com.nostra13.universalimageloader.utils.IoUtils Java Examples

@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
	DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
	if (editor == null) {
		return false;
	}

	OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
	boolean copied = false;
	try {
		copied = IoUtils.copyStream(imageStream, os, listener, bufferSize);
	} finally {
		IoUtils.closeSilently(os);
		if (copied) {
			editor.commit();
		} else {
			editor.abort();
		}
	}
	return copied;
}
 

public boolean save(String imageUri, Bitmap bitmap) throws IOException {
    File imageFile = getFile(imageUri);
    File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
    OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), this.bufferSize);
    boolean savedSuccessfully = false;
    try {
        savedSuccessfully = bitmap.compress(this.compressFormat, this.compressQuality, os);
        bitmap.recycle();
        return savedSuccessfully;
    } finally {
        IoUtils.closeSilently(os);
        if (savedSuccessfully && !tmpFile.renameTo(imageFile)) {
            savedSuccessfully = false;
        }
        if (!savedSuccessfully) {
            tmpFile.delete();
        }
    }
}
 

@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
    DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
    if (editor == null) {
        return false;
    }

    OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
    boolean copied = false;
    try {
        copied = IoUtils.copyStream(imageStream, os, listener, bufferSize);
    } finally {
        IoUtils.closeSilently(os);
        if (copied) {
            editor.commit();
        } else {
            editor.abort();
        }
    }
    return copied;
}
 

public boolean save(String imageUri, Bitmap bitmap) throws IOException {
    boolean z = false;
    Editor editor = this.cache.edit(getKey(imageUri));
    if (editor != null) {
        OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), this.bufferSize);
        z = false;
        try {
            z = bitmap.compress(this.compressFormat, this.compressQuality, os);
            if (z) {
                editor.commit();
            } else {
                editor.abort();
            }
        } finally {
            IoUtils.closeSilently(os);
        }
    }
    return z;
}
 

@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
    DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
    if (editor == null) {
        return false;
    }

    OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
    boolean savedSuccessfully = false;
    try {
        savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
    } finally {
        IoUtils.closeSilently(os);
    }
    if (savedSuccessfully) {
        editor.commit();
    } else {
        editor.abort();
    }
    return savedSuccessfully;
}
 

@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
    File imageFile = getFile(imageUri);
    File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
    OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
    boolean savedSuccessfully = false;
    try {
        savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
    } finally {
        IoUtils.closeSilently(os);
        if (savedSuccessfully && !tmpFile.renameTo(imageFile)) {
            savedSuccessfully = false;
        }
        if (!savedSuccessfully) {
            tmpFile.delete();
        }
    }
    bitmap.recycle();
    return savedSuccessfully;
}
 

public boolean save(String imageUri, InputStream imageStream, CopyListener listener) throws IOException {
    boolean z = false;
    Editor editor = this.cache.edit(getKey(imageUri));
    if (editor != null) {
        OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), this.bufferSize);
        z = false;
        try {
            z = IoUtils.copyStream(imageStream, os, listener, this.bufferSize);
        } finally {
            IoUtils.closeSilently(os);
            if (z) {
                editor.commit();
            } else {
                editor.abort();
            }
        }
    }
    return z;
}
 

/**
 * Retrieves {@link java.io.InputStream} of image by URI (image is located in the network).
 *
 * @param imageUri Image URI
 * @param extra    Auxiliary object which was passed to {@link com.nostra13.universalimageloader.core.DisplayImageOptions.Builder#extraForDownloader(Object)
 *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
 * @return {@link java.io.InputStream} of image
 * @throws java.io.IOException if some I/O error occurs during network request or if no InputStream could be created for
 *                     URL.
 */
protected InputStream getStreamFromNetwork(String imageUri, Object extra) throws IOException {
	HttpURLConnection conn = createConnection(imageUri, extra);

	int redirectCount = 0;
	while (conn.getResponseCode() / 100 == 3 && redirectCount < MAX_REDIRECT_COUNT) {
		conn = createConnection(conn.getHeaderField("Location"), extra);
		redirectCount++;
	}

