3.乐学成语----------显示主界面

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1.主界面的设计采取选项卡组件

在res的drawable-hdpi目录下拷贝需要的图片素材，在res/layout目录中新建activity_main.xml布局，代码如下：

<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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:theme="@android:style/Theme.NoTitleBar"    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>

2.在res的values目录的strings.xml文件中定义所需字符串，代码如下：

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">HappyIdiom</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string name="title_activity_main">MainActivity</string>    <string name="title_study">学习</string>    <string name="title_search">搜搜</string>    <string name="title_game">游戏</string>    <string name="title_save">收藏</string>    <string name="title_help">帮助</string>        <string-array name="category">        <item>动物类</item>        <item>自然类</item>        <item>人物类</item>        <item>季节类</item>        <item>数字类</item>        <item>寓言类</item>        <item>其他类</item>    </string-array>    <string name="title_activity_study">StudyActivity</string></resources>

3.在activity包下新建MainActivity继承自Activity,代码如下：

public class MainActivity extends TabActivity {    private TabHost tabHost;@Overrideprotected 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.search,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.search,StudyActivity.class);}private void addTab(String tag, int title_introduction, int title_icon,  Class ActivityClass){// TODO Auto-generated method stubtabHost.addTab(tabHost.newTabSpec(tag).setIndicator(getString(title_introduction),     getResources().getDrawable(title_icon)).setContent(new Intent(this,ActivityClass)));}@Overridepublic 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;}}

结果图为：

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