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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.graphics.Bitmap;
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;
import de.danoeh.antennapod.feed.FeedManager;
import de.danoeh.antennapod.miroguide.model.MiroGuideChannel;
import de.danoeh.antennapod.storage.DownloadRequester;
/** Caches and loads FeedImage bitmaps in the background */
public class FeedImageLoader {
private static final String TAG = "FeedImageLoader";
private static FeedImageLoader 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 coverCacheSize = 1024 * 1024 * memClass / 8;
final int thumbnailCacheSize = 1024 * 1024 * memClass / 8;
private LruCache<String, CachedBitmap> coverCache;
private LruCache<String, CachedBitmap> thumbnailCache;
private FeedImageLoader() {
handler = new Handler();
executor = createExecutor();
coverCache = new LruCache<String, CachedBitmap>(coverCacheSize) {
@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());
}
};
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 FeedImageLoader getInstance() {
if (singleton == null) {
singleton = new FeedImageLoader();
}
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(FeedImage image, ImageView target) {
loadCoverBitmap(image, target, target.getHeight());
}
/**
* 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(FeedImage image, ImageView target, int length) {
if (image != null && image.getFile_url() != null) {
CachedBitmap cBitmap = getBitmapFromCoverCache(image.getFile_url());
if (cBitmap != null && cBitmap.getLength() >= length) {
target.setImageBitmap(cBitmap.getBitmap());
} else {
target.setImageResource(R.drawable.default_cover);
FeedImageDecodeWorkerTask worker = new FeedImageDecodeWorkerTask(
handler, target, image, length, IMAGE_TYPE_COVER);
executor.submit(worker);
}
} else {
target.setImageResource(R.drawable.default_cover);
}
}
/**
* 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(FeedImage image, ImageView target) {
loadThumbnailBitmap(image, target, target.getHeight());
}
/**
* 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(FeedImage image, ImageView target,
int length) {
if (image != null && image.getFile_url() != null) {
CachedBitmap cBitmap = getBitmapFromThumbnailCache(image.getFile_url());
if (cBitmap != null && cBitmap.getLength() >= length) {
target.setImageBitmap(cBitmap.getBitmap());
} else {
target.setImageResource(R.drawable.default_cover);
FeedImageDecodeWorkerTask worker = new FeedImageDecodeWorkerTask(
handler, target, image, length, IMAGE_TYPE_THUMBNAIL);
executor.submit(worker);
}
} else {
target.setImageResource(R.drawable.default_cover);
}
}
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(FeedImage image) {
return thumbnailCache.get(image.getFile_url()) != null;
}
private CachedBitmap getBitmapFromThumbnailCache(String key) {
return thumbnailCache.get(key);
}
public void addBitmapToThumbnailCache(String key, CachedBitmap bitmap) {
thumbnailCache.put(key, bitmap);
}
public boolean isInCoverCache(FeedImage image) {
return coverCache.get(image.getFile_url()) != null;
}
private CachedBitmap getBitmapFromCoverCache(String key) {
return coverCache.get(key);
}
public void addBitmapToCoverCache(String key, CachedBitmap bitmap) {
coverCache.put(key, bitmap);
}
class FeedImageDecodeWorkerTask extends BitmapDecodeWorkerTask {
private static final String TAG = "FeedImageDecodeWorkerTask";
protected FeedImage image;
public FeedImageDecodeWorkerTask(Handler handler, ImageView target,
FeedImage image, int length, int imageType) {
super(handler, target, image.getFile_url(), length, imageType);
this.image = image;
}
@Override
protected boolean tagsMatching(ImageView target) {
return target.getTag() == null || target.getTag() == image;
}
@Override
protected void onInvalidFileUrl() {
super.onInvalidFileUrl();
if (image.getFile_url() != null
&& !DownloadRequester.getInstance()
.isDownloadingFile(image)) {
FeedManager.getInstance().notifyInvalidImageFile(
PodcastApp.getInstance(), image);
}
}
}
}
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