android中使用Bit地图Factory的decodeStream()方法解码图片失败有关问题

android中使用BitmapFactory的decodeStream()方法解码图片失败问题

转载自：http://www.cnblogs.com/yourancao520/archive/2012/06/25/2561367.html

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之前从网上获取图片并保存到Sd卡中是用的BitmapFactory的decodeStream()方法,在2.3版及以上版本下没有问题,但是底于2.3的版本就会出问题.

代码debug的时候不出问题,但是直接运行就是出错,从网上查了查,有的说是网速不太好的情况下,会获取不了图片,有的说是低版本的API上会出现解码问题

之前的代码 (BitmapFactory.decodeStream):

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Bitmap?bitmapFact?=??BitmapFactory.decodeStream(getImageStream(picUrl));
saveFile(bitmapFact,?pic.getPicName(),
pic.getModifyTime());

????/**
?????*?从网络上获取图片,并返回输入流
?????*?
?????*?@param?path
?????*????????????图片的完整地址
?????*?@return?InputStream
?????*?@throws?Exception
?????*/
????public?InputStream?getImageStream(String?path)?throws?Exception?{
????????URL?url?=?new?URL(path);
????????HttpURLConnection?conn?=?(HttpURLConnection)url.openConnection();
????????conn.setReadTimeout(10?*?1000);
????????conn.setConnectTimeout(10?*?1000);
????????conn.setRequestMethod("GET");
????????if?(conn.getResponseCode()?==?HttpURLConnection.HTTP_OK)?{
????????????return?conn.getInputStream();
????????}
????????return?null;
????}

/**
?????*?保存文件
?????*?
?????*?@param?bm
?????*????????????位图
?????*?@param?fileName
?????*????????????文件名
?????*?@param?modifyTime
?????*????????????修改时间
?????*?@throws?IOException
?????*/
????public?void?saveFile(Bitmap?bm,?String?fileName,?String?modifyTime)
????????????throws?IOException?{
????????File?myCaptureFile?=?new?File(ALBUM_PATH?+?fileName);//?创建文件
????????BufferedOutputStream?bos?=?new?BufferedOutputStream(
????????????????new?FileOutputStream(myCaptureFile));
????????bm.compress(Bitmap.CompressFormat.JPEG,?80,?bos);
????????bos.flush();
????????bos.close();

????}

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修改之后的 (BitmapFactory.decodeByteArray):

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Bitmap?bitmapFact?=??this.getImage(picUrl);
saveFile(bitmapFact,?pic.getPicName(),pic.getModifyTime());

public?Bitmap?getImage(String?path)?throws?Exception?{
????????URL?url?=?new?URL(path);
????????HttpURLConnection?conn?=?(HttpURLConnection)url.openConnection();
????????conn.setReadTimeout(10?*?1000);
????????conn.setConnectTimeout(10?*?1000);
????????conn.setRequestMethod("GET");
????????InputStream?is?=?null;
????????if(conn.getResponseCode()?==?HttpURLConnection.HTTP_OK)?{
????????????is?=?conn.getInputStream();
????????}?else?{
????????????is?=?null;
????????}
????????if?(is?==?null){
????????????throw?new?RuntimeException("stream?is?null");
????????}?else?{
????????????try?{
????????????????byte[]?data=readStream(is);
????????????????if(data!=null){
????????????????????Bitmap?bitmap?=?BitmapFactory.decodeByteArray(data,?0,?data.length);
????????????????????return?bitmap;
????????????????}
????????????}?catch?(Exception?e)?{
????????????????e.printStackTrace();
????????????}
????????????is.close();
????????????return?null;
????????}
????}

/*
?????*?得到图片字节流?数组大小
?????*?*/
????public?static?byte[]?readStream(InputStream?inStream)?throws?Exception{??????
????????ByteArrayOutputStream?outStream?=?new?ByteArrayOutputStream();??????
????????byte[]?buffer?=?new?byte[1024];??????
????????int?len?=?0;??????
????????while(?(len=inStream.read(buffer))?!=?-1){??????
????????????outStream.write(buffer,?0,?len);??????
????????}??????
????????outStream.close();??????
????????inStream.close();??????
????????return?outStream.toByteArray();??????
????}