無法實例化錯誤？

這是我的源代碼。無法實例化錯誤？

public class MainActivity extends Activity { 
    private static String content; 
    private static String phone; 
    private String number; 
    private String message; 

    private BroadcastReceiver receiver = new BroadcastReceiver(){ 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     //---get the SMS message passed in--- 
     Bundle bundle = intent.getExtras();   
     SmsMessage[] msgs = null; 

     if (bundle != null) 
     { 
      number = ""; 
      message = ""; 
      //---retrieve the SMS message received--- 
      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]);     
       number = msgs[i].getOriginatingAddress();      

       message = msgs[i].getMessageBody(); 


      } 
      //---display the new SMS message--- 
      Toast.makeText(context, message, Toast.LENGTH_SHORT).show(); 
      SendMe(); 
    } 
    } 


}; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    IntentFilter filter = new IntentFilter(); 
    registerReceiver(receiver, filter); 
    setContentView(R.layout.main); 



    } 


      public void SendMe(){ 


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

} 
}

我不斷收到此錯誤的logcat的

06-28 17：11：23.241：ERROR/AndroidRuntime（1311）：了java.lang.RuntimeException：無法實例化接收機 COM .ftt.autospond.MainActivity：java.lang.ClassCastException： com.ftt.autospond.MainActivity

這裏是我的清單

<?xml version="1.0" encoding="utf-8"?>

<application android:icon="@drawable/icon" android:label="@string/app_name"> 
    <activity android:name=".MainActivity" 
       android:label="@string/app_name"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
      <receiver android:name="com.ftt.autospond.MainActivity"> 
     <intent-filter> 
      <action android:name= 
       "android.provider.Telephony.SMS_RECEIVED" />

來源

2011-06-28 theITRanger22