+++ /dev/null
-package org.openintents.filemanager;
-
-import java.lang.ref.SoftReference;
-import java.lang.ref.WeakReference;
-import java.util.ArrayList;
-import java.util.LinkedHashMap;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-
-import org.openintents.filemanager.util.FileUtils;
-import org.openintents.filemanager.util.ImageUtils;
-
-import android.app.Activity;
-import android.content.Context;
-import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
-import android.graphics.Canvas;
-import android.graphics.Matrix;
-import android.graphics.drawable.BitmapDrawable;
-import android.graphics.drawable.Drawable;
-import android.os.Handler;
-import android.util.Log;
-import android.widget.ImageView;
-
-public class ThumbnailLoader {
-
- private static final String TAG = "OIFM_ThumbnailLoader";
-
- // Both hard and soft caches are purged after 40 seconds idling.
- private static final int DELAY_BEFORE_PURGE = 40000;
- private static final int MAX_CACHE_CAPACITY = 40;
-
- // Maximum number of threads in the executor pool.
- // TODO: Tune POOL_SIZE for maximum performance gain
- private static final int POOL_SIZE = 5;
-
- private boolean cancel;
- private Context mContext;
-
- //private static int thumbnailWidth = 96;
- //private static int thumbnailHeight = 129;
- private static int thumbnailWidth = 32;
- private static int thumbnailHeight = 32;
-
- private Runnable purger;
- private Handler purgeHandler;
- private ExecutorService mExecutor;
-
- // Soft bitmap cache for thumbnails removed from the hard cache.
- // This gets cleared by the Garbage Collector everytime we get low on memory.
- private ConcurrentHashMap<String, SoftReference<Bitmap>> mSoftBitmapCache;
- private LinkedHashMap<String, Bitmap> mHardBitmapCache;
- private ArrayList<String> mBlacklist;
-
- /**
- * Used for loading and decoding thumbnails from files.
- *
- * @author PhilipHayes
- * @param context Current application context.
- */
- public ThumbnailLoader(Context context) {
- mContext = context;
-
- purger = new Runnable(){
- @Override
- public void run() {
- Log.d(TAG, "Purge Timer hit; Clearing Caches.");
- clearCaches();
- }
- };
-
- purgeHandler = new Handler();
- mExecutor = Executors.newFixedThreadPool(POOL_SIZE);
-
- mBlacklist = new ArrayList<String>();
- mSoftBitmapCache = new ConcurrentHashMap<String, SoftReference<Bitmap>>(MAX_CACHE_CAPACITY / 2);
- mHardBitmapCache = new LinkedHashMap<String, Bitmap>(MAX_CACHE_CAPACITY / 2, 0.75f, true){
-
- /***/
- private static final long serialVersionUID = 1347795807259717646L;
-
- @Override
- protected boolean removeEldestEntry(LinkedHashMap.Entry<String, Bitmap> eldest){
- // Moves the last used item in the hard cache to the soft cache.
- if(size() > MAX_CACHE_CAPACITY){
- mSoftBitmapCache.put(eldest.getKey(), new SoftReference<Bitmap>(eldest.getValue()));
- return true;
- } else {
- return false;
- }
- }
- };
- }
-
- public static void setThumbnailHeight(int height) {
- thumbnailHeight = height;
- thumbnailWidth = height * 4 / 3;
- }
-
- /**
- *
- * @param parentFile The current directory.
- * @param text The IconifiedText container.
- * @param imageView The ImageView from the IconifiedTextView.
- */
- public void loadImage(String parentFile, IconifiedText text, ImageView imageView) {
- if(!cancel && !mBlacklist.contains(text.getText())){
- // We reset the caches after every 30 or so seconds of inactivity for memory efficiency.
- resetPurgeTimer();
-
- Bitmap bitmap = getBitmapFromCache(text.getText());
- if(bitmap != null){
- // We're still in the UI thread so we just update the icons from here.
- imageView.setImageBitmap(bitmap);
- text.setIcon(bitmap);
- } else {
- if (!cancel) {
- // Submit the file for decoding.
- Thumbnail thumbnail = new Thumbnail(parentFile, imageView, text);
- WeakReference<ThumbnailRunner> runner = new WeakReference<ThumbnailRunner>(new ThumbnailRunner(thumbnail));
- mExecutor.submit(runner.get());
- }
- }
- }
- }
- /**
- * Cancels any downloads, shuts down the executor pool,
- * and then purges the caches.
- */
- public void cancel(){
- cancel = true;
-
- // We could also terminate it immediately,
- // but that may lead to synchronization issues.
- if(!mExecutor.isShutdown()){
- mExecutor.shutdown();
- }
-
- stopPurgeTimer();
-
- mContext = null;
- clearCaches();
- }
-
- /**
- * Stops the cache purger from running until it is reset again.
- */
- public void stopPurgeTimer(){
- purgeHandler.removeCallbacks(purger);
- }
-
- /**
- * Purges the cache every (DELAY_BEFORE_PURGE) milliseconds.
- * @see DELAY_BEFORE_PURGE
- */
- private void resetPurgeTimer() {
- purgeHandler.removeCallbacks(purger);
- purgeHandler.postDelayed(purger, DELAY_BEFORE_PURGE);
- }
-
- private void clearCaches(){
- mSoftBitmapCache.clear();
- mHardBitmapCache.clear();
- mBlacklist.clear();
- }
-
- /**
- * @param key In this case the file name (used as the mapping id).
