gt         lt  application gt      lt  manifest gt

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After ten years  you can read this training explanation on the official documentation

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I have made my own implementation to do this on the simplest way as possible   import android app AlarmManager  import android app PendingIntent  import android content BroadcastReceiver  import android content Context  import android content Intent  import android content IntentFilter   import junit framework Assert          Created by Daniel on 28 08 2016      public abstract class AbstractSystemServiceTask        private final Context context      private final AlarmManager alarmManager      private final BroadcastReceiver broadcastReceiver      private final PendingIntent pendingIntent       public AbstractSystemServiceTask final Context context  final String id  final long time  final AlarmType alarmType  final BackgroundTaskListener backgroundTaskListener             Assert assertNotNull  ApplicationContext can t be null   context           Assert assertNotNull  ID can t be null   id            this context   context           this alarmManager    AlarmManager  this context getSystemService Context ALARM SERVICE            this context registerReceiver                  this broadcastReceiver   this getBroadcastReceiver backgroundTaskListener                   new IntentFilter id             this configAlarmManager                  this pendingIntent   PendingIntent getBroadcast this context  0  new Intent id   0                   time                  alarmType              public void stop              this alarmManager cancel this pendingIntent           this context unregisterReceiver this broadcastReceiver              private BroadcastReceiver getBroadcastReceiver final BackgroundTaskListener backgroundTaskListener             Assert assertNotNull  BackgroundTaskListener can t be null    backgroundTaskListener            return new BroadcastReceiver                   Override             public void onReceive Context context  Intent intent                     backgroundTaskListener perform context  intent                                       private void configAlarmManager final PendingIntent pendingIntent  final long time  final AlarmType alarmType             long ensurePositiveTime   Math max time  0L            switch  alarmType                case REPEAT                  this alarmManager setRepeating AlarmManager RTC WAKEUP  System currentTimeMillis    ensurePositiveTime  pendingIntent                   break              case ONE TIME              default                  this alarmManager set AlarmManager RTC WAKEUP  System currentTimeMillis     ensurePositiveTime  pendingIntent                        public interface BackgroundTaskListener            void perform Context context  Intent intent               public enum AlarmType            REPEAT  ONE TIME              The only next step  implement it   import android content Context  import android content Intent  import android util Log   import    AbstractSystemServiceTask   import java util concurrent TimeUnit          Created by Daniel on 28 08 2016      public class UpdateInfoSystemServiceTask extends AbstractSystemServiceTask        private final static String ID    UPDATE INFO SYSTEM SERVICE       private final static long REPEAT TIME   TimeUnit SECONDS toMillis 10       private final static AlarmType ALARM TYPE   AlarmType REPEAT       public UpdateInfoSystemServiceTask Context context             super context  ID  REPEAT TIME  ALARM TYPE  new BackgroundTaskListener                   Override             public void perform Context context  Intent intent                     Log i  MyAppLog    ----- gt  UpdateInfoSystemServiceTask                       DO HERE WHATEVER YOU WANT                                       Log i  MyAppLog    UpdateInfoSystemServiceTask started                I like to work with this implementation  but another possible good way  it s don t make the AbstractSystemServiceTask class abstract  and build it through a Builder   I hope it help you   UPDATED Improved to allow several BackgroundTaskListener on the same BroadCastReceiver   import android app AlarmManager  import android app PendingIntent  import android content BroadcastReceiver  import android content Context  import android content Intent  import android content IntentFilter   import junit framework Assert   import java util HashSet  import java util Set          Created by Daniel on 28 08 2016      public abstract class AbstractSystemServiceTask        private final Context context      private final AlarmManager alarmManager      private final BroadcastReceiver broadcastReceiver      private final PendingIntent pendingIntent       private final Set lt BackgroundTaskListener gt  backgroundTaskListenerSet       public AbstractSystemServiceTask final Context context  final String id  final long time  final AlarmType alarmType             Assert assertNotNull  ApplicationContext can t be null   context           Assert assertNotNull  ID can t be null   id            this backgroundTaskListenerSet   new HashSet lt  gt              this context   context           this alarmManager    AlarmManager  this context getSystemService Context ALARM SERVICE            this context registerReceiver                  this broadcastReceiver   this getBroadcastReceiver                    new IntentFilter id             this configAlarmManager                  this pendingIntent   PendingIntent getBroadcast this context  0  new Intent id   0                   time                  alarmType              public synchronized void registerTask final BackgroundTaskListener backgroundTaskListener             Assert assertNotNull  BackgroundTaskListener can t be null   backgroundTaskListener            this backgroundTaskListenerSet add backgroundTaskListener              public synchronized void removeTask final BackgroundTaskListener backgroundTaskListener             Assert assertNotNull  BackgroundTaskListener can t be null   backgroundTaskListener            this backgroundTaskListenerSet remove backgroundTaskListener              public void stop              this backgroundTaskListenerSet clear             this alarmManager cancel this pendingIntent           this context unregisterReceiver this broadcastReceiver              private BroadcastReceiver getBroadcastReceiver              return new BroadcastReceiver                   Override             public void onReceive final Context context  final Intent intent                     for  BackgroundTaskListener backgroundTaskListener   AbstractSystemServiceTask this backgroundTaskListenerSet                         backgroundTaskListener perform context  intent                                                         private void configAlarmManager final PendingIntent pendingIntent  final long time  final AlarmType alarmType             long ensurePositiveTime   Math max time  0L            switch  alarmType                case REPEAT                  this alarmManager setRepeating AlarmManager RTC WAKEUP  System currentTimeMillis    ensurePositiveTime  pendingIntent                   break              case ONE TIME              default                  this alarmManager set AlarmManager RTC WAKEUP  System currentTimeMillis     ensurePositiveTime  pendingIntent                        public interface BackgroundTaskListener            void perform Context context  Intent intent               public enum AlarmType            REPEAT  ONE TIME

User · Answer

Here s an example with Alarm Manager using Kotlin   class MainActivity   AppCompatActivity          val editText  EditText by bindView R id edit text      val timePicker  TimePicker by bindView R id time picker      val buttonSet  Button by bindView R id button set      val buttonCancel  Button by bindView R id button cancel      val relativeLayout  RelativeLayout by bindView R id activity main      var notificationId   0      override fun onCreate savedInstanceState  Bundle             super onCreate savedInstanceState          setContentView R layout activity main           timePicker setIs24HourView true           val alarmManager   getSystemService Context ALARM SERVICE  as AlarmManager          buttonSet setOnClickListener               if  editText text isBlank                      Toast makeText applicationContext   Title is Required     Toast LENGTH SHORT  show                   return setOnClickListener                           alarmManager set                  AlarmManager RTC WAKEUP                  Calendar getInstance   apply                       set Calendar HOUR OF DAY  timePicker hour                      set Calendar MINUTE  timePicker minute                      set Calendar SECOND  0                    timeInMillis                  PendingIntent getBroadcast                      applicationContext                      0                      Intent applicationContext  AlarmBroadcastReceiver  class java  apply                           putExtra  notificationId     notificationId                          putExtra  reminder   editText text                                             PendingIntent FLAG CANCEL CURRENT                                             Toast makeText applicationContext   SET     editText text    Toast LENGTH SHORT  show               reset                      buttonCancel setOnClickListener               alarmManager cancel                  PendingIntent getBroadcast                      applicationContext  0  Intent applicationContext  AlarmBroadcastReceiver  class java   0               Toast makeText applicationContext   CANCEL     Toast LENGTH SHORT  show                        override fun onTouchEvent event  MotionEvent    Boolean            getSystemService Context INPUT METHOD SERVICE  as InputMethodManager               hideSoftInputFromWindow relativeLayout windowToken  InputMethodManager HIDE NOT ALWAYS          relativeLayout requestFocus           return super onTouchEvent event             override fun onResume             super onResume           reset              private fun reset             timePicker apply               val now   Calendar getInstance               hour   now get Calendar HOUR OF DAY              minute   now get Calendar MINUTE                    editText setText

