Alarm Manager Example

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?

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.

This code will help you to make a repeating alarm. The repeating time can set by you.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center" >

<EditText
android:id="@+id/ethr"
android:layout_width="50dp"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Hr"
android:singleLine="true" >


<requestFocus />
</EditText>

<EditText
android:id="@+id/etmin"
android:layout_width="55dp"
android:layout_height="wrap_content"

android:ems="10"
android:hint="Min"
android:singleLine="true" />

<EditText
android:id="@+id/etsec"
android:layout_width="50dp"
android:layout_height="wrap_content"

android:ems="10"
android:hint="Sec"
android:singleLine="true" />

</LinearLayout>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingTop="10dp">


<Button
android:id="@+id/setAlarm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="onClickSetAlarm"
android:text="Set Alarm" />

</LinearLayout>

</LinearLayout>

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 );

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:

<receiver android:name=".Alarm" android:exported="true">
<intent-filter>
<action android:name="mypackage.START_ALARM" >
</action>
</intent-filter>
</receiver>

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.

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", "-----> 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<BackgroundTaskListener> 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<>();

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;

}

}

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

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.alarmexample" >

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


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

<activity
android:name="com.example.alarmexample.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

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

<receiver android:name="MyBroadcastReceiver" >
</receiver>
</application>

</manifest>

• `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 [tag: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 -> {
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**

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.aminography.alarm">

<application
... >

<service
android:name="path.to.MyIntentService"
android:enabled="true"
android:stopWithTask="false" />

</application>

</manifest>

**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)

Alarm Manager:

Add To XML Layout (*init these view on create in main activity)

<TimePicker
android:id="@+id/timepicker"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"></TimePicker>

<Button
android:id="@+id/btn_start"
android:text="start Alarm"
android:onClick="start_alarm_event"
android:layout_width="match_parent"
android:layout_height="52dp" />


Add To Manifest (Inside application tag && outside activity)

<receiver android:name=".AlarmBroadcastManager"
android:enabled="true"
android:exported="true"/>

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();


}

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("")
}
}

**This is working code. It wakes CPU every 10 minutes until the phone turns off.**

Add to Manifest.xml:

...
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
...
<receiver android:process=":remote" android:name=".Alarm"></receiver>
...

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:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
...
<receiver android:name=".AutoStart">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"></action>
</intent-filter>
</receiver>
...
<service
android:name=".YourService"
android:enabled="true"
android:process=":your_service" >
</service>


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);
}
}
}