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;

@Override
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);

}
private void addTab(String tag, int title_introduction, int title_icon,
Class  ActivityClass) {
// TODO Auto-generated method stub
tabHost.addTab(tabHost.newTabSpec(tag).setIndicator(getString(title_introduction), getResources().getDrawable(title_icon)).setContent(new Intent(this,ActivityClass)));

}

@Override
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;
}

}

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 stub
resourceId = 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;
@Override
protected 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() {

@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position,
long id) {
// TODO Auto-generated method stub
Category category=categoryList.get(position);
Toast.makeText(StudyActivity.this, category.getName(), Toast.LENGTH_LONG).show();
}
});
}
private void initCategories() {
// TODO Auto-generated method stub

}
}