Google drive How to restore database insert to my local database?

I want to restore my db ,and insert it to my local database

i try this code ,but local database is lost

please help me.

DriveContents content = result.getDriveContents();    
        try {
             java.io.File dir = getApplicationContext().getDatabasePath(DATABASE_NAME);
            BufferedInputStream in = new BufferedInputStream(content.getInputStream());      
            BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dir));


            byte[] buffer = new byte[8 * 1024];
            int n = 0;
            while( ( n = in.read(buffer) ) > 0) {
                out.write(buffer, 0, n);

            }
            out.flush();
            in.close();
            out.close();
           content.discard(mGoogleApiClient);
            showMessage("file done");

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();

        }

    }