这是我的数据库，我将所有信息存储在上面 名单。
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 = "imagedb";
private static final String TAG = "DataBaseHandler";
// Contacts table name
private static final String TABLE_CONTACTS = "contacts";
// Contacts Table Columns names
public static final String KEY_ID = "id";
public static final String KEY_NAME = "name";
public static final String KEY_PRICE = "price";
public static final String KEY_IMAGE = "image";
public static final String KEY_SEARCH = "searchData";
public DataBaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"+
KEY_PRICE + " TEXT," + KEY_SEARCH + " TEXT,"
+" UNIQUE (" + KEY_NAME + "));" + KEY_IMAGE + " BLOB" + ")";
Log.w(TAG, CREATE_CONTACTS_TABLE);
db.execSQL(CREATE_CONTACTS_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
// Create tables again
onCreate(db);
}
/**
* All CRUD(Create, Read, Update, Delete) Operations
*/
public// Adding new contact
long addContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
String searchValue = contact._name + " ";
values.put(KEY_NAME, contact._name); // Contact Name
values.put(KEY_PRICE, contact._price); // Contact Name
values.put(KEY_IMAGE, contact._image); // Contact Phone
values.put(KEY_SEARCH, searchValue); // Contact Phone
// Inserting Row
return db.insert(TABLE_CONTACTS, null, values);
}
// Getting All Contacts
public List<Contact> getAllContacts() {
List<Contact> contactList = new ArrayList<Contact>();
// Select All Query
String selectQuery = "SELECT * FROM contacts ORDER BY name";
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(2));
contact.setPrice(cursor.getString(1));
contact.setImage(cursor.getBlob(4));
contact.setSearch(cursor.getString(3));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
// close inserting data from database
db.close();
// return contact list
return contactList;
}
public Cursor searchCustomer(String inputText) throws SQLException {
Log.w(TAG, inputText);
String query = " SELECT id as _id," + KEY_NAME + "," + KEY_PRICE +
" from " + TABLE_CONTACTS +
" where " + KEY_SEARCH + " LIKE '" + inputText + "';";
Log.w(TAG, query);
SQLiteDatabase db = this.getWritableDatabase();
Cursor mCursor = db.rawQuery(query,null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
// Getting contacts Count
public int getContactsCount() {
String countQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
这是我的搜索功能，当我搜索单词时，列表视图 应该显示与单词匹配的搜索结果。但是，清单 视图无法显示搜索结果。是因为数据没有得到 从数据库？
public class Search extends Activity implements
SearchView.OnQueryTextListener,
SearchView.OnCloseListener{
private ListView mListView;
private SearchView searchView;
DataBaseHandler db;
private TextView nameText;
private TextView priceText;
private SimpleAdapter customers;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search);
searchView = (SearchView) findViewById(R.id.searchView);
searchView.setIconifiedByDefault(false);
searchView.setOnQueryTextListener(this);
searchView.setOnCloseListener(this);
mListView = (ListView) findViewById(R.id.list1);
db = new DataBaseHandler(this);
}
public boolean onQueryTextChange(String newText) {
showResults(newText + "*");
return false;
}
public boolean onQueryTextSubmit(String query) {
showResults(query + "*");
return false;
}
public boolean onClose() {
showResults("");
return false;
}
private void showResults(String query) {
Cursor cursor = db.searchCustomer((query != null ? query.toString() :
"@@@@"));
if (cursor == null) {
//
} else {
// Specify the columns we want to display in the result
String[] from = new String[] {
DataBaseHandler.KEY_NAME,
DataBaseHandler.KEY_PRICE};
// Specify the Corresponding layout elements where we want the
columns to go
int[] to = new int[] { R.id.txtTitle,
R.id.txtPrice};
System.out.println("hello1");
// Create a simple cursor adapter for the definitions and apply them
to the ListView
SimpleCursorAdapter customers = new
SimpleCursorAdapter(this,R.layout.result, cursor, from, to);
mListView.setAdapter(customers);
System.out.println("hell1");
// Define the on-click listener for the list items
mListView.setOnItemClickListener(new
AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int
position, long id) {
// Get the cursor, positioned to the corresponding row in
the result set
Cursor cursor = (Cursor)
mListView.getItemAtPosition(position);
System.out.println("hel1");
// Get the state's capital from this row in the database.
String name =
cursor.getString(cursor.getColumnIndexOrThrow("name"));
String price =
cursor.getString(cursor.getColumnIndexOrThrow("price"));
System.out.println("hello2");
//Get References to the TextViews
nameText = (TextView) findViewById(R.id.txtTitles);
priceText = (TextView) findViewById(R.id.txtPrices);
System.out.println("hello3");
// Update the parent class's TextView
nameText.setText(name);
priceText.setText(price);
System.out.println("hello4");
searchView.setQuery("", true);
}
});
}
}
}