Android Open Source - spring-android-samples Http Get Xml Activity

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright 2010-2014 the original author or authors.
 *//from w w  w . j a  v a2  s .  c om
 * 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 org.springframework.android.showcase.rest;

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

import org.springframework.android.showcase.AbstractAsyncListActivity;
import org.springframework.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.xml.SimpleXmlHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;

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

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

  // ***************************************
  // Activity methods
  // ***************************************
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
  }

  @Override
  public void onStart() {
    super.onStart();

    // when this activity starts, initiate an asynchronous HTTP GET request
    new DownloadStatesTask().execute();
  }

  // ***************************************
  // Private methods
  // ***************************************
  private void refreshStates(List<State> states) {
    if (states == null) {
      return;
    }

    StatesListAdapter adapter = new StatesListAdapter(this, states);
    setListAdapter(adapter);
  }

  // ***************************************
  // Private classes
  // ***************************************
  private class DownloadStatesTask extends AsyncTask<Void, Void, List<State>> {

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

    @Override
    protected List<State> doInBackground(Void... params) {
      try {
        // The URL for making the GET request
        final String url = getString(R.string.base_uri) + "/states";

        // Set the Accept header for "application/xml"
        HttpHeaders requestHeaders = new HttpHeaders();
        List<MediaType> acceptableMediaTypes = new ArrayList<MediaType>();
        acceptableMediaTypes.add(MediaType.APPLICATION_XML);
        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();
        restTemplate.getMessageConverters().add(new SimpleXmlHttpMessageConverter());

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

        // Return the list of states
        StateList stateList = responseEntity.getBody();

        return stateList.getStates();
      } catch (Exception e) {
        Log.e(TAG, e.getMessage(), e);
      }

      return null;
    }

    @Override
    protected void onPostExecute(List<State> result) {
      dismissProgressDialog();
      refreshStates(result);
    }

  }

}
Java Source Code List