	InputStream imageStream;
	try {
		imageStream = conn.getInputStream();
	} catch (IOException e) {
		// Read all data to allow reuse connection (http://bit.ly/1ad35PY)
		IoUtils.readAndCloseStream(conn.getErrorStream());
		throw e;
	}
	return new ContentLengthInputStream(new BufferedInputStream(imageStream, BUFFER_SIZE), conn.getContentLength());
}
 

@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
	File imageFile = getFile(imageUri);
	File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
	boolean loaded = false;
	try {
		OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
		try {
			loaded = IoUtils.copyStream(imageStream, os, listener, bufferSize);
		} finally {
			IoUtils.closeSilently(os);
		}
	} finally {
		if (loaded && !tmpFile.renameTo(imageFile)) {
			loaded = false;
		}
		if (!loaded) {
			tmpFile.delete();
		}
	}
	return loaded;
}
 

@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
	File imageFile = getFile(imageUri);
	File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
	OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
	boolean savedSuccessfully = false;
	try {
		savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
	} finally {
		IoUtils.closeSilently(os);
		if (savedSuccessfully && !tmpFile.renameTo(imageFile)) {
			savedSuccessfully = false;
		}
		if (!savedSuccessfully) {
			tmpFile.delete();
		}
	}
	bitmap.recycle();
	return savedSuccessfully;
}
 

@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
	DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
	if (editor == null) {
		return false;
	}

	OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
	boolean copied = false;
	try {
		copied = IoUtils.copyStream(imageStream, os, listener, bufferSize);
	} finally {
		IoUtils.closeSilently(os);
		if (copied) {
			editor.commit();
		} else {
			editor.abort();
		}
	}
	return copied;
}
 

@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
	DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
	if (editor == null) {
		return false;
	}

	OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
	boolean savedSuccessfully = false;
	try {
		savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
	} finally {
		IoUtils.closeSilently(os);
	}
	if (savedSuccessfully) {
		editor.commit();
	} else {
		editor.abort();
	}
	return savedSuccessfully;
}
 

public static byte[] getImageByteByBitmap(Bitmap upbitmap) {
    try {
        if (upbitmap == null) {
            return null;
        }
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        upbitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        int option = 100;
        while (baos.toByteArray().length / 1024 > 120) {
            baos.reset();
            option -= 10;
            upbitmap.compress(Bitmap.CompressFormat.JPEG, option, baos);
        }
        byte[] result = baos.toByteArray();
        IoUtils.closeSilently(baos);
        upbitmap.recycle();
        return result;
    } catch (Throwable e) {
        e.printStackTrace();
    }
    return null;
}
 

@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
	File imageFile = getFile(imageUri);
	File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
	boolean loaded = false;
	try {
		OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
		try {
			loaded = IoUtils.copyStream(imageStream, os, listener, bufferSize);
		} finally {
			IoUtils.closeSilently(os);
		}
	} finally {
		if (loaded && !tmpFile.renameTo(imageFile)) {
			loaded = false;
		}
		if (!loaded) {
			tmpFile.delete();
		}
	}
	return loaded;
}
 

@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
	File imageFile = getFile(imageUri);
	File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
	OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
	boolean savedSuccessfully = false;
	try {
		savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
	} finally {
		IoUtils.closeSilently(os);
		if (savedSuccessfully && !tmpFile.renameTo(imageFile)) {
			savedSuccessfully = false;
		}
		if (!savedSuccessfully) {
			tmpFile.delete();
		}
	}
	bitmap.recycle();
	return savedSuccessfully;
}
 

/**
 * Retrieves {@link InputStream} of image by URI (image is located in the network).
 *
 * @param imageUri Image URI
 * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
 *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
 * @return {@link InputStream} of image
 * @throws IOException if some I/O error occurs during network request or if no InputStream could be created for
 *                     URL.
 */
protected InputStream getStreamFromNetwork(String imageUri, Object extra) throws IOException {
	HttpURLConnection conn = createConnection(imageUri, extra);

	int redirectCount = 0;
	while (conn.getResponseCode() / 100 == 3 && redirectCount < MAX_REDIRECT_COUNT) {
		conn = createConnection(conn.getHeaderField("Location"), extra);
		redirectCount++;
	}

