乐学成语

    首先分析HappyIdiom中应该具备哪些功能。

1. 成语分类学习：用户可以根据自己喜欢的分类（动物类、人物类、季节类、自然类、数学类、预言类、其他类）来进行选择学习。

2. 乐猜成语：学习之余玩玩猜成语的游戏，寓教于乐。

3. 成语收藏：当用户遇到自己想要保存的成语时，点击保存按钮，即保存到收藏页面以方便用户再次查看，对已经掌握的成语，用户可以从收藏夹中删除。

4. 成语查询： 支持首字母查询，如一心一意，可以输入：yxyy。

  一、创建数据库和表

  首先在com.edu.bztc.happyidiom包下在创建几个包

其中activity包用于存放所有活动相关的代码，db包用于存放所有数据库相关的代码，entity包用于存放实体类的相关代码，dao包用于存放数据操作相关的代码，util包用于存放所有相关工具的代码。

首先使用Navicat Premium可视化界面来创建数据库，选择文件菜单->新建->SQList,在弹出的对话框中输入连接名，选择类型喂SQList3。

在res目录下新建raw目录，将idioms.db数据库复制到raw目录下。

在db包下新建一个DBOpenHelper类，代码如下：

public class DBOpenHelper {private final int BUFFER_SIZE = 400000;//缓冲区大小public static final String DB_NAME = "idioms.db";//保存的数据库名称public static final String PACKAGE_NAME = "cn.edu.bztc.happyidiom";//应用的包名public static final String DB_PATH = "/data" + Environment.getDataDirectory().getAbsolutePath()+ "/" + PACKAGE_NAME + "/databases"; //在手机里存放数据库的位置private Context context;public DBOpenHelper(Context context){this.context = context;}public SQLiteDatabase openDatabase(){try {File myDataPath = new File(DB_PATH);if(!myDataPath.exists()){myDataPath.mkdirs();//如果没有这个目录则创建}String dbfile = myDataPath+"/"+DB_NAME;if(!(new File(dbfile).exists())){//判断数据库文件是否存在，若不存在则执行导入，否则直接打开数据库InputStream is = context.getResources().openRawResource(R.raw.idioms);FileOutputStream fos = new FileOutputStream(dbfile);byte[] buffer = new byte[BUFFER_SIZE];int count = 0;while((count=is.read(buffer))>0){fos.write(buffer,0,count);}fos.close();is.close();}SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(dbfile, null);return db;} catch (FileNotFoundException e) {Log.e("Database", "File not found");e.printStackTrace();} catch (IOException e) {Log.e("Database", "IO exception");e.printStackTrace();}return null;}}

上面代码实现的功能主要是使用输入输出流将idioms.db复制到手机中默认存放数据库的位置。

验证是否复制成功，修改AndroidManifest.xml文件搭建单元测试环境，修改后的文件如下：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.edu.bztc.happyidiom"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="14"        android:targetSdkVersion="18" />    <application        android:allowBackup="true"        android:icon="@drawable/logo"        android:label="@string/app_name"        android:theme="@style/AppTheme" >     <strong> <span style="background-color: rgb(255, 255, 255);">  <uses-library android:name="android.test.runner"/></span></strong>        <activity            android:name="cn.edu.bztc.happyidiom.activity.MainActivity"            android:label="@string/title_activity_main" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity            android:name="cn.edu.bztc.happyidiom.activity.StudyActivity"            android:label="@string/title_activity_main" >        </activity>        <activity            android:name="cn.edu.bztc.happyidiom.activity.StudyAnimalActivity"            android:label="@string/title_activity_main" >        </activity>           </application><strong><instrumentation     android:name="android.test.InstrumentationTestRunner"    android:targetPackage="cn.edu.bztc.happyidiom">    </instrumentation></strong></manifest>

接下来在test包下新建DBOpenHelperTest继承AndroidTestCase，代码如下

public class DBOpenHelperTest extends AndroidTestCase{public void testDBCopy(){DBOpenHelper dbOpenHelper = new DBOpenHelper(getContext());dbOpenHelper.openDatabase();}}

