Android Open Source - spring-android-samples Twitter Search Results Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2010-2014 the original author or authors.
 */*from www.  j a v  a 2s .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.twittersearch;

import java.util.List;

import org.springframework.http.ContentCodingType;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.json.MappingJacksonHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import android.app.ListActivity;
import android.app.ProgressDialog;
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 TwitterSearchResultsActivity extends ListActivity {

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

  private ProgressDialog progressDialog;

  private boolean destroyed = false;

  private List<Tweet> tweets;

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

  @Override
  public void onStart() {
    super.onStart();
    String searchValue = getIntent().getStringExtra(
        "org.springframework.android.showcase.TwitterSearchResultsActivity.search");
    Log.d(TAG, searchValue);
    new TwitterSearchTask().execute(searchValue);
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    destroyed = true;
  }

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

    Tweet tweet = tweets.get(position);
    startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(tweet.getUrl())));
  }

  // ***************************************
  // Private methods
  // ***************************************
  private void showLoadingProgressDialog() {
    this.showProgressDialog("Searching Twitter...");
  }

  private void showProgressDialog(CharSequence message) {
    if (this.progressDialog == null) {
      this.progressDialog = new ProgressDialog(this);
      this.progressDialog.setIndeterminate(true);
    }

    this.progressDialog.setMessage(message);
    this.progressDialog.show();
  }

  private void dismissProgressDialog() {
    if (this.progressDialog != null && !destroyed) {
      this.progressDialog.dismiss();
    }
  }

  private void refreshResults(ResponseEntity<TwitterSearchResults> response) {
    if (response == null) {
      return;
    }

    TwitterSearchResults results = response.getBody();
    setListAdapter(new TweetListAdapter(this, results.getResults()));
  }

  // ***************************************
  // Private classes
  // ***************************************
  private class TwitterSearchTask extends AsyncTask<String, Void, ResponseEntity<TwitterSearchResults>> {

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

    @Override
    protected ResponseEntity<TwitterSearchResults> doInBackground(String... params) {
      try {
        // The URL for making the GET request
        final String url = "http://search.twitter.com/search.json?q={query}&rpp=20";

        // Add the gzip Accept-Encoding header to the request. This is not needed for Gingerbread and newer versions of Android
        HttpHeaders requestHeaders = new HttpHeaders();
        requestHeaders.setAcceptEncoding(ContentCodingType.GZIP);

        // Create a new RestTemplate instance
        RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new MappingJacksonHttpMessageConverter());

        // Retrieve the parameter passed into the async task
        String searchValue = params[0];

        // Perform the HTTP GET request
        ResponseEntity<TwitterSearchResults> response = restTemplate.exchange(url, HttpMethod.GET,
            new HttpEntity<Object>(requestHeaders), TwitterSearchResults.class, searchValue);

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

      return null;
    }

    @Override
    protected void onPostExecute(ResponseEntity<TwitterSearchResults> result) {
      dismissProgressDialog();
      refreshResults(result);
    }

  }

}

Java Source Code List

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