用AutoCompleteTextView实现自动提示

运行图：


步骤：

1,将EditText改成AutoCompleteTextView

2，在values/strings.xml中

<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>

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);

((AutoCompleteTextView) etWord).setAdapter(aaa);

代码：

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

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 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

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

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

<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

<?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>