如何通过使用 EditText 搜索或过滤它来显示数据库中 ListView 中的数据。你能告诉我需要什么代码才能做到这一点吗？我认为我遗漏了一些东西，因为我的代码不搜索它，只是将我的数据显示在 ListView 中。任何帮助将不胜感激。
这是我的代码:
DBListHelper
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Locale;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.util.Log;
class DBlistHelper extends SQLiteOpenHelper {
private static final String DATABASE_PATH = "/data/data/com.example.searching/databases/";
private static final String DATABASE_NAME = "LPG.db";
private static final int SCHEMA_VERSION = 1;
private static final String TABLE_NAME = "Recipes";
private static final String COLUMN_ID = "_id";
private static final String COLUMN_RECIPE = "Recipe";
public static final String COLUMN_INGRIDIENTS = "Ingredients";
//public static final String COLUMN_PROCEDURE = "procedure";
public SQLiteDatabase dbSqlite;
private final Context myContext;
public DBlistHelper(Context context){
super(context, DATABASE_NAME, null, SCHEMA_VERSION );
this.myContext= context;
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void createDatabase() {
createDB();
}
public void createDB(){
boolean dbExist = DBExists();
if(!dbExist){
this.getReadableDatabase();
copyDBFromResource();
}
}
private boolean DBExists() {
SQLiteDatabase db = null;
try{
String databasePath = DATABASE_PATH + DATABASE_NAME;
db = SQLiteDatabase.openDatabase(databasePath, null, SQLiteDatabase.OPEN_READWRITE);
db.setLocale(Locale.getDefault());
db.setLockingEnabled(true);
db.setVersion(1);
} catch (SQLiteException e) {
Log.e("SqlHelper", "database not found");
}
if (db != null){
db.close();
}
return db != null ? true : false;
}
private void copyDBFromResource(){
InputStream inputStream = null;
OutputStream outStream = null;
String dbFilePath = DATABASE_PATH + DATABASE_NAME;
try{
inputStream = myContext.getAssets().open(DATABASE_NAME);
outStream = new FileOutputStream(dbFilePath);
byte [] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0){
outStream.write(buffer, 0, length);
}
outStream.flush();
outStream.close();
inputStream.close();
} catch (IOException e){
throw new Error("Problem copying database from resource file.");
}
}
public void openDatabase () throws SQLException {
String myPath = DATABASE_PATH + DATABASE_NAME;
dbSqlite = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}
@Override
public synchronized void close () {
if (dbSqlite !=null){
dbSqlite.close();
}
super.close();
}
public Cursor getCursor() {
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder ();
queryBuilder.setTables(TABLE_NAME);
String [] asColumnsToReturn = new String [] { COLUMN_ID, COLUMN_RECIPE, COLUMN_INGRIDIENTS};
Cursor mCursor = queryBuilder.query(dbSqlite, asColumnsToReturn, null, null, null, null, "Recipe ASC");
return mCursor;
}
public String getName (Cursor c){
return(c.getString(1));
}
}
Main.java
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
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.widget.AdapterView;
import android.widget.CursorAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
public class Main extends Activity {
private DBlistHelper dbrecipelistHelper = null;
private Cursor ourCursor = null;
private recipeAdapter adapter = null;
EditText inputSearch = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
try
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
inputSearch = (EditText) findViewById(R.id.inputSearch);
ListView myListView = (ListView) findViewById(R.id.listView);
dbrecipelistHelper = new DBlistHelper(this);
dbrecipelistHelper.createDatabase();
dbrecipelistHelper.openDatabase();
ourCursor=dbrecipelistHelper.getCursor();
startManagingCursor(ourCursor);
adapter = new recipeAdapter(ourCursor);
myListView.setAdapter(adapter);
//myListView.setOnItemClickListener(onListClick);
}
catch (Exception e)
{
Log.e("ERROR", "ERROR IN CODE: " + e.toString());
e.printStackTrace();
}
inputSearch.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
// When user changed the Text
Main.this.adapter.getFilter().filter(cs);
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});
}
class recipeAdapter extends CursorAdapter {
recipeAdapter(Cursor c){
super(Main.this, c);
}
@Override
public void bindView (View row, Context ctxt, Cursor c)
{
recipeHolder holder = (recipeHolder)row.getTag();
holder.populateFrom(c, dbrecipelistHelper);
}
@Override
public View newView(Context ctxt, Cursor c, ViewGroup parent)
{
LayoutInflater inflater = getLayoutInflater();
View row=inflater.inflate(R.layout.list, parent, false);
recipeHolder holder = new recipeHolder(row);
row.setTag(holder);
return(row);
}
}
static class recipeHolder {
private TextView name=null;
recipeHolder(View row){
name=(TextView)row.findViewById(R.id.recipeText);
}
void populateFrom(Cursor c, DBlistHelper r){
name.setText(r.getName(c));
}
}
}
最佳答案
要搜索定义编辑文本的值并在数据库中实现文本观察器，请输入如下所示的查询:
editText.addTextChangedListener(new TextWatcher(){
Cursor cusror;
cursor=db.rawQuery("SELECT * FROM "+ DB_NAME + " WHERE "
+ DB_NAME.id + " = " + DB_NAME.Id + " AND " + DB_NAME.Title +
" LIKE '"+search.getText()+"%'");
检查值，如果获得正确的值，则返回光标。 希望能帮助到你。
关于Android:如何在sqlite数据库中搜索数据并将其显示在 ListView 中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29292569/