Day 6: Android BroadcastReceiver Component

Apr 13, 2013Download as PPT, PDF4 likes12,199 views

BroadcastReceiver in Android: 1. How to respond to Intent broadcast 2. How to intercept incoming SMS 3. How to put an application in device startup

Android Application Development
Broadcast Receiver

Click to edit Master subtitle style

Ahsanul Karim
ahsanul.karim@sentinelbd.com
Sentinel Solutions Ltd.
http://www.sentinelbd.com
5/21/11

Application Building Blocks
ly Corresponding to one screen.

IntentReceiver Service Activity ContentProvider

ns or status changes.that runs in up your process. applications to share data.
Faceless task Can wake the background.
Enable

5/21/11

Android Application Anatomy
Activities Services
1. Provides User Interface 1. No User Interface
2. Usually represents a Single 2. Runs in Background
Screen
3. Extends the Service Base
3. Can contain one/more Views Class
4. Extends the Activity Base
class
Application= Set of Android Components

Intent/Broadcast Receiver Content Provider
1. Receives and Reacts to 1. Makes application data
broadcast Intents available to other apps
2. No UI but can start an 2. Data stored in SQLite database
Activity 3. Extends the ContentProvider
Base class
3. Extends the BroadcastReceiver
5/21/11 Base Class

Broadcast Receivers
1. A broadcast receiver is a component that responds to system-wide
Broadcast announcements.
1. Many broadcasts originate from the system—for example, a
Broadcast announcing that the screen has turned off, the battery
is low, or a picture was captured or an SMS is received.
1. Applications can also initiate broadcasts—for example, to let other
Applications know that some data has been downloaded to the
device and is available for them to use.
1. Although broadcast receivers don't display a user interface, they may
create a status bar notification to alert the user when a
broadcast event occurs.
1. More commonly, though, a broadcast receiver is just a "gateway" to
other components and is intended to do a very minimal amount of
work. For instance, it might initiate a service/or start an activity to
perform some work based on the event.
5/21/11

Android Application Anatomy

Activity 1 Activity 2

UI

Service BroadcastReceiver

Intents
1. Directed Intents
2. Broadcast Intents OS

BIG PICTURE
5/21/11

Broadcast Receivers
1. We’ll use a Broadcast Receiver to capture SMS receive event
2. We capture the SMS receive event and launch an Activity to show the sms and give user
an option to reply the SMS
Activity

OS BroadcastReceiver

5/21/11

Broadcast Receivers
1. Create a new project BroadcastReceiverDemo
2. A broadcast receiver is implemented as a subclass of BroadcastReceiver and each
broadcast is delivered as an Intent object. In this case the intent is detected by
android.provider.Telephony.SMS_RECEIVED

To do this we’ll create a class SMSReceiver that extends BroadcastReceiver class and
define the method onReceive()

BroadcastReceiver

5/21/11

Broadcast Receivers (Contd.)
3. We also need to add SMSReceiver as receiver of a particular Intent (SMS received)
which is identified by android.provider.Telephony.SMS_RECEIVED

BroadcastReceiver

5/21/11

Broadcast Receivers (Contd.)
4. Also we have to add permission for receiving SMS

BroadcastReceiver

5/21/11

Broadcast Receivers (Contd.)
5. Now we run the application
6. Now we use emulator control to send sms

5/21/11

Sending SMS
1. Add permission in menifest.xml

2. We add the following code for sending SMS from anywhere of our application

5/21/11

Exercise

We’ll create a replica of SMS application of Android

1. Application will have a basic TabActivity with 3 tabs (Activities)
1. Send- will give user option to send sms (2 input fields for number and text)
All sent SMS will be saved in database
1. Inbox- (List Activity) which will fetch all received SMS from database
2. Sent- (ListActivity) which will fetch all sent SMS
1. A broadcast receiver which will receive SMS and save them to database

5/21/11

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The document discusses ListViews and ListActivities in Android. It covers: 1) Using the ListView and ListActivity classes to display scrollable lists of data from an Adapter. 2) Developing custom Adapters by extending the BaseAdapter class to provide data and convert it to list item views. 3) Techniques like view recycling and ViewHolders to improve ListView performance with large datasets. 4) Examples of creating ListActivities with ArrayAdapters, custom row layouts, and handling click/long click events.

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The document describes the activity lifecycle in Android, including key methods like onCreate(), onResume(), onPause(), onStop(), and onDestroy(). It explains that onCreate() initializes the activity, onResume() makes it interactive, onPause() pauses it on switching to another activity, onStop() ends visibility, and onDestroy() ends the activity. It also provides examples of how to start a new activity using an intent and how to pass data between activities.

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The document discusses Android application development and activities. It covers: - The structure of Android applications which typically consist of multiple activities with one specified as the main activity in the Android manifest. - Activities provide an interactive screen for users to perform tasks. Creating an activity involves subclassing the Activity class and implementing callback methods like onCreate. - The user interface of an activity is defined through layouts which can be accessed from the activity class. - Activities can transition to one another using intents, by calling startActivity and passing an intent specifying the destination activity class. - An example is provided to create a registration and login activity, demonstrating how to add activities and navigate between them using intents

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