How to respond to text automatically?

Okay so here is my source code.. Something keeps going wrong and getting an Force close error. Here is the code, can someone tell me if i need to make any changes..

I have 2 classes one that sends the message and开发者_C百科 one that recieves... Here we go..

My first classes that has a method to send a text..

import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.widget.Toast;

public class InfoSender extends Activity {
private smsListener smsReceiver;
public String phoneNumber;
public String message; 

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_menu);
}

    public void send(String phoneNumber, String message){

        phoneNumber = smsListener.phnNumber;

          PendingIntent pi = PendingIntent.getActivity(this, 0,
                    new Intent(this, InfoSender.class), 0);                
                SmsManager sms = SmsManager.getDefault();
                sms.sendTextMessage(phoneNumber, null, message, pi, null);

            Toast.makeText(getApplicationContext(), "Details about house "+housenumber+"sent", 6);



            //Do nothing
        }

    }

Second Class that receives and responds automatically if a text says a certain thing..

@Override
public void onReceive(Context context, Intent intent) {
    Bundle bundle = intent.getExtras();
    SmsMessage[] msgs = null;
    String msg = "";

    if(bundle != null){

    }
    Object[]pdus = (Object[])bundle.get("pdus");
    msgs =new SmsMessage[pdus.length];

    for(int i=0; i<msgs.length; i++){
        msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
        msg += "Sms from "+msgs[i].getDisplayOriginatingAddress();

        phnNumber = msgs[i].getOriginatingAddress();
        msgBody = msgs[i].getMessageBody().toString(); 
    }

        if(msgBody.equalsIgnoreCase("0")){
            String phoneNumber = phnNumber;
            String message = sender.message;

        sender.send(phoneNumber, message);
    }
    }

}

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Without any logs it's difficult to say, but most likely you have a permission. You need to have permissions set in your manifest to Send, Receive, and Read, and Write.