Day 6: Android BroadcastReceiver Component
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The document outlines the components of Android application development, focusing on broadcast receivers, which respond to system-wide announcements and allow applications to react to events like SMS reception. It describes the anatomy of an Android application, including activities, services, content providers, and the implementation of broadcast receivers to handle SMS messages. Additionally, it provides a basic exercise to create an SMS application that includes sending and receiving messages while storing them in a database.
Day 6: Android BroadcastReceiver Component
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. Android Application Anatomy Activity 1 Activity 2 UI Service BroadcastReceiver Intents 1. Directed Intents 2. Broadcast Intents OS BIG PICTURE 5/21/11
- 6. 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
- 7. 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
- 8. 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
- 9. Broadcast Receivers (Contd.) 4. Also we have to add permission for receiving SMS BroadcastReceiver 5/21/11
- 10. Broadcast Receivers (Contd.) 5. Now we run the application 6. Now we use emulator control to send sms 5/21/11
- 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
- 12. 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