Android Application Component: BroadcastReceiver Tutorial
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This document discusses Android broadcast receivers. It explains that a broadcast receiver is a component that responds to system-wide broadcast announcements. Many broadcasts originate from the system, like when the screen turns off or a picture is captured. Applications can also initiate broadcasts. The document provides an example of creating a broadcast receiver to handle the android.provider.Telephony.SMS_RECEIVED broadcast and launch an activity when an SMS is received. It also discusses how to add permissions to receive SMS and how to send SMS from an application. It proposes an exercise to create a basic SMS application with tabs for send, inbox, and sent that uses a broadcast receiver to receive and save SMS to a database.
![Receiving SMSBundle bundle = intent.getExtras(); SmsMessage[] msgs = null;String str = "";String address="";if (bundle != null){//---retrieve the SMS message received---Object[] pdus = (Object[]) bundle.get("pdus");msgs = new SmsMessage[pdus.length];for (int i=0; i<msgs.length; i++) {msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]); str += "SMS from " + msgs[i].getOriginatingAddress(); str += " :";str += msgs[i].getMessageBody().toString();str += "\n"; address=msgs[i].getOriginatingAddress();Toast.makeText(context, str, Toast.LENGTH_LONG).show(); }](https://image.slidesharecdn.com/android1-6broadcastreceiver-110822085252-phpapp01/85/Android-Application-Component-BroadcastReceiver-Tutorial-11-320.jpg)
Android Application Component: BroadcastReceiver Tutorial
- 1. Android Application DevelopmentBroadcast ReceiverAhsanul Karimahsanul.karim@sentinelbd.comSentinel Solutions Ltd.http://www.sentinelbd.com
- 3. Android Application AnatomyActivitiesProvides User InterfaceUsually represents a Single ScreenCan contain one/more ViewsExtendsthe Activity Base classServicesNoUser InterfaceRuns in BackgroundExtends the Service Base ClassIntent/Broadcast ReceiverReceives and Reacts to broadcast IntentsNo UI but can start an ActivityExtends the BroadcastReceiver Base ClassContent ProviderMakes application data available to other appsData stored in SQLite databaseExtends the ContentProviderBase classApplication= Set of Android Components
- 4. Broadcast ReceiversA broadcast receiver is a component that responds to system-wide Broadcast announcements. 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. 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. 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. 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. Android Application AnatomyActivity 1 Activity 2 BroadcastReceiverServiceUIOSIntentsDirected IntentsBroadcast IntentsBIG PICTURE
- 6. Broadcast ReceiversActivityWe’ll use a Broadcast Receiver to capture SMS receive eventWe capture the SMS receive event and launch an Activity to show the sms and give user an option to reply the SMSBroadcastReceiverOS
- 7. Broadcast ReceiversCreate a new project BroadcastReceiverDemoA 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_RECEIVEDTo do this we’ll create a class SMSReceiver that extends BroadcastReceiver class and define the method onReceive()BroadcastReceiver
- 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_RECEIVEDBroadcastReceiver
- 9. Broadcast Receivers (Contd.)4. Also we have to add permission for receiving SMSBroadcastReceiver
- 10. Broadcast Receivers (Contd.)5. Now we run the application6. Now we use emulator control to send sms
- 11. Receiving SMSBundle bundle = intent.getExtras(); SmsMessage[] msgs = null;String str = "";String address="";if (bundle != null){//---retrieve the SMS message received---Object[] pdus = (Object[]) bundle.get("pdus");msgs = new SmsMessage[pdus.length];for (int i=0; i<msgs.length; i++) {msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]); str += "SMS from " + msgs[i].getOriginatingAddress(); str += " :";str += msgs[i].getMessageBody().toString();str += "\n"; address=msgs[i].getOriginatingAddress();Toast.makeText(context, str, Toast.LENGTH_LONG).show(); }
- 12. Sending SMS1. Add permission in menifest.xml2. We add the following code for sending SMS from anywhere of our application
- 13. ExerciseWe’ll create a replica of SMS application of AndroidApplication will have a basic TabActivity with 3 tabs (Activities)Send- will give user option to send sms (2 input fields for number and text)All sent SMS will be saved in databaseInbox- (List Activity) which will fetch all received SMS from databaseSent- (ListActivity) which will fetch all sent SMSA broadcast receiver which will receive SMS and save them to database