	InputStream imageStream;
	try {
		imageStream = conn.getInputStream();
	} catch (IOException e) {
		// Read all data to allow reuse connection (http://bit.ly/1ad35PY)
		IoUtils.readAndCloseStream(conn.getErrorStream());
		throw e;
	}
	if (!shouldBeProcessed(conn)) {
		IoUtils.closeSilently(imageStream);
		throw new IOException("Image request failed with response code " + conn.getResponseCode());
	}

	return new ContentLengthInputStream(new BufferedInputStream(imageStream, BUFFER_SIZE), conn.getContentLength());
}
 

@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
	DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
	if (editor == null) {
		return false;
	}

	OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
	boolean savedSuccessfully = false;
	try {
		savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
	} finally {
		IoUtils.closeSilently(os);
	}
	if (savedSuccessfully) {
		editor.commit();
	} else {
		editor.abort();
	}
	return savedSuccessfully;
}
 

protected InputStream getStreamFromNetwork(String s, Object obj)
{
    HttpURLConnection httpurlconnection = createConnection(s, obj);
    for (int i = 0; httpurlconnection.getResponseCode() / 100 == 3 && i < 5; i++)
    {
        httpurlconnection = createConnection(httpurlconnection.getHeaderField("Location"), obj);
    }

    InputStream inputstream;
    try
    {
        inputstream = httpurlconnection.getInputStream();
    }
    catch (IOException ioexception)
    {
        IoUtils.readAndCloseStream(httpurlconnection.getErrorStream());
        throw ioexception;
    }
    return new ContentLengthInputStream(new BufferedInputStream(inputstream, 32768), httpurlconnection.getContentLength());
}
 

/**
 * 根据文件流进行保存到缓存文件中
 * @param imageUri    Original image URI    原图片URL地址作为生成缓存文件的文件名
 * @param imageStream Input stream of image (shouldn't be closed in this method)   图片流
 * @param listener     用于监听流保存本地的进度
 * Listener for saving progress, can be ignored if you don't use
 *                    {@linkplain com.nostra13.universalimageloader.core.listener.ImageLoadingProgressListener
 *                    progress listener} in ImageLoader calls
 * @return
 * @throws IOException
 */
@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
	File imageFile = getFile(imageUri);
	File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
	boolean loaded = false;
	try {
		OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
		try {
			loaded = IoUtils.copyStream(imageStream, os, listener, bufferSize);
		} finally {
			IoUtils.closeSilently(os);
		}
	} finally {
		if (loaded && !tmpFile.renameTo(imageFile)) {
			loaded = false;
		}
		if (!loaded) {
			tmpFile.delete();
		}
	}
	return loaded;
}
 

/**
 * 进行保存图片(bitmap)到缓存中 其中根据imageurl来生成缓存文件命名
 * @param imageUri Original image URI
 * @param bitmap   Image bitmap
 * @return
 * @throws IOException
 */
@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
	//根据图片链接地址 生成本地文件
	File imageFile = getFile(imageUri);
	//生成临时文件
	File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
	//写入文件
	OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
	boolean savedSuccessfully = false;
	try {
		//进行图片压缩
		savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
	} finally {
		IoUtils.closeSilently(os);
		if (savedSuccessfully && !tmpFile.renameTo(imageFile)) {
			savedSuccessfully = false;
		}
		if (!savedSuccessfully) {
			tmpFile.delete();
		}
	}
	bitmap.recycle();
	return savedSuccessfully;
}
 

/**
 * 把图片流数据保存到缓存中
 * @param imageUri    Original image URI  图像URL连接地址
 * @param imageStream Input stream of image (shouldn't be closed in this method)  图片流
 * @param listener    图片流拷贝监听器
 * Listener for saving progress, can be ignored if you don't use
 *                    {@linkplain com.nostra13.universalimageloader.core.listener.ImageLoadingProgressListener
 *                    progress listener} in ImageLoader calls
 * @return
 * @throws IOException
 */
@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
	DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
	if (editor == null) {
		return false;
	}
       //流写入文件
	OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
	boolean copied = false;
	try {
		copied = IoUtils.copyStream(imageStream, os, listener, bufferSize);
	} finally {
		IoUtils.closeSilently(os);
		if (copied) {
			editor.commit();
		} else {
			editor.abort();
		}
	}
	return copied;
}
 

