OutOfMemoryError：位图大小超出VM预算

public class AsyncImageLoader {

    private final String TAG = getClass().getSimpleName();
    private Context mContext;
    private HashMap<String, SoftReference<Bitmap>> mImageCache;

    public AsyncImageLoader(Context context) {
        mContext = context;
            mImageCache = new HashMap<String, SoftReference<Bitmap>>();
    }

    public Bitmap loadImage(final String identifier, final String imagePath, final ImageCallback imageCallback) {

        if (mImageCache.containsKey(imagePath)) {
            SoftReference<Bitmap> softReference = mImageCache.get(imagePath);
            Bitmap bitmap = softReference.get();
            if (bitmap != null) {
                Log.i(TAG, \"Retrieving image from cache: \" + imagePath);
                return bitmap;
            }
        }

        final Handler handler = new Handler() {
            @Override
            public void handleMessage(Message message) {
                imageCallback.imageLoaded((Bitmap) message.obj, imagePath, identifier);
            }
        };

        new Thread() {

            @Override
            public void run() {
                Bitmap bitmap = loadImageFromPath(imagePath);
                mImageCache.put(imagePath, new SoftReference<Bitmap>(bitmap));
                Message message = handler.obtainMessage(0, bitmap);
                handler.sendMessage(message);
            }

        }.start();

        return null;
    }

    public Bitmap loadImageFromPath(String path) {

        if(!GeneralUtilities.isEmpty(path)) {
            Log.i(TAG, \"Loading image: \" + path);
            InputStream imageInputStream = null;

            try {               
                final AssetManager assetManager = mContext.getResources().getAssets(); 
                imageInputStream = assetManager.open(path);

                Bitmap bitmap = GeneralUtilities.decodeFile(imageInputStream);

                imageInputStream.close();

                return bitmap;
            } catch (final IOException e) {
                Log.e(TAG, e.getMessage());
            }        
        }

        return null;
    }

    public interface ImageCallback {
        public void imageLoaded(Bitmap imageBitmap, String imagePath, String identifier);
    }
}

public static Bitmap decodeFile(InputStream is){
        //Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(is, null, o);

        //The new size we want to scale to
        final int REQUIRED_SIZE=140;

        //Find the correct scale value. It should be the power of 2.
        int width_tmp = o.outWidth, height_tmp = o.outHeight;
        int scale = 1;

        while(true) {
            if(width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE)
                break;
            width_tmp /= 2;
            height_tmp /= 2;

            scale *= 2;
        }

        //Decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize = scale;
        return BitmapFactory.decodeStream(is, null, o2);  
      }

final ImageView itemImage = cache.getHistoryImage();        
        //final ImageView itemFrame = cache.getFrame();

        String filename = item.getFilename().trim();

        itemImage.setTag(\"front_\" + filename);

        Bitmap cachedImage = mAsyncImageLoader.loadImage(\"front_\" + filename, filename, new ImageCallback() {

            public void imageLoaded(Bitmap imageBitmap, String imagePath, String identifier) {

                ImageView imageViewByTag = (ImageView) mGallery.findViewWithTag(identifier);
                if (imageViewByTag != null) {
                    imageViewByTag.setImageBitmap(imageBitmap);
                }
            }
        });

        itemImage.setImageBitmap(cachedImage);