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Android

Notifications

23

Victor Matos

Cleveland State University

Notes are based on:

Android Developers

http://developer.android.com/index.html 222

20. Android -NotificationsNotifications

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What is a Notification?

A notificationis a short message briefly displayed on the status line. It typically announces the happening of an special event for which a trigger has been set. After opening the Notification Panelthe user may choose to click on a selection and execute an associated activity. 333

20. Android -NotificationsNotifications

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What is a Notification?

Notification shown

on the status line

Drag down

Click on

Notification

Panel to

execute associated application 444

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Notification Manager

This class notifies the user of events that happen in the background.

Notifications can take different forms:

1.A persistent icon that goes in the status bar and is accessible through the

launcher, (when the user selects it, a designated Intent can be launched),

2.Turning on or flashing LEDs on the device, or

3.Alerting the user by flashing the backlight, playing a sound, or vibrating.

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Notification Manager

You do not instantiate this class directly; instead, retrieve it through getSystemService( String ).

Example:

String servName= Context.NOTIFICATION_SERVICE;

notificationManager= (NotificationManager) getSystemService(servName); 666

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Notification

This class represents how a persistent notification is to be presented to the user using the NotificationManager. public Notification(inticon, CharSequencetickerText, long when)

Parameters

iconThe resource id of the icon to put in the status bar. tickerTextThe text that flows by in the status bar when the notification first activates. whenThe time to show in the time field.

In the System.currentTimeMillistimebase.

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Notification -Methods

public void notify(intid, Notification notification) Places a persistent notification on the status bar.

Parameters

idAn identifier for this notification unique within your application. notificationA Notification object describing how to notify the user, other than the view you're providing.

Must not be null.

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Notification -Methods

public void setLatestEventInfo(

Context context, CharSequencecontentTitle,

CharSequencecontentText, PendingIntentcontentIntent) Sets the contentViewfield to be a view with the standard "Latest Event" layout.

Parameters

context The context for your application / activity. contentTitleThe title that goes in the expanded entry. contentTextThe text that goes in the expanded entry. contentIntentThe intent to launch when the user clicks the expanded notification. 999

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Notification -Methods

public void cancel ( intid ) public void cancelAll( ) Cancel a previously shown notification. If it's transient, the view will be hidden. If it's persistent, it will be removed from the status bar.

Parameters

IdAn identifier for this notification unique within your application.

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Example.

Produce a notification. Allow the user to click on the Notification Panel and execute appropriate activity to attend the message.

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Example -Layouts

main.xmlmain2.xml

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Example -Manifest/drawable

btn_star_big_on_selected.png Note:

Obtain the icon from the folder

C:\Android\platforms\android-

1.x\data\res\drawable

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Example -Create & Cancel a Notification

packagecis493.demos; importandroid.app.Activity; importandroid.app.Notification; importandroid.app.NotificationManager; importandroid.app.PendingIntent; importandroid.content.Context; importandroid.content.Intent; importandroid.os.Bundle; importandroid.view.View; importandroid.view.View.OnClickListener; importandroid.widget.*; publicclassNotifyDemo1 extendsActivity {

Button btnGo;

Button btnStop;

intnotificationId= 1;

NotificationManagernotificationManager;

@Override publicvoidonCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main);

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Example -Create & Cancel a Notification

btnGo= (Button)findViewById(R.id.btnGo); btnGo.setOnClickListener(newOnClickListener() { publicvoidonClick(View v) { //define a notification manager

String serName= Context.NOTIFICATION_SERVICE;

notificationManager= (NotificationManager)getSystemService(serName); //define notification using: icon, text, and timing. inticon = R.drawable.btn_star_big_on_selected; String tickerText= "1. My Notification TickerText"; longwhen = System.currentTimeMillis(); Notification notification= newNotification(icon, tickerText, when); //configure appearance of the notification

String extendedTitle= "2. My Extended Title";

String extendedText= "3. This is an extended and very important message"; // set a Pending Activity to take care of the potential request the user // may have by clicking on the notification asking for more explanations Intentintent= newIntent(getApplicationContext(), NotifyHelper.class); intent.putExtra("extendedText", extendedText); intent.putExtra("extendedTitle", extendedTitle);

PendingIntentlaunchIntent=

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Example -Create & Cancel a Notification

extendedTitle, extendedText, launchIntent); //trigger notification notificationId= 1; notificationManager.notify(notificationId, notification); }//click btnStop= (Button)findViewById(R.id.btnStop); btnStop.setOnClickListener(newOnClickListener() { publicvoidonClick(View v) { //canceling a notification notificationId= 1; }//onCreate }//NotifyDemo1

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Example -SubActivity-Attending the Notification

packagecis493.demos; importandroid.app.Activity; importandroid.content.Intent; importandroid.os.Bundle; importandroid.widget.Toast; publicclassNotifyHelperextendsActivity { @Override protectedvoidonCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main2);

Intent myData= getIntent();

// extract the extra-data in the Notification String msg= myData.getStringExtra("extendedTitle") + "\n" + myData.getStringExtra("extendedText"); Toast.makeText(getApplicationContext(), msg, 1).show(); 1717

20. Android -Notifications Notifications

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Questions

quotesdbs_dbs14.pdfusesText_20

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