android
Madhukar Kunam 
Week7.pptxCOIT20270 Application Development for Mobile Platforms Week 7: SMS and email Messaging, Location Based Services
Dr. R. Balsys, CQU, 2018.
Source: Beginning Android Programming with Android Studio, J.F. DiMarzio, 2016
Week 7 – SMS and email Messaging
This week we:
Send SMS messages programmatically
Use the built in messaging application in our app
Receive SMS messages programmatically
Send emails from our applications
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CQU - COIT20270 Application Development for Mobile Platforms
SMS Messaging
SMS messaging is a “killer app” for mobile phones
SMS messaging has billions of users in todays world
Being able to send and receive SMS messages within our applications is an attractive proposition, e.g. tracker app
You can test SMS messaging on the simulator
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CQU - COIT20270 Application Development for Mobile Platforms
Switch to site and read through section. Do not follow any links
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Sending SMS Messages Programmatically
You need to set <uses-permission android:name=“android.permissions.SEND_SMS”/> in your Android Manifest file
You create an instance of the SmsManager class. When declaring the instance you must use the getDefault() method to get a SmsManager object
The sendTextMessage() method on the SmsManager instance object is used to send the message
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CQU - COIT20270 Application Development for Mobile Platforms
…sendTextMessage
sendTextMessage() has the following 5 parameters:
destinationAddress: phone number of recipient
scAddress: service Centre address or null for default
text: content of the SMS
sentIntent: pending intent to invoke when sent
deliveryIntent: pending intent to invoke when delivered
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CQU - COIT20270 Application Development for Mobile Platforms
Using Built-in SMS app
It is simple to invoke the built in SMS app from your app. When the SMS message is sent you return to your app
Create a new Intent instance with new Intent(android.content.Intent.ACTION-VIEW) as the constructor
The putExtra() method can then be used to load the “address”, “sms_body” and “text” fields of the SMS messenger app when it loads
You must also set the MIME type of the message using setType(“vnd.android-dir/mms-sms”)
The startActivity() method is invoked with the Intent instance as parameter to start the messenger app when the setup is complete
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CQU - COIT20270 Application Development for Mobile Platforms
Demonstrate and Explain how it works
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Receiving SMS Messages
You need to set <uses-permission android:name=“android.permissions.RECEIVE_SMS”/> in your Android Manifest file
Receiving SMS messages is done using a BroadcastReceiver object which allows you to receive Intents using sendBroadcast(), that allows you to handle an event raised by another application
To handle the event you override the onReceive() method
The SMS message is contained in the 2nd parameter of onReceive() (an Intent object)
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CQU - COIT20270 Application Development for Mobile Platforms
Explain how the files work
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…Receiving SMS Messages
SMS messages are stored in an Object array in PDU format. The message is split into 160 character sub-arrays
You extract the content using the static createFromPdu() method of the SmsMessage class
The phone number of the sender is found by calling the getOriginatingAddress() method and the body of the message is found using getMessageBody()
BroadcastReceiver’s remain running even when your app is not running and so can respond to events even when the app is not running
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CQU - COIT20270 Application Development for Mobile Platforms
Explain how the files work
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Preventing Messaging Apps from Receiving Messages
The default behavior is that your application and the built-in SMS app get any messages
To prevent another application from receiving the message use
<intent-filter android:priority=“100”/>
<action android:name= “android.provider.Telephony.SMS_RECEIVED” /></intent-filter>
in your Android manifest file and call abortBroacast() in your onReceive() event handler
This will permanently block all incoming SMS calls
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CQU - COIT20270 Application Development for Mobile Platforms
Explain how the files work
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Updating Activities from BroadcastReceiver
To display an SMS message in a TextView of your activity class you create a modified SMSReceiver class that listens for a new Intent type to use for the application, eg “MY_APP_RECEIVED”
Then you override the onReceive() method of your BroadcastReceiver object to display the SMS in the TextView
You need to create an IntentFilter object so you can listen for the Intent. This is done by adding your “MY_APP_RECEIVED” parameter when you call addAction() on your new IntentFilter instance
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CQU - COIT20270 Application Development for Mobile Platforms
Demonstrate and Explain how the files work
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…Updating Activities from BroadcastReceiver
You call registerReceiver() in onResume() and unregisterReceiver() in onPause() so the message is only updated when the Activity is running in the foreground
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CQU - COIT20270 Application Development for Mobile Platforms
Demonstrate and Explain how the files work
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If your activity is in the background when a message is received it is possible to automatically bring it to the foreground to display the message
Register your BroadcastReceiver in your activities onCreate() instead of in onResume() and unregister it in your onDestroy() event rather than the onPause() event
Then modify the onReceive() event using an Intent to bring the activity to the foreground by calling Intent’s setFlag(“Intent.FLAG_ACTIVITY_NEW_CLASS”) and then stating your Intent’s instance using startActivity()
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CQU - COIT20270 Application Development for Mobile Platforms
Invoking Activities from BroadcastReceiver
Demonstrate and Explain how the files work
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You also need to add the tag android:launchMode=“singleTask” to the activity section of your Android manifest file. This prevents a new instance of your application being launched whenever a message is received
Using SMS messaging inside your app has various legal and ethical considerations
Once your app is granted permission to send SMS’s the user gets no further indication that messaging and associated costs occur
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CQU - COIT20270 Application Development for Mobile Platforms
…Invoking Activities from BroadcastReceiver
Demonstrate and Explain how the files work
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Sending E-Mail
The Gmail/email app lets you configure e-mail accounts using POP3 or IMAP.
