欢迎使用CSDN-markdown编辑器

步骤：
1,将EditText改成AutoCompleteTextView
2，在values/strings.xml中

abandon
ability
able
abnormal
aboard
about
above
abroad
absence
absent
china
japan
korean

3，在MainActivity中的onCreate方法中加ArrayAdapter aaa=ArrayAdapter.createFromResource(this, R.array.str, android.R.layout.simple_spinner_item);
aaa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
MainActivity.java

    package com.example.happydictionary;  import android.app.Activity;  import android.os.Bundle;  import android.text.TextUtils;  import android.view.Menu;  import android.view.View;  import android.widget.ArrayAdapter;  import android.widget.AutoCompleteTextView;  import android.widget.EditText;  import android.widget.TextView;  import com.example.happydictionary.dao.WordDao;  public class MainActivity extends Activity {      //private AutoCompleteTextView autotext;      //private ArrayAdapter<String> arrayAdapter;      private WordDao wordDao;      private EditText etWord;      private TextView tvResult;      @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          initViews();          //*autotext=(AutoCompleteTextView)findViewById(R.id.tvSearchResult);          //String [] arr={"aa","aab","aac"};          //arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,arr);          //autotext.setAdapter(arrayAdapter);          ArrayAdapter aaa=ArrayAdapter.createFromResource(this, R.array.str, android.R.layout.simple_spinner_item);            aaa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);            ((AutoCompleteTextView) etWord).setAdapter(aaa);       }      private void initViews() {          etWord = (EditText) findViewById(R.id.etWord);          tvResult = (TextView) findViewById(R.id.tvSearchResult);      }      @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;      }      public void searchWord(View view) {          String english = etWord.getText().toString();          wordDao = new WordDao(this);          if (TextUtils.isEmpty(english)) {              tvResult.setText("请输入您想查询的单词");          } else {              String chinese = wordDao.getChinese(english);              tvResult.setText(chinese);          }      }  }   WorldDao.java[java] view plaincopyprint?package com.example.happydictionary.dao;  import android.content.Context;  import android.database.Cursor;  import android.database.sqlite.SQLiteDatabase;  import com.example.happydictionary.db.DBHelper;  public class WordDao {       private DBHelper dbHelper;       private SQLiteDatabase sqLiteDatabase;       public WordDao(Context context){           dbHelper=new DBHelper(context);       }       public String getChinese(String english){           sqLiteDatabase=dbHelper.openDatabase();           String sql="select chinese from t_words where english=?";           Cursor cursor=sqLiteDatabase.rawQuery(sql, new String[]{english});           String chinese="查无该词";           if(cursor.moveToFirst()){               chinese=cursor.getString(cursor.getColumnIndex("chinese"));           }           return chinese;       }  }  DBHelper.java[java] view plaincopyprint?package com.example.happydictionary.db;  import java.io.File;  import java.io.FileNotFoundException;  import java.io.FileOutputStream;  import java.io.IOException;  import java.io.InputStream;  import com.example.happydictionary.R;  import com.example.happydictionary.R.raw;  import android.content.Context;  import android.database.sqlite.SQLiteDatabase;  import android.os.Environment;  import android.util.Log;  /**  * 实现将数据库文件从raw目录拷贝到手机里存放数据库的位置  *   * @author cabbage  */  public class DBHelper {      private final int BUFFER_SIZE = 400000;      public static final String DB_NAME = "idiom.db"; // 保存的数据库文件名      public static final String PACKAGE_NAME = "com.example.happydictionary";// 应用的包名      public static final String DB_PATH = "/data"              + Environment.getDataDirectory().getAbsolutePath() + "/"              + PACKAGE_NAME + "/databases";      /*// SDCard 定义数据库的存放路径     private final String DATABASE_PATH = android.os.Environment             .getExternalStorageDirectory().getAbsolutePath() + "/dictionary";*/      private Context context;      public DBHelper(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.dictionary); // 欲导入的数据库                  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;      }  }  World.java[java] view plaincopyprint?package com.example.happydictionary.entity;  public class Word {      private String english;      private String chinese;      public String getEnglish() {          return english;      }      public void setEnglish(String english) {          this.english = english;      }      public String getChinese() {          return chinese;      }      public void setChinese(String chinese) {          this.chinese = chinese;      }  }  DBHelperTest.java[java] view plaincopyprint?package com.example.happydictionary.test;  import com.example.happydictionary.db.DBHelper;  import android.test.AndroidTestCase;  public class DBHelperTest extends AndroidTestCase {       public void testCreateDB(){           DBHelper dbHelper=new DBHelper(getContext());           dbHelper.openDatabase();       }  }  activity_main.xml[html] view plaincopyprint?<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/mainbg"      android:paddingBottom="@dimen/activity_vertical_margin"      android:paddingLeft="@dimen/activity_horizontal_margin"      android:paddingRight="@dimen/activity_horizontal_margin"      android:paddingTop="@dimen/activity_vertical_margin"      tools:context=".MainActivity" >      <AutoCompleteTextView          android:id="@+id/etWord"          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:layout_alignParentLeft="true"          android:layout_alignParentTop="true"          android:layout_marginTop="31dp"          android:background="@android:drawable/edit_text"          android:ems="10"          android:hint="@string/searchHint"          android:singleLine="true"          android:textColor="#552006"          android:textColorHint="#782f10" >          <requestFocus />      </AutoCompleteTextView>      <Button          android:id="@+id/btnSearch"          android:layout_width="wrap_content"          android:layout_height="wrap_content"          android:layout_alignBaseline="@+id/etWord"          android:layout_alignBottom="@+id/etWord"          android:layout_marginLeft="16dp"          android:layout_toRightOf="@+id/etWord"          android:background="@drawable/ibsearchword"          android:onClick="searchWord"          android:text="@string/serachWord" />      <TextView          android:id="@+id/tvSearchResult"          android:layout_width="match_parent"          android:layout_height="match_parent"          android:layout_alignLeft="@+id/etWord"          android:layout_below="@+id/etWord"          android:layout_marginTop="22dp"          android:textSize="25sp"          android:background="@drawable/bg_roundcorner"          android:textAppearance="?android:attr/textAppearanceMedium" />  </RelativeLayout>  strings.xml[html] view plaincopyprint?<?xml version="1.0" encoding="utf-8"?>  <resources>      <string name="app_name">电子词典</string>      <string name="action_settings">Settings</string>      <string name="hello_world">Hello world!</string>      <string name="searchHint">请输入您要查询的单词</string>      <string name="serachWord">查询</string>      <string-array name="str">          <item>abandon</item>          <item>ability</item>          <item>able</item>          <item>abnormal</item>          <item>aboard</item>          <item>about</item>          <item>above</item>          <item>abroad</item>          <item>absence</item>          <item>absent</item>          <item>china</item>          <item>japan</item>          <item>korean</item>      </string-array>  </resources>