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This is working code  It wakes CPU every 10 minutes until the phone turns off   Add to Manifest xml        lt uses-permission android name  android permission WAKE LOCK  gt  lt  uses-permission gt       lt receiver android process   remote  android name   Alarm  gt  lt  receiver gt        Code in your class   package yourPackage  import android app AlarmManager  import android app PendingIntent  import android content BroadcastReceiver  import android content Context  import android content Intent  import android os PowerManager  import android widget Toast   public class Alarm extends BroadcastReceiver             Override     public void onReceive Context context  Intent intent                    PowerManager pm    PowerManager  context getSystemService Context POWER SERVICE           PowerManager WakeLock wl   pm newWakeLock PowerManager PARTIAL WAKE LOCK               wl acquire                Put here YOUR code          Toast makeText context   Alarm              Toast LENGTH LONG  show       For example          wl release               public void setAlarm Context context                AlarmManager am    AlarmManager context getSystemService Context ALARM SERVICE           Intent i   new Intent context  Alarm class           PendingIntent pi   PendingIntent getBroadcast context  0  i  0           am setRepeating AlarmManager RTC WAKEUP  System currentTimeMillis    1000   60   10  pi      Millisec   Second   Minute            public void cancelAlarm Context context                Intent intent   new Intent context  Alarm class           PendingIntent sender   PendingIntent getBroadcast context  0  intent  0           AlarmManager alarmManager    AlarmManager  context getSystemService Context ALARM SERVICE           alarmManager cancel sender             Set Alarm from Service   package yourPackage   import android app Service  import android content Context  import android content Intent  import android os IBinder   public class YourService extends Service       Alarm alarm   new Alarm        public void onCreate                 super onCreate                       Override     public int onStartCommand Intent intent  int flags  int startId                 alarm setAlarm this           return START STICKY             Override            public void onStart Intent intent  int startId                alarm setAlarm this               Override     public IBinder onBind Intent intent                 return null            If you want to set alarm repeating at phone boot time   Add permission and the service to Manifest xml     lt uses-permission android name  android permission RECEIVE BOOT COMPLETED  gt  lt  uses-permission gt       lt receiver android name   AutoStart  gt       lt intent-filter gt           lt action android name  android intent action BOOT COMPLETED  gt  lt  action gt       lt  intent-filter gt   lt  receiver gt       lt service         android name   YourService          android enabled  true          android process   your service   gt   lt  service gt    And create a new class   package yourPackage   import android content BroadcastReceiver  import android content Context  import android content Intent   public class AutoStart extends BroadcastReceiver          Alarm alarm   new Alarm         Override     public void onReceive Context context  Intent intent                   if  intent getAction   equals Intent ACTION BOOT COMPLETED                         alarm setAlarm context

