自定义android的tab样式 《》

<? xml version ="1.0" encoding ="utf-8" ?>
< TabHost xmlns:android ="http://schemas.android.com/apk/res/android"
   android:id ="@android:id/tabhost" android:layout_width ="fill_parent"
   android:layout_height ="fill_parent" android:background ="@color/white" >
   < LinearLayout android:orientation ="vertical"
     android:layout_width ="fill_parent" android:layout_height ="fill_parent" >
     < TabWidget android:id ="@android:id/tabs"
       android:layout_width ="fill_parent" android:layout_height ="wrap_content"
       android:gravity ="center_horizontal|center_vertical" />
     < FrameLayout android:id ="@android:id/tabcontent"
       android:layout_width ="fill_parent" android:layout_height ="fill_parent" >
     </ FrameLayout >
   </ LinearLayout >
</ TabHost >

@Override
public void onCreate(Bundle savedInstanceState) {
   super .onCreate(savedInstanceState);
  setContentView(R.layout.main);
  mTabHost = getTabHost();
       
  Intent intent1 = new Intent(this,OfficialActivity.class);
  createTab("公共聊天室",intent1);
       
  Intent intent2 = new Intent(this, NearByActivity.class);
  createTab("周边",intent2);
       
  Intent intent3= new Intent(this, HistoryActivity.class);
  createTab("历史",intent3);
       
  mTabHost.setCurrentTab(1);
}

 private void createTab(String text ,Intent intent){          mTabHost.addTab(mTabHost.newTabSpec(text).setIndicator(createTabView(text)).setContent(intent));
    }

    private View createTabView(String text) {
            View view = LayoutInflater.from(this).inflate(R.layout.tab_indicator, null);
            TextView tv = (TextView) view.findViewById(R.id.tv_tab);
            tv.setText(text);
            return view;
    }

<? xml version ="1.0" encoding ="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
   android:layout_height ="fill_parent" android:layout_width ="fill_parent"
   android:orientation ="vertical" android:gravity ="center"
   android:theme ="@android:style/Theme.NoTitleBar" android:background ="@drawable/chat_tab_selector" >
   < TextView android:id ="@+id/tv_tab" android:layout_width ="wrap_content" android:layout_height ="wrap_content"
   android:text ="tab1" android:textColor ="@color/white" />
</ LinearLayout >

<? xml version ="1.0" encoding ="utf-8" ?>
         < selector xmlns:android = "http://schemas.android.com/apk/res/android" >     
         < item     
        android:state_focused = "true"    
        android:drawable = "@drawable/topbar_bg_down"    
         />
         < item     
        android:state_selected = "true"    
        android:drawable = "@drawable/topbar_bg_down"    
         />
         < item     
        android:state_pressed = "true"    
        android:drawable = "@drawable/topbar_bg_down"    
         />     
         < item android:drawable = "@drawable/topbar_background" />     
         </ selector >