I searched on the forum but it works for others. What is wrong in my AlarmManager?
I want to call the CallDataSend class in every minute
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent alarmIntent = new Intent(this, CallDataSend.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0,
alarmIntent, PendingIntent.FLAG_ONE_SHOT);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (2 * 1000), pendingIntent);
Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();
}
}
the CallDataSend class:
public final class CallDataSend extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "Alarm worked.", Toast.LENGTH_LONG).show();
}
}
and xml file:
<receiver
android:name="CallDataSend"
android:enabled="false">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
</intent-filter>
</receiver>
I believe you should make the receiver enabled before it can be instantiated by the system.
<receiver
android:name="CallDataSend"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
</intent-filter>
</receiver>
You also have to name your receiver with ".YourClass" instead of "YourClass" if that class is in the same package declared in your manifest's attributes or with "YourCompletePackage.YourClass" if it is not.
Ex:
in your case,
<receiver
android:name=".CallDataSend"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
</intent-filter>
</receiver>
in another case,
<receiver
android:name="com.example.CallDataSend"
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.MAIN"></action>
</intent-filter>
</receiver>
Related
I am developing android application which need auto restart when restart device for that I am using broadcast receiver with action BOOT_COMPLETED.
Broadcast receiver is receiving message when I am restarting device but in restart method I want to start main activity for that I used Intent but in onReceive method of receiver I am getting null context so I am unable to restart main Activity.
Below is code for that.
MainActivity.java
private Object activity;
private TextView tvImeiNum;
private BroadcastReceiver rebootreceiver;
private IntentFilter filter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvImeiNum = (TextView)findViewById(R.id.tv_imeinum);
filter = new IntentFilter();
filter.addAction(Intent.ACTION_BOOT_COMPLETED);
filter.addAction(Intent.ACTION_REBOOT);
rebootreceiver = new BootUpReceiver(MainActivity.this);
LocalBroadcastManager.getInstance(this).registerReceiver(rebootreceiver,
filter);//registering receiver
generateUniqueCode();
}
BootupReceiver.java
public class BootUpReceiver extends BroadcastReceiver {
MainActivity ma;
public BootUpReceiver(MainActivity maContext){
ma=maContext;
}
public BootUpReceiver(){
}
#RequiresApi(api = Build.VERSION_CODES.M)
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
Log.d("TAG REBOOT", "onReceive: " + intent);
Log.d("Reboot complete", "connection");
GlobalTool.restartApplication(context);
}
}
}
GlobalTool.java
public class GlobalTool {
#RequiresApi(api = Build.VERSION_CODES.M)
public static void restartApplication(Context context) {
Log.d("IN App restart:", "");
Log.d("TAG", "restartApplication: ");
if(context != null)
{
Log.d("TAG NULL", "restartApplication: ");
Intent mainIntent = new Intent(context, MainActivity.class);
AlarmManager alarmMgr = (AlarmManager)
context.getSystemService(ALARM_SERVICE);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addNextIntent(mainIntent);
PendingIntent pendingIntent = stackBuilder.getPendingIntent(0,
PendingIntent.FLAG_UPDATE_CURRENT);
long alarmTime = System.currentTimeMillis() + (1 * 1000);
alarmMgr.setExact(AlarmManager.RTC_WAKEUP, alarmTime, pendingIntent);
Log.d("TAG", "restartApplication: 111");
Log.d("TAG", "restartApplication: 111");
}
else {
Intent mainIntent = new Intent(context, MainActivity.class);
AlarmManager alarmMgr = (AlarmManager)
context.getSystemService(ALARM_SERVICE);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addNextIntent(mainIntent);
PendingIntent pendingIntent = stackBuilder.getPendingIntent(0,
PendingIntent.FLAG_UPDATE_CURRENT);
long alarmTime = System.currentTimeMillis() + (1 * 1000);
alarmMgr.setExact(AlarmManager.RTC_WAKEUP, alarmTime, pendingIntent);
Log.d("TAG", "restartApplication: 111");
Log.d("TAG", "restartApplication: 111");
}
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.kioskappdemo">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission
android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
android:name="KioskApplication"
android:allowBackup="true"
android:dataExtractionRules="#xml/data_extraction_rules"
android:fullBackupContent="#xml/backup_rules"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.KioskAppDemo"
tools:targetApi="31"
tools:ignore="Instantiatable">
<service
android:name=".RebootService"
android:enabled="true"
android:exported="true"></service>
<activity
android:name=".MainActivity"
android:exported="true"
android:screenOrientation="landscape"
android:theme="#style/Theme.AppCompat.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category
android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".Activity.BootUpReceiver"
android:enabled="true"
android:exported="true">
<intent-filter >
<action
android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.REBOOT" />
<action
android:name="android.intent.action.QUICKBOOT_POWERON" />
<action android:name="com.reboot.test" />
<action
android:name="android.intent.action.TIMEZONE_CHANGED" />
<action
android:name="android.intent.action.DATE_CHANGED" />
</intent-filter>
</receiver>
</application>
</manifest>
Some you code improvements:
Don't put context to Brodcast Receiver constructor. Use the Context from onReceive method
public class BootUpReceiver extends BroadcastReceiver {
public BootUpReceiver(){
//TODO log
}
...