另外，Animal表还存在一个对应的实体类，因此，在entity包下新建一个Animal类，代码如下：

public class Animal{private int id;private String name;//成语名称private String pronounce;//成语发音private String explain;//成语解释private String antonym;//反义词private String homoionym;//同义词private String derivation;//源自private String exampless;//例子public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPronounce() {return pronounce;}public void setPronounce(String pronounce) {this.pronounce = pronounce;}public String getExplain() {return explain;}public void setExplain(String explain) {this.explain = explain;}public String getAntonym() {return antonym;}public void setAntonym(String antonym) {this.antonym = antonym;}public String getHomoionym() {return homoionym;}public void setHomoionym(String homoionym) {this.homoionym = homoionym;}public String getDerivation() {return derivation;}public void setDerivation(String derivation) {this.derivation = derivation;}public String getExampless() {return exampless;}public void setExampless(String exampless) {this.exampless = exampless;}public int getId() {return id;}public void setId(int id) {this.id = id;}}

接着创建一个AnimalDao类， 这个类将会把一些常用的数据库操作封装起来，以方便后面使用，代码如下：

public class AnimalDao {private static AnimalDao animalDao;private SQLiteDatabase db;//将构造方法私有化private AnimalDao(Context context){DBOpenHelper dbHelper = new DBOpenHelper(context);db = dbHelper.openDatabase();}//获取AnimalDao的实例public synchronized static AnimalDao getInstance(Context context){if(animalDao == null){animalDao=new AnimalDao(context);}return animalDao;}//从数据库读取所有的动物类成语public List<Animal> getAllAnimals(){List<Animal> list = new ArrayList<Animal>();Cursor cursor= db.query("animal", null, null, null, null, null, null);if(cursor.moveToFirst()){do{Animal animal = new Animal();animal.setId(cursor.getInt(cursor.getColumnIndex("_id")));animal.setName(cursor.getString(cursor.getColumnIndex("name")));animal.setPronounce(cursor.getString(cursor.getColumnIndex("pronounce")));animal.setAntonym(cursor.getString(cursor.getColumnIndex("antonym")));animal.setHomoionym(cursor.getString(cursor.getColumnIndex("homoionym")));animal.setDerivation(cursor.getString(cursor.getColumnIndex("derivation")));animal.setExampless(cursor.getString(cursor.getColumnIndex("examples")));list.add(animal);}while(cursor.moveToNext());}return list;}}

编写单元测试类AnimalDaoTest继承AndroidTestCase，代码如下：

public class AnimalDaoTest extends AndroidTestCase{public void testGetAllAnimals(){AnimalDao animalDao = AnimalDao.getInstance(getContext());List<Animal> animals = animalDao.getAllAnimals();System.out.println(animals.size());for(Animal animal:animals){System.out.println(animal.getName());}}}

运行测试单元。

二、显示主界面

在res的drawable-hdpi目录下拷入需要的图片素材，在res/layout目录中新建activity_main.xml布局，

布局文件内容比较简单，主要是拖一个TabHost控件到页面，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"    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" >            <FrameLayout                android:id="@android:id/tabcontent"                android:layout_width="match_parent"                android:layout_height="match_parent"                android:layout_weight="1" >                <LinearLayout                    android:id="@+id/tab1"                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:orientation="vertical" >                </LinearLayout>                <LinearLayout                    android:id="@+id/tab2"                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:orientation="vertical" >                </LinearLayout>                <LinearLayout                    android:id="@+id/tab3"                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:orientation="vertical" >                </LinearLayout>            </FrameLayout>            <TabWidget                android:id="@android:id/tabs"                android:layout_width="match_parent"                android:layout_height="wrap_content" >            </TabWidget>        </LinearLayout>    </TabHost></RelativeLayout>

如图所示：

然后在res的values目录的strings.xml文件中定义所需的字符串，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">乐学成语</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></resources>

接下来，需要编写活动，在activity包下新建MainActivity继承自Activity，代码如下：

@SuppressWarnings("deprecation")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){tabHost.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 preaent.getMenuInflater().inflate(R.menu.main, menu);return true;}}