/**
 * 把图片bitmap存入到缓存器中
 * @param imageUri Original image URI  图片URL地址
 * @param bitmap   Image bitmap   需要保存的图片
 * @return
 * @throws IOException
 */
@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
	DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
	if (editor == null) {
		return false;
	}
       //流写入文件
	OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
	boolean savedSuccessfully = false;
	try {
		savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
	} finally {
		IoUtils.closeSilently(os);
	}
	if (savedSuccessfully) {
		editor.commit();
	} else {
		editor.abort();
	}
	return savedSuccessfully;
}
 

/**
    * 通过图片的网络地址来获取图片流--当前图片通过网络获取
 * Retrieves {@link InputStream} of image by URI (image is located in the network).
 *
 * @param imageUri Image URI
 * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
 *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
 * @return {@link InputStream} of image
 * @throws IOException if some I/O error occurs during network request or if no InputStream could be created for
 *                     URL.
 */
protected InputStream getStreamFromNetwork(String imageUri, Object extra) throws IOException {
	//创建网络连接
       HttpURLConnection conn = createConnection(imageUri, extra);
       //对于重定向进行判断判断，重定向的次数最大5次循环获取
	int redirectCount = 0;
	while (conn.getResponseCode() / 100 == 3 && redirectCount < MAX_REDIRECT_COUNT) {
		conn = createConnection(conn.getHeaderField("Location"), extra);
		redirectCount++;
	}
       //获取到图像流
	InputStream imageStream;
	try {
		imageStream = conn.getInputStream();
	} catch (IOException e) {
		// Read all data to allow reuse connection (http://bit.ly/1ad35PY)
		IoUtils.readAndCloseStream(conn.getErrorStream());
		throw e;
	}
	if (!shouldBeProcessed(conn)) {
		IoUtils.closeSilently(imageStream);
		throw new IOException("Image request failed with response code " + conn.getResponseCode());
	}
       //对图像流数据进行包装
	return new ContentLengthInputStream(new BufferedInputStream(imageStream, BUFFER_SIZE), conn.getContentLength());
}
 

/**
 * Retrieves {@link java.io.InputStream} of image by URI (image is located in the network).
 *
 * @param imageUri Image URI
 * @param extra    Auxiliary object which was passed to {@link com.nostra13.universalimageloader.core.DisplayImageOptions.Builder#extraForDownloader(Object)
 *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
 * @return {@link java.io.InputStream} of image
 * @throws java.io.IOException if some I/O error occurs during network request or if no InputStream could be created for
 *                     URL.
 */
protected InputStream getStreamFromNetwork(String imageUri, Object extra) throws IOException {
	HttpURLConnection conn = createConnection(imageUri, extra);

	int redirectCount = 0;
	while (conn.getResponseCode() / 100 == 3 && redirectCount < MAX_REDIRECT_COUNT) {
		conn = createConnection(conn.getHeaderField("Location"), extra);
		redirectCount++;
	}

	InputStream imageStream;
	try {
		imageStream = conn.getInputStream();
	} catch (IOException e) {
		// Read all data to allow reuse connection (http://bit.ly/1ad35PY)
		IoUtils.readAndCloseStream(conn.getErrorStream());
		throw e;
	}
	return new ContentLengthInputStream(new BufferedInputStream(imageStream, BUFFER_SIZE), conn.getContentLength());
}
 

@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
	File imageFile = getFile(imageUri);
	File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
	boolean loaded = false;
	try {
		OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
		try {
			loaded = IoUtils.copyStream(imageStream, os, listener, bufferSize);
		} finally {
			IoUtils.closeSilently(os);
		}
	} finally {
		IoUtils.closeSilently(imageStream);
		if (loaded && !tmpFile.renameTo(imageFile)) {
			loaded = false;
		}
		if (!loaded) {
			tmpFile.delete();
		}
	}
	return loaded;
}
 

