Service 使用Notification 找不到布局的view

com.multimediacall.R.layout.downloadnotification布局内的 R.id.tv_down   R.id.pb_schedule 在 handler  调用notificationManager.notify(R.drawable.download_downloading, notification);时找不到  View 
package com.multimediacall.download;import java.io.File;import com.multimediacall.R;
import com.multimediacall.download.stream.DownloadProgressListener;
import com.multimediacall.download.stream.FileDownload;
import com.multimediacall.util.SysParam;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.provider.MediaStore.Audio;
import android.util.Log;
import android.widget.RemoteViews;public class DownloadService extends android.app.Service{
private static final String TAG = "DownloadService";  
private FileDownload fileDownload;
private NotificationManager notificationManager;
private Notification notification;
private int count = 0; 
private StringBuffer sb;
private File dir; 
public void onCreate() {
notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
notification = new Notification(R.drawable.download_downloading,"收到共享文件",System.currentTimeMillis());
notification.contentView = new RemoteViews(getPackageName(),com.multimediacall.R.layout.downloadnotification);
//     notification.contentView.setProgressBar(R.id.pb_schedule, 100,0, false);
    
notification.contentView.setTextViewText(R.id.tv_down,"0 ");
     //设置进度条，最大值 为100,当前值为0，最后一个参数为true时显示条纹
     //（就是在Android Market下载软件，点击下载但还没获取到目标大小时的状态）
     Intent notificationIntent = new Intent(this,DownloadService.class); 
     PendingIntent contentIntent = PendingIntent.getActivity(this,0,notificationIntent,0); 
     notification.contentIntent = contentIntent;
     notification.setLatestEventInfo(this, "任务标题", "任务内容", contentIntent);
    
      
     notification.sound =  Uri.parse("android.resource://com.multimediacall/raw/message");     notificationManager.notify(R.drawable.download_downloading, notification);    
//
// System.out.println(" onCreate  ");
 }

 public void onStart(Intent intent, int startId)
 {
 super.onStart(intent, startId);
 System.out.println(" onStart  ");
 Bundle bundle = intent.getExtras();
     String phoneNumber = (String)bundle.getString("phoneNumber");
     System.out.println("phoneNumber"  +  phoneNumber);
     sb  = new StringBuffer(SysParam.server);
     sb.append(SysParam.downloadServlet);
     sb.append("1=" + phoneNumber);
     sb.append("&2=320" );
     sb.append("&3=480");
     sb.append("&4=0");
     sb.append("&5=0");
     if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
     {
dir = Environment.getExternalStorageDirectory();//文件保存目录
if(dir.exists())
{
 print(sb.toString());
  new Thread(new Runnable(){
public void run() {
fileDownload  = new FileDownload(DownloadService.this, sb.toString(), dir);
if(fileDownload.getMessageFlag().equals("OK!DM"))
{
int length = fileDownload.getFileSize();//获取文件的长度
try{
fileDownload.download(new DownloadProgressListener(){
public void onDownloadSize(int size) {//可以实时得到文件下载的长度
Message message = new Message();
Bundle bundle = new Bundle();
bundle.putInt("size", size);
message.setData(bundle);
handler.sendMessage(message);
}});
System.out.println("file download over ...........");
notificationManager.cancel(R.drawable.download_downloading); System.out.println("over  ...............");
}
catch(Exception e){
print(e.toString());
e.printStackTrace();
}
}
else if(fileDownload.getMessageFlag().equals("NO!DM"))
{
// Message msg = new Message();//信息提示
// msg.what = -1;
// msg.getData().putString("error", "无文件下载");//
// handler.sendMessage(msg);
return ;
}
else if(fileDownload.getMessageFlag().equals("ER!DM"))
{
// Message msg = new Message();//信息提示
// msg.what = -1;
// msg.getData().putString("error", "文件下载失败");//
// handler.sendMessage(msg);
return ;
}

System.out.println("over    ...................");
}
}).start();
}
 }
     else
     {
      this.onDestroy();
     }
 }
 
 private Handler handler = new Handler(){
public void handleMessage(Message msg) {
super.handleMessage(msg);

Bundle bundle = msg.getData();
int size  = bundle.getInt("size");
System.out.println("     1  ");

notification.contentView.setTextViewText(com.multimediacall.R.id.tv_down," "+ size);//      notification.contentView.setProgressBar(R.id.pb_schedule, fileDownload.getFileSize(),size, false);
     System.out.println("     2  ");
     notificationManager.notify(R.drawable.download_downloading, notification);
    
     System.out.println("     3  ");
}
};

 public void onDestroy() {
     super.onDestroy();    
     System.out.println(" onDestroy  ");
 }
 
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
     System.out.println(" onBind  ");
return null;
}  public boolean onUnbind(Intent intent) {   
      
  System.out.println(" onUnbind  ");
      return super.onUnbind(intent);   
}    //打印日志
private static void print(String msg){
Log.i(TAG, msg);
}}
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