You can use the built-in app or send and receive e-mails programmatically
You use an Intent object to do this. Use the setData() method on your Intent instance variable and use Uri.parse(“mailto:”) as the parameter
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CQU - COIT20270 Application Development for Mobile Platforms
Demonstrate and Explain how the files work
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Sending E-Mail
Then use putExtra() with parameters
Intent.EXTRA_EMAIL , array of strings containing recipients addresses
Intent.EXTRA_CC, array of strings containing other recipients addresses
Intent.EXTRA_SUBJECT, string for the subject field of e-mail
Intent.EXTRA_TEXT, string containing the message
Set the Intent message type to “message/fc822” using the Intent setType() method
Call startActivity() with Intent.createChooser (your_intent_instance, “Email’) as parameter
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CQU - COIT20270 Application Development for Mobile Platforms
Demonstrate and Explain how the files work
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Week 7 – Location Based Services
Objectives, to:
Display Google maps in your app, with pan and zoom control, switching between views and to add markers to the maps
Getting address of locations tapped on a map
Performing geocoding and reverse geocoding
Getting geographical data using GPS, Cell-ID and Wi-Fi
Location monitor and build a location tracker app
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CQU - COIT20270 Application Development for Mobile Platforms
Location Based Services (LBS)
In recent times apps that take advantage of the current location of the mobile device have become popular
Use of location along with readily accessible maps allow for the integration of direction to the required service
Google maps integrates with the Android device allowing use of Google map and other services
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CQU - COIT20270 Application Development for Mobile Platforms
Displaying Maps
Google Maps comes bundle with the Android system
The textbook is out of date – we will be using Google Maps Android API v2
For up-to-date instructions on creating the project and obtaining the Maps API key see this weeks Lecture/Tutorial
The material in chapter 9 of the Lee text will only work if you have a real Android phone (v4 or later) to test the code on, otherwise you will need to create an Android Virtual device as described in the Lecture/Tutorial. The default display now shows the Zoom control automatically
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CQU - COIT20270 Application Development for Mobile Platforms
Changing Views
You can display Google maps in either maps view or satellite view
In some countries (US, France, UK, Australia and Canada) it is possible to display traffic conditions on the map in major cities
Green reflects smooth traffic flow, yellow moderate flow and red indicates traffic congestion
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CQU - COIT20270 Application Development for Mobile Platforms
Navigating to a Specific Location and Adding Location Markers
You can programmatically navigate to a specific location in the world
You can also place location markers at specific points on the map
See this weeks Lecture/Tutorial for details
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CQU - COIT20270 Application Development for Mobile Platforms
Eclipse (with Android additions) should already be installed in the labs, so these instructions are for installing on a students PC
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Getting Touch Location
You can find the latitude and longitude of a location touched on the display
From the latitude and longitude you can find the closest address – a process known as reverse geocoding
See this weeks Lecture/Tutorial for details
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CQU - COIT20270 Application Development for Mobile Platforms
Getting location programmatically
See this weeks Lecture/Tutorial for details
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CQU - COIT20270 Application Development for Mobile Platforms
