Android™ Application Development - Bahar Ali Khan

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Chapter 9: Peer-to-Peer Communication 296 To listen for incoming messages, register the Broadcast Receiver using an Intent Filter that listens for the android.provider.Telephony.SMS_RECEIVED action String, as shown in the code snippet below: final String SMS_RECEIVED = “android.provider.Telephony.SMS_RECEIVED”; IntentFilter filter = new IntentFilter(SMS_RECEIVED); BroadcastReceiver receiver = new IncomingSMSReceiver(); registerReceiver(receiver, filter); Simulating Incoming SMS Messages There are two techniques available for simulating incoming SMS messages in the emulator. The fi rst was described previoulsy in this section; you can send an SMS message from one emulator to another by using its port number as the destination address. Alternatively, you can use the Android debug tools introduced in Chapter 2 to simulate incoming SMS messages from arbitrary numbers, as shown in Figure 9-2. Figure 9-2 Handling Data SMS Messages For security reasons, the version 1 release has restricted access to receiving data messages. The following section has been left to indicate how likely future functionality may be made available. Data messages are received in the same way as a normal SMS text message and are extracted in the same way as shown in the above section. To extract the data transmitted within a data SMS, use the getUserData and getUserDataHeader methods, as shown in the following snippet: byte[] data = msg.getUserData(); SmsHeader header = msg.getUserDataHeader();
Chapter 9: Peer-to-Peer Communication The getUserData method returns a byte array of the data included in the message, while getUserDataHeader returns an array of metadata elements used to describe the data contained in the message. Emergency Responder SMS Example In this example, you’ll create an SMS application that turns an Android phone into an emergency response beacon. Once fi nished, the next time you’re in unfortunate proximity to an alien invasion or fi nd yourself in a robot-uprising scenario, you can set your phone to automatically respond to your friends’ and family members’ pleas for a status update with a friendly message (or a desperate cry for help). To make things easier for your would-be saviors, you’ll use location-based services to tell your rescuers exactly where to fi nd you. The robustness of SMS network infrastructure makes SMS an excellent option for applications like this where reliability and accessibility are critical. 1. Start by creating a new EmergencyResponder project that features an EmergencyResponder Activity. package com.paad.emergencyresponder; import java.io.IOException; import java.util.ArrayList; import java.util.Locale; import java.util.concurrent.locks.ReentrantLock; import java.util.List; import android.app.Activity; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.BroadcastReceiver; import android.content.SharedPreferences; import android.location.Address; import android.location.Geocoder; import android.location.Location; import android.location.LocationManager; import android.os.Bundle; import android.telephony.gsm.SmsManager; import android.telephony.gsm.SmsMessage; import android.view.View; import android.view.View.OnClickListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.ListView; public class EmergencyResponder extends Activity { @Override 297
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Professional Android Application su
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Professional Android Application D
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Professional Android Application D
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About the Author Originally from Pe
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Acknowledgments A big thank you goe
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Contents Chapter 2: Getting Started
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Contents xii Saving and Loading Fil
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Contents Chapter 10: Accessing Andr
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Introduction Now is an exciting tim
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Introduction covered, you can move
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Introduction At http://p2p.wrox.com
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Chapter 1: Hello, Android 2 Using t
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Chapter 1: Hello, Android An Open P
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Chapter 1: Hello, Android 6 ❑ ❑
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Chapter 1: Hello, Android 8 When ma
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Chapter 1: Hello, Android 10 In mar
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Chapter 1: Hello, Android 12 Each A
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Chapter 1: Hello, Android 14 ❑ Da
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Chapter 1: Hello, Android 16 ❑ an
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Getting Started All you need to sta
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Chapter 2: Getting Started Unless o
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Installing the ADT Plug-in Install
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Chapter 2: Getting Started 3. In th
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Chapter 2: Getting Started If every
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} lp = new LinearLayout.LayoutParam
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❑ ❑ ❑ ❑ ❑ Small screens w
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Chapter 2: Getting Started on how t
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Chapter 2: Getting Started To start
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Ensuring a Seamless User Experience
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Figure 2-11 Chapter 2: Getting Star
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} myListView.setAdapter(aa); Chapte
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Chapter 2: Getting Started A number
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Creating Applications and Activitie
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Chapter 3: Creating Applications an
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Creating Resources Chapter 3: Creat
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❑ ❑ #ARGB #ARRGGBB Chapter 3: C
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android:startOffset=”500” andro
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Referencing Resources in Resources
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} } Chapter 3: Creating Application
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Chapter 4: Creating User Interfaces
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Chapter 5: Intents, Broadcast Recei
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Data Storage, Retrieval, and Sharin
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Chapter 6: Data Storage, Retrieval,
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} Chapter 6: Data Storage, Retrieva
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} } } Chapter 6: Data Storage, Retr
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Querying Your Database Chapter 6: D
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} // Open or create the database to
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Adding, Updating, and Deleting Cont
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} } Chapter 6: Data Storage, Retrie
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} } break; Chapter 6: Data Storage,
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Maps, Geocoding, and Location-Based
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Chapter 7: Maps, Geocoding, and Loc
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} Chapter 7: Maps, Geocoding, and L
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Chapter 10: Accessing Android Hardw
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Chapter 11: Advanced Android Develo
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400 Android, getting started Androi
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402 databases databases creating ea
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404 interapplication communication
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406 passing custom class objects pa
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408 synchronizing threads synchroni
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Programmer to Programmer Get more
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Android™ Application Development - Bahar Ali Khan

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