底部TabHost

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（TabWidget ，FrameLayout 在TabHost内。TabWidget 和FrameLayout 平行的关系）

1.MainActivity

public class MainActivity extends TabActivity {private TabHost tabHost;protected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);//取消标题栏setContentView(R.layout.activity_main);tabHost=getTabHost();addTab("study",R.string.title_study,R.drawable.study,StudyActivity.class);addTab("search",R.string.title_search,R.drawable.search,StudyActivity.class);addTab("game",R.string.title_game,R.drawable.game,StudyActivity.class);addTab("save",R.string.title_save,R.drawable.save,StudyActivity.class);addTab("help",R.string.title_help,R.drawable.help,StudyActivity.class);}@SuppressWarnings("rawtypes")private void addTab(String tag,int title_introduction,int title_icon,Class ActivityClass){tabHost.addTab(tabHost.newTabSpec(tag).setIndicator(getString(title_introduction), getResources().getDrawable(title_icon)).setContent(new Intent(this,ActivityClass)));}public boolean onCreateOptionsMenu(Menu menu){//inflate the menu;this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

2.activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <TabHost        android:id="@android:id/tabhost"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true">        <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="vertical">            <TabWidget                android:id="@android:id/tabs"                android:layout_width="match_parent"                android:layout_height="wrap_content" >            </TabWidget>            <FrameLayout                 android:id="@android:id/tabcontent"                android:layout_width="match_parent"                android:layout_height="match_parent">                <LinearLayout                     android:id="@+id/tab1"                    android:orientation="vertical"                    android:layout_width="match_parent"                    android:layout_height="match_parent">                </LinearLayout>                <LinearLayout                     android:id="@+id/tab2"                    android:orientation="vertical"                    android:layout_width="match_parent"                    android:layout_height="match_parent">                </LinearLayout>                <LinearLayout                     android:id="@+id/tab3"                    android:orientation="vertical"                    android:layout_width="match_parent"                    android:layout_height="match_parent">                </LinearLayout>            </FrameLayout>        </LinearLayout>          </TabHost></RelativeLayout>

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