Question

in my android app I’m using an own java library that extracts a .db-file from jar. In Java desktop it works well, but when I try to do it on android, the inputstream blocks forever. The copy method looks like this:

InputStream in = classloader.getResourceAsStream(...);
OutputStream out = new FileOutputStream(new File(...));
try {
  while ((read = in.read()) != -1) {
    out.write(read);
  }
} finally {
  try {
    in.close();
  } catch (final Exception e) {
    LOGGER.debug("Error", e);
  }

  try {
    out.close();
  } catch (final Exception e) {
    LOGGER.debug("Error", e);
  }
}

I want to copy this file to the external files dir and android.permission.WRITE_EXTERNAL_STORAGE is granted.

Is there a way to access the file in /data/app/...apk? If not, how can I detect that it can not be accessed without blocking forever?

Answer 1

You should put the database-file in the /assets-folder and copy it to the /databases-folder on first run. A tutorial on this can be found here.

However, if you only want to create the tables and some sample-entry’s, you might want to use the onCreate()-method from the SQLiteOpenHelper to do so.