Lecture 9 Notifications , Dialogs and Media

8/13/2019 Lecture 9 Notifications , Dialogs and Media

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Lecture 9LECTURE 9 NOTIF ICATIONS , DIALOGS AND MEDIA





Notifications



Status Notification•adds an icon with a message to the system's status bar and a notification message in thenotifications window.

•When the user selects the notification, Android fires an Intent that is defined by theNotification

•You can also configure the notification to alert the user with a sound, a vibration, and flashinglights on the device.



Hint : Service and Notification•A background service should never launch an activity on its own in order to receive uinteraction. The service should instead create a status notification that will launch the activitywhen selected by the user.



Code SampleNotificationManager mNotificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);

Notification notification = new Notification(icon, tickerText, when);

Intent notificationIntent = new Intent(this, MyAlarmService.class);

PendingIntent contentIntent = PendingIntent.getService( this, 0, notificationIntent, 0);

notification.setLatestEventInfo( this, contentTitle, contentText, contentIntent);

mNotificationManager.notify(HELLO_ID, notification);



Setting Sound for the notificationnotification.sound =

Uri.parse (“file/// sdcard /myfile.mp3”);

or

notification.sound = Uri.parse("android.resource://" + getPackageName() +"/"+ R.raw.mafile)



More about notifications• http://developer.android.com/guide/topics/ui/notifiers/notifications.htm

http://developer.android.com/guide/topics/ui/notifiers/notifications.htm








Dialogs



Dialogs•A dialog is usually a small window that appears in front of the current Activity.

•The underlying Activity loses focus and the dialog accepts all user interaction.

• AlertDialog

• ProgressDialog

• DatePickerDialog

• TimePickerDialog



Showing Dialogs•Override onCreateDialog(int id) method to initialize and create dialogs

•Use showDialog(int id) to show specific dialog



Alert DialogAlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setMessage("Are you sure you want to exit?");

builder.setPositiveButton("Yes", new DialogInterface.OnClickListener()

{

public void onClick(DialogInterface dialog, int id)

{}

});

AlertDialog alert = builder.create(); alert.show();



Alert Dialog : ListAlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setTitle("Pick a color");

builder.setItems(items, new DialogInterface.OnClickListener()

{public void onClick(DialogInterface dialog, int item){

Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();

}});

AlertDialog alert = builder.create();

alert.show();



Showing Optionsbuilder.setSingleChoiceItems(items, -1,

new DialogInterface.OnClickListener()

{

public void onClick(DialogInterface dialog, int item)

{

Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();}

});



Progress Dialog



See More About Dialogs• http://developer.android.com/guide/topics/ui/dialogs.html

http://developer.android.com/guide/topics/ui/dialogs.html






Media





Playing a VideoVideoView ve = (VideoView)findViewById(R.layout.vidview);

ve.setMediaController( new MediaController(getApplicationContext()));

ve.setVideoURI(Uri.parse("android.resource://" + getPackageName() +"/"+ R.raw.vid));

ve.start();

ve.requestFocus();



Using The Camera

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);



Animation•Frame By frame Animation

•Tweens Animation

–Scale

–Rotate



Frame By Frame



Tween Animation<set android:interpolator="@android:anim/accelerate_interpolator">

<scale

android:fromXScale=" 1.4“

android:toXScale="0.0"

android:fromYScale="0.6"

android:toYScale="0.0"

android:pivotX="50%"

android:pivotY="50%"

android:duration=" 400“

android:startOffset="700"/>

</set>



See More about Animations•http://developer.android.com/guide/topics/resources/animation -resource.html

http://xn--http-4b7a/developer.android.com/guide/topics/resources/animation-resource.html






Lecture 9 Notifications , Dialogs and Media

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