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added image manager and updated readme accordingly
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,10 @@ | ||
| package com.tinymission.rss; | ||
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| /** Describes the source of the feed item images. | ||
| */ | ||
| public enum FeedImageSource { | ||
| None, | ||
| Media | ||
| }; | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,195 @@ | ||
| package com.tinymission.rss; | ||
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| import java.io.*; | ||
| import java.util.HashMap; | ||
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| import org.apache.http.*; | ||
| import org.apache.http.client.methods.HttpGet; | ||
| import org.apache.http.impl.client.DefaultHttpClient; | ||
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| import android.graphics.*; | ||
| import android.os.AsyncTask; | ||
| import android.util.Log; | ||
| import android.widget.*; | ||
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| /** Retrieves and stores images for the feed. | ||
| * | ||
| */ | ||
| public class ImageManager { | ||
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| public static final String LOG_TAG = "ImageManager"; | ||
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| private HashMap<String, Bitmap> _bitmapCache; | ||
| private HashMap<Integer, DownloaderTask> _tasks; | ||
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| public ImageManager() { | ||
| _bitmapCache = new HashMap<String, Bitmap>(); | ||
| _tasks = new HashMap<Integer, ImageManager.DownloaderTask>(); | ||
| } | ||
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| public void download(String url, ImageView imageView) { | ||
| // cancel any existing downloads | ||
| cancelDownloaderTask(imageView); | ||
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| // try the cache first | ||
| if (tryLoadCachedBitmap(url, imageView)) | ||
| return; | ||
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| // download the image | ||
| DownloaderTask task = new DownloaderTask(imageView); | ||
| task.execute(url); | ||
| _tasks.put(imageView.getId(), task); | ||
| } | ||
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| private DownloaderTask getDownloaderTask(ImageView imageView) { | ||
| return _tasks.get(imageView.getId()); | ||
| } | ||
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| private void cancelDownloaderTask(ImageView imageView) { | ||
| if (_tasks.containsKey(imageView.getId())) { | ||
| DownloaderTask task = _tasks.get(imageView.getId()); | ||
| task.cancel(true); | ||
| } | ||
| } | ||
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| private void removeDownloaderTask(ImageView imageView) { | ||
| _tasks.remove(imageView.getId()); | ||
| } | ||
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| private Bitmap downloadBitmap(String url) { | ||
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| // AndroidHttpClient is not allowed to be used from the main thread | ||
| final DefaultHttpClient client = new DefaultHttpClient(); | ||
| final HttpGet getRequest = new HttpGet(url); | ||
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| try { | ||
| HttpResponse response = client.execute(getRequest); | ||
| final int statusCode = response.getStatusLine().getStatusCode(); | ||
| if (statusCode != HttpStatus.SC_OK) { | ||
| Log.w("ImageDownloader", "Error " + statusCode + | ||
| " while retrieving bitmap from " + url); | ||
| return null; | ||
| } | ||
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| final HttpEntity entity = response.getEntity(); | ||
| if (entity != null) { | ||
| InputStream inputStream = null; | ||
| try { | ||
| inputStream = entity.getContent(); | ||
| // return BitmapFactory.decodeStream(inputStream); | ||
| // Bug on slow connections, fixed in future release. | ||
| return BitmapFactory.decodeStream(new FlushedInputStream(inputStream)); | ||
| } finally { | ||
| if (inputStream != null) { | ||
| inputStream.close(); | ||
| } | ||
| entity.consumeContent(); | ||
| } | ||
| } | ||
| } catch (IOException e) { | ||
| getRequest.abort(); | ||
| Log.w(LOG_TAG, "I/O error while retrieving bitmap from " + url, e); | ||
| } catch (IllegalStateException e) { | ||
| getRequest.abort(); | ||
| Log.w(LOG_TAG, "Incorrect URL: " + url); | ||
| } catch (Exception e) { | ||
| getRequest.abort(); | ||
| Log.w(LOG_TAG, "Error while retrieving bitmap from " + url, e); | ||
| } finally { | ||
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| } | ||
| return null; | ||
| } | ||
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| /* | ||
| * An InputStream that skips the exact number of bytes provided, unless it reaches EOF. | ||
| */ | ||
| static class FlushedInputStream extends FilterInputStream { | ||
| public FlushedInputStream(InputStream inputStream) { | ||
| super(inputStream); | ||
| } | ||
| @Override | ||
| public long skip(long n) throws IOException { | ||
| long totalBytesSkipped = 0L; | ||
| while (totalBytesSkipped < n) { | ||
| long bytesSkipped = in.skip(n - totalBytesSkipped); | ||
| if (bytesSkipped == 0L) { | ||
| int b = read(); | ||
| if (b < 0) { | ||
| break; // we reached EOF | ||
| } else { | ||
| bytesSkipped = 1; // we read one byte | ||
| } | ||
| } | ||
| totalBytesSkipped += bytesSkipped; | ||
| } | ||
| return totalBytesSkipped; | ||
| } | ||
| } | ||
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| /** Tries to load a bitmap associated with the given url from the cache into the image view. | ||
| * @param url the url of the image | ||
| * @param imageView the ImageView to load the image into | ||
| * @return true if the bitmap was found in the cache | ||
| */ | ||
| public boolean tryLoadCachedBitmap(String url, ImageView imageView) { | ||
| if (_bitmapCache.containsKey(url)) { | ||
| imageView.setImageBitmap(_bitmapCache.get(url)); | ||
| Log.v(LOG_TAG, "Loaded cached bitmap for url: " + url); | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
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| /** Adds the given bitmap to the cache associated with the url. | ||
| * @param url | ||
| * @param bitmap | ||
| */ | ||
| public void addBitmapToCache(String url, Bitmap bitmap) { | ||
| _bitmapCache.put(url, bitmap); | ||
| } | ||
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| /** | ||
| * The actual AsyncTask that will asynchronously download the image. | ||
| */ | ||
| class DownloaderTask extends AsyncTask<String, Void, Bitmap> { | ||
| private String url; | ||
| private final ImageView _imageView; | ||
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| public DownloaderTask(ImageView imageView) { | ||
| _imageView = imageView; | ||
| } | ||
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| /** | ||
| * Actual download method. | ||
| */ | ||
| @Override | ||
| protected Bitmap doInBackground(String... params) { | ||
| url = params[0]; | ||
| return downloadBitmap(url); | ||
| } | ||
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| /** | ||
| * Once the image is downloaded, associates it to the imageView | ||
| */ | ||
| @Override | ||
| protected void onPostExecute(Bitmap bitmap) { | ||
| addBitmapToCache(url, bitmap); | ||
| if (_imageView != null) { | ||
| DownloaderTask bitmapDownloaderTask = getDownloaderTask(_imageView); | ||
| // Change bitmap only if this process is still associated with it | ||
| if (this == bitmapDownloaderTask) { | ||
| _imageView.setImageBitmap(bitmap); | ||
| removeDownloaderTask(_imageView); | ||
| Log.v(LOG_TAG, "Downloaded bitmap for url: " + url); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| } |