Android Open Source - ean-android Image Fetcher

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Copyright (c) 2013, Expedia Affiliate Network All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that redistributions of sour...

Java Source Code

/*
 * Copyright (c) 2013, Expedia Affiliate Network
 * All rights reserved.//from  www  .j  a  va2  s .  c o  m
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that redistributions of source code
 * retain the above copyright notice, these conditions, and the following
 * disclaimer. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those
 * of the authors and should not be interpreted as representing official policies, 
 * either expressed or implied, of the Expedia Affiliate Network or Expedia Inc.
 */

package com.ean.mobile.app;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.os.Build;
import android.widget.ImageView;

import com.ean.mobile.hotel.HotelImageTuple;
import com.ean.mobile.task.ImageDrawableLoaderTask;

/**
 * Uses methods described <a href="http://android-developers.blogspot.com/2011/09/androids-http-clients.html">here</a>
 * to fetch the binary information for images.
 */
public final class ImageFetcher {

    /**
     * Private no-op constructor to prevent instantiation.
     */
    private ImageFetcher() {
        // see javadoc
    }

    /**
     * Gets an input stream from the urlString. Throws an exception if the URL is invalid or
     * some other http exception has happened.
     * @param url The url of the image.
     * @param fullURL Whether or not {#urlString} is the full url or just the path portion (minus host/protocol)
     * @return The input stream pointing to the image requested.
     * @throws IOException If an error occurred when connecting or transmitting the data from urlString.
     */
    public static InputStream fetch(final URL url, final boolean fullURL) throws IOException {
        if (url == null) {
            return null;
        }

        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD) {
            final HttpClient httpClient = new DefaultHttpClient();
            final HttpGet request = new HttpGet(url.toString());
            final HttpResponse response = httpClient.execute(request);
            return response.getEntity().getContent();
        } else {
            final URLConnection connection = url.openConnection();
            return connection.getInputStream();

        }
    }

    /**
     * Gets an input stream from the url. Throws an exception if the URL is invalid or
     * some other http exception has happened.
     * @param url The url of the image. Must be fully qualified.
     * @return The input stream pointing to the image requested.
     * @throws IOException If an error occurred when connecting or transmitting the data from urlString.
     */
    public static InputStream fetch(final URL url) throws IOException {
        return fetch(url, true);
    }

    /**
     * Loads a thumbnail image from a {@link HotelImageDrawable} into the passed ImageView automatically.
     * This method is safe to run on the main thread since it will automatically start an {@link android.os.AsyncTask}
     * ({@link ImageDrawableLoaderTask} to be exact) to load the image if it hasn't already been downloaded.
     * @param thumb The drawable into which to load the image.
     * @param tuple The tuple holding the thumbnail intended to be loaded into thumb.
     */
    public static void loadThumbnailIntoImageView(final ImageView thumb, final HotelImageTuple tuple) {
        final HotelImageDrawable hotelImageDrawable = SampleApp.IMAGE_DRAWABLES.get(tuple);
        if (tuple.thumbnailUrl != null) {
            if (hotelImageDrawable.isThumbnailLoaded()) {
                thumb.setImageDrawable(hotelImageDrawable.getThumbnailImage());
            } else {
                new ImageDrawableLoaderTask(thumb, false).execute(hotelImageDrawable);
            }
        }
    }

}

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