NotificationsAndAlarms

NotificationsAndAlarms - Notifications & Alarms...

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Unformatted text preview: Notifications & Alarms   Notifications   Alarms   Used to notify users of events   Three general forms of Notifications   Toast   Dialogs   Status Bar Notifications   Transitory messages that pop up on the current window   Automatically fade into &out of view   No user interaction or response   Instantiate a Toast object using makeText()   Parameters  ­ (context, text, duration)   Can create customized layouts in XML   Set them using Toast.setView() Context context = getApplicationContext(); CharSequence text = ”Message to Display"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); // Don’t forget to show it! I mess this up every time toast.show(); <LinearLayout … android:id="@+id/toast_layout_root” android:orientation="horizontal” android:layout_width="fill_parent” android:layout_height="fill_parent" android:padding="10dp” android:background="#7777” > <ImageView android:layout_width="wrap_content” android:layout_height="fill_parent” android:layout_marginRight="10dp” android:src="@drawable/fire_eye_alien” /> <TextView android:layout_width="wrap_content” android:layout_height="fill_parent” android:textColor="#FFF” android:text="I'm Watching You!” /> </LinearLayout> public class NotificationToastActivity extends Activity { public void onCreate(Bundle savedInstanceState) { … setContentView(R.layout.main); LayoutInflater inflater = getLayoutInflater(); View layout = inflater.inflate( R.layout.custom_toast, (ViewGroup) findViewById(R.id.toast_layout_root)); Toast toast = new Toast(getApplicationContext()); toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0); toast.setDuration(Toast.LENGTH_LONG); toast.setView(layout); toast.show(); } }   Created & displayed as part of an Activity   Shown & removed using showDialog() & dismissDialog()   Can define action to perform on dismissal using DialogInterface.OnDismissListener interface   void onDismiss(DialogInterface dialog)   See previous UI lesson for examples System service that manages Notifications     e.g., notify & cancel public static class MyService extends Service { private static final int NOTIFICATION_ONE = 1; … public void onStart(Intent intent, int startId) { … int icon = android.R.drawable.stat_sys_warning; CharSequence tickerText = "Notification"; long when = System.currentTimeMillis(); Notification notification = new Notification(icon, tickerText, when); … … Context context = getApplicationContext(); CharSequence contentTitle = "My Notification"; CharSequence contentText = "You've got notifications!"; Intent notificationIntent = new Intent(this,NotificationStatusBarActivity.class); PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0); notification.setLatestEventInfo( context, contentTitle, contentText,contentIntent); … … NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); mNotificationManager.notify(NOTIFICATION_ONE, notification); …   To use the user's default sound   notification.defaults |= Notification.DEFAULT_SOUND;   To use a different sound   notification.sound = Uri.parse("file:///sdcard/media/audio/ notifications/rooster_2.mp3");   To use the user's default vibration pattern   notification.defaults |= Notification.DEFAULT_VIBRATE;   To use a different vibration pattern   long vibrate = { 0, 100, 200, 300 };   notification.vibrate = vibrate;   Mechanism for broadcasting Intents at predetermined times   Used to start Activities at a specific time or perform actions at periodic time intervals   Once set, Alarms remain active even if target application is inactive or asleep   Can optionally be set to wake the device   Canceled on device shutdown/restart   Example methods         void cancel(PendingIntent operation) void set(int type, long triggerAtTime, PendingIntent operation) void setRepeating(int type, long triggerAtTime, long interval, PendingIntent operation) void setInexactRepeating(int type, long triggerAtTime, long interval, PendingIntent operation)   RTC_Wakeup   Wakes device, fires Intent at the specified clock time   RTC   Doesn’t wake device, fires Intent at the specified clock time   ELAPSED_REALTIME   Doesn’t wake device, fires Intent at the specified time (interpreted relative to time since last boot)   ELAPSED_REALTIME_WAKEUP   Wakes device, fires Intent at the specified time (interpreted relative to time since last boot) public void onCreate(Bundle savedInstanceState) { … alarmSetButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent intent1 = new Intent(AlarmCreateActivity.this,ScoldActivity.class); intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); PendingIntent sender1 = PendingIntent.getActivity( AlarmCreateActivity.this, 0, intent1, PendingIntent.FLAG_UPDATE_CURRENT); Intent intent2 = new Intent( AlarmCreateActivity.this,AlarmCancelReceiver.class); PendingIntent sender2 = PendingIntent.getBroadcast( AlarmCreateActivity.this, 0, intent2, PendingIntent.FLAG_UPDATE_CURRENT); … … AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE); Calendar cal = Calendar.getInstance(); am.setRepeating( AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(),10000, sender1); am.set( AlarmManager.RTC_WAKEUP, cal.getTimeInMillis() + 20000,sender2); … public class ScoldActivity extends Activity { protected void onCreate(Bundle savedInstanceState) { … Toast.makeText(this, "Are you playing Angry Birds again?", Toast.LENGTH_LONG).show(); } } public class AlarmCancelReceiver extends BroadcastReceiver { public void onReceive(Context context, Intent intent) { Intent newIntent = new Intent(context, ScoldActivity.class); PendingIntent sender = PendingIntent.getActivity( context, 0, newIntent, PendingIntent.FLAG_UPDATE_CURRENT); final AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); am.cancel(sender); } }   NotificationStatusBar   NotificationStatusBarWithCustomView   NotificationToast   AlarmCreateActivity ...
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This note was uploaded on 01/13/2012 for the course CMSC 436 taught by Professor Porter during the Fall '11 term at Maryland.

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