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// SMS RECEIVER
final String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
BroadcastReceiver SMSbr = new BroadcastReceiver() {
 
        @Override
        public void onReceive(Context context, Intent intent) {
                // Called every time a new sms is received
                Bundle bundle = intent.getExtras();
                if (bundle != null) {
                        // This will put every new message into a array of
                        // SmsMessages. The message is received as a pdu,
                        // and needs to be converted to a SmsMessage, if you want to
                        // get information about the message.
                        Object[] pdus = (Object[]) bundle.get("pdus");
                        final SmsMessage[] messages = new SmsMessage[pdus.length];
                        for (int i = 0; i < pdus.length; i++)
                                messages[i] = SmsMessage
                                                .createFromPdu((byte[]) pdus[i]);
                        if (messages.length > -1) {
                                // Shows a Toast with the phone number of the sender,
                                // and the message.
                                String smsToast = "New SMS received from "
                                                + messages[0].getOriginatingAddress() + "\n'"
                                                + messages[0].getMessageBody() + "'";
                                Toast.makeText(context, smsToast, Toast.LENGTH_LONG)
                                                .show();
                        }
                }
        }
};
// The BroadcastReceiver needs to be registered before use.
IntentFilter SMSfilter = new IntentFilter(SMS_RECEIVED);
this.registerReceiver(SMSbr, SMSfilter);

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private boolean checkSMS() {
        // Sets the sms inbox's URI
        Uri uriSMS = Uri.parse("content://sms");
        Cursor c = getBaseContext().getContentResolver().query(uriSMS, null,
                        "read = 0", null, null);
        // Checks the number of unread messages in the inbox
        if (c.getCount() == 0) {
                return false;
        } else
                return true;
}