Android Open Source - spring-android-samples Http Get Gzip Uncompressed 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   ww w . jav  a 2  s. co  m
 * 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 org.springframework.android.showcase.AbstractAsyncActivity;
import org.springframework.android.showcase.R;
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.StringHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

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

/**
 * @author Roy Clarkson
 */
public class HttpGetGzipUncompressedActivity extends AbstractAsyncActivity {

  private static final String TAG = HttpGetGzipUncompressedActivity.class.getSimpleName();

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

  @Override
  public void onStart() {
    super.onStart();
    new UncompressedRequestTask().execute();
  }

  // ***************************************
  // Private methods
  // ***************************************
  private void refreshResults(ResponseEntity<String> response) {
    if (response == null) {
      return;
    }

    HttpHeaders headers = response.getHeaders();
    StringBuilder sb = new StringBuilder();
    sb.append("Date: ").append(headers.getFirst("Date")).append("\n");
    sb.append("Status: ").append(headers.getFirst("Status")).append("\n");
    sb.append("Content-Type: ").append(headers.getFirst("Content-Type")).append("\n");
    sb.append("Content-Encoding: ").append(headers.getFirst("Content-Encoding")).append("\n");
    sb.append("Content-Length: ").append(headers.getFirst("Content-Length")).append("\n");

    TextView textView = (TextView) findViewById(R.id.text_view_headers);
    textView.setText(sb.toString());

    String results = response.getBody() + "\n";

    textView = (TextView) findViewById(R.id.text_view_results);
    textView.setText(results);
  }

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

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

    @Override
    protected ResponseEntity<String> doInBackground(Void... params) {
      try {
        // The URL for making the GET request
        final String url = "http://search.twitter.com/search.json?q={query}&rpp=100";

        // Add the Identity Accept-Encoding header to the request
        // This disables gzip compression in Gingerbread (2.3) and newer
        HttpHeaders requestHeaders = new HttpHeaders();
        requestHeaders.setAcceptEncoding(ContentCodingType.IDENTITY);

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

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

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

      return null;
    }

    @Override
    protected void onPostExecute(ResponseEntity<String> response) {
      dismissProgressDialog();
      refreshResults(response);
    }

  }

}

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