AndroidTouchGalleryLibrary 优化

AndroidTouchGalleryLibrary 是一个非常好用的库，

但是使用的时候，需要小心处理，容易引发OutOfMemoryError，同时使用UrlTouchImageView的时候，

从网络下载是没有缓存的，因此每次都是新加载图片，同时使用在线家在较大图片容易导致程序挂掉

因此将原先的UrlTouchImageView类中的此段代码更换

原代码：

//No caching load
    public class ImageLoadTask extends AsyncTask<String, Integer, Bitmap>
    {
        @Override
        protected Bitmap doInBackground(String... strings) {
            String url = strings[0];
            Bitmap bm = null;
            try {
                URL aURL = new URL(url);
                URLConnection conn = aURL.openConnection();
                conn.connect();
                InputStream is = conn.getInputStream();
                int totalLen = conn.getContentLength();
                InputStreamWrapper bis = new InputStreamWrapper(is, 8192, totalLen);
                bis.setProgressListener(new InputStreamProgressListener()
                {
                    @Override
                    public void onProgress(float progressValue, long bytesLoaded,
                            long bytesTotal)
                    {
                        publishProgress((int)(progressValue * 100));
                    }
                });
                bm = BitmapFactory.decodeStream(bis);
                bis.close();
                is.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return bm;
        }

        @Override
        protected void onPostExecute(Bitmap bitmap) {
            if (bitmap == null)
            {
                mImageView.setScaleType(ScaleType.CENTER);
                bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.no_photo);
                mImageView.setImageBitmap(bitmap);
            }
            else
            {
                mImageView.setScaleType(ScaleType.MATRIX);
                mImageView.setImageBitmap(bitmap);
            }
            mImageView.setVisibility(VISIBLE);
            mProgressBar.setVisibility(GONE);
        }

        @Override
        protected void onProgressUpdate(Integer... values)
        {
            mProgressBar.setProgress(values[0]);
        }
    }

更换为：

 //No caching load
    public class ImageLoadTask extends AsyncTask<String, Integer, Bitmap>
    {
        @Override
        protected Bitmap doInBackground(String... strings) {
            String url = strings[0];
            Bitmap bm = null;
            try {
                URL aURL = new URL(url);
                URLConnection conn = aURL.openConnection();
                conn.connect();
                InputStream is = conn.getInputStream();
                int totalLen = conn.getContentLength();
                InputStreamWrapper bis = new InputStreamWrapper(is, 8192, totalLen);
                bis.setProgressListener(new InputStreamProgressListener()
                {
                    @Override
                    public void onProgress(float progressValue, long bytesLoaded,
                            long bytesTotal)
                    {
                        publishProgress((int)(progressValue * 100));
                    }
                });
                BitmapFactory.Options options=new BitmapFactory.Options();
                options.inTempStorage = new byte[100*1024];
                options.inPreferredConfig = Bitmap.Config.RGB_565;
                options.inPurgeable = true;
                options.inSampleSize = 2;//压缩
                options.inInputShareable = true;
                bm = BitmapFactory.decodeStream(bis, null, options);
                bis.close();
                is.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return bm;
        }

        @Override
        protected void onPostExecute(Bitmap bitmap) {
            if (bitmap == null)
            {
                mImageView.setScaleType(ScaleType.CENTER);
                bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.no_photo);
                mImageView.setImageBitmap(bitmap);
            }
            else
            {
                mImageView.setScaleType(ScaleType.MATRIX);
                mImageView.setImageBitmap(bitmap);
            }
            mImageView.setVisibility(VISIBLE);
            mProgressBar.setVisibility(GONE);
        }

        @Override
        protected void onProgressUpdate(Integer... values)
        {
            mProgressBar.setProgress(values[0]);
        }
    }