在此，取消标题栏的方法，一定要位于setContentView（）方法之前。

在运行之前，修改AndroidManifest.xml文件，修改如下：

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

主要是注册了MainActivity，通过加入<intent-filter> 将其设置为首先启动的类，运行程序。

运行结果指示器上只显示出了文字，但是图片未显示出来，可以通过修改主题来实现，如设置activity的theme为

            android:theme="@android:style/Theme.NoTitleBar"

结果如图所示：

如果想让指示器显示在底部，只需要对activity_main.xml文件稍加修改，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"    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" >            <FrameLayout                android:id="@android:id/tabcontent"                android:layout_width="match_parent"                android:layout_height="match_parent"              <span style="background-color: rgb(255, 204, 204);"> <strong> android:layout_weight="1"</strong></span> >                <LinearLayout                    android:id="@+id/tab1"                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:orientation="vertical" >                </LinearLayout>                <LinearLayout                    android:id="@+id/tab2"                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:orientation="vertical" >                </LinearLayout>                <LinearLayout                    android:id="@+id/tab3"                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:orientation="vertical" >                </LinearLayout>            </FrameLayout>          <strong style="background-color: rgb(255, 204, 204);">  <TabWidget                android:id="@android:id/tabs"                android:layout_width="match_parent"                android:layout_height="wrap_content" >            </TabWidget></strong>        </LinearLayout>    </TabHost></RelativeLayout>

结果如图所示：

三、显示学习列表

用ListView的界面进行定制以列表的形式显示出成语分类列表，修改values中的strings.xml文件如下：

 <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>

接着定义一个实体类，作为ListView适配器的适配类型，在entity包下新建Category类，代码如下：

public class Category {private String name;//类别名称private int imageId;//类别对应的图片public Category(String name,int imageId){super();this.name=name;this.imageId=imageId;}public String getName() {return name;}public int getImageId() {return imageId;}}

在layout下新建activity_study.xml文件，主要添加一个ListView控件，代码如下：

<?xml version="1.0" encoding="utf-8"?><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:background="@drawable/bg_ling"    tools:context=".StudyActivity" >    <ListView         android:id="@+id/IvCategories"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layoutAnimation="@anim/anim_layout_listview"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true" >            </ListView>    </RelativeLayout>

然后需要为ListView的子项指定一个自定义的布局，在layout目录下新建category_item.xml。代码如下：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal"    android:padding="10dp" >    <ImageView        android:id="@+id/category_image"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/category_animal" />    <TextView        android:id="@+id/category_name"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:text="@array/category"        android:textAppearance="?android:attr/textAppearanceLarge" /></LinearLayout>

接下来，需要下应用包线创建adapter包，新建适配器CategoryAdapter类继承自ArrayAdapter，并将泛型定义为Category类，代码如下：

public class CategoryAdapter extends ArrayAdapter<Category> {private int resourceId;public CategoryAdapter(Context context, int resource, List<Category> objects) {super(context, resource, objects);resourceId = resource;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Category category = getItem(position);// 获取当前项的Category实例// View view=LayoutInflater.from(getContext()).inflate(resourceId,// null);View view;ViewHolder viewHolder;if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(resourceId, null);viewHolder = new ViewHolder();viewHolder.categoryImage = (ImageView) view.findViewById(R.id.category_image);viewHolder.categoryName = (TextView) view.findViewById(R.id.category_name);view.setTag(viewHolder);//将ViewHolder存储在View中} else {view = convertView;viewHolder = (ViewHolder) view.getTag();//重新获取ViewHolder}//ImageView caImageImage = (ImageView) view//.findViewById(R.id.category_image);//TextView categoryName = (TextView) view//.findViewById(R.id.category_name);//categoryImage.setImageResource(category.getImageId());//categoryName.setText(category.getName());viewHolder.categoryImage.setImageResource(category.getImageId());viewHolder.categoryName.setText(category.getName());return view;}class ViewHolder {ImageView categoryImage;TextView categoryName;}}