You should not use LocalBroadcastManager::registerReceiver call. If Broadcast receiver is added to AndroidManifest then it will be started by the system.
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<receiver
android:name=".activity.BootUpReceiver"
android:enabled="true"
android:exported="true"
android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
<intent-filter >
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
Don't use CamelCase for package names (use .activity.BootUpReceiver insetad .Activity.BootUpReceiver)
I have implemented a simple app in order to set an alarm (e.g. 7.00pm) every minute. When running this app at emulator, which android version is 8.1, it runs successfully in background even the app is killed. But when running the same app at my android 9 when app is killed it stops running in background.
public class MainActivity extends AppCompatActivity {
private Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.context = this;
ComponentName receiver = new ComponentName(this, AlarmReceiver.class);
PackageManager pm = this.getPackageManager();
pm.setComponentEnabledSetting(receiver, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
Intent alarm = new Intent(this.context, AlarmReceiver.class);
alarm.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_MULTIPLE_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
boolean alarmRunning = (PendingIntent.getBroadcast(this.context, 0, alarm, PendingIntent.FLAG_NO_CREATE) != null);
if(alarmRunning == false) {
PendingIntent pendingIntent = PendingIntent.getBroadcast(this.context, 0, alarm, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, SystemClock.elapsedRealtime(), 60000, pendingIntent);
}
}
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<uses-permission android:name="com.android.alarm.permission.SET_ALARM" />
<uses-permission android:name="com.android.alarm.permission.FLAG_ACTIVITY_NEW_TASK" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".BackgroundService" />
<receiver android:name=".AlarmReceiver"
android:enabled="true"
android:exported="true"
android:label="RestartServiceWhenStopped">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
<action android:name="android.bluetooth.adapter.action.STATE_CHANGED"/>
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
<action android:name="android.intent.action.TIME_SET" />
</intent-filter>
</receiver>
</application>
AlertReceiver.java
public class AlarmReceiver extends BroadcastReceiver {
private static int minutes=0;
#Override
public void onReceive(Context context, Intent intent) {
Log.e("Service",String.valueOf(Calendar.getInstance().getTimeInMillis()));
intent = new Intent(AlarmClock.ACTION_SET_ALARM);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
minutes++;
intent.putExtra(AlarmClock.EXTRA_HOUR, 7);
intent.putExtra(AlarmClock.EXTRA_MINUTES, minutes);
context.startActivity(intent);
/*Intent background = new Intent(context, BackgroundService.class);
context.startService(background);*/
}
Do you have any idea how to fix this? Thank you in advance!
hi i have an alarm manager and user sets the alarms and i save that into a database for when the phone reboot or boot i write this so far but its not working
public class RestartAlarmsReceiver extends BroadcastReceiver {
private static final String TAG = "alarm";
AlarmManager alarmManager;
Intent mintent;
PendingIntent pendingIntent;
AlarmDbHelper dbHelper;
long time;
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")|| intent.getAction().
