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我正在創建字典英語 - 越南語應用程序。我想將搜索功能添加到我的listView。我想用Word（英文）搜索。但我不知道如何放置數據庫才能顯示列表視圖，所以我放了一個數組來顯示。有沒有人幫助我如何使數據庫顯示搜索功能ListView？如何使數據庫顯示搜索功能ListView
它的數據庫處理器類
public class DatabaseHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "dictionaryManager";
// Contacts table name
private static final String TABLE_DICTIONARY = "Dictionary";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_WORD = "word";
private static final String KEY_DATA = "data";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_DICTIONARY_TABLE = "CREATE TABLE " + TABLE_DICTIONARY + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_WORD + " TEXT,"
+ KEY_DATA + " TEXT" + ")";
db.execSQL(CREATE_DICTIONARY_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_DICTIONARY);
// Create tables again
onCreate(db);
}
/**
* All CRUD(Create, Read, Update, Delete) Operations
*/
// Adding new
void addDictionary(Dictionary dictionary) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_WORD, dictionary.getWord()); // Word: English
values.put(KEY_DATA, dictionary.getData()); // Data: Vietnam
// Inserting Row
db.insert(TABLE_DICTIONARY, null, values);
db.close(); // Closing database connection
}
// Getting single
Dictionary getDictionary(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_DICTIONARY, new String[] { KEY_ID,
KEY_WORD, KEY_DATA }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Dictionary dictionary = new Dictionary(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2));
// return
return dictionary;
}
// Getting All Dictionary
public List<Dictionary> getAllDictionary() {
List<Dictionary> dictionaryList = new ArrayList<Dictionary>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_DICTIONARY;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Dictionary dictionary = new Dictionary();
dictionary.setID(Integer.parseInt(cursor.getString(0)));
dictionary.setWord(cursor.getString(1));
dictionary.setData(cursor.getString(2));
// Adding contact to list
dictionaryList.add(dictionary);
} while (cursor.moveToNext());
}
// return list
return dictionaryList;
}
// Updating single
public int updateDictionary(Dictionary dictionary) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_WORD, dictionary.getWord());
values.put(KEY_DATA, dictionary.getData());
// updating row
return db.update(TABLE_DICTIONARY, values, KEY_ID + " = ?",
new String[] { String.valueOf(dictionary.getID()) });
}
// Deleting single
public void deleteDictionary(Dictionary dictionary) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_DICTIONARY, KEY_ID + " = ?",
new String[] { String.valueOf(dictionary.getID()) });
db.close();
}
// Getting Count
public int getDictionaryCount() {
String countQuery = "SELECT * FROM " + TABLE_DICTIONARY;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
SQLiteActivity類
public class SQLiteActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DatabaseHandler db = new DatabaseHandler(this);
/**
* CRUD Operations
* */
// Inserting
Log.d("Insert: ", "Inserting ..");
db.addDictionary(new Dictionary("Apple", "Trai tao"));
db.addDictionary(new Dictionary("Bear", "Con gau"));
// Reading all dictionary
Log.d("Reading: ", "Reading all dictionary..");
List<Dictionary> dictionary = db.getAllDictionary();
for (Dictionary dt : dictionary) {
String log = "Id: "+dt.getID()+" ,Word: " + dt.getWord() + " ,Data: " + dt.getData();
// Writing Dictionary to log
Log.d("Word: ", log);
//OnClick to change Activity
Button btn = (Button)findViewById(R.id.btntim);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(SQLiteActivity.this, LookupActivity.class);
startActivity(i);
}
});
}
}
}
字典類：
public class Dictionary {
//private variables
int _id;
String _word;
String _data;
// Empty constructor
public Dictionary(){
}
// constructor
public Dictionary(int id, String word, String data){
this._id = id;
this._word = word;
this._data = data;
}
// constructor
public Dictionary(String word, String data){
this._word = word;
this._data = data;
}
// getting ID
public int getID(){
return this._id;
}
// setting id
public void setID(int id){
this._id = id;
}
// getting word
public String getWord(){
return this._word;
}
// setting word
public void setWord(String word){
this._word = word;
}
// getting data
public String getData(){
return this._data;
}
// setting data
public void setData(String data){
this._data = data;
}
}
最後，這是LookupActivity。在下面的代碼中，我將所有列表數據存儲在名爲words []的數組中，並使用簡單的ArrayAdapter附加到listview。因此，如何使數據庫顯示搜索功能的ListView：
package com.dictionary.tudienandroid;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
public class LookupActivity extends Activity {
// List view
private ListView lv;
// Listview Adapter
ArrayAdapter<String> adapter;
// Search EditText
EditText inputSearch;
// ArrayList for Listview
ArrayList<HashMap<String, String>> productList;
DatabaseHandler mDB;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maintim);
// Listview Data
String words[] ={"Kungfu","Long"};
lv = (ListView) findViewById(R.id.list_view);
inputSearch = (EditText) findViewById(R.id.inputSearch);
// Adding items to listview
adapter = new ArrayAdapter<String>(this, R.layout.list_item, R.id.word, words);
lv.setAdapter(adapter);
/**
* Enabling Search Filter
* */
inputSearch.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
LookupActivity.this.adapter.getFilter().filter(cs);
}
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
}
}