为什么observer在service中不能启动,请大侠们帮忙看看

打算开机就自动启动一个onReceive  和一个observer来监听短信情况，onReceive  这个广播就有效。。，但observer就是不起效果。。非要手工启到一下带注册信息的activity才行，有人能帮帮我看看吗开机自启动service
package com.sendcut1;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;public class BootBroadcastReceiver extends BroadcastReceiver {static final String ACTION = "android.intent.action.BOOT_COMPLETED";@Overridepublic void onReceive(Context context, Intent intent) {
Intent serviceintent=new Intent();
serviceintent.setAction("com.sendcut1.MyService");
context.startService(serviceintent);
}}
----------------------------------------------------------------
服务中的内容
public class MyService extends Service {
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
Toast.makeText(this, "Service created…", Toast.LENGTH_LONG).show();
Log.v("abc", "Service onCreate");  
getContentResolver().registerContentObserver( Uri.parse("content://sms"),true, new SmsObserver(this, new Handler()));  //估计就是这个在service中无法注册成功，
}@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service destroyed…", Toast.LENGTH_LONG).show();
}}
-------------------------------------------------------
observerpackage com.sendcut1;import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.Timer;
import java.util.TimerTask;
import android.content.ContentResolver;
import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.NetworkInfo.State;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;public class SmsObserver extends ContentObserver {        
private Context context;
private static final String Log_TAG = null;
private static final String[] SMS_PROJECTION = new String[] {"address","body","date",};public SmsObserver(Context context,Handler handler) {
super(handler);                
this.context = context;
@Override
public void onChange (boolean selfChange) {
super.onChange(selfChange);
Cursor cur =  this.context.getContentResolver().query(Uri.parse("content://sms/sent"), null, null, null, null);       
cur.moveToFirst() ;  
...
....
...
}
-----------------------------------------------------------------------------------------AndroidManifest.xml<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.sendcut1"
      android:versionCode="1"
      android:versionName="1.0">
       <uses-sdk android:minSdkVersion="7" />    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Sendcut1Activity"
                  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=".BootBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver> <receiver android:name=".ReceiverDemo" android:enabled="true" >
<intent-filter>
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>
</receiver>  
<service android:name=".service.Myservice">
<intent-filter>
</intent-filter>
</service>
 
<activity android:name="Sendcut1Activity" android:label="@string/app_name" android:configChanges="orientation|keyboardHidden|navigation" android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
 </application><uses-permission android:name="android.permission.SEND_SMS"></uses-permission>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>
<uses-permission android:name="android.permission.READ_SMS"></uses-permission>
<uses-permission android:name="android.permission.WRITE_SMS"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
  
</manifest>