AsyncTask POST form

SubscribtionController.java

package com.yyz;

import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.AsyncTask;

public class SubscribtionController extends AsyncTask < String, String, String > {

    private HashMap<String, String> mData = null; // post data
    private SubscriptionControllerListener mListener;
    private static final String BASE_URL = "replace-with-yours-here";

    public interface SubscriptionControllerListener {
        void onSuccess(JSONObject jsonResponse);

        void onError(Throwable throwable);
    }

    /**
     * constructor
     */
    public SubscribtionController(HashMap < String, String > data) {
        mData = data;
    }

    public void setHandler(SubscriptionControllerListener listener) {
        mListener = listener;
    }

    /**
     * background
     */
    @Override
    protected String doInBackground(String...params) {
        byte[] result = null;
        String str;
        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(BASE_URL + params[0]); // in this case, params[0]
        // is URL
        try {
            // set up post data
            ArrayList < NameValuePair > nameValuePair = new ArrayList < NameValuePair > ();
            Iterator < String > it = mData.keySet().iterator();
            while (it.hasNext()) {
                String key = it.next();
                nameValuePair.add(new BasicNameValuePair(key, mData.get(key)));
            }

            post.setEntity(new UrlEncodedFormEntity(nameValuePair, "UTF-8"));
            HttpResponse response = client.execute(post);
            StatusLine statusLine = response.getStatusLine();
            if (statusLine.getStatusCode() == HttpURLConnection.HTTP_OK) {
                result = EntityUtils.toByteArray(response.getEntity());
                str = new String(result, "UTF-8");
            }
        } catch (Exception e) {

            mListener.onError(new SubscribtionException(e.getMessage()));
        }
        return str;
    }

    /**
     * on getting result
     */
    @Override
    protected void onPostExecute(String result) {

        if (result != null) {

            try {
                JSONObject response = new JSONObject(result);

                if (response.getString("status").equals("success")) {

                    mListener.onSuccess(response);

                } else {

                    SubscribtionException exception = new SubscribtionException(response.getString("status"));
                    exception.setResponse(response);

                    mListener.onError(exception);
                }

            } catch (Exception e) {

                mListener.onError(new SubscribtionException(e.getMessage()));
            }
        } else {
        
			    mListener.onError(new SubscribtionException());
        }


    }

    public class SubscribtionException extends RuntimeException {

        private JSONObject mResponse = null;

        public SubscribtionException(String msg) {
            super(msg);
        }

        public SubscribtionException() {
            super("Oops, something went wrong");
        }

        public void setResponse(JSONObject response) {
            mResponse = response;
        }

        public JSONObject getResponse() {
            return mResponse;
        }
    }
}
```

example use :

HashMap<String, String> data = new HashMap<String, String>();
data.put("username", "jarjit");
data.put("password", "jarjit");

SubscribtionController api = new SubscribtionController(data);
api.setHandler(new SubscriptionControllerListener() {
	@Override
	public void onSuccess(JSONObject jsonResponse) {
		// TODO Auto-generated method stub
	}
	
        @Override
	public void onError(Throwable throwable) {
		// TODO Auto-generated method stub
	}
});
api.execute("/v1/login");