Android :: Sending SMS - Code Will Work Or Not

I am new in android, I need to send the sms in android, I have tried with the following code, and I have tested in emulator, but I am getting error. I need to know how to send sms, and also please tell me below code will work or not

import android.app.Activity; import android.app.AlertDialog;
import android.app.PendingIntent; import android.content.Intent;
import android.os.Bundle; import android.telephony.gsm.SmsManager;
import android.view.View; import android.view.View.OnClickListener;
import android.widget.Button; import android.widget.EditText;

public class email extends Activity { /** Called when the activity is first created.
*/ public EditText name_text;
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.email);
final EditText to_text = (EditText) findViewById(R.id.to_text); to_text.setOnClickListener(new OnClickListener() { public void onClick(View v) { to_text.setText(""); } } );
final EditText message_label = (EditText) findViewById(R.id.message_text); message_label.setOnClickListener(new OnClickListener() { public void onClick(View v) { message_label.setText(""); } } );
Button send_button = (Button) findViewById(R.id.send_button); send_button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
String tvstring = to_text.getText().toString();
String bodystring = message_label.getText().toString();
tvstring = tvstring.trim();
if (tvstring.equalsIgnoreCase("Enter The Email-ID")
|| tvstring.equalsIgnoreCase("")) {
AlertDialog.Builder builder = new AlertDialog.Builder(email.this);
builder.setMessage("Please Enter Your Email-ID or Mobile Number")
.setPositiveButton("OK", null).show();
} else if (bodystring.equalsIgnoreCase("Enter The Your Message")
|| bodystring.equalsIgnoreCase(""))
{ AlertDialog.Builder builder = new AlertDialog.Builder(email.this);
builder.setMessage("Please Enter Your Message").setPositiveButton(
"OK", null).show(); }else { sendSMS(tvstring, bodystring); } } } );
} private void sendSMS(String phoneNumber, String message) {
PendingIntent pi = PendingIntent.getActivity(this, 0,
new Intent(this, email.class), 0); SmsManager sms = SmsManager.getDefault(); sms.sendTextMessage(phoneNumber, null, message, pi, null); } }