- * @return bitmap The cached bitmap or null if it could not be located.
- *
- * As the name suggests, this method attemps to obtain a bitmap stored
- * in one of the caches. First it checks the hard cache for the key.
- * If a key is found, it moves the cached bitmap to the head of the cache
- * so it gets moved to the soft cache last.
- *
- * If the hard cache doesn't contain the bitmap, it checks the soft cache
- * for the cached bitmap. If neither of the caches contain the bitmap, this
- * returns null.
- */
- private Bitmap getBitmapFromCache(String key){
- synchronized(mHardBitmapCache) {
- Bitmap bitmap = mHardBitmapCache.get(key);
- if(bitmap != null){
- // Put bitmap on top of cache so it's purged last.
- mHardBitmapCache.remove(key);
- mHardBitmapCache.put(key, bitmap);
- return bitmap;
- }
- }
-
- SoftReference<Bitmap> bitmapRef = mSoftBitmapCache.get(key);
- if(bitmapRef != null){
- Bitmap bitmap = bitmapRef.get();
- if(bitmap != null){
- return bitmap;
- } else {
- // Must have been collected by the Garbage Collector
- // so we remove the bucket from the cache.
- mSoftBitmapCache.remove(key);
- }
- }
-
- // Could not locate the bitmap in any of the caches, so we return null.
- return null;
- }
-
- /**
- * @param parentFile The parentFile, so we can obtain the full path of the bitmap
- * @param fileName The name of the file, also the text in the list item.
- * @return The resized and resampled bitmap, if can not be decoded it returns null.
- */
- private Bitmap decodeFile(String parentFile, String fileName) {
- if(!cancel){
- try {
- BitmapFactory.Options options = new BitmapFactory.Options();
-
- options.inJustDecodeBounds = true;
- options.outWidth = 0;
- options.outHeight = 0;
- options.inSampleSize = 1;
-
- String filePath = FileUtils.getFile(parentFile, fileName).getPath();
-
- BitmapFactory.decodeFile(filePath, options);
-
- if(options.outWidth > 0 && options.outHeight > 0){
- if (!cancel) {
- // Now see how much we need to scale it down.
- int widthFactor = (options.outWidth + thumbnailWidth - 1)
- / thumbnailWidth;
- int heightFactor = (options.outHeight + thumbnailHeight - 1)
- / thumbnailHeight;
- widthFactor = Math.max(widthFactor, heightFactor);
- widthFactor = Math.max(widthFactor, 1);
- // Now turn it into a power of two.
- if (widthFactor > 1) {
- if ((widthFactor & (widthFactor - 1)) != 0) {
- while ((widthFactor & (widthFactor - 1)) != 0) {
- widthFactor &= widthFactor - 1;
- }
-
- widthFactor <<= 1;
- }
- }
- options.inSampleSize = widthFactor;
- options.inJustDecodeBounds = false;
- Bitmap bitmap = ImageUtils.resizeBitmap(
- BitmapFactory.decodeFile(filePath, options),
- 72, 72);
- if (bitmap != null) {
- return bitmap;
- }
- }
- } else {
- // Must not be a bitmap, so we add it to the blacklist.
- if(!mBlacklist.contains(fileName)){
- mBlacklist.add(fileName);
- }
- }
- } catch(Exception e) { }
- }
- return null;
- }
-
- /**
- * Holder object for thumbnail information.
- */
- private class Thumbnail {
- public String parentFile;
- public ImageView imageView;
- public IconifiedText text;
-
- public Thumbnail(String parentFile, ImageView imageView, IconifiedText text) {
- this.parentFile = parentFile;
- this.imageView = imageView;
- this.text = text;
- }
- }
-
- /**
- * Decodes the bitmap and sends a ThumbnailUpdater on the UI Thread
- * to update the listitem and iconified text.
- *
- * @see ThumbnailUpdater
- */
- private class ThumbnailRunner implements Runnable {
- Thumbnail thumb;
- ThumbnailRunner(Thumbnail thumb){
- this.thumb = thumb;
- }
-
- @Override
- public void run() {
- if(!cancel){
- Bitmap bitmap = decodeFile(thumb.parentFile, thumb.text.getText());
- if(bitmap != null && !cancel){
- // Bitmap was successfully decoded so we place it in the hard cache.
- mHardBitmapCache.put(thumb.text.getText(), bitmap);
- Activity activity = ((Activity) mContext);
- activity.runOnUiThread(new ThumbnailUpdater(bitmap, thumb));
- thumb = null;
- }
- }
- }
- }
-
- /**
- * When run on the UI Thread, this updates the
- * thumbnail in the corresponding iconifiedtext and imageview.
- */
- private class ThumbnailUpdater implements Runnable {
- private Bitmap bitmap;
- private Thumbnail thumb;
-
- public ThumbnailUpdater(Bitmap bitmap, Thumbnail thumb) {
- this.bitmap = bitmap;
- this.thumb = thumb;
- }
-
- @Override
- public void run() {
- if(bitmap != null && mContext != null && !cancel){
- thumb.imageView.setImageBitmap(bitmap);
- thumb.text.setIcon(bitmap);
- }
- }
- }
-}
notaz.gp2x.de / android_pandora.git / blobdiff