package test.alarmmanager;

import java.util.Calendar;

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.widget.Button;

public class Test_AlarmmanagerActivity extends Activity {
    private Button mButton;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mButton = (Button) findViewById(R.id.button1);
        
        mButton.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                sendIntent();
                
                
            }
        });       
        
       
    }
    public void sendIntent() {
         Calendar cal = Calendar.getInstance();
            // add 5 minutes to the calendar object
            cal.add(Calendar.SECOND, 5);
            Intent intent = new Intent(this, AlarmReceiver.class);
            intent.putExtra("alarm_message", "O'Doyle Rules!");
            // In reality, you would want to have a static variable for the request code instead of 192837
            PendingIntent sender = PendingIntent.getBroadcast(this, 192837, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            
            // Get the AlarmManager service
            AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
            am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), sender);
        
    }
}

package test.alarmmanager;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
import android.os.Bundle;
 
public class AlarmReceiver extends BroadcastReceiver {
 
 @Override
 public void onReceive(Context context, Intent intent) {
   try {
     Bundle bundle = intent.getExtras();
     String message = bundle.getString("alarm_message");
     Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
     Toast.makeText(context, "There was an error somewhere, but we still received an alarm", Toast.LENGTH_SHORT).show();
     e.printStackTrace();
 
    }
 }
 
}

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

    <uses-sdk android:minSdkVersion="10" />
     <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" android:debuggable="true">
        <activity
            android:label="@string/app_name"
            android:name=".Test_AlarmmanagerActivity" >
            <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="AlarmReceiver"></receiver>
    </application>

</manifest>

<reciever android:process =":remote" android:name=".AlarmReciever" />