@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
	File imageFile = getFile(imageUri);
	File tmpFile = new File(imageFile.getAbsolutePath() + TEMP_IMAGE_POSTFIX);
	OutputStream os = new BufferedOutputStream(new FileOutputStream(tmpFile), bufferSize);
	boolean savedSuccessfully = false;
	try {
		savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
	} finally {
		IoUtils.closeSilently(os);
		if (savedSuccessfully && !tmpFile.renameTo(imageFile)) {
			savedSuccessfully = false;
		}
		if (!savedSuccessfully) {
			tmpFile.delete();
		}
	}
	bitmap.recycle();
	return savedSuccessfully;
}
 

@Override
public boolean save(String imageUri, InputStream imageStream, IoUtils.CopyListener listener) throws IOException {
	DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
	if (editor == null) {
		return false;
	}

	OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
	boolean copied = false;
	try {
		copied = IoUtils.copyStream(imageStream, os, listener, bufferSize);
	} finally {
		IoUtils.closeSilently(os);
		if (copied) {
			editor.commit();
		} else {
			editor.abort();
		}
	}
	return copied;
}
 

@Override
public boolean save(String imageUri, Bitmap bitmap) throws IOException {
	DiskLruCache.Editor editor = cache.edit(getKey(imageUri));
	if (editor == null) {
		return false;
	}

	OutputStream os = new BufferedOutputStream(editor.newOutputStream(0), bufferSize);
	boolean savedSuccessfully = false;
	try {
		savedSuccessfully = bitmap.compress(compressFormat, compressQuality, os);
	} finally {
		IoUtils.closeSilently(os);
	}
	if (savedSuccessfully) {
		editor.commit();
	} else {
		editor.abort();
	}
	return savedSuccessfully;
}
 

/**
 * Decodes image from URI into {@link Bitmap}. Image is scaled close to incoming {@linkplain ImageSize target size}
 * during decoding (depend on incoming parameters).
 *
 * @param decodingInfo Needed data for decoding image
 * @return Decoded bitmap
 * @throws IOException                   if some I/O exception occurs during image reading
 * @throws UnsupportedOperationException if image URI has unsupported scheme(protocol)
 */
@Override
public Bitmap decode(ImageDecodingInfo decodingInfo) throws IOException {
	Bitmap decodedBitmap;
	ImageFileInfo imageInfo;

	InputStream imageStream = getImageStream(decodingInfo);
	try {
		imageInfo = defineImageSizeAndRotation(imageStream, decodingInfo);
		imageStream = resetStream(imageStream, decodingInfo);
		Options decodingOptions = prepareDecodingOptions(imageInfo.imageSize, decodingInfo);
		decodedBitmap = BitmapFactory.decodeStream(imageStream, null, decodingOptions);
	} finally {
		IoUtils.closeSilently(imageStream);
	}

	if (decodedBitmap == null) {
		L.e(ERROR_CANT_DECODE_IMAGE, decodingInfo.getImageKey());
	} else {
		decodedBitmap = considerExactScaleAndOrientatiton(decodedBitmap, decodingInfo, imageInfo.exif.rotation,
				imageInfo.exif.flipHorizontal);
	}
	return decodedBitmap;
}
 

/**
 * Retrieves {@link InputStream} of image by URI (image is located in the network).
 *
 * @param imageUri Image URI
 * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
 *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
 * @return {@link InputStream} of image
 * @throws IOException if some I/O error occurs during network request or if no InputStream could be created for
 *                     URL.
 */
protected InputStream getStreamFromNetwork(String imageUri, Object extra) throws IOException {
	HttpURLConnection conn = createConnection(imageUri, extra);

	int redirectCount = 0;
	while (conn.getResponseCode() / 100 == 3 && redirectCount < MAX_REDIRECT_COUNT) {
		conn = createConnection(conn.getHeaderField("Location"), extra);
		redirectCount++;
	}

	InputStream imageStream;
	try {
		imageStream = conn.getInputStream();
	} catch (IOException e) {
		// Read all data to allow reuse connection (http://bit.ly/1ad35PY)
		IoUtils.readAndCloseStream(conn.getErrorStream());
		throw e;
	}
	return new ContentLengthInputStream(new BufferedInputStream(imageStream, BUFFER_SIZE), conn.getContentLength());
}