What should I use on platforms pre-Kitkat

Question

I am trying to send a POST to a URL and then read the response.

HttpURLConnection conn = (HttpURLConnection) registerURL.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setInstanceFollowRedirects(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("charset", "utf-8");
conn.setRequestProperty("Content-Length", Integer.toString(postDataLength));
conn.setUseCaches(false);
try (DataOutputStream wr = new DataOutputStream(conn.getOutputStream())) {
    wr.write(postData);
}

In the above, AndroidStudio warns that the line

DataOutputStream wr = new DataOutputStream(conn.getOutputStream())

requires API level 19. In order to avail this to older versions, what alternative could I use? I tried searching via Google, but did not seem to find anything helpful.

Answer 1

Try replacing (try-with-resources with a regular try block);

try (DataOutputStream wr = new DataOutputStream(conn.getOutputStream())) {
    wr.write(postData);
}

with

    DataOutputStream wr = null;

    try {
        wr = new DataOutputStream(conn.getOutputStream());
        wr.write(postData);

    }catch (Exception e){
        e.printStackTrace();
    }finally {
        if(wr != null)
            try {
                wr.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
    }

This should stop AS from showing any more warnings