Android Open Source - FPlayAndroid Album Art Fetcher

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The source code is released under:
Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the followin...
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Java Source Code

//
// FPlayAndroid is distributed under the FreeBSD License
////w  w  w  .j av  a2  s.c om
// Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
//
// https://github.com/carlosrafaelgn/FPlayAndroid
//
package br.com.carlosrafaelgn.fplay.list;

import android.app.Service;
import android.content.ContentResolver;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.SystemClock;
import android.provider.MediaStore;

import br.com.carlosrafaelgn.fplay.playback.Player;
import br.com.carlosrafaelgn.fplay.ui.UI;
import br.com.carlosrafaelgn.fplay.util.BitmapLruCache;
import br.com.carlosrafaelgn.fplay.util.ReleasableBitmapWrapper;

//Good information:
//http://developer.android.com/training/displaying-bitmaps/manage-memory.html
//http://developer.android.com/training/displaying-bitmaps/cache-bitmap.html
//http://developer.android.com/reference/android/util/LruCache.html
public final class AlbumArtFetcher implements Runnable, Handler.Callback {
  public static interface AlbumArtFetcherListener {
    //Runs on a SECONDARY thread
    public void albumArtFetched(ReleasableBitmapWrapper bitmap, int requestId);
    
    //Runs on a SECONDARY thread
    public FileSt fileForRequestId(int requestId);
  }
  
  private final Object sync;
  private final BitmapFactory.Options opts;
  private final ContentResolver contentResolver;
  private volatile BitmapLruCache cache;
  private byte[] tempStorage;
  private Canvas canvas;
  private Paint paint;
  private Rect srcR, dstR;
  private Handler handler;
  private Looper looper;
  
  public AlbumArtFetcher() {
    sync = new Object();
    opts = new BitmapFactory.Options();
    final Service s = Player.getService();
    contentResolver = ((s != null) ? s.getContentResolver() : null);
    long max = Runtime.getRuntime().maxMemory();
    max >>= 4; //1/16
    //do not eat up more than 8 MiB
    if (max > (8 * 1024 * 1024))
      max = 8 * 1024 * 1024;
    cache = new BitmapLruCache((int)max);
    tempStorage = new byte[16384];
    canvas = new Canvas();
    paint = new Paint();
    paint.setAntiAlias(false);
    paint.setFilterBitmap(true);
    paint.setDither(false);
    srcR = new Rect();
    dstR = new Rect();
    (new Thread(this, "Album Art Fetcher Thread")).start();
  }
  
  //Runs on a SECONDARY thread
  @Override
  public void run() {
    Looper.prepare();
    looper = Looper.myLooper();
    handler = new Handler(looper, this);
    Looper.loop();
  }
  
  //Runs on a SECONDARY thread
  @Override
  public boolean handleMessage(Message msg) {
    final AlbumArtFetcherListener listener = (AlbumArtFetcherListener)msg.obj;
    final Canvas c = canvas;
    final Paint p = paint;
    msg.obj = null;
    String uri;
    Bitmap b = null, b2 = null;
    ReleasableBitmapWrapper w = null;
    FileSt file;
    if (c == null || p == null || listener == null || (file = listener.fileForRequestId(msg.what)) == null)
      return true;
    
    uri = file.albumArt;
    if (uri == null) {
      if (contentResolver == null) {
        file.artistIdForAlbumArt = 0;
        return true;
      }
      //try to fetch the first album for this artist
      final String[] proj = { MediaStore.Audio.Albums.ALBUM_ART };
      final Cursor cursor = contentResolver.query(MediaStore.Audio.Artists.Albums.getContentUri("external", file.artistIdForAlbumArt), proj, null, null, null);
      while (uri == null && !opts.mCancel && cursor.moveToNext())
        uri = cursor.getString(0);
      cursor.close();
      file.artistIdForAlbumArt = 0;
      if (uri == null)
        return true;
      file.albumArt = uri;
      synchronized (sync) {
        if (cache != null && (w = cache.get(uri)) != null) {
          listener.albumArtFetched(w, msg.what);
          return true;
        }
      }
    }
    
    if (opts.mCancel)
      return true;
    
