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Table 8.2 Returns void
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AlarmManager public methods
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Method and description cancel(PendingIntent intent) Remove alarms with matching Intent set(int type, long triggerAtTime, PendingIntent operation) Set an Alarm setRepeating(int type, long triggerAtTime, long interval, PendingIntent operation) Set a repeating Alarm setTimeZone(String TimeZone) Set the time zone for the Alarm
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You instantiate the AlarmManager indirectly (as you do the NotificationManager), by using Context.getSystemService(Context.ALARM_SERVICE). Setting alarms is easy, like most things in Android. In the next example, you ll create a simple application that sets an Alarm when a button is pressed. When the Alarm is triggered, it will pass back a simple Toast to inform us that the Alarm has been fired.
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Creating a simple alarm example
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In this next example, you re going to create an Android project called SimpleAlarm that has the package name com.msi.manning.chapter8.simpleAlarm, the application name SimpleAlarm, and the Activity name GenerateAlarm. In this project, we ll use another open source icon, which you can find at http://www.manning.com/ableson/ or in the download for this chapter. Change the name of the icon to clock, and add it to the res/drawable directory of the project when you create it. The next thing to do is edit the AndroidManifest.xml to have a receiver (we ll create that soon) called AlarmReceiver, as shown in the following listing.
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Notifications and alarms
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Listing 8.6
AndroidManifest.xml
< xml version="1.0" encoding="utf-8" > <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.msi.manning.chapter8.simpleAlarm"> <application android:icon="@drawable/clock"> <activity android:name=".GenerateAlarm" 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=".AlarmReceiver" android:process= ":remote" /> </application> </manifest>
Now we edit the string.xml file in the values directory and add two new strings:
<string name="set_alarm_text">Set Alarm</string> <string name="alarm_message">Alarm Fired</string>
We ll use this as the value of the button in our layout. Next, we need to add a new button to our layout, so edit the main.xml file to add a new button, like this:
<Button android:id="@+id/set_alarm_button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/set_alarm_text"> <requestFocus /> </Button>
We re ready to create a new class that will act as the Receiver for the Notification the Alarm will generate. In this case, we re going to be generating a Toast-style Notification to let the user know that the Alarm has been triggered. Now, create a new class as shown in the following listing. This class waits for the Alarm to broadcast to the AlarmReceiver and then generates a Toast.
Listing 8.7 AlarmReceiver.java
public class AlarmReceiver extends BroadcastReceiver { public void onReceiveIntent( Create Context context, Intent intent) { onReceiveIntent method Toast.makeText (context, R.string.app_name, Toast.LENGTH_SHORT).show(); Broadcast Toast } when Intent is @Override received public void onReceive(Context context, Intent intent) { } }
Next, we need to edit the SimpleAlarm class to create a button widget (as we discussed in chapter 3) that calls the inner class setAlarm. In setAlarm, we create an onClick
Introducing Alarms
method that will schedule our Alarm, call our Intent, and fire off our Toast. The following listing shows what the finished class should look like.
Listing 8.8 SimpleAlarm.java
public class GenerateAlarm extends Activity { Toast mToast; @Override protected void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); Button button = (Button)findViewById(R.id.set_alarm_button); button.setOnClickListener(this.mOneShotListener); } private OnClickListener mOneShotListener = new OnClickListener() { Set up Button to call public void onClick(View v) mOneShotListener { Intent intent = new Intent(GenerateAlarm.this, AlarmReceiver.class); Create Intent PendingIntent appIntent = to fire when PendingIntent.getBroadcast(GenerateAlarm.this, Alarm goes off 0, intent, 0); Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(System.currentTimeMillis()); calendar.add(Calendar.SECOND, 30); Create AlarmManager am = AlarmManager (AlarmManager)getSystemService(ALARM_SERVICE); am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), appIntent); if (GenerateAlarm.this.mToast != null) { GenerateAlarm.this.mToast.cancel(); } GenerateAlarm.this.mToast = Toast.makeText(GenerateAlarm.this, R.string.alarm_message, Toast.LENGTH_LONG); GenerateAlarm.this.mToast.show(); } }; }
As you can see, this class is pretty simple. We create a Button to trigger our Alarm B. Next, we create an inner class for our mOneShotListener. Then, we create the Intent to be triggered when the Alarm actually goes off C. In the next section of code, we use the Calendar class to help us calculate the number of milliseconds from the time the button is pressed, which we ll use to set the Alarm. Now we ve done everything necessary to create and set the Alarm. We create the AlarmManager D and then call its set() method to set the Alarm. To see a little more detail of what s going on in the application, take a look at these lines of code:
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE); am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), intent);
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