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

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Here is the source code for com.applechip.android.showcase.rest.HttpGetGzipCompressedJsonActivity.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 com.applechip.android.showcase.AbstractAsyncActivity;
import com.applechip.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.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;

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

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

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

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

    // ***************************************
    // Private methods
    // ***************************************
    private void refreshResults(ResponseEntity<TwitterSearchResults> 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());

        TwitterSearchResults results = response.getBody();

        ListView listView = (ListView) findViewById(R.id.list_view_result_items);
        listView.setAdapter(new TweetListAdapter(this, results.getResults()));
    }

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

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

        @Override
        protected ResponseEntity<TwitterSearchResults> 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 gzip Accept-Encoding header to the request
                HttpHeaders requestHeaders = new HttpHeaders();
                requestHeaders.setAcceptEncoding(ContentCodingType.GZIP);

                // Create a new RestTemplate instance
                RestTemplate restTemplate = new RestTemplate();
                restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());

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

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

            return null;
        }

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

    }

}