下面在activity包下新建StudyActivity继承自Activity，代码如下：

public class StudyActivity extends Activity {private List<Category> categoryList;private String[] category_names;private int[] category_images;@Overrideprotected void onCreate(Bundle saveInstanceState) {super.onCreate(saveInstanceState);setContentView(R.layout.activity_study);initCategories();// 初始化类别CategoryAdapter adapter = new CategoryAdapter(this,R.layout.category_item, categoryList);ListView listView = (ListView) findViewById(R.id.IvCategories);listView.setAdapter(adapter);listView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view,int position, long id) {// Category category=categoryList.get(position);// Toast.makeText(StudyActivity.this, category.getName(),// Toast.LENGTH_LONG).show();switch (position) {case 0:Intent intent = new Intent(StudyActivity.this,StudyAnimalActivity.class);startActivity(intent);break;default:break;}}});}private void initCategories() {categoryList = new ArrayList<Category>();Resources resources = getResources();category_names = resources.getStringArray(R.array.category);category_images = new int[] { R.drawable.category_animal,R.drawable.category_nature, R.drawable.category_human,R.drawable.category_season, R.drawable.category_number,R.drawable.category_fable, R.drawable.category_other };for (int i = 0; i < category_names.length; i++) {categoryList.add(new Category(category_names[i], category_images[i]));}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.study, menu);return true;}}

           在运行之前，首先修改AndroidManifest.xml文件将StudyActivity变为入口类，现在重新运行程序。

虽然目前我们定制的页面比较简单，但是只要修改Category_item.xml文件中的内容，就可以使界面复杂化。

                修改CategoryAdapter中的代码，使其在getView（）方法中不需要每次都将布局重新加载一遍，优化代码如下：

public class CategoryAdapter extends ArrayAdapter<Category> {private int resourceId;public CategoryAdapter(Context context, int resource, List<Category> objects) {super(context, resource, objects);resourceId = resource;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Category category = getItem(position);// 获取当前项的Category实例// View view=LayoutInflater.from(getContext()).inflate(resourceId,// null);View view;ViewHolder viewHolder;if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(resourceId, null);viewHolder = new ViewHolder();viewHolder.categoryImage = (ImageView) view.findViewById(R.id.category_image);viewHolder.categoryName = (TextView) view.findViewById(R.id.category_name);view.setTag(viewHolder);//将ViewHolder存储在View中} else {view = convertView;viewHolder = (ViewHolder) view.getTag();//重新获取ViewHolder}//ImageView caImageImage = (ImageView) view//.findViewById(R.id.category_image);//TextView categoryName = (TextView) view//.findViewById(R.id.category_name);//categoryImage.setImageResource(category.getImageId());//categoryName.setText(category.getName());viewHolder.categoryImage.setImageResource(category.getImageId());viewHolder.categoryName.setText(category.getName());return view;}class ViewHolder {ImageView categoryImage;TextView categoryName;}}

当用户点击了ListView中的任何一个子项，然后获取到相应的类别，并通过Toast将类别的名字显示出来。

其次，修改MainActivity代码，将其与之前建立的主界面连接起来。
如图所示

三、显示所有动物类成语的列表

接下来，应该将数据库中的所有的动物类成语显示在界面上，在layout下新建Activity_animal.xml文件，主要添加了一个ListView控件，代码如下

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/bg_animal"    android:orientation="vertical" >    <ListView        android:id="@+id/IvAnimalList"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layoutAnimation="@anim/anim_layout_listview"        android:listSelector="#00000000" >    </ListView></LinearLayout>

在layout目录下新建animal_item.xml文件，代码如下

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="10dp" >    <TextView        android:id="@+id/tvName"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:gravity="center"        android:text="助人为乐"        android:textAppearance="?android:attr/textAppearanceLarge" />    <ImageButton        android:id="@+id/btnSave"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_alignTop="@+id/tvName"        android:background="@null"        android:src="@drawable/btnsave" /></RelativeLayout>

