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package de.danoeh.antennapod.asynctask;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import android.annotation.SuppressLint;
import android.app.ActivityManager;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Handler;
import android.support.v4.util.LruCache;
import android.util.Log;
import android.widget.ImageView;
import de.danoeh.antennapod.AppConfig;
import de.danoeh.antennapod.PodcastApp;
import de.danoeh.antennapod.R;
import de.danoeh.antennapod.feed.FeedImage;
/** Caches and loads FeedImage bitmaps in the background */
public class ImageLoader {
private static final String TAG = "ImageLoader";
private static ImageLoader singleton;
public static final int IMAGE_TYPE_THUMBNAIL = 0;
public static final int IMAGE_TYPE_COVER = 1;
private Handler handler;
private ExecutorService executor;
/**
* Stores references to loaded bitmaps. Bitmaps can be accessed by the id of
* the FeedImage the bitmap belongs to.
*/
final int memClass = ((ActivityManager) PodcastApp.getInstance()
.getSystemService(Context.ACTIVITY_SERVICE)).getMemoryClass();
// Use 1/8th of the available memory for this memory cache.
final int thumbnailCacheSize = 1024 * 1024 * memClass / 8;
private LruCache<String, CachedBitmap> coverCache;
private LruCache<String, CachedBitmap> thumbnailCache;
private ImageLoader() {
handler = new Handler();
executor = createExecutor();
coverCache = new LruCache<String, CachedBitmap>(1);
thumbnailCache = new LruCache<String, CachedBitmap>(thumbnailCacheSize) {
@SuppressLint("NewApi")
@Override
protected int sizeOf(String key, CachedBitmap value) {
if (Integer.valueOf(android.os.Build.VERSION.SDK_INT) >= 12)
return value.getBitmap().getByteCount();
else
return (value.getBitmap().getRowBytes() * value.getBitmap()
.getHeight());
}
};
}
private ExecutorService createExecutor() {
return Executors.newFixedThreadPool(Runtime.getRuntime()
.availableProcessors() + 1, new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setPriority(Thread.MIN_PRIORITY);
return t;
}
});
}
public static ImageLoader getInstance() {
if (singleton == null) {
singleton = new ImageLoader();
}
return singleton;
}
/**
* Load a bitmap from the cover cache. If the bitmap is not in the cache, it
* will be loaded from the disk. This method should either be called if the
* ImageView's size has already been set or inside a Runnable which is
* posted to the ImageView's message queue.
*/
public void loadCoverBitmap(String fileUrl, ImageView target) {
loadCoverBitmap(fileUrl, target, target.getHeight());
}
public void loadCoverBitmap(FeedImage image, ImageView target) {
loadCoverBitmap((image != null) ? image.getFile_url() : null, target,
target.getHeight());
}
public void loadCoverBitmap(FeedImage image, ImageView target, int length) {
loadCoverBitmap((image != null) ? image.getFile_url() : null, target,
length);
}
/**
* Load a bitmap from the cover cache. If the bitmap is not in the cache, it
* will be loaded from the disk. This method should either be called if the
* ImageView's size has already been set or inside a Runnable which is
* posted to the ImageView's message queue.
*/
public void loadCoverBitmap(String fileUrl, ImageView target, int length) {
final int defaultCoverResource = getDefaultCoverResource(target
.getContext());
if (fileUrl != null) {
CachedBitmap cBitmap = getBitmapFromCoverCache(fileUrl);
if (cBitmap != null && cBitmap.getLength() >= length) {
target.setImageBitmap(cBitmap.getBitmap());
} else {
target.setImageResource(defaultCoverResource);
BitmapDecodeWorkerTask worker = new BitmapDecodeWorkerTask(
handler, target, fileUrl, length, IMAGE_TYPE_COVER);
executor.submit(worker);
}
} else {
target.setImageResource(defaultCoverResource);
}
}
/**
* Load a bitmap from the thumbnail cache. If the bitmap is not in the
* cache, it will be loaded from the disk. This method should either be
* called if the ImageView's size has already been set or inside a Runnable
* which is posted to the ImageView's message queue.
*/
public void loadThumbnailBitmap(String fileUrl, ImageView target) {
loadThumbnailBitmap(fileUrl, target, target.getHeight());
}
public void loadThumbnailBitmap(FeedImage image, ImageView target) {
loadThumbnailBitmap((image != null) ? image.getFile_url() : null,
target, target.getHeight());
}
public void loadThumbnailBitmap(FeedImage image, ImageView target,
int length) {
loadThumbnailBitmap((image != null) ? image.getFile_url() : null,
target, length);
}
/**
* Load a bitmap from the thumbnail cache. If the bitmap is not in the
* cache, it will be loaded from the disk. This method should either be
* called if the ImageView's size has already been set or inside a Runnable
* which is posted to the ImageView's message queue.
*/
public void loadThumbnailBitmap(String fileUrl, ImageView target, int length) {
final int defaultCoverResource = getDefaultCoverResource(target
.getContext());
if (fileUrl != null) {
CachedBitmap cBitmap = getBitmapFromThumbnailCache(fileUrl);
if (cBitmap != null && cBitmap.getLength() >= length) {
target.setImageBitmap(cBitmap.getBitmap());
} else {
target.setImageResource(defaultCoverResource);
BitmapDecodeWorkerTask worker = new BitmapDecodeWorkerTask(
handler, target, fileUrl, length, IMAGE_TYPE_THUMBNAIL);
executor.submit(worker);
}
} else {
target.setImageResource(defaultCoverResource);
}
}
public void clearExecutorQueue() {
executor.shutdownNow();
if (AppConfig.DEBUG)
Log.d(TAG, "Executor was shut down.");
executor = createExecutor();
}
public void wipeImageCache() {
coverCache.evictAll();
thumbnailCache.evictAll();
}
public boolean isInThumbnailCache(String fileUrl) {
return thumbnailCache.get(fileUrl) != null;
}
private CachedBitmap getBitmapFromThumbnailCache(String key) {
return thumbnailCache.get(key);
}
public void addBitmapToThumbnailCache(String key, CachedBitmap bitmap) {
thumbnailCache.put(key, bitmap);
}
public boolean isInCoverCache(String fileUrl) {
return coverCache.get(fileUrl) != null;
}
private CachedBitmap getBitmapFromCoverCache(String key) {
return coverCache.get(key);
}
public void addBitmapToCoverCache(String key, CachedBitmap bitmap) {
coverCache.put(key, bitmap);
}
private int getDefaultCoverResource(Context context) {
TypedArray res = context
.obtainStyledAttributes(new int[] { R.attr.default_cover });
final int defaultCoverResource = res.getResourceId(0, 0);
res.recycle();
return defaultCoverResource;
}
}
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