Implemented async FeedImage loader

src/de/podfetcher/activity/FeedInfoActivity.java

@@ -10,6 +10,7 @@ import com.actionbarsherlock.view.Menu;
 import com.actionbarsherlock.view.MenuItem;
 
 import de.podfetcher.R;
+import de.podfetcher.asynctask.FeedImageLoader;
 import de.podfetcher.feed.Feed;
 import de.podfetcher.feed.FeedManager;
 
@@ -41,8 +42,8 @@ public class FeedInfoActivity extends SherlockActivity {
 			txtvDescription = (TextView) findViewById(R.id.txtvDescription);
 			txtvLanguage = (TextView) findViewById(R.id.txtvLanguage);
 			txtvAuthor = (TextView) findViewById(R.id.txtvAuthor);
+			FeedImageLoader.getInstance().loadBitmap(feed.getImage(), imgvCover);
 			
-			imgvCover.setImageBitmap(feed.getImage().getImageBitmap());
 			txtvTitle.setText(feed.getTitle());
 			txtvDescription.setText(feed.getDescription());
 			if (feed.getAuthor() != null) {

src/de/podfetcher/activity/FeedItemlistActivity.java

@@ -42,7 +42,6 @@ public class FeedItemlistActivity extends SherlockFragmentActivity {
 		if(feedId == -1) Log.e(TAG, "Received invalid feed selection.");
 
 		feed = manager.getFeed(feedId);
-		getSupportActionBar().setLogo(new BitmapDrawable(feed.getImage().getImageBitmap()));
 		setTitle(feed.getTitle());
 		
 		FragmentManager fragmentManager = getSupportFragmentManager();

src/de/podfetcher/activity/ItemviewActivity.java

@@ -69,8 +69,6 @@ public class ItemviewActivity extends SherlockFragmentActivity {
 	private void populateUI() {
 		getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 		setContentView(R.layout.feeditemview);
-		getSupportActionBar().setLogo(
-				new BitmapDrawable(item.getFeed().getImage().getImageBitmap()));
 		txtvTitle = (TextView) findViewById(R.id.txtvItemname);
 		txtvPublished = (TextView) findViewById(R.id.txtvPublished);
 		setTitle(item.getFeed().getTitle());

src/de/podfetcher/adapter/FeedlistAdapter.java

@@ -5,6 +5,7 @@ import java.text.DateFormat;
 import java.util.List;
 
 import de.podfetcher.R;
+import de.podfetcher.asynctask.FeedImageLoader;
 import de.podfetcher.feed.Feed;
 import de.podfetcher.storage.DownloadRequester;
 import android.content.Context;
@@ -25,12 +26,14 @@ public class FeedlistAdapter extends ArrayAdapter<Feed> {
 	private static final String TAG = "FeedlistAdapter";
 
 	private int selectedItemIndex;
+	private FeedImageLoader imageLoader;
 	public static final int SELECTION_NONE = -1;
 
 	public FeedlistAdapter(Context context, int textViewResourceId,
 			List<Feed> objects) {
 		super(context, textViewResourceId, objects);
 		selectedItemIndex = SELECTION_NONE;
+		imageLoader = FeedImageLoader.getInstance();
 	}
 
 	@Override
@@ -82,16 +85,8 @@ public class FeedlistAdapter extends ArrayAdapter<Feed> {
 			holder.newEpisodes.setVisibility(View.INVISIBLE);
 		}
 
-		if (feed.getImage() != null) {
-			holder.image.setImageBitmap(feed.getImage().getImageBitmap()); // TODO
-																			// select
-																			// default
-																			// picture
-																			// when
-																			// no
-																			// image
-																			// downloaded
-		}
+		imageLoader.loadBitmap(feed.getImage(), holder.image);
+
 		// TODO find new Episodes txtvNewEpisodes.setText(feed)
 		return convertView;
 	}

