乐学成语项目的实现

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  首先给软件取名为HappyIdiom,在开始编码之前,需要先对程序进行需求分析,想一想HappyIdiom中应该具备哪些功能。将这些功能全部整理出来之后,我们才好动手一一实现。这里我认为HappyIdiom中至少应该具备以下功能:

1.成语分类学习:你可以根据自己喜欢的分类(动物类、人物类、季节类、自然类、数字类、语言类、其他类)来进行学习。

2.乐猜成语:学习之余玩玩猜成语游戏,寓教于乐。

3.成语收藏:当用户遇到自己想要保存的成语,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,如一心一意可输入:yxyy。

  虽然看上去只有四个主要的功能点,但如果想要全部实现这些功能却用到UI/网络、数据存储等技术,因此还是非常考验综合能力的。

  分析完了需求之后,接下来就要进行技术的可行性分析了。首先要考虑的一个问题就是,我们如何才能得到所有的成语数据,以及如何才能获取每个成语的读音,解释,近义词反义词等信息。聚合网给我们提供了免费的聚合数据,网址如下:https://www.juhe.cn/docs/api/id/157  也可以从网上查找。

获取了数据库版本之后,就开始创建HappyIdiom这个项目了,在Eclipse中新建一个Android项目,项目名叫做HappyIdiom,包名叫做cn.edu.bztc.HappyIdiom,使用的是4.2的API,如图所示:

创建好了之后,然后再创建几个包,如图所示:

在res目录下新建raw目录,将idioms.db数据库复制到此目录下。这是因为raw目录的东西,android会原封不动的拷贝到程序中,而不会转换为二进制文件。在db包下新建一个DBOpenHelper类,代码如下:

package cn.edu.bztc.happyidiom.db;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.os.Environment;import android.util.Log;import cn.edu.bztc.happyidiom.R;public class DBOpenHelper {private final int BUFFER_SIZE = 400000;public static final String DB_NAME = "idioms.db";public static final String PACKAGE_NAME = "cn.edu.bztc.happyidiom";public static final String DB_PATH = "/data"+ Environment.getDataDirectory().getAbsolutePath() + "/"+ PACKAGE_NAME + "/databases";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();}String dbfile = myDataPath + "/" + DB_NAME;if (!(new File(dbfile).exists())) {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("Dtaabase", "IO exception");e.printStackTrace();}return null;}}

上面的代码功能主要是使用输出流将idioms.db复制到手机中默认存放数据库的位置。

接下来在test包下,新建DBOpenHelperTest继承AndoidTestCase。代码如下:

package cn.edu.bztc.happyidiom.test;import cn.edu.bztc.happyidiom.db.DBOpenHelper;import android.test.AndroidTestCase;public class DBOpenHelperTest extends AndroidTestCase {public void testDBCopy() {DBOpenHelper dbOpenHelper = new DBOpenHelper(getContext());dbOpenHelper.openDatabase();}}

然后在entity包下新建一个Animal类,代码如下:

package cn.edu.bztc.happyidiom.entity;public class Animal {private int id;private String name;private String pronounce;private String explain;private String antonym;private String homoionym;private String derivation;private String examples;public int getId() {return id;}public void setId(int id) {this.id = id;}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 getExamples() {return examples;}public void setExamples(String examples) {this.examples = examples;}}


可以看到,实体类的内容非常简单,基本就是生成数据库对应字段的get和set方法就可以了。接下来需要创建一个AnimalDao类,这个类可以将会把一些常用的数据库操作封装起来,以方便我们后面使用,代码如下所示:

package cn.edu.bztc.happyidiom.dao;import java.util.ArrayList;import java.util.List;import cn.edu.bztc.happyidiom.db.DBOpenHelper;import cn.edu.bztc.happyidiom.entity.Animal;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;public class AnimalDao {private static AnimalDao animalDao;private SQLiteDatabase db;private AnimalDao(Context context) {DBOpenHelper dbHelper = new DBOpenHelper(context);db = dbHelper.openDatabase();}public synchronized static AnimalDao getInstance(Context context) {if (animalDao == null) {animalDao = new AnimalDao(context);}return animalDao;}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("antonym")));animal.setDerivation(cursor.getString(cursor.getColumnIndex("derivation")));animal.setExamples(cursor.getString(cursor.getColumnIndex("examples")));list.add(animal);} while (cursor.moveToNext());}return list;}}


