TabHost是整个Tab的容器,包括两部分,TabWidget和FrameLayout。TabWidget就是每个tab的标签,FrameLayout则是tab内容。

1、如果我们使用extends TabAcitivty,如同ListActivity,TabHost必须设置为@android:id/tabhost 
2、TabWidget必须设置android:id为@android:id/tabs  3、FrameLayout需要设置android:id为@android:id/tabcontent  4、参考这儿:<a href=" http:="" www.2cto.com="" kf="" web="" asp="" "="" target="_blank" class="keylink" style="color: rgb(51, 51, 51); text-decoration: none;">aspx">

先自定义一个xml文件: 

Java代码  
 <?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">  
     <LinearLayout  
         android:orientation="vertical"  
         android:layout_width="fill_parent"  
         android:layout_height="fill_parent">  
     <FrameLayout  
         android:id="@android:id/tabcontent"  
         android:layout_width="fill_parent"  
         android:layout_height="fill_parent"  
          android:layout_weight="1.0"  
         android:paddingBottom="53px"/>  
     <TabWidget  
         android:id="@android:id/tabs"  
         android:layout_alignParentBottom="true"  
         android:layout_width="fill_parent"  
         android:layout_height="50px"   
         android:visibility="gone"  
         android:layout_weight="0.0"/>  
         <RadioGroup  
             android:gravity="center_vertical"  
             android:orientation="horizontal"  
             android:id="@+id/main_radio"  
             android:background="@drawable/radiogroup_background"  
             android:layout_width="fill_parent"  
             android:layout_height="50dip"  
             android:layout_gravity="bottom">  
             <RadioButton  
                 android:id="@+id/main_index_button"  
                 android:layout_marginTop="1.0dip"  
                 android:layout_marginRight="5dip"  
                 android:text="@string/main_name"  
                 android:drawableTop="@drawable/unistall"  
                 style="@style/main_tab_bottom"  
                 android:background="@drawable/radio_bg"/>  
             <RadioButton  
                 android:id="@+id/main_running_button"  
                 android:layout_marginTop="1.0dip"  
                 android:layout_marginRight="5dip"  
                 android:text="@string/run_manager_name"  
                 android:drawableTop="@drawable/unistall"  
                 style="@style/main_tab_bottom"  
                 android:background="@drawable/radio_bg"/>  
             <RadioButton  
                 android:id="@+id/main_uninstall_button"  
                 android:layout_marginTop="1.0dip"  
                 android:text="@string/uninstall_manager_name"  
                 android:drawableTop="@drawable/unistall"  
                 style="@style/main_tab_bottom"  
                 android:background="@drawable/radio_bg"/>  
         </RadioGroup>  
     </LinearLayout>  
 </TabHost>

为了让tabHost显示在下方,要将RadioGroup的layout_gravity设置为bottom,再将FrameLayout的layout_weight设置为1,这样就可以将RadioGroup撑到最下方。style="@style/main_tab_bottom"里面定义了样式文件。

接下来就是在activity中初始化并添加tabhost: 
Java代码  

tabHost = (TabHost) findViewById(android.R.id.tabhost);  
         tabHost.addTab(Constant.tabHost.newTabSpec("Main")  
                 .setIndicator(getString(R.string.main_name),null)  
                 .setContent(new Intent(this, Main.class)));  
         tabHost.addTab(Constant.tabHost.newTabSpec("RunManager")  
                 .setIndicator(getString(R.string.run_manager_name),null)  
                 .setContent(new Intent(this, RunManager.class)));  
         tabHost.addTab(Constant.tabHost.newTabSpec("UninstallManager")  
                 .setIndicator(getString(R.string.uninstall_manager_name),null)  
                 .setContent(new Intent(this, UninstallManager.class)));


初始化每个RadioButton并为其添加setOnCheck