com.applechip.android.showcase.rest.HttpGetParametersActivity.java Source code

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Here is the source code for com.applechip.android.showcase.rest.HttpGetParametersActivity.java

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/*
 * Copyright 2010-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.applechip.android.showcase.rest;

import java.util.ArrayList;
import java.util.List;

import com.applechip.android.showcase.AbstractAsyncActivity;
import com.applechip.android.showcase.R;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.xml.SimpleXmlHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
 * @author Roy Clarkson
 * @author Helena Edelson
 * @author Pierre-Yves Ricau
 */
public class HttpGetParametersActivity extends AbstractAsyncActivity {

    protected static final String TAG = HttpGetParametersActivity.class.getSimpleName();

    // ***************************************
    // Activity methods
    // ***************************************
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.http_get_parameters_activity_layout);

        // Initiate the request for JSON data when the JSON button is pushed
        final Button buttonJson = (Button) findViewById(R.id.button_json);
        buttonJson.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                new DownloadStateTask().execute(MediaType.APPLICATION_JSON);
            }
        });

        // Initiate the request for XML data when the XML button is pushed
        final Button buttonXml = (Button) findViewById(R.id.button_xml);
        buttonXml.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                new DownloadStateTask().execute(MediaType.APPLICATION_XML);
            }
        });
    }

    // ***************************************
    // Private methods
    // ***************************************
    private void showState(State state) {
        // display a notification to the user with the state
        if (state != null) {
            Toast.makeText(this, state.getFormattedName(), Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(this, "No state found with that abbreviation!", Toast.LENGTH_LONG).show();
        }
    }

    // ***************************************
    // Private classes
    // ***************************************
    private class DownloadStateTask extends AsyncTask<MediaType, Void, State> {

        private String abbreviation;

        @Override
        protected void onPreExecute() {
            showLoadingProgressDialog();

            // retrieve the abbreviation from the EditText field
            EditText editText = (EditText) findViewById(R.id.edit_text_abbreviation);

            abbreviation = editText.getText().toString();
        }

        @Override
        protected State doInBackground(MediaType... params) {
            try {
                if (params.length <= 0) {
                    return null;
                }

                MediaType mediaType = params[0];

                // The URL for making the GET request
                final String url = getString(R.string.base_uri) + "/state/{abbreviation}";

                // Set the Accept header for "application/json" or "application/xml"
                HttpHeaders requestHeaders = new HttpHeaders();
                List<MediaType> acceptableMediaTypes = new ArrayList<MediaType>();
                acceptableMediaTypes.add(mediaType);
                requestHeaders.setAccept(acceptableMediaTypes);

                // Populate the headers in an HttpEntity object to use for the request
                HttpEntity<?> requestEntity = new HttpEntity<Object>(requestHeaders);

                // Create a new RestTemplate instance
                RestTemplate restTemplate = new RestTemplate();
                if (mediaType.equals(MediaType.APPLICATION_JSON)) {
                    restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
                } else if (mediaType.equals(MediaType.APPLICATION_XML)) {
                    restTemplate.getMessageConverters().add(new SimpleXmlHttpMessageConverter());
                }

                // Perform the HTTP GET request
                ResponseEntity<State> responseEntity = restTemplate.exchange(url, HttpMethod.GET, requestEntity,
                        State.class, abbreviation);

                // Return the state from the ResponseEntity
                return responseEntity.getBody();
            } catch (Exception e) {
                Log.e(TAG, e.getMessage(), e);
            }

            return null;
        }

        @Override
        protected void onPostExecute(State state) {
            dismissProgressDialog();
            showState(state);
        }

    }

}