send sms in android 2.2

SendSMS.java

public class SendSMS extends Activity {

    private void setStatus(String text)
    {
    	TextView status = (TextView)findViewById(R.id.status);
    	status.setText(text);
    }
    
    private void sendSMS(String phoneNumber, String message)
    {        
        String SENT = "SMS_SENT";
        String DELIVERED = "SMS_DELIVERED";

        PendingIntent sentPI = PendingIntent.getBroadcast(this, 0,
            new Intent(SENT), 0);

        PendingIntent deliveredPI = PendingIntent.getBroadcast(this, 0,
            new Intent(DELIVERED), 0);

        //---when the SMS has been sent---
        BroadcastReceiver br = new BroadcastReceiver(){
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode())
                {
                    case Activity.RESULT_OK:
                        setStatus("短信已发送");
                        break;
                    case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                    	setStatus("发送失败");
                        break;
                    case SmsManager.RESULT_ERROR_NO_SERVICE:
                    	setStatus("不在服务区");
                        break;
                    case SmsManager.RESULT_ERROR_NULL_PDU:
                    	setStatus("Null PDU");
                        break;
                    case SmsManager.RESULT_ERROR_RADIO_OFF:
                    	setStatus("Radio off");
                        break;
                }
                unregisterReceiver(this);
            }
        };
        
        registerReceiver(br,new IntentFilter(SENT));

        //---when the SMS has been delivered---
        BroadcastReceiver br2 = new BroadcastReceiver(){
            @Override
            public void onReceive(Context arg0, Intent arg1) {
                switch (getResultCode())
                {
                    case Activity.RESULT_OK:
                        setStatus("对方已收到短信");
                        break;
                    case Activity.RESULT_CANCELED:
                    	setStatus("SMS not delivered");
                }
                unregisterReceiver(this);
            }
        };
        registerReceiver(br2,new IntentFilter(DELIVERED));

        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);        
    }
}