Issues comparing the result of an HttResponse in android

public class HttpTest extends Activity {

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    DownloadWebPageTask task = new DownloadWebPageTask();
    task.execute(new String[] { "http://www.ecoeficiencia-ambiental.com/test/" });
}
private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
    protected String doInBackground(String... urls) {
        String response = "";
        for (String url : urls) {
            DefaultHttpClient client = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url);
            try {
                HttpResponse execute = client.execute(httpGet);
                InputStream content = execute.getEntity().getContent();
                BufferedReader buffer = new BufferedReader(new InputStreamReader(content));
                String s = "";
                while ((s = buffer.readLine开发者_开发知识库()) != null) {
                    response += s;
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return response;
    }
    protected void onPostExecute(String result) {
        if(result == "ok"){
            Toast.makeText(HttpTest.this, result, Toast.LENGTH_LONG).show();
        }else{
            Toast.makeText(HttpTest.this, "the conditional fails, the result is: "+result, Toast.LENGTH_LONG).show();
        }
    }
}