Android Open Source - spring-android-samples Google Search Jackson 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.
 */*w w  w  .  ja 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.Collections;
import java.util.List;

import org.springframework.android.showcase.AbstractAsyncListActivity;
import org.springframework.http.MediaType;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;

/**
 * @author Roy Clarkson
 */
public class GoogleSearchJacksonActivity extends AbstractAsyncListActivity {

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

  private List<GoogleSearchResult> results;

  // ***************************************
  // 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 GoogleSearchTask().execute();
  }

  // ***************************************
  // ListActivity methods
  // ***************************************
  @Override
  protected void onListItemClick(android.widget.ListView l, android.view.View v, int position, long id) {
    if (this.results == null) {
      return;
    }

    GoogleSearchResult result = this.results.get(position);
    startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(result.getUrl())));
  }

  // ***************************************
  // Private methods
  // ***************************************
  private void refreshResults(GoogleSearchResponse response) {
    if (response == null) {
      return;
    }

    this.results = response.getResponseData().getResults();
    setListAdapter(new GoogleSearchResultListAdapter(this, this.results));
  }

  // ***************************************
  // Private classes
  // ***************************************
  private class GoogleSearchTask extends AsyncTask<Void, Void, GoogleSearchResponse> {

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

    @Override
    protected GoogleSearchResponse doInBackground(Void... params) {
      try {
        // The URL for making the GET request
        final String url = "https://ajax.googleapis.com/ajax/services/search/web?v=1.0&q={query}";

        // Create a new RestTemplate instance
        RestTemplate restTemplate = new RestTemplate();

        // Set a custom MappingJacksonHttpMessageConverter that supports the text/javascript media type
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        messageConverter.setSupportedMediaTypes(Collections.singletonList(new MediaType("text", "javascript")));
        restTemplate.getMessageConverters().add(messageConverter);

        // Perform the HTTP GET request to the Google search API
        GoogleSearchResponse response = restTemplate.getForObject(url, GoogleSearchResponse.class, "GoPivotal");

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

      return null;
    }

    @Override
    protected void onPostExecute(GoogleSearchResponse response) {
      dismissProgressDialog();
      refreshResults(response);
    }

  }

}
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