Opening a database from external storage Android

I was previously storing a sqlite database in my apps assets folder but have now moved the database to external storage.

My previous copyDatabase() method looked like this.

private void copyDataBase() throws IOException {
        InputStream myInput = myContext.getAssets().open(DATABASE_NAME);
        OutputStream myOutput = new FileOutputStream(DB_PATH);
        byte[] buffer = new byte[AccessibilityNodeInfoCompat.ACTION_NEXT_HTML_ELEMENT];
        while (true) {
            int length = myInput.read(buffer);
            if (length > 0) {
                myOutput.write(buffer, 0, length);
            } else {
                myOutput.flush();
                myOutput.close();
                myInput.close();
                return;
            }
        }
    }

The issue is I'm unsure how to create an InputStream for opening the database from external storage. I can't seem to find the external storage equivalent to myContext.getAssets().open(DATABASE_NAME);

The current database path:

DB_PATH = Environment.getExternalStorageDirectory().getPath().toString()+"/SoulInfoDatabase/BB2SoulDatabase.db";