学步园

转载文章请注明出处：http://write.blog.csdn.net/postedit/13092669

android 通过UrlConnection 或者HttpConnection 访问网络读取图片当下读取量过多或者过大时，就会出现部分的乱码。附下图：

关键处是：public boolean compress (Bitmap.CompressFormat format,
int quality, OutputStream stream)方法。

android api 给的讲解是：

Write
a compressed version of the bitmap to the specified outputstream. If this returns true, the bitmap can be reconstructed by passing a corresponding inputstream to BitmapFactory.decodeStream(). Note: not all Formats support all bitmap configs directly, so it
is possible that the returned bitmap from BitmapFactory could be in a different bitdepth, and/or may have lost per-pixel alpha (e.g. JPEG only supports opaque pixels).

原来的代码：

HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream fileIn = url.openStream();		
OutputStream output=new FileOutputStream(imagefile);
byte[] buffer=new byte[1024];
while (fileIn.read(buffer)!=-1) 
{
	output.write(buffer);
}
output.close();
fileIn.close();

其实没有什么思路，就是简单的输入输出。

修改后的代码：

URL url = new URL(reader.getImageUrl(i));
							
InputStream is = url.openStream();
bitmap = BitmapFactory.decodeStream(is);
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream(imagefile));
bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos);
bos.flush();
bos.close();
is.close();

转载文章请注明出处：http://write.blog.csdn.net/postedit/13092669