Recognize/React on incoming SMS

plusminus · by **plusminus** » Sun Dec 16, 2007 11:24 pm

This Tutorial was inspired by the nice, but almost uncommented davanum Apache Blog.

What you will learn: You will learn how to recognize/react on incoming SMS by using a IntentReceiver. A possible scenario is, to play a music when there is an incoming SMS or modify the SMS.

:idea:

Designed/Tested with sdk-version: m5-rc14

:?:

Problems/Questions: Write it right below...

Difficulty: 2 of 5

What it will look like:

Think away the 'compressed' as this screenshot is from my sms-compression app

Screenshot was taken with sdk-version m3 (m5 looks similar)

Description:
0.)What we want to do is to react on the Intent "android.provider.Telephony.SMS_RECEIVED", which is fired by the System when there is an Incoming SMS. This will be done by an 'passive' IntentReceiver. This IntentReceiver will show a Notification (like in the picture above) and start a Main-Activity afterwards.

Note that we require a permission in the AndroidManufest.xml to receive the incoming sms:

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<uses-permission android:name="android.permission.RECEIVE_SMS" /> 
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This is the full AndroidManufest.xml:

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.anddev.android.smsexample">
    <uses-permission android:name="android.permission.RECEIVE_SMS" /> 
    <application android:icon="@drawable/icon">
        <!-- The Main Activity that gets started by the IntentReceiver listed below -->
        <activity android:name=".SMSActivity" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!-- This class will react on the SMS show a notification 
                        and start the Main-App afterwards -->
        <receiver android:name=".SMSReceiver">
            <intent-filter>
                <action android:name="android.provider.Telephony.SMS_RECEIVED" />
            </intent-filter>
        </receiver>    
    </application>
</manifest> 
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1.)So we now need to implement the IntentReceiver we call "SMSReceiver" and the MainActivity we call "SMSActivity".

Lets workout the "SMSReceiver" first:
The uninteresting parts first:

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package org.anddev.android.smsexample;
 
import android.app.NotificationManager;
import android.content.Context;
import android.content.Intent;
import android.content.IntentReceiver;
import android.os.Bundle;
import android.provider.Telephony;
import android.telephony.gsm.SmsMessage;
import android.util.Log;
 
public class SMSReceiver extends IntentReceiver {
        /** TAG used for Debug-Logging */ 
        private static final String LOG_TAG = "SMSReceiver";
 
        /** The Action fired by the Android-System when a SMS was received. 
         * We are using the Default Package-Visibility */ 
        private static final String ACTION = "android.provider.Telephony.SMS_RECEIVED";
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:idea: This is the method, that is called when the IntentReceiver is 'invoked' by the System. This just happens, becuase we exposed this Class in the AndroidManifest.xml :idea:

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        // @Override
        public void onReceiveIntent(Context context, Intent intent) {
                if (intent.getAction().equals(ACTION)) {
                        // if(message starts with SMStretcher recognize BYTE)
                        StringBuilder sb = new StringBuilder();
                        
                        /* The SMS-Messages are 'hiding' within the extras of the Intent. */
                        Bundle bundle = intent.getExtras();
                        if (bundle != null) {
                                /* Get all messages contained in the Intent*/
                                SmsMessage[] messages = 
                                        Telephony.Sms.Intents.getMessagesFromIntent(intent);
                                
                                /* Feed the StringBuilder with all Messages found. */
                                for (SmsMessage currentMessage : messages){
                                        sb.append("Received compressed SMSnFrom: ");
                                        /* Sender-Number */
                                        sb.append(currentMessage.getDisplayOriginatingAddress());
                                        sb.append("n----Message----n");
                                        /* Actual Message-Content */
                                        sb.append(currentMessage.getDisplayMessageBody());
                                }
                        }
                        /* Logger Debug-Output */
                        Log.i(LOG_TAG, "[SMSApp] onReceiveIntent: " + sb);
 
                        /* Show the Notification containing the Message. */ 
                        Toast.makeText(context, sb.toString(), Toast.LENGTH_LONG).show();
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Finally we start the Main-Activity doing the following:

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                        /* Start the Main-Activity */
                        Intent i = new Intent(context, SMSActivity.class);
                        i.setLaunchFlags(Intent.NEW_TASK_LAUNCH);
                        context.startActivity(i); 
                }
        }
}
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2.) The SMSActivity can be everything that comes to your mind, like a little MusicPlayer, a SMS-Storage-App, a... EVERYTHING you can imagine

Im using this code for the SMS-Compression-App i'll publicize when its ready

:) So thats it. I hope I could help you.

Regards,
plusminus

kadair · by **kadair** » Mon Dec 17, 2007 1:02 am

This is exactly what I was looking for--it works great!

