/**
 * 主Activity
 * 通過點擊RadioGroup下的RadioButton來切換不同界面
 * Created by D&LL on 2016/7/20.
 */
public class MainActivity extends TabActivity {
 //定義TabHost對象
 private TabHost tabHost;
 //定義RadioGroup對象
 private RadioGroup radioGroup;
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.tab_layout);
  initView();
  initData();
 }
 /**
  * 初始化組件
  */
 private void initView() {
  //實例化TabHost，得到TabHost對象
  tabHost = getTabHost();

  //得到Activity的個數(shù)
  int count = Constant.ConValue.mTabClassArray.length;

  for (int i = 0; i < count; i++) {
   //為每一個Tab按鈕設置圖標、文字和內(nèi)容
   TabSpec tabSpec = tabHost.newTabSpec(Constant.ConValue.mTextviewArray[i])
     .setIndicator(Constant.ConValue.mTextviewArray[i]).setContent(getTabItemIntent(i));
   //將Tab按鈕添加進Tab選項卡中
   tabHost.addTab(tabSpec);
  }
  //實例化RadioGroup
  radioGroup = (RadioGroup) findViewById(R.id.main_radiogroup);
 }
 /**
  * 初始化組件
  */
 private void initData() {
  // 給radioGroup設置監(jiān)聽事件
  radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
   public void onCheckedChanged(RadioGroup group, int checkedId) {
    switch (checkedId) {
     case R.id.RadioButton0:
      tabHost.setCurrentTabByTag(Constant.ConValue.mTextviewArray[0]);
      break;
     case R.id.RadioButton1:
      tabHost.setCurrentTabByTag(Constant.ConValue.mTextviewArray[1]);
      break;
     case R.id.RadioButton2:
      tabHost.setCurrentTabByTag(Constant.ConValue.mTextviewArray[2]);
      break;
     case R.id.RadioButton3:
      tabHost.setCurrentTabByTag(Constant.ConValue.mTextviewArray[3]);
      break;
     case R.id.RadioButton4:
      tabHost.setCurrentTabByTag(Constant.ConValue.mTextviewArray[4]);
      break;
    }
   }
  });
  ((RadioButton) radioGroup.getChildAt(0)).toggle();
 }
 /**
  * 給Tab選項卡設置內(nèi)容（每個內(nèi)容都是一個Activity）
  */
 private Intent getTabItemIntent(int index) {
  Intent intent = new Intent(this, Constant.ConValue.mTabClassArray[index]);
  return intent;
 }
}

MainActivity布局文件tab_layout.xml. TabHost布局，添加一個TabWidget用于顯示activity，下面是一個RadioGroup顯示切換activity的按鈕菜單。

<?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:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical">
  <FrameLayout
   android:id="@android:id/tabcontent"
   android:layout_width="fill_parent"
   android:layout_height="0.0dip"
   android:layout_weight="1.0"/>
  <TabWidget
   android:id="@android:id/tabs"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:layout_weight="0.0"
   android:visibility="gone"/>
  <RadioGroup
   android:id="@+id/main_radiogroup"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:layout_gravity="bottom"
   android:background="@drawable/tab_widget_background"
   android:gravity="center_vertical"
   android:orientation="horizontal"
   android:padding="2dip">
   <RadioButton
    android:id="@+id/RadioButton0"
    style="@style/tab_item_background"
    android:drawableTop="@drawable/tab_home"
    android:text="主頁"
    android:textColor="#ffffff"/>
   <RadioButton
    android:id="@+id/RadioButton1"
    style="@style/tab_item_background"
    android:drawableTop="@drawable/tab_msg"
    android:text="評論"
    android:textColor="#ffffff"/>
   <RadioButton
    android:id="@+id/RadioButton2"
    style="@style/tab_item_background"
    android:drawableTop="@drawable/tab_write"
    android:text="發(fā)微博"
    android:textColor="#ffffff"/>
   <RadioButton
    android:id="@+id/RadioButton3"
    style="@style/tab_item_background"
    android:drawableTop="@drawable/tab_me"
    android:text="用戶信息"
    android:textColor="#ffffff"/>
   <RadioButton
    android:id="@+id/RadioButton4"
    style="@style/tab_item_background"
    android:drawableTop="@drawable/tab_more"
    android:text="更多"
    android:textColor="#ffffff"/>
  </RadioGroup>
 </LinearLayout>
</TabHost>

效果圖：