<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

public void sqliteExport(String dbName, String exportFileName) {

        try {
            File data = Environment.getDataDirectory();
            File sd = Environment.getExternalStorageDirectory();

            Log.e(TAG, "getDataDirectory:  - " + data.toString());
            Log.e(TAG, "getExternalStorageDirectory:  - " + sd.toString());

            if (sd.canWrite()) {
                String currentDBPath = "/data/pakagename/databases/" + dbName;
                String backupDBPath = "/app_name/data/files/" + exportFileName;
                File currentDB = new File(data, currentDBPath);
                File backupDB = new File(sd, backupDBPath);

                if (currentDB.exists()) {
                    FileChannel src = new FileInputStream(currentDB).getChannel();
                    FileChannel dst = new FileOutputStream(backupDB).getChannel();
                    dst.transferFrom(src, 0, src.size());
                    src.close();
                    dst.close();
                }
                if (backupDB.exists()) {
                    //Toast.makeText(this, "DB Export Complete!!", Toast.LENGTH_SHORT).show();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }