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用AutoCompleteTextView实现自动提示

时间：2024-3-2 18:20     作者：韩俊     分类： Android

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>



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