Android Programming Tutorials

Now, Your Friends Are Alarmed

To obtain the JAR containing WakefulIntentService, you can either

download the source code from its GitHub repository and run ant jar to

build it, or you can download a pre-compiled JAR from that GitHub

repository's "Downloads" area, or you can get the JAR out of the source

code for this book in the 30-SysSvcs edition of the Patchy project.

Either way, once you have the JAR, put it in your libs/ directory.

Step #2: Create a Layout....................................................................

In order to receive alarms from the AlarmManager, we need a

BroadcastReceiver registered in our AndroidManifest.xml file. This

BroadcastReceiver, in turn, needs to start our PostMonitor service, in case it

is not running, and to let it know that a poll is required.

Create Patchy/src/apt/tutorial/two/OnAlarmReceiver.java with the

following implementation:

package apt.tutorial.two;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.util.Log;

import com.commonsware.cwac.wakeful.WakefulIntentService;

public class OnAlarmReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

Intent i=new Intent(context, PostMonitor.class);

i.setAction(PostMonitor.POLL_ACTION);

WakefulIntentService.sendWakefulWork(context, i);

}

}

Then, add it to AndroidManifest.xml, along with the WAKE_LOCK permission we

need in order to use a WakeLock:

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

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