src/de/podfetcher/asynctask/FeedImageLoader.java

@@ -0,0 +1,101 @@
+package de.podfetcher.asynctask;
+
+import de.podfetcher.R;
+import de.podfetcher.feed.FeedImage;
+import android.annotation.SuppressLint;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.AsyncTask;
+import android.support.v4.util.LruCache;
+import android.util.Log;
+import android.widget.ImageView;
+
+/** Caches and loads FeedImage bitmaps in the background */
+public class FeedImageLoader {
+	private static FeedImageLoader singleton;
+
+	/**
+	 * Stores references to loaded bitmaps. Bitmaps can be accessed by the id of
+	 * the FeedImage the bitmap belongs to.
+	 */
+	private LruCache<Long, Bitmap> imageCache;
+	private static final int CACHE_SIZE = 4 * 1024 * 1024;
+
+	private FeedImageLoader() {
+		imageCache = new LruCache<Long, Bitmap>(CACHE_SIZE) {
+
+			@SuppressLint("NewApi")
+			@Override
+			protected int sizeOf(Long key, Bitmap value) {
+				if (Integer.valueOf(android.os.Build.VERSION.SDK_INT) >= 12)
+					return value.getByteCount();
+				else
+					return (value.getRowBytes() * value.getHeight());
+
+			}
+
+		};
+	}
+
+	public static FeedImageLoader getInstance() {
+		if (singleton == null) {
+			singleton = new FeedImageLoader();
+		}
+		return singleton;
+	}
+
+	public void loadBitmap(FeedImage image, ImageView target) {
+		if (image != null) {
+			Bitmap bitmap = getBitmapFromCache(image.getId());
+			if (bitmap != null) {
+				target.setImageBitmap(bitmap);
+			} else {
+				target.setImageResource(R.drawable.default_cover);
+				BitmapWorkerTask worker = new BitmapWorkerTask(target);
+				worker.execute(image);
+			}
+		} else {
+			target.setImageResource(R.drawable.default_cover);
+		}
+	}
+
+	public void addBitmapToCache(long id, Bitmap bitmap) {
+		imageCache.put(id, bitmap);
+	}
+
+	public Bitmap getBitmapFromCache(long id) {
+		return imageCache.get(id);
+	}
+
+	class BitmapWorkerTask extends AsyncTask<FeedImage, Void, Void> {
+		private static final String TAG = "BitmapWorkerTask";
+		private ImageView target;
+		private Bitmap bitmap;
+
+		public BitmapWorkerTask(ImageView target) {
+			super();
+			this.target = target;
+		}
+
+		@Override
+		protected void onPostExecute(Void result) {
+			super.onPostExecute(result);
+			target.setImageBitmap(bitmap);
+		}
+
+		@Override
+		protected Void doInBackground(FeedImage... params) {
+			if (params[0].getFile_url() != null) {
+				bitmap = BitmapFactory.decodeFile(params[0].getFile_url());
+				addBitmapToCache(params[0].getId(), bitmap);
+				Log.d(TAG, "Finished loading bitmaps");
+			} else {
+				Log.e(TAG, "FeedImage has no file url. Using default image");
+				bitmap = BitmapFactory.decodeResource(target.getResources(),
+						R.drawable.default_cover);
+			}
+			return null;
+		}
+	}
+
+}

src/de/podfetcher/feed/FeedImage.java

@@ -1,19 +1,17 @@
 package de.podfetcher.feed;
 
-import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
 
 public class FeedImage extends FeedFile {
 	protected String title;
-	protected Bitmap image_bitmap;
 
 	public FeedImage(String download_url, String title) {
 		super(null, download_url, false);
 		this.download_url = download_url;
 		this.title = title;
 	}
-	
-	public FeedImage(long id, String title, String file_url, String download_url, boolean downloaded) {
+
+	public FeedImage(long id, String title, String file_url,
+			String download_url, boolean downloaded) {
 		super(file_url, download_url, downloaded);
 		this.id = id;
 		this.title = title;
@@ -26,22 +24,9 @@ public class FeedImage extends FeedFile {
 	public String getTitle() {
 		return title;
 	}
-	
 
 	public void setTitle(String title) {
 		this.title = title;
 	}
 
-	public Bitmap getImageBitmap() {
-		if(image_bitmap == null) {
-			image_bitmap = BitmapFactory.decodeFile(getFile_url());	
-		}
-		return image_bitmap;
-	}
-	
-	
-	
-	
-	
-	
 }

src/de/podfetcher/fragment/CoverFragment.java

@@ -11,6 +11,7 @@ import android.widget.TextView;
 import com.actionbarsherlock.app.SherlockFragment;
 
 import de.podfetcher.R;
+import de.podfetcher.asynctask.FeedImageLoader;
 import de.podfetcher.feed.Feed;
 import de.podfetcher.feed.FeedItem;
 import de.podfetcher.feed.FeedManager;
@@ -42,7 +43,7 @@ public class CoverFragment extends SherlockFragment {
 	@Override
 	public void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
-		
+
 		FeedManager manager = FeedManager.getInstance();
 		FeedItem item = null;
 		Bundle args = getArguments();
@@ -68,7 +69,7 @@ public class CoverFragment extends SherlockFragment {
 		imgvCover = (ImageView) root.findViewById(R.id.imgvCover);
 		return root;
 	}
-	
+
 	@Override
 	public void onViewCreated(View view, Bundle savedInstanceState) {
 		super.onViewCreated(view, savedInstanceState);
@@ -80,8 +81,8 @@ public class CoverFragment extends SherlockFragment {
 	}
 
 	private void loadMediaInfo() {
-		imgvCover.setImageBitmap(media.getItem().getFeed().getImage()
-				.getImageBitmap());
+		FeedImageLoader.getInstance().loadBitmap(
+				media.getItem().getFeed().getImage(), imgvCover);
 		txtvTitle.setText(media.getItem().getTitle());
 		txtvFeed.setText(media.getItem().getFeed().getTitle());
 	}