乐学成语2

9.TabHost控件的应用，美化activity_main.xml的主界面效果

10在res的values目录的string.xml文件下定义所需字符串

<pre class="html" name="code"><?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_search">搜搜</string>    <string name="title_study">学习</string>    <string name="title_game">游戏</string>    <string name="title_save">收藏</string>    <string name="title_help">帮助</string>    <string name="animal">动物类</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>    <string name="title_activity_study_animal">StudyAnimalActivity</string></resources>

11.编写活动MainActivity

</pre><pre class="java" name="code"><pre class="java" name="code"><pre class="java" name="code">package cn.edu.bztc.happyidiom;import android.os.Bundle;import android.app.Activity;import android.app.TabActivity;import android.content.Intent;import android.view.Menu;import android.view.Window;import android.widget.TabHost;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.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);}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;}}

12.对配置文件进行修改

<pre class="html" name="code"> <activity            android:name="cn.edu.bztc.happyidiom.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>

<span style="font-size:24px;">13.作为ListView适配器的适配类型，在entity包下新建Category</span>

public class Category {private String name;private int imageId;public Category(String name,int imageId){super();this.name=name;this.imageId=imageId;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getImageId() {return imageId;}public void setImageId(int imageId) {this.imageId = imageId;}}

<span style="font-size:24px;">14.在layout下新建activity——study.xml文件，添加一个ListView控件，并在目录下新建category_item.xml   LinearLayout布局下添加ImageView（修改id为category_image）和TextView(修改id为category_name)控件</span>

<span style="font-size:24px;">15.创建适配器</span>

<pre class="html" name="code">public class CategoryAdapter extends ArrayAdapter<Category>{  private int resourceId;public CategoryAdapter(Context context, int resource, List<Category> objects) {super(context, resource, objects);// TODO Auto-generated constructor stubresourceId = resource;}public View getView(int position,View convertView,ViewGroup parent ){Category category=getItem(position);View view;ViewHolder viewHolder;if(convertView==null){ view=LayoutInflater.from(getContext()).inflate(resourceId,null); viewHolder=new ViewHolder(); viewHolder.categoryName=(TextView)view.findViewById(R.id.category_name); viewHolder.categoryImage=(ImageView) view.findViewById(R.id.category_image); view.setTag(viewHolder);}else {view=convertView;viewHolder=(ViewHolder)view.getTag();}viewHolder.categoryImage.setImageResource(category.getImageId());viewHolder.categoryName.setText(category.getName());return view;}class ViewHolder{ImageView categoryImage;TextView categoryName;}}

16.activity包下新建StudyActivity

<pre class="html" name="code">public class StudyActivity extends Activity {private  List<Category>categoryList;private String[]category_names;private int[]category_images;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_study);initCategories();CategoryAdapter adapter=new CategoryAdapter

(this,R.layout.category_item,categoryList);ListView listView=(ListView) findViewById(R.id.lvCategories);listView.setAdapter(adapter);listView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view, int position,long id) {// TODO Auto-generated method stubCategory category=categoryList.get(position);Toast.makeText(StudyActivity.this, category.getName(), Toast.LENGTH_LONG).show();}});}private void initCategories() {// TODO Auto-generated method stub}}