equals("android.intent.action.REBOOT")) {
dbHelper = new AlarmDbHelper(context);
List<ChildTour> alarms =dbHelper.getAlarms();
for (int i =0;i<2;i++){
alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
mintent = new Intent(context,AlarmReceiver.class);
ChildTour Child = alarms.get(i);
mintent.putExtra("name",Child.getTime());
mintent.putExtra("tourId",Child.getTourId()+"");
pendingIntent = PendingIntent.getBroadcast(context,Child.getTourId(),mintent,0);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, Child.getHour());
calendar.set(Calendar.MINUTE, Child.getMin());
time=(calendar.getTimeInMillis()-(calendar.getTimeInMillis()%60000));
if(System.currentTimeMillis()>time)
{
if (calendar.AM_PM == 0)
time = time + (1000*60*60*12);
else
time = time + (1000*60*60*24);
}
alarmManager.set(AlarmManager.RTC_WAKEUP,time, pendingIntent);
Log.i("alarm","Alarm set With Id : "+Child.getTourId() +"Hour: " +Child.getHour()+"Minute: "+Child.getMin());
}
}
}
and this is my manifests file i try Reboot and Turn off on my phone and that not working
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<receiver android:name=".AlarmReceiver"/>
<receiver android:name=".RestartAlarmsReceiver"
android:enabled="false">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
<action android:name="android.intent.action.REBOOT"/>
<action android:name="android.intent.action.ACTION_POWER_CONNECTED"/>
</intent-filter>
</receiver>
and my alarmReciver class is working
Your Manifest action should look like .
<receiver
android:name=".receivers.BootCompleteReceiver"
android:enabled="true"
android:exported="true">
<intent-filter android:priority="1000">
<category android:name="android.intent.category.DEFAULT"/>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
<action android:name="android.intent.action.QUICKBOOT_POWERON"/>
<action android:name="com.htc.intent.action.QUICKBOOT_POWERON"/>
<action android:name="android.intent.action.REBOOT"/>
</intent-filter>
</receiver>
As i stated above Auto start option can be a issue of not getting reboot broadcast. So test with some other devices too.If the Device has Auto start then Enable it for your application . Settings > permissions > Autostart. This can be access only manually i.e there is no API to change enable/disable it programmatically. You can check these links for more Link1, Link2/
I got mine working but it was not easy, also I think the tablet/phone may or not need to be rooted
Try you manifest like this :
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<service android:name="SendDataService" />
<receiver
android:name=".BootReciever">
<intent-filter>
<category android:name="android.intent.category.DEFAULT"/>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
</intent-filter>
</receiver>
You will need to add a boot receiver in your manifest like this
manifest:
<receiver android:name=".OnBootReceiver" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
</intent-filter>
</receiver>
And then create the boot receiver class like this...
receiver:
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class OnBootReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context ctxt, Intent intent) {
AlarmHelper.setAlarm(ctxt);
}
}
My alarm helper class is a simple start of day alarm like this...
alarm helper class:
public class AlarmHelper {
public static void testAlarm(Context context) {
Calendar when = Calendar.getInstance();
when.add(Calendar.SECOND, 10);
setAlarm(context, when);
}
public static void setAlarm(Context context) {
Calendar when = Calendar.getInstance();
when.add(Calendar.DAY_OF_YEAR, 1);
when.set(Calendar.HOUR_OF_DAY, 0);
when.set(Calendar.MINUTE, 0);
when.set(Calendar.SECOND, 0);
setAlarm(context, when);
}
#SuppressLint("SimpleDateFormat")
private static void setAlarm(Context context, Calendar when) {
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context.getApplicationContext());
Boolean showNotifications = prefs.getBoolean("PREF_SHOW_NOTIFICATIONS",
false);
if (showNotifications) {
AlarmManager am = (AlarmManager) context
.getSystemService(Context.ALARM_SERVICE);
am.setRepeating(AlarmManager.RTC_WAKEUP, when.getTimeInMillis(), AlarmManager.INTERVAL_DAY, getPendingIntent(context.getApplicationContext()));
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Log.i(TAG, "Alarm set " + sdf.format(when.getTime()));
}
}
I am trying to follow the example given here on running some code in fixed time intervals. I used the code in this example (setting the waiting time to 1 minute instead), compiled it, started in on my phone, stopped the application on the phone, and waited for several minutes.
However, no Toast was shown and neither any log-entry. I also notice that the Service.onStart seems depreciated.
