Thanks a lot Nick Parker ,actually i used a code snippet from your sample and i created a new class representing SqlCipherAssestHelper that copy the encrypted DataBase from assets to another location in the device and read/write from the new copy using the database in the sample "1x.db" here
this is the Helper Calss:
package com.example.readdbfromas;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import net.sqlcipher.SQLException;
import net.sqlcipher.database.SQLiteDatabase;
import net.sqlcipher.database.SQLiteDatabaseHook;
import net.sqlcipher.database.SQLiteException;
import net.sqlcipher.database.SQLiteOpenHelper;
import android.content.Context;
import android.os.Environment;
import android.util.Log;
public class DataBaseHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "1x.db";// Encrypted Database
private static final String SUB_DATABASE_FOLDER = "/DatabaseCipher/";// a sub folder for database location
public static String DATABASE_PATH;
public static final int DATABASE_VERSION = 1;
private SQLiteDatabase myDataBase;
private final Context context;
private String password = "";
private String FULL_DB_Path;
public DataBaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
DATABASE_PATH = Environment.getExternalStorageDirectory()
.getAbsolutePath().toString()
+ SUB_DATABASE_FOLDER;//get the device root Directory to copy data base on it
this.context = context;
SQLiteDatabase.loadLibs(context.getApplicationContext());//load SqlCipher libraries
FULL_DB_Path = DATABASE_PATH + DATABASE_NAME;//full database path
}
public SQLiteDatabase open(String password) {
this.password = password;
if (!checkDataBase()) {// if Database Not Exist
copyDataBase();
}
myDataBase = getExistDataBaseFile();
return myDataBase;
}
private SQLiteDatabase getExistDataBaseFile() {// this function to open an Exist database
SQLiteDatabaseHook hook = new SQLiteDatabaseHook() {
public void preKey(SQLiteDatabase database) {
}
public void postKey(SQLiteDatabase database) {
database.rawExecSQL("PRAGMA cipher_migrate;");
}
};
return SQLiteDatabase.openOrCreateDatabase(FULL_DB_Path, password,
null, hook);
}
private boolean checkDataBase() {// Check database file is already exist or not
boolean checkDB = false;
try {
File dbfile = new File(FULL_DB_Path);
checkDB = dbfile.exists();
} catch (SQLiteException e) {
}
return checkDB;
}
public void db_delete() {// delete database
File file = new File(FULL_DB_Path);
if (file.exists()) {
file.delete();
System.out.println("delete database file.");
}
}
private void copyDataBase() {//make a sub folder for database location and copy the database
try {
File fofo = new File(DATABASE_PATH);
fofo.mkdirs();
extractAssetToDatabaseDirectory(DATABASE_NAME);
} catch (IOException e) {
e.printStackTrace();
}
}
public synchronized void closeDataBase() throws SQLException {
if (myDataBase != null)
myDataBase.close();
super.close();
}
public void extractAssetToDatabaseDirectory(String fileName)
throws IOException {// copy the database
int length;
InputStream sourceDatabase = context.getAssets().open(fileName);
File destinationPath = new File(FULL_DB_Path);
OutputStream destination = new FileOutputStream(destinationPath);
byte[] buffer = new byte[4096];
while ((length = sourceDatabase.read(buffer)) > 0) {
destination.write(buffer, 0, length);
}
sourceDatabase.close();
destination.flush();
destination.close();
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void onCreate(SQLiteDatabase db) {
}
public boolean changePassword(String newPassword) {// DataBase must be
// opened before
// changing Password
try {
if (myDataBase != null && myDataBase.isOpen()) {
myDataBase.rawExecSQL("BEGIN IMMEDIATE TRANSACTION;");
myDataBase.rawExecSQL("PRAGMA rekey = '" + newPassword + "';");
this.close();
myDataBase.close();
return true;
} else {
Log.e("boolean changePassword()",
"Change Password Error : DataBase is null or not opened !!");
return false;
}
} catch (Exception e) {
Log.e("boolean changePassword()",
"Change Password Error :ExecSQL Error !!");
return false;
}
}
}
and this code inside activity :
SQLiteDatabase db;
DataBaseHelper myDbHelper = new DataBaseHelper(MainActivity.this);
db=myDbHelper.open("test");
Cursor cursor=db.rawQuery("select * from t1", null);