Android Auto CompleteTexview

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代码：

MainActivity.java

package com.example.happydictionary;
import com.example.happydictionary.adapter.DictionaryAdapter;
import com.example.happydictionary.db.DBHelper;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity 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
}

}

DictionaryAdapter.java

</pre><pre name="code" class="java">package com.example.happydictionary.adapter;
import com.example.happydictionary.R;
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;
//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);
}
}

WordDac.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;
}

}

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 android.content.Context;
import android.database.Cursor;
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 NAME = "name";
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;
}

public Cursor query(String name) {
SQLiteDatabase db = this.getReadableDatabase();
return db.rawQuery("select * from t_words where english like ‘%" + name + "%‘ limit 10", null);
}

private SQLiteDatabase getReadableDatabase() {
// TODO Auto-generated method stub
return null;
}



}

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;
}

}

activity_main.xml

<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" >
<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" />

<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>

</RelativeLayout>

word_list_item.xml

<?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" />

Android Auto CompleteTexview

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原文地址：http://www.cnblogs.com/xilika/p/4617352.html