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package de.danoeh.antennapod.asynctask;
import java.io.File;
import de.danoeh.antennapod.PodcastApp;
import de.danoeh.antennapod.feed.FeedImage;
import de.danoeh.antennapod.feed.FeedManager;
import de.danoeh.antennapod.storage.DownloadRequester;
import de.danoeh.antennapod.R;
import android.annotation.SuppressLint;
import android.app.ActivityManager;
import android.content.Context;
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 final String TAG = "FeedImageLoader";
private static FeedImageLoader singleton;
/**
* 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 cacheSize = 1024 * 1024 * memClass / 8;
private LruCache<Long, Bitmap> imageCache;
private FeedImageLoader() {
Log.d(TAG, "Creating cache with size " + cacheSize);
imageCache = new LruCache<Long, Bitmap>(cacheSize) {
@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;
}
@SuppressLint("NewApi")
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);
if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.GINGERBREAD_MR1) {
worker.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, image);
} else {
worker.execute(image);
}
}
} else {
target.setImageResource(R.drawable.default_cover);
}
}
public void addBitmapToCache(long id, Bitmap bitmap) {
imageCache.put(id, bitmap);
}
public void wipeImageCache() {
imageCache.evictAll();
}
public boolean isInCache(FeedImage image) {
return imageCache.get(image.getId()) != null;
}
public Bitmap getBitmapFromCache(long id) {
return imageCache.get(id);
}
class BitmapWorkerTask extends AsyncTask<FeedImage, Void, Void> {
/** The preferred width and height of a bitmap. */
private static final int LENGTH_BASE_VALUE = 200;
private int PREFERRED_LENGTH;
private static final String TAG = "BitmapWorkerTask";
private ImageView target;
private Bitmap bitmap;
private Bitmap decodedBitmap;
public BitmapWorkerTask(ImageView target) {
super();
this.target = target;
this.PREFERRED_LENGTH = (int) (LENGTH_BASE_VALUE * PodcastApp.getLogicalDensity());
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
target.setImageBitmap(bitmap);
}
private int calculateSampleSize(int width, int height) {
int max = Math.max(width, height);
if (max < PREFERRED_LENGTH) {
return 1;
} else {
// find first sample size where max / sampleSize <
// PREFERRED_LENGTH
for (int sampleSize = 1, power = 0;; power++, sampleSize = (int) Math
.pow(2, power)) {
int newLength = max / sampleSize;
if (newLength <= PREFERRED_LENGTH) {
if (newLength > 0) {
return sampleSize;
} else {
return sampleSize - 1;
}
}
}
}
}
@Override
protected Void doInBackground(FeedImage... params) {
File f = null;
if (params[0].getFile_url() != null) {
f = new File(params[0].getFile_url());
}
if (params[0].getFile_url() != null && f.exists()) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(params[0].getFile_url(), options);
int sampleSize = calculateSampleSize(options.outWidth,
options.outHeight);
options.inJustDecodeBounds = false;
options.inSampleSize = sampleSize;
decodedBitmap = BitmapFactory.decodeFile(
params[0].getFile_url(), options);
if (decodedBitmap == null) {
Log.i(TAG,
"Bitmap could not be decoded in custom sample size. Trying default sample size (path was "
+ params[0].getFile_url() + ")");
decodedBitmap = BitmapFactory.decodeFile(params[0]
.getFile_url());
}
bitmap = Bitmap.createScaledBitmap(decodedBitmap,
PREFERRED_LENGTH, PREFERRED_LENGTH, false);
addBitmapToCache(params[0].getId(), bitmap);
Log.d(TAG, "Finished loading bitmaps");
} else {
Log.e(TAG,
"FeedImage has no valid file url. Using default image");
bitmap = BitmapFactory.decodeResource(target.getResources(),
R.drawable.default_cover);
if (params[0].getFile_url() != null
&& !DownloadRequester.getInstance().isDownloadingFile(
params[0])) {
FeedManager.getInstance().notifyInvalidImageFile(
PodcastApp.getInstance(), params[0]);
}
}
return null;
}
}
}
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