    try {
      opts.inJustDecodeBounds = true;
      opts.inTempStorage = tempStorage;
      BitmapFactory.decodeFile(uri, opts);
      int ss = 0;
      int s = ((opts.outWidth >= opts.outHeight) ? opts.outWidth : opts.outHeight);
      do {
        ss++;
        s >>= 1;
      } while (s > msg.arg1);
      //opts.inInputShareable = false;
      opts.inPreferQualityOverSpeed = false;
      opts.inJustDecodeBounds = false;
      opts.inScaled = false;
      opts.inDensity = 0;
      opts.inTargetDensity = 0;
      opts.inPreferredConfig = Bitmap.Config.RGB_565;
      opts.inSampleSize = 1 << (ss - 1);
      if (opts.mCancel)
        return true;
      b = BitmapFactory.decodeFile(uri, opts);
      //I decided to do all this work here, because Bitmap.createScaledBitmap()
      //creates a lot of temporary objects every time it is called, including
      //a Canvas and a Paint
      if (opts.outWidth == msg.arg1 && opts.outHeight == msg.arg1) {
        w = new ReleasableBitmapWrapper(b);
      } else {
        srcR.right = opts.outWidth;
        srcR.bottom = opts.outHeight;
        if (srcR.right >= srcR.bottom) {
          dstR.right = msg.arg1;
          dstR.bottom = (srcR.bottom * msg.arg1) / srcR.right;
          //if we are missing the size by a handful of pixels, let's just
          //stretch the image a little bit... ;)
          if ((msg.arg1 - dstR.bottom) <= UI._4dp)
            dstR.bottom = msg.arg1;
        } else {
          dstR.bottom = msg.arg1;
          dstR.right = (srcR.right * msg.arg1) / srcR.bottom;
          //if we are missing the size by a handful of pixels, let's just
          //stretch the image a little bit... ;)
          if ((msg.arg1 - dstR.right) <= UI._4dp)
            dstR.right = msg.arg1;
        }
        b2 = Bitmap.createBitmap(dstR.right, dstR.bottom, Bitmap.Config.RGB_565);
        c.setBitmap(b2);
        c.drawBitmap(b, srcR, dstR, p);
        b.recycle();
        w = new ReleasableBitmapWrapper(b2);
      }
    } catch (Throwable ex) {
      try {
        if (b != null)
          b.recycle();
      } catch (Throwable ex2) {
      }
      try {
        if (b2 != null)
          b2.recycle();
      } catch (Throwable ex2) {
      }
      listener.albumArtFetched(null, msg.what);
      return true;
    }
    
    synchronized (sync) {
      if (cache != null) {
        cache.put(uri, w);
        listener.albumArtFetched(w, msg.what);
      }
    }
    
    return true;
  }
  
  //Runs on the MAIN thread
  public ReleasableBitmapWrapper getAlbumArt(FileSt file, int desiredSize, int requestId, AlbumArtFetcherListener listener) {
    synchronized (sync) {
      if (cache == null)
        return null;
      if (file.albumArt != null) {
        final ReleasableBitmapWrapper bitmap = cache.get(file.albumArt);
        if (bitmap != null) {
          bitmap.addRef();
          return bitmap;
        }
      }
    }
    if (handler != null) {
      //wait before actually trying to fetch the albumart, as this request could
      //soon be cancelled, for example, in a ListView being scrolled fast
      handler.sendMessageAtTime(Message.obtain(handler, requestId, desiredSize, 0, listener), SystemClock.uptimeMillis());
    }
    return null;
  }
  
  //Runs on the MAIN thread
  public void cancelRequest(int requestId, AlbumArtFetcherListener listener) {
    if (handler != null)
      handler.removeMessages(requestId, listener);
  }
  
  //Runs on the MAIN thread
  public void stopAndCleanup() {
    synchronized (sync) {
      handler = null;
      if (cache != null) {
        cache.evictAll();
        cache = null;
      }
    }
    opts.mCancel = true;
    tempStorage = null;
    canvas = null;
    paint = null;
    if (looper != null) {
      looper.quit();
      looper = null;
    }
  }
}
Java Source Code List
