How to import classes like Httpclient, Defaulthttpclient etc

Question

I implemented these classes, but I can’t import them; the project was done in Android Studio.

public class HttpConnection {

    public static String getSetDataWeb(WrapData wd){
        HttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(wd.getUrl());
        String answer = "";

        try{
            ArrayList<NameValuePair> valores = new ArrayList<NameValuePair>();
            valores.add(new BasicNameValuePair("method", wd.getMethod()));
            valores.add(new BasicNameValuePair("produto", wd.getProduto()));
            valores.add(new BasicNameValuePair("marca", wd.getMarca()));
            valores.add(new BasicNameValuePair("detalhe", wd.getDetalhe()));
            valores.add(new BasicNameValuePair("img-mime", wd.getImage().getMime()));
            valores.add(new BasicNameValuePair("img-image", wd.getImage().getBitmapBase64()));

            httpPost.setEntity(new UrlEncodedFormEntity(valores));
            HttpResponse resposta = httpClient.execute(httpPost);
            answer = EntityUtils.toString(resposta.getEntity());
        }
        catch (UnsupportedEncodingException e) { e.printStackTrace(); }
        catch (ClientProtocolException e) { e.printStackTrace(); }
        catch (IOException e) { e.printStackTrace(); }
        return(answer);
    }

}

Answer 1

It is not recommended to use the class more HttpClient because of some performance issues (compression, cache and battery consumption reduction).

So much so that in version 6, HttpClient is obsolete, as can be seen here. It is still possible to use, but if it is a new application, it is good not to use.

The recommendation is to use either a "third-party" Client such as the OkHttp or the very UrlConnection.

Alas for the OkHttp:

Declaring dependence on your build.gradle:

compile 'com.squareup.okhttp:okhttp:2.5.0'

Using:

OkHttpClient client = new OkHttpClient();

Request request = new Request.Builder()
        .url(URL)
        .build();

Response response = client.newCall(request).execute();

if (response.code() != 200) {
    // ERRO
} else {
    String body = response.body().string();
    // Usar o body retornado pelo servidor...
}

Or Using UrlConnection:

private static String getUrlContents(String theUrl) {
    StringBuilder content = new StringBuilder();

    try {
        URL url = new URL(theUrl);

        URLConnection urlConnection = url.openConnection();

        BufferedReader bufferedReader =
                new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));

        String line;

        while ((line = bufferedReader.readLine()) != null) {
            content.append(line + "\n");
        }

        bufferedReader.close();
    } catch(Exception e) {
        // Eh bom tratar as exceptions :D
        e.printStackTrace();
    }

    return content.toString();
}

String body = getUrlContents(URL);
// Usar o body retornado pelo servidor...

Answer 2

My question was to be able to import the class HttpClient. Actually this class is already obsolete, but as I said, I intended to learn to import it. After some research I found that I should add this to my gradle:

android {
    useLibrary 'org.apache.http.legacy'
}