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This code will help you to make a repeating alarm  The repeating time can set by you   activity main xml   lt  xml version  1 0  encoding  utf-8   gt        lt LinearLayout xmlns android  http   schemas android com apk res android       xmlns tools  http   schemas android com tools       android layout width  match parent       android layout height  match parent       android orientation  vertical        android background   000000       android paddingTop  100dp  gt        lt LinearLayout     android layout width  match parent      android layout height  wrap content      android gravity  center   gt        lt EditText         android id    id ethr      android layout width  50dp      android layout height  wrap content      android ems  10      android hint  Hr      android singleLine  true   gt             lt requestFocus   gt       lt  EditText gt        lt EditText         android id    id etmin      android layout width  55dp      android layout height  wrap content       android ems  10      android hint  Min      android singleLine  true    gt        lt EditText         android id    id etsec      android layout width  50dp      android layout height  wrap content       android ems  10      android hint  Sec      android singleLine  true    gt        lt  LinearLayout gt       lt LinearLayout     android layout width  match parent      android layout height  wrap content       android gravity  center      android paddingTop  10dp  gt         lt Button         android id    id setAlarm          android layout width  wrap content          android layout height  wrap content          android onClick  onClickSetAlarm          android text  Set Alarm    gt    lt  LinearLayout gt    lt  LinearLayout gt    MainActivity java  public class MainActivity extends Activity       int hr   0      int min   0      int sec   0      int result   1       AlarmManager alarmManager      PendingIntent pendingIntent      BroadcastReceiver mReceiver       EditText ethr      EditText etmin      EditText etsec        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           ethr    EditText  findViewById R id ethr           etmin    EditText  findViewById R id etmin           etsec    EditText  findViewById R id etsec           RegisterAlarmBroadcast                 Override     public boolean onCreateOptionsMenu Menu menu            getMenuInflater   inflate R menu main  menu           return true              Override     protected void onDestroy             unregisterReceiver mReceiver           super onDestroy               public void onClickSetAlarm View v            String shr   ethr getText   toString            String smin   etmin getText   toString            String ssec   etsec getText   toString             if shr equals                   hr   0          else               hr   Integer parseInt ethr getText   toString                 hr hr 60 60 1000                     if smin equals                  min   0          else               min   Integer parseInt etmin getText   toString                 min   min 60 1000                     if ssec equals                  sec   0          else                sec   Integer parseInt etsec getText   toString                  sec   sec   1000                    result   hr min sec          alarmManager setRepeating AlarmManager RTC WAKEUP  System currentTimeMillis    result   pendingIntent               private void RegisterAlarmBroadcast             mReceiver   new BroadcastReceiver                    private static final String TAG    Alarm Example Receiver                Override             public void onReceive Context context  Intent intent                    Toast makeText context   Alarm time has been reached   Toast LENGTH LONG  show                                      registerReceiver mReceiver  new IntentFilter  sample             pendingIntent   PendingIntent getBroadcast this  0  new Intent  sample    0           alarmManager    AlarmManager  this getSystemService Context ALARM SERVICE               private void UnregisterAlarmBroadcast             alarmManager cancel pendingIntent            getBaseContext   unregisterReceiver mReceiver             If you need alarm only for a single time then replace   alarmManager setRepeating AlarmManager RTC WAKEUP  System currentTimeMillis    result   pendingIntent     with   alarmManager set  AlarmManager RTC WAKEUP  System currentTimeMillis     result   pendingIntent

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Alarm Manager   Add To XML Layout   init these view on create in main activity      lt TimePicker     android id    id timepicker      android layout width  match parent      android layout height  0dp      android layout weight  2  gt  lt  TimePicker gt      lt Button     android id    id btn start      android text  start Alarm      android onClick  start alarm event      android layout width  match parent      android layout height  52dp    gt    Add To Manifest  Inside application tag  amp  amp  outside activity     lt receiver android name   AlarmBroadcastManager          android enabled  true          android exported  true   gt    Create AlarmBroadcastManager Class inherit it from BroadcastReceiver    public class AlarmBroadcastManager extends BroadcastReceiver       Override     public void onReceive Context context  Intent intent          MediaPlayer mediaPlayer MediaPlayer create context Settings System DEFAULT RINGTONE URI         mediaPlayer start               In Main Activity  Add these Functions      RequiresApi api   Build VERSION CODES M   public  void start alarm event View view       Calendar calendar Calendar getInstance        calendar set      calendar get Calendar YEAR       calendar get Calendar MONTH       calendar get Calendar DAY OF MONTH       timePicker getHour        timePicker getMinute        0            setAlarm calendar getTimeInMillis          public void setAlarm long timeInMillis       AlarmManager alarmManager  AlarmManager  getSystemService Context ALARM SERVICE       Intent intent new Intent this AlarmBroadcastManager class       PendingIntent pendingIntent PendingIntent getBroadcast this 0 intent 0        alarmManager setRepeating AlarmManager RTC WAKEUP timeInMillis AlarmManager INTERVAL DAY pendingIntent       Toast makeText getApplicationContext    Alarm is Set  Toast LENGTH SHORT  show

[java] Alarm Manager Example

• `AlarmManager` in combination with `IntentService`

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