SQLite anschließen /FileNotFound

package com.example.myapp;
public class Helper extends SQLiteOpenHelper {
private static String path = "/data/data/com.example.myapp/databases/";
private static String db = "nn"; private static String dbpath = path + db;
private SQLiteDatabase myDB;
private Context con;

public Helper(Context context) {
super(context, db, null, 1); this.con = context;
}

public Context getContext(){
return this.con; }

public void createDataBase() throws IOException{

if(!checkDataBase()){
this.getReadableDatabase();
try {
copyDataBase(); }
catch (IOException e) {
System.out.println("no Database");
}
}
}

private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try{
checkDB = SQLiteDatabase.openDatabase(dbpath, null, SQLiteDatabase.OPEN_READONLY); }
catch(SQLiteException e){ }
if(checkDB != null){
checkDB.close(); return true; }
else {return false;} }

private void copyDataBase() throws IOException {
InputStream myInput = con.getAssets().open(db);
OutputStream myOutput = new FileOutputStream(dbpath);
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close(); }


public void openDataBase() throws SQLException{
myDB = SQLiteDatabase.openDatabase(dbpath, null, SQLiteDatabase.OPEN_READONLY); }

@Override
public synchronized void close() {
if(myDB != null) myDB.close(); super.close(); }

@Override
public void onCreate(SQLiteDatabase arg0) {
// TODO Auto-generated method stub }

@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub }


}

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