创建一个自定义的适配器，新建类AnimalAdapter,代码如下

public class AnimalAdapter extends ArrayAdapter<Animal> {private int resourceId;private Context context;public AnimalAdapter(Context context, int resource, List<Animal> objects) {super(context, resource, objects);this.context = context;resourceId = resource;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {final Animal animal = getItem(position);//获取当前项的Animal实例View view;ViewHolder viewHolder;if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(resourceId, null);viewHolder = new ViewHolder();viewHolder.tvName = (TextView) view.findViewById(R.id.tvName);viewHolder.btnSave = (ImageButton) view.findViewById(R.id.btnSave);viewHolder.btnSave.setFocusable(false);viewHolder.btnSave.setFocusableInTouchMode(false);viewHolder.btnSave.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View view) {Toast.makeText(context, "你要收藏" + animal.getName() + "吗",Toast.LENGTH_SHORT).show();}});view.setTag(viewHolder);//将ViewHolder存储在View中} else {view = convertView;viewHolder = (ViewHolder) view.getTag();//重新获取ViewHolder}viewHolder.tvName.setText(animal.getName());return view;}class ViewHolder {TextView tvName;ImageButton btnSave;}}

接下来，在Activity包下新建StudyAnimalActivity继承自Activity，代码如下

public class StudyAnimalActivity extends Activity {private List<Animal> animalList;private AnimalDao animalDao;private ListView lvAnimalList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_animal);initAnimals();lvAnimalList = (ListView) findViewById(R.id.IvAnimalList);AnimalAdapter animalAdapter = new AnimalAdapter(this,R.layout.animal_item, animalList);lvAnimalList.setAdapter(animalAdapter);lvAnimalList.setOnItemClickListener(new OnItemClickListener() {public void onItemClick(AdapterView<?> adapterView,View view,int position,long id){Animal animal = animalList.get(position);String result = animal.getName() + "\n" + animal.getPronounce()+ "\n[解释]：" + animal.getExplain() + "\n[近义词]："+ animal.getHomoionym() + "\n[反义词]："+ animal.getAntonym() + "\n[来源]："+ animal.getDerivation() + "\n[示例]："+ animal.getExampless();DialogUtil.showDialog(result, StudyAnimalActivity.this);}});}private void initAnimals() {animalDao = AnimalDao.getInstance(this);animalList = animalDao.getAllAnimals();}}

接下来修改StudyActivity中的点击事件

此时点击收藏按钮没有任何反应，修改AnimalAdapter类，加入事件处理，代码如下

public class AnimalAdapter extends ArrayAdapter<Animal> {private int resourceId;private Context context;public AnimalAdapter(Context context, int resource, List<Animal> objects) {super(context, resource, objects);this.context = context;resourceId = resource;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {final Animal animal = getItem(position);//获取当前项的Animal实例View view;ViewHolder viewHolder;if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(resourceId, null);viewHolder = new ViewHolder();viewHolder.tvName = (TextView) view.findViewById(R.id.tvName);viewHolder.btnSave = (ImageButton) view.findViewById(R.id.btnSave);viewHolder.btnSave.setFocusable(false);viewHolder.btnSave.setFocusableInTouchMode(false);viewHolder.btnSave.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View view) {Toast.makeText(context, "你要收藏" + animal.getName() + "吗",Toast.LENGTH_SHORT).show();}});view.setTag(viewHolder);//将ViewHolder存储在View中} else {view = convertView;viewHolder = (ViewHolder) view.getTag();//重新获取ViewHolder}viewHolder.tvName.setText(animal.getName());return view;}class ViewHolder {TextView tvName;ImageButton btnSave;}}

点击一下收藏按钮，就会显示提示是否收藏当前的成语，如图所示

四、显示每条成语的详细信息

首先在Layout下新建布局文件dialog_info.xml，代码如下

<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="@drawable/bg_ling"        android:orientation="vertical" >                        <TextView android:id="@+id/tvIdiomInfo"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:text="Medium Text"            android:textAppearance="?android:attr/textAppearanceMedium"/>    </LinearLayout>    </ScrollView>

最外层的ScrollView组件，当内容较多时会自动出现垂直滚动条。

在util包下新建DialogUtil类，代码如下：

public class DialogUtil {public static void showDialog(String result, Context context) {AlertDialog.Builder builder = new AlertDialog.Builder(context);LayoutInflater layoutInflater = LayoutInflater.from(context);View view = layoutInflater.inflate(R.layout.dialog_info, null);builder.setView(view);TextView tvIdiomInfo = (TextView) view.findViewById(R.id.tvIdiomInfo);tvIdiomInfo.setText(result);builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubdialog.dismiss();}});builder.create().show();}}

编辑完成后，修改图标和名称，最后如图所示：