<?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">         <TabWidget android:id="@android:id/tabs"             android:layout_alignParentBottom="true"             android:layout_width="fill_parent"             android:layout_height="wrap_content"/>         <FrameLayout             android:id="@android:id/tabcontent"             android:layout_width="fill_parent"             android:layout_height="fill_parent" />     </LinearLayout> </TabHost>

public class MainActivity extends TabActivity {     private TabHost my_tabhost;      private TabWidget my_tabwidget;     private int i,k;     private TextView tv;     private String[] tabMenu = { "系统", "硬件", "操作"};     private Intent intent0, intent1, intent2;     private Intent[] intents = { intent0, intent1, intent2};     private TabHost.TabSpec tabSpec0, tabSpec1, tabSpec2, tabSpec3;     private TabHost.TabSpec[] tabSpecs = { tabSpec0, tabSpec1, tabSpec2, tabSpec3};     public static Context mContext;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);        　　　　　　 　　// 不要窗体标题         　　　　　　　requestWindowFeature(Window.FEATURE_NO_TITLE);         　　　　　　 setContentView(R.layout.activity_main);         setContentView(R.layout.activity_main);         my_tabhost = getTabHost();         intent0 = new Intent(this, system.class);         intent1 = new Intent(this, hardware.class);         intent2 = new Intent(this, operation.class);         tabSpec0 = my_tabhost.newTabSpec("system").setIndicator(tabMenu[0],null).                 setContent(intent0);         tabSpec1 = my_tabhost.newTabSpec("hardware").setIndicator(tabMenu[1],null).                 setContent(intent1);         tabSpec2 = my_tabhost.newTabSpec("operation").setIndicator(tabMenu[2],null).                 setContent(intent2);         my_tabhost.addTab(tabSpec1);         my_tabhost.addTab(tabSpec0);         my_tabhost.addTab(tabSpec2); <br> 　　　　            // 设置默认选中的选项卡为第2个                            my_tabhost.setCurrentTab(1);     } }