NOTE: attach of thread 'Binder Thread #3' 错误

本人写了个ListView的测试程序，但最终结果显示不出来，用logcat提示：
      04-04 07:14:26.308: INFO/AndroidRuntime(337): NOTE: attach of thread 'Binder Thread #3' failed
      04-04 07:14:28.218: INFO/ActivityManager(60): Starting activity: Intent {  act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=gao.ListView/.ListViewTest }
      04-04 07:14:28.278: INFO/AndroidRuntime(345): NOTE: attach of thread 'Binder Thread #3' failed
 我写的代码如下：
    ListViewTest.java代码：
  （1）package gao.ListView;import java.util.ArrayList;
import java.util.HashMap;import android.app.Activity;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.SimpleAdapter;public class ListViewTest extends ListActivity {
    
    public void onCreate(Bundle savedInstanceState, String gao) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ArrayList< HashMap<String,String>> list = new  ArrayList< HashMap<String,String>>();
        HashMap<String,String> map1 = new HashMap<String, String>();
        HashMap<String,String> map2 = new HashMap<String,String>();
        HashMap<String,String> map3 = new HashMap<String,String>();
        map1.put("user_name", "gao");
        map1.put("user_ip","192.168.0.1");
        map2.put("user_name", "yang");
        map2.put("user_ip", "192.168.0.2");
        map3.put("user_name","li");
        map3.put("uaer-ip","192.168.0.3");
        list.add(map1);
        list.add(map2);
        list.add(map3);
        SimpleAdapter listAdapter=new SimpleAdapter(this, list, R.layout.user,
                                                      new String[]{"user_name","user_ip"}, 
                                                      new int[]{R.id.user_name,R.id.user_ip});
        setListAdapter(listAdapter);
    }}（2）main.xml代码：
   <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
      <ListView
        android:id="@+id/android:list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scrollbars="vertical"
      ></ListView>
</LinearLayout>（3）user.xml的代码：
   <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
        <TextView
           android:id="@+id/user_name"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:textSize="10pt"
           android:singleLine="true"
        ></TextView>
        
        <TextView
           android:id="@+id/user_ip"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:textSize="10pt"
           android:gravity="right"
        ></TextView>
  
</LinearLayout>小弟初学android，，请各位大侠帮忙，，，