Просто используйте:
SQLiteDatabase.openDatabase(DB_FULL_PATH, null, SQLiteDatabase.OPEN_READONLY);
где DB_FULL_PATH может быть путем к вашей SD-карте, например /sdcard/mydatabase.db
Редактировать:
Это то, что я называю в своем приложении для доступа к базе данных ....
private static DBUtil dbHelper = null;
public void openDatabase() {
if(dbHelper == null) {
dbHelper = new DBUtil(this.context);
dbHelper.openDataBase(SQLiteDatabase.OPEN_READWRITE);
}
}
public void closeDatabase() {
if(dbHelper != null) {
dbHelper.close();
dbHelper = null;
}
}
... и это используемый мной вспомогательный класс db, который фактически расширяет SQLiteOpenHelper, так что у вас все равно будет все, что вы хотите от этого класса.
package com.myapp.android.db;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import com.myapp.android.MyApp;
import java.io.IOException;
/**
* Standard database utility class.
*
* TODO: Refactor.
*/
public class DBUtil extends SQLiteOpenHelper {
/**
* Database directory.
*
* <p>
* Example: "/sdcard/myapp/db/"
* </p>
*/
public static String DB_DIRECTORY = null;
/**
* Name of the database file.
*
* <p>
* Example: "mydatabase.db"
* </p>
*
*/
public static String DB_NAME = null;
/**
* Full absolute path of the database.
*
* <p>
* Example: "/sdcard/myapp/db/mydatabase.db"
* </p>
*/
public static String DB_FULL_PATH = null;
static {
DB_DIRECTORY = MyApp.DATA_REPOSITORY_URI + "/myapp/db/";
DB_NAME = "mydatabase.db";
DB_FULL_PATH = DB_DIRECTORY + DB_NAME;
}
private SQLiteDatabase myDataBase;
/**
* Constructor Takes and keeps a reference of the passed context in order to
* access to the application assets and resources.
*
* @param context
*/
public DBUtil(Context context) {
super(context, DB_NAME, null, 1);
try {
this.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
}
/**
* Creates a empty database on the system and rewrites it with your own
* database.
* */
public void createDataBase() throws IOException {
if (!checkDataBase()) this.getWritableDatabase();
}
/**
* Check if the database already exist to avoid re-copying the file each
* time you open the application.
*
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
checkDB = SQLiteDatabase.openDatabase(DB_FULL_PATH, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
// database does't exist yet.
}
if (checkDB != null) {
checkDB.close();
}
return checkDB != null ? true : false;
}
public void openDataBase(int mode) throws SQLException {
try {
myDataBase = SQLiteDatabase.openDatabase(DB_FULL_PATH, null, mode);
} catch(IllegalStateException e) {
// Sometimes, esp. after application upgrade, the database will be non-closed, raising a IllegalStateException
// below. Try to avoid by simply opening it again.
Log.d(MyApp.APP, "Database non-closed. Reopening.");
myDataBase = SQLiteDatabase.openDatabase(DB_FULL_PATH, null, mode);
}
}
public void openDataBase() throws SQLException {
openDataBase(SQLiteDatabase.OPEN_READWRITE);
}
public SQLiteDatabase getDb() {
return myDataBase;
}
@Override
public synchronized void close() {
if (myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}