Picasso decoder for subsampling-scale-image-view

PicassoDecoder.java

/**
 * Created by gokhanbarisaker on 8/30/15.
 */
public class PicassoDecoder implements ImageDecoder
{
    private String tag;
    private Picasso picasso;

    public PicassoDecoder(String tag, Picasso picasso) {
        this.tag = tag;
        this.picasso = picasso;
    }

    @Override
    public Bitmap decode(Context context, Uri uri) throws Exception {
        return picasso
                .load(uri)
                .tag(tag)
                .config(Bitmap.Config.ARGB_8888)
                .memoryPolicy(MemoryPolicy.NO_CACHE)
                .get();
    }
}

PicassoRegionDecoder.java

/**
 * Created by gokhanbarisaker on 8/30/15.
 */
public class PicassoRegionDecoder implements ImageRegionDecoder {
    private OkHttpClient client;
    private BitmapRegionDecoder decoder;
    private final Object decoderLock = new Object();
    
    public PicassoRegionDecoder (OkHttpClient client) {
        this.client = client;
    }

    @Override
    public Point init(Context context, Uri uri) throws Exception {
        OkHttpDownloader downloader = new OkHttpDownloader(client);
        InputStream inputStream = downloader.load(uri, 0).getInputStream();
        this.decoder = BitmapRegionDecoder.newInstance(inputStream, false);

        return new Point(this.decoder.getWidth(), this.decoder.getHeight());
    }

    @Override
    public Bitmap decodeRegion(Rect rect, int sampleSize) {
        synchronized(this.decoderLock) {
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = sampleSize;
            options.inPreferredConfig = Bitmap.Config.ARGB_8888;
            Bitmap bitmap = this.decoder.decodeRegion(rect, options);
            if(bitmap == null) {
                throw new RuntimeException("Region decoder returned null bitmap - image format may not be supported");
            } else {
                return bitmap;
            }
        }
    }

    @Override
    public boolean isReady() {
        return this.decoder != null && !this.decoder.isRecycled();
    }

    @Override
    public void recycle() {
        this.decoder.recycle();
    }
}