可以看到,AnimalDao是一个单例类,我们将它的构造方法私有化,并提供了一个getInstance()方法来获取AnimalDao的实例,这样就可以保证全局范围内只会有一个AnimalDao的实例。接下来我们在AnimalDao中提供了一个方法getAllAnimals()该方法用来获取所有的动物类成语。编写单元测试类AnimalDaoTest继承AndroidTestCase,代码如下:

package cn.edu.bztc.happyidiom.test;import java.util.List;import cn.edu.bztc.happyidiom.dao.AnimalDao;import cn.edu.bztc.happyidiom.entity.Animal;import android.test.AndroidTestCase;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());}}}


主界面的设计采用选项卡组件,在res的drawable-hdpi目录考入需要的图片素材,在res/layout目录中新建activity_main.xml布局,代码如下所示:

<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"                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>



布局文件中的内容比较简单,主要是拖了一个TabHost空间到界面上

然后再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">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></resources>


接下来也是最关键的一步,在activity包下新建MianActivity继承自Activity,代码如下所示:

package cn.edu.bztc.happyidiom.avtivity;import android.app.TabActivity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.Window;import android.widget.TabHost;import cn.edu.bztc.happyidiom.R;public class MainActivity extends TabActivity {private TabHost tabHost;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);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.search,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)));}public boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}}


然后定义一个实体类,作为ListView适配器的适配类型。在entity包下新建Category,代码如下所示:

package cn.edu.bztc.happyidiom.entity;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 int getImageId() {return imageId;}}


Category类中只有两个字段,name表示类的名字,imageId表示类别对应图片的资源id。

在layout下新建activity_study.xml文件,主要添加了一个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/lvCategories"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layoutAnimation="@anim/anim_layout_listview"        android:listSelector="#00000000" >    </ListView></RelativeLayout>


然后需要为ListView的子项指定一个我们自定义的布局,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>


在这个布局中,我们定义了一个ImageView用于显示类别图片,又定义了一个TextView用于显示类别的名称。接下来需要在应用包下创建adapter包,再改包下创建一个自定义的适配器,这个适配器继承自ArrayAdapter,并将泛型指定为Category类,新建类CategoryAdapter,代码如下所示:

package cn.edu.bztc.happyidiom.adapter;import java.util.List;import cn.edu.bztc.happyidiom.R;import cn.edu.bztc.happyidiom.entity.Category;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageView;import android.widget.TextView;public class CategoryAdapter extends ArrayAdapter<Category> {private int resourceId;public CategoryAdapter(Context context, int resource, List<Category> objects) {super(context, resource, objects);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.categoryImage = (ImageView) view.findViewById(R.id.category_image);viewHolder.categoryName = (TextView) view.findViewById(R.id.category_name);view.setTag(viewHolder);} else {view = convertView;viewHolder = (ViewHolder) view.getTag();}viewHolder.categoryImage.setImageResource(category.getImageId());viewHolder.categoryName.setText(category.getName());return view;}}


CategoryAdapter重写了父类的一组构造函数,用于将上下文、ListView子项布局id和数据都传递进来。另外有重写了getView()方法,这个方法每个子项被滚动到屏幕内的时候调用。在getView方法中,首先通过getItem()方法得到当前项的Category实例,然后使用L ayouInflater来为这个字项加载我们传入的布局,接着调用View的findViewById()方法分别获取ImageView和TextView的实例,并分别调用它们的setImageResource()和SetText()方法来设置爱显示的图片和文字,最后将布局返回,这样我们自定义的适配器就完成了,下面在activity包下新建StudyActivity继承自Activity,代码如下所示:

package cn.edu.bztc.happyidiom.avtivity;import java.util.ArrayList;import java.util.List;import cn.edu.bztc.happyidiom.*;import cn.edu.bztc.happyidiom.adapter.CategoryAdapter;import cn.edu.bztc.happyidiom.entity.Category;import android.app.Activity;import android.content.Intent;import android.content.res.Resources;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.Toast;public class StudyActivity extends Activity {private List<Category> categoryList;private String[] category_names;private int[] category_images;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() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view,int position, long id) {switch (position) {case 0:Intent intent = new Intent(StudyActivity.this,StudyAnimalActivity.class);startActivity(intent);break;default:break;}Category category = categoryList.get(position);Toast.makeText(StudyActivity.this, category.getName(),Toast.LENGTH_LONG).show();}});}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]));}}public boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.study, menu);return true;}}


