Is it possible to read incoming sms and reply back only to specific or desire number

Question

Is it possible to read incoming sms and reply back only to specific or desire number. i-e i want to make app that will run in back ground ... whenever i will send sms with my number it will automatically respond back to me with XYZ information

Answer 1

Yes, it's possible. You need to add a BroadcastReceiver in your app that will intercept incoming SMS messages and then send a message if it matches the number you're looking for.

Following source code from:
BroadcastReceiver + SMS_RECEIVED
http://shreymalhotra.me/blog/tutorial/receive-sms-using-android-broadcastreceiver-inside-an-activity/

In AndroidManifest.xml:

<receiver android:name=".SMSReceiver"> 
  <intent-filter android:priority="999"> 
    <action android:name="android.provider.Telephony.SMS_RECEIVED" /> 
  </intent-filter> 
</receiver>

<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.SEND_SMS" />

In a new file called SMSReceiver.java:

public class SMSReceiver extends BroadcastReceiver 
{ 
    @Override 
    public void onReceive(Context context, Intent intent) { 
        // get SMS data, if bundle is null then there is no data so return
        Bundle extras = intent.getExtras();
        if (extras == null) return;

        // extract SMS data from bundle
        Object[] pdus = (Object[]) extras.get("pdus");
        for (int i = 0; i < pdus.length; i++) {
            SmsMessage SMessage = SmsMessage.createFromPdu((byte[]) pdus[i]);
            String sender = SMessage.getOriginatingAddress();
            String body = SMessage.getMessageBody().toString();

            // if there's an SMS from this number then send
            if(sender.equals("+1800555555") {
                SmsManager smsManager = SmsManager.getDefault();
                smsManager.sendTextMessage(sender, null, "sms received", null, null);
            }
        }
    }
}