有道词典

      很喜欢使用有道词典进行查阅，现在也想自己试着仿照它做一个有道词典

     首先界面需要EditText,Button,WebView 和Toast 四个控件   

主要布局文件： 

<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" >    <EditText        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="27dp"        android:background="@android:drawable/edit_text"        android:ems="10"        android:singleLine="true"        android:textColor="#552006"        android:textColorHint="#782f10" >        <requestFocus />    </EditText>    <Button        android:id="@+id/btnSearch"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/tvSearchResult"        android:layout_alignTop="@+id/etWord"        android:background="@drawable/ibsearchword"        android:onClick="search" />    <WebView        android:id="@+id/wvSearchResult"        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:background="@drawable/bg_roundcorner"        android:textAppearance="?android:attr/textAppearanceMedium"        android:textSize="25sp" /></RelativeLayout>

主类：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.EditText;import android.widget.TextView;import com.example.happydictionary.dao.WordDao;public class MainActivity extends Activity {private WordDao wordDao;private EditText etWord;private TextView tvResult;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initViews();}private void initViews() {etWord = (EditText) findViewById(R.id.etWord);tvResult = (TextView) findViewById(R.id.tvSearchResult);}@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;}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);}}}

WordDao.java

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;     }}

随后需要数据库存储数据DBHelper.java

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;}}

Word实体类 Word.java

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;}}

运行后，界面会是这个样子：