Thanks again,
Ken

tum0rc0re · by **tum0rc0re** » Mon Dec 17, 2007 6:48 am

Thanks, buddy

It's excellent tutorial

Lex · by **Lex** » Mon Dec 17, 2007 10:16 pm

Thank you ! Keep up the good work !

venkat · by **venkat** » Tue Dec 18, 2007 5:09 am

Dear Plusminus, Nice work you have done.
i copied your code and i have created one activity which displays "SMSRecived".
when i run my program it is showing one error activity not defined by the manifest, also i have attached screen shot of the error and aslo i have attached my full coding, take a look.

Thanks and regards,
venkat

kadair · by **kadair** » Tue Dec 18, 2007 5:16 am

Hi Venkat,

Would you mind posting your Android manifest file? For some reason I'm having issues downloading the source. Without looking at it, I would suggest double checking the packages in the manifest and if everything looks okay there, you may just need to delete your run configurations for that project. If you're not sure how to do that let me know and I can post a quick example.

I'll also try to download the source again so that I can take a closer look.

Regards,
Ken

venkat · by **venkat** » Tue Dec 18, 2007 5:33 am

Hi kadair

Thanks for ur reply, i don't how to delete run configuration for that project. i hava attached mysource once again. try to download new one.

regads,
venkat

kadair · by **kadair** » Tue Dec 18, 2007 5:48 am

Venkat,

I was able to download and run your source this time. Go ahead and right-click on your project (SMSReceiver) in Eclipse. Select "Run As...", then the "Open Run Dialog..." option. You should see a pop-up that says "Create, manage, and run configurations" at the top. You need to select all of the projects under "Android Application" in the left menu and then click on the red "X" above. It will delete all of your "run configurations" for all of your Android projects. I would post some images if I had more time. Please feel free to shoot me a private message if you need further assistance. Hopefully, this will take care of you though.

Regards,
Ken

venkat · by **venkat** » Tue Dec 18, 2007 5:53 am

Hi kadair,
now it works fine. thanks for ur help.

Thank you very much once again.

Regads,
venkat.

Nitinkcv · by **Nitinkcv** » Sat Dec 22, 2007 7:13 pm

Hi all,

Was just wondering whether the updated SDK allows us to send out SMS's.

Thanks,
Nitin

plusminus · by **plusminus** » Sun Dec 23, 2007 2:55 pm

Hello Nitinkcv,

basically it is possible. There is a :src: SMSManager providing the following function:

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 public void sendTextMessage(String destinationAddress, String scAddress, String text, Intent sentIntent, Intent deliveryIntent, Intent failedIntent)
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But how to send an SMS without a GSM-Connection

The Emulator probably simulates a success or a failure ... haven't tried it yet. So I cannot say if this funcitonality is already full impelmented.

Regards,
plusminus

mjpan · by **mjpan** » Fri Dec 28, 2007 7:59 am

thanks for the great tutorial.

one question, though. right now you simply use a NotificationManager to display the incoming text message. How can the message be passed to the Activity :?:

currently i have an activity, which is put onPause(), and using the IntentReceiver, is resumed through onResume(). the Activity's mIntent, however, has null as the extras bundle, despite my having explicitly put it into the extras via intent.putExtras(bundle). perhaps because the activity was on pause, its mIntent is the one that originally created it, and not the one that resumed it :?:

plusminus · by **plusminus** » Fri Dec 28, 2007 1:52 pm

Hello mjpan,

mjpan wrote:Perhaps because the activity was on pause, its mIntent is the one that originally created it, and not the one that resumed it

Don't think so, because Intents "die" after being used.

What do you mean with "mIntent" :?:

== this.getIntent() :?:

Try putting some invented Category to the Intent and check if it arrives at the other side of the 'tunnel'. Like:

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        i.addCategory("MY_CATEGORY");
 
        // And on the other side of the road:
 
        for(String s : this.getIntent().getCategories())
 
                Log.d("CATEGORY_TAG", "CAT= " + s);
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Regards,
plusminus

mjpan · by **mjpan** » Fri Dec 28, 2007 6:06 pm

Hi plusminus,
Thanks for getting back to me. Yes, by mIntent, i mean this.getIntent(), where "this" is the Activity being resumed. I'm using the debugger to inspect the objects, and "mIntent" is the name of the member field of the Activity object. I have also verified (using the debugger) that if my application is NOT running, then mIntent.getExtras() is the one created in SMSReceiver, while if application is already running, then mIntent.getExtras() is null. Do you know how to open a ticket against this bug in Android?
Thx
mjpan

plusminus wrote:Hello mjpan,

What do you mean with "mIntent" == this.getIntent()

Try putting some invented Category to the Intent and check if it arrives at the other side of the 'tunnel'. Like:

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i.addCategory("MY_CATEGORY");

// And on the other side of the road:

for(String s : this.getIntent().getCategories())

Log.d("CATEGORY_TAG", "CAT= " + s);

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Regards,
plusminus

plusminus · by **plusminus** » Fri Dec 28, 2007 6:10 pm

Hello mjpan,

did you try the Category-Thing :?:

There is no official Bug-Tracking-System yet, but on my Bugs posting them to the GoogleGroups and hoping a moderator would see them was fine ^^.

Regards,
plusminus

Recognize/React on incoming SMS

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