英语查询小编程

<img src="https://img-blog.csdn.net/20150623143252561?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbGl1eXV4aWFfMjAxNQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

<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" >

</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>

分析：定义textview组件，来显示所查询的单词，又定义了<span style="font-family: Arial, Helvetica, sans-serif;">AutoCompleteTextView组件，可以查询显示多个单词的效果</span>

<pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tvWordItem"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:minHeight="?android:attr/listPreferredItemHeight"
android:paddingLeft="6dip"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@color/gray" />

<pre name="code" class="html">import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import com.bzu.gxs.dao.DictionaryAdapter;
import com.bzu.gxs.db.DBHelper;
import com.bzu.gxs.R;

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.TextView;

public class Dictionary extends Activity implements OnClickListener,
TextWatcher {
private DBHelper dbHelper; // 用户输入文本框
private AutoCompleteTextView word; // 定义数据库的名字
private SQLiteDatabase database;
private Button searchWord; // 搜索按钮
private TextView showResult; // 用户显示查询结果

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

dbHelper = new DBHelper(getBaseContext());// 打开数据库
database = dbHelper.openDatabase();

init();

searchWord.setOnClickListener(this); // 绑定监听器
word.addTextChangedListener(this); // 绑定文字改变监听器

}

public void init() {
searchWord = (Button) findViewById(R.id.btnSearch);
word = (AutoCompleteTextView) findViewById(R.id.etWord);
showResult = (TextView) findViewById(R.id.tvSearchResult);

}

public void afterTextChanged(Editable s) {
Cursor cursor = database.rawQuery(
"select english as _id from t_words where english like ?",
new String[] { s.toString() + "%" });

// 新建新的Adapter
DictionaryAdapter dictionaryAdapter = new DictionaryAdapter(this,cursor, true);

// 绑定适配器
word.setAdapter(dictionaryAdapter);

}

public void beforeTextChanged(CharSequence s, int start, int count,
int after) {

}

public void onTextChanged(CharSequence s, int start, int before, int count) {

}

public void onClick(View view) {
// 查询指定的单词
String sql = "select chinese from t_words where english=?";

Cursor cursor = database.rawQuery(sql, new String[] { word.getText()
.toString() });

String result = "查无该词"; // 如果查找单词，显示其中文的意思

if (cursor.getCount() > 0) {

cursor.moveToFirst(); // 须使用moveToFirst方法将记录指针移动到第1条记录的位置
result = cursor.getString(cursor.getColumnIndex("chinese"))
.replace("&", "&");
}

showResult.setText(word.getText() + "\n" + result.toString());// 将结果显示到TextView中
}

}

</pre>

import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.TextView;
import com.bzu.gxs.R;

//自定义Adapter类
public class DictionaryAdapter extends CursorAdapter {
private LayoutInflater layoutInflater;

@Override
public CharSequence convertToString(Cursor cursor) {
return cursor == null ? "" : cursor.getString(cursor
.getColumnIndex("_id"));
}

// 将单词信息显示到列表中
private void setView(View view, Cursor cursor) {
TextView tvWordItem = (TextView) view;
tvWordItem.setText(cursor.getString(cursor.getColumnIndex("_id")));
}

// 绑定选项到列表中
@Override
public void bindView(View view, Context context, Cursor cursor) {
setView(view, cursor);
}

// 生成新的选项
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View view = layoutInflater.inflate(R.layout.word_list_item, null);
setView(view, cursor);
return view;
}

public DictionaryAdapter(Context context, Cursor c, boolean autoRequery) {
super(context, c, autoRequery);
layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
}

<span style="font-family:Arial, Helvetica, sans-serif;"></span><pre name="code" class="html">import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import com.bzu.gxs.R;
public class DBHelper {
//定义数据库的存放路
4000
径
private final String DATABASE_PATH = android.os.Environment
.getExternalStorageDirectory().getAbsolutePath()
+ "/dictionary";
private final String DATABASE_FILENAME = "dictionary.db";

private Context context;

public DBHelper(Context context) {
this.context = context;
}

public SQLiteDatabase openDatabase()
{
try
{
// 获得dictionary.db文件的绝对路径
String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME;
File dir = new File(DATABASE_PATH);
// 如果/sdcard/dictionary目录中存在，创建这个目录
if (!dir.exists())
dir.mkdir();
// 如果在/sdcard/dictionary目录中不存在
// dictionary.db文件，则从res\raw目录中复制这个文件到
// SD卡的目录（/sdcard/dictionary）
if (!(new File(databaseFilename)).exists())
{
// 获得封装dictionary.db文件的InputStream对象
InputStream is = context.getResources().openRawResource(
R.raw.dictionary);
FileOutputStream fos = new FileOutputStream(databaseFilename);
byte[] buffer = new byte[8192];
int count = 0;
// 开始复制dictionary.db文件
while ((count = is.read(buffer)) > 0)
{
fos.write(buffer, 0, count);
}
//关闭文件流
fos.close();
is.close();
}
// 打开/sdcard/dictionary目录中的dictionary.db文件
SQLiteDatabase database = SQLiteDatabase.openOrCreateDatabase(
databaseFilename, null);
return database;
}
catch (Exception e)
{
}
//如果打开出错，则返回null
return null;
}

}