问新java.io.IOException :调用需要API级别9

EN

public static boolean loginValide(final String username, final String password) throws IOException {
    final boolean valide = false;
    final String postData = "somePostParameters";
    URL url;
    HttpsURLConnection connexion;

    url = new URL("someUrl");
    connexion = (HttpsURLConnection) url.openConnection();
    try {
        connexion.setDoOutput(true);

        final DataOutputStream dos = new DataOutputStream(connexion.getOutputStream());
        dos.writeBytes(postData);
        dos.flush();
        dos.close();

        final int responseCode = connexion.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_ACCEPTED) {
            // ...
        }
        else {
            // ...
        }
    } catch (final IOException e) {
        throw new IOException(e); /* I am retrowing an exception so the
        finally block is still called */
    }
    finally {
        connexion.disconnect(); // Close the connection
    }

    return valide;
}

Call requires API level 9 (current min is 8): new java.io.IOException