Create Pdu for Android That Works with Smsmessage.Createfrompdu() (Gsm 3Gpp)

Create PDU for Android that works with SmsMessage.createFromPdu() (GSM 3gpp)

Maybe this snippet doesn't have many detail fields like you want but for my simple purpose it can invoke notification like another sms.

    private static void createFakeSms(Context context, String sender,
        String body) {
    byte[] pdu = null;
    byte[] scBytes = PhoneNumberUtils
            .networkPortionToCalledPartyBCD("0000000000");
    byte[] senderBytes = PhoneNumberUtils
            .networkPortionToCalledPartyBCD(sender);
    int lsmcs = scBytes.length;
    byte[] dateBytes = new byte[7];
    Calendar calendar = new GregorianCalendar();
    dateBytes[0] = reverseByte((byte) (calendar.get(Calendar.YEAR)));
    dateBytes[1] = reverseByte((byte) (calendar.get(Calendar.MONTH) + 1));
    dateBytes[2] = reverseByte((byte) (calendar.get(Calendar.DAY_OF_MONTH)));
    dateBytes[3] = reverseByte((byte) (calendar.get(Calendar.HOUR_OF_DAY)));
    dateBytes[4] = reverseByte((byte) (calendar.get(Calendar.MINUTE)));
    dateBytes[5] = reverseByte((byte) (calendar.get(Calendar.SECOND)));
    dateBytes[6] = reverseByte((byte) ((calendar.get(Calendar.ZONE_OFFSET) + calendar
            .get(Calendar.DST_OFFSET)) / (60 * 1000 * 15)));
    try {
        ByteArrayOutputStream bo = new ByteArrayOutputStream();
        bo.write(lsmcs);
        bo.write(scBytes);
        bo.write(0x04);
        bo.write((byte) sender.length());
        bo.write(senderBytes);
        bo.write(0x00);
        bo.write(0x00); // encoding: 0 for default 7bit
        bo.write(dateBytes);
        try {
            String sReflectedClassName = "com.android.internal.telephony.GsmAlphabet";
            Class cReflectedNFCExtras = Class.forName(sReflectedClassName);
            Method stringToGsm7BitPacked = cReflectedNFCExtras.getMethod(
                    "stringToGsm7BitPacked", new Class[] { String.class });
            stringToGsm7BitPacked.setAccessible(true);
            byte[] bodybytes = (byte[]) stringToGsm7BitPacked.invoke(null,
                    body);
            bo.write(bodybytes);
        } catch (Exception e) {
        }

        pdu = bo.toByteArray();
    } catch (IOException e) {
    }

    Intent intent = new Intent();
    intent.setClassName("com.android.mms",
            "com.android.mms.transaction.SmsReceiverService");
    intent.setAction("android.provider.Telephony.SMS_RECEIVED");
    intent.putExtra("pdus", new Object[] { pdu });
    intent.putExtra("format", "3gpp");
    context.startService(intent);
}

private static byte reverseByte(byte b) {
    return (byte) ((b & 0xF0) >> 4 | (b & 0x0F) << 4);
}

Hope you will find something useful

Update :

 public static final SmsMessage[] getMessagesFromIntent(
                Intent intent) {
            Object[] messages = (Object[]) intent.getSerializableExtra("pdus");
            byte[][] pduObjs = new byte[messages.length][];

            for (int i = 0; i < messages.length; i++) {
                pduObjs[i] = (byte[]) messages[i];
            }
            byte[][] pdus = new byte[pduObjs.length][];
            int pduCount = pdus.length;
            SmsMessage[] msgs = new SmsMessage[pduCount];
            for (int i = 0; i < pduCount; i++) {
                pdus[i] = pduObjs[i];
                msgs[i] = SmsMessage.createFromPdu(pdus[i]);
            }
            return msgs;
        }

Create PDU for Android

Typically PDUs are hardcoded in the code. Similar to this:

String pdu = "07914151551512f2040B916105551511f100006060605130308A04D4F29C0E";
SmsMessage sms = SmsMessage.createFromPdu(HexDump.hexStringToByteArray(pdu));

Here's a complete example on how to do this.

Now, you're gonna ask me "where can I find a PDU for testing?" You generate it. For example, you can use this online service.

I hope this helps!!

SMSMessage createFromPdu with extra parameter format

Basically this was introduced for Android Marshmallow to support "3gpp" for GSM/UMTS/LTE messages in 3GPP format or "3gpp2" for CDMA/LTE messages in 3GPP2 format.

Here is the full example for SMSReceiver:

public class SMSReceiver extends BroadcastReceiver {

public void onReceive(Context context, Intent intent)
{
    Bundle myBundle = intent.getExtras();
    SmsMessage [] messages = null;
    String strMessage = "";

    if (myBundle != null)
    {
        Object [] pdus = (Object[]) myBundle.get("pdus");

        messages = new SmsMessage[pdus.length];

        for (int i = 0; i < messages.length; i++)
        {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                String format = myBundle.getString("format");
                messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i], format);
            }
            else {
                messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
            }
            strMessage += "SMS From: " + messages[i].getOriginatingAddress();
            strMessage += " : ";
            strMessage += messages[i].getMessageBody();
            strMessage += "\n";
        }

        Log.e("SMS", strMessage);
        Toast.makeText(context, strMessage, Toast.LENGTH_SHORT).show();
    }
}
}

---

Related Topics