可以看到,这里添加了一个initCategories()方法,用于初始化类别数据。接着我们在onCreate()方法中创建了一个CategoryAdapter对象,并将CategoryAdapter作为适配器传递给了List。这样定制的ListView界面任务就完成了。

修改清单文件AndroidManifest.xml,代码如下所示:

<?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" >        <uses-library android:name="android.test.runner" />        <activity            android:name="cn.edu.bztc.happyidiom.avtivity.MainActivity"            android:label="@string/title_activity_main"            android:theme="@android:style/Theme.NoTitleBar" >            <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.avtivity.StudyActivity" >        </activity>        <activity android:name="cn.edu.bztc.happyidiom.avtivity.StudyAnimalActivity" >        </activity>    </application>    <instrumentation        android:name="android.test.InstrumentationTestRunner"        android:targetPackage="cn.edu.bztc.happyidiom" >    </instrumentation></manifest>


这时界面载入的过程有些生硬,下面为界面增加淡入淡出的动画效果,在res目录下新建anim目录,在下面创建anim_listview.xml文件,代码如下:

<?xml version="1.0" encoding="utf-8"?><alpha xmlns:android="http://schemas.android.com/apk/res/android"    android:duration="1000"    android:fromAlpha="0.0"    android:toAlpha="1.0" ></alpha>


设置了一个Alpa动画,从无到有的过程,创建anim_layout_listview.xml文件,代码如下:

<?xml version="1.0" encoding="utf-8"?><layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android"    android:animation="@anim/anim_listview"    android:animationOrder="random"    android:delay="0.2" ></layoutAnimation>


在layout下新建activity_animal.xml文件,主要添加了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/lvAnimalList"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layoutAnimation="@anim/anim_layout_listview"        android:listSelector="#00000000" >    </ListView></LinearLayout>


然后需要为ListView的子项指定一个我们自定义的布局,在layout目录下新建animal_item.xml,代码如下所示:

<?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>


接下来需要在应用包下创建adapter包,再改包下创建一个自定义的适配器,这个适配器继承自ArrayAdapter,并将泛型指定为Animal类,新建类AnimalAdapter,代码如下所示:

package cn.edu.bztc.happyidiom.adapter;import java.util.List;import cn.edu.bztc.happyidiom.R;import cn.edu.bztc.happyidiom.entity.Animal;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageButton;import android.widget.TextView;import android.widget.Toast;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;}public View getView(int position, View convertView, ViewGroup parent) {final Animal animal = getItem(position);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);} else {view = convertView;viewHolder = (ViewHolder) view.getTag();}viewHolder.tvName.setText(animal.getName());return view;}}


下面在activity包下新建StudyAnimalActivity继承自Activity,代码如下所示:

package cn.edu.bztc.happyidiom.avtivity;import java.util.List;import cn.edu.bztc.happyidiom.R;import cn.edu.bztc.happyidiom.adapter.AnimalAdapter;import cn.edu.bztc.happyidiom.dao.AnimalDao;import cn.edu.bztc.happyidiom.entity.Animal;import cn.edu.bztc.happyidiom.util.DialogUtil;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;public class StudyAnimalActivity extends Activity {private List<Animal> animalList;private AnimalDao animalDao;private ListView lvAnimalList;protected void onCreate(Bundle savedstInanceState) {super.onCreate(savedstInanceState);setContentView(R.layout.activity_animal);initAnimals();lvAnimalList = (ListView) findViewById(R.id.lvAnimalList);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.getExamples() + "\n【示例】:"+ animal.getExamples();DialogUtil.showDialog(result, StudyAnimalActivity.this);}});}private void initAnimals() {animalDao = AnimalDao.getInstance(this);animalList = animalDao.getAllAnimals();}}



在layout下新建布局文件dialog_info.xml,代码如下所示:

<?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>


在util包下新建DialogUtil类,代码如下:

package cn.edu.bztc.happyidiom.util;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.view.LayoutInflater;import android.view.View;import android.widget.TextView;import cn.edu.bztc.happyidiom.R;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();}}



最后运行一下程序:


 



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