Is something missing in the example? Do I need to register something when the main activity of the app is started? Or call it from somewhere else in my app? Or maybe something is wrong in the manifest?
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mypackage.test" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<application>
android:allowBackup="true"
android:icon="#mipmap/stoxx"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/Theme.AppCompat.Light" >
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".NewEntryActivity"
android:label="#string/menu_add"
android:theme="#style/AppTheme.NoActionBar"
/>
<activity
android:name=".UserSettingActivity"
android:label="#string/menu_add"
android:theme="#style/AppTheme.NoActionBar"
/>
<receiver
android:process=":remote"
android:name=".Alarm">
</receiver>
</application>
</manifest>
You forgot to include service in your Manifest. Here is all this project that works for me, check it.
Here is my manifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.alarmmanager.just_me.alarmmanager">
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<application android:allowBackup="true" android:label="#string/app_name"
android:icon="#mipmap/ic_launcher" android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".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:process=":remote" android:name=".Alarm"/>
<service android:name=".MyService"/>
</application>
Here is Alarm:
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, "com.alarmmanager.just_me.alarmmanager.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 * 5, pi); // Millisec * Second
}
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);
}}
Here is service:
public class MyService extends Service
{
Alarm alarm = new Alarm();
public void onCreate()
{
super.onCreate();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId)
{
Log.d("!~!", "Service started.");
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;
}
}
And the last one MainActivity:
public class MainActivity extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent(this, MyService.class);
startService(intent);
}
}
I have the AlarmMainActivity which broadcasts an intent at a time set by the alarm. And the receiver program AlarmReceiver should catch this intent and send a notification. From the log, I can see that the alarm is being set, but the receiver doesn't start and its not working. Can you look at my code below and please let me know why the BroadcastReceiver is not working. Thanks.
AlarmMainActivity:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alarm_main);
Intent alertIntent = new Intent(this, AlarmReceiver.class);
final PendingIntent pendingIntent =
PendingIntent.getBroadcast
(this,1,alertIntent,PendingIntent.FLAG_UPDATE_CURRENT);
final Button alarmButton = (Button)findViewById(R.id.alarm_button);
alarmButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Long alertTime = new
GregorianCalendar().getTimeInMillis()+5*1000;
Log.i(TAG,"Alarm will be sent at : "+ alertTime.toString());
AlarmManager am =
(AlarmManager)getSystemService(Context.ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP,alertTime,pendingIntent );
Log.i(TAG, "Alarm is now set");
}
});
}//oncreate
AlarmReceiver:
public class AlarmReceiver extends BroadcastReceiver{
private static final String TAG = "AlarmReceiver";
private String msgTitle, msgText, msgTicker;
#Override
public void onReceive(Context context, Intent intent) {
Log.i(TAG, "Entered AlarmReceiver()");
msgTitle = "Todays Weather";
msgText = "Its Sunny and Warm";
msgTicker="Alert";
PendingIntent notifyIntent = PendingIntent.getActivity(context,0, new
Intent(context, AlarmMainActivity.class),0);
NotificationCompat.Builder mBuilder = new
NotificationCompat.Builder(context).
setSmallIcon(R.drawable.weather_image).
setTicker(msgTicker).
setContentTitle(msgTitle).
setContentText(msgText).
setDefaults(NotificationCompat.DEFAULT_SOUND).
setAutoCancel(true).
setContentIntent(notifyIntent);
NotificationManager notificationManager =
(NotificationManager)context.getSystemService
(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1,mBuilder.build());
Log.i(TAG,"Notification Sent");
}
AndroidManifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.thirdlaw.alertalarm" >
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme"
android:debuggable="true">
<activity
android:name=".AlarmMainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<receiver android:name="com.thirdlaw.alertalarm.AlarmReceiver">
<intent-filter>
<action android:name="MY_ACTION_STRING"/>
</intent-filter>
</receiver>
</activity>
</application>
</manifest>
Remove the <receiver /> tag out of the <activity /> tag like :
<activity
android:name=".AlarmMainActivity"
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="com.thirdlaw.alertalarm.AlarmReceiver">
<intent-filter>
<action android:name="MY_ACTION_STRING"/>
</intent-filter>
</receiver>