/**
	 * 获取网络图片
	 * 注意权限:
	 * <uses-permission android:name="android.permission.INTERNET"/>
	 */
	private Bitmap getBitmapFromNetWork(String imageUrl){
		URL url=null;
		Bitmap bitmap=null;
		InputStream inputStream=null;
		HttpURLConnection httpURLConnection=null;
		ByteArrayOutputStream byteArrayOutputStream=null;
		try {
			url=new URL(imageUrl);
			httpURLConnection=(HttpURLConnection) url.openConnection();
			httpURLConnection.setConnectTimeout(5*1000);
			httpURLConnection.setReadTimeout(10*1000);
			httpURLConnection.setDoInput(true);
			httpURLConnection.setDoOutput(true);
			if (httpURLConnection.getResponseCode()==HttpStatus.SC_OK) {
				inputStream=httpURLConnection.getInputStream();
				byteArrayOutputStream=new ByteArrayOutputStream();
				int len=0;
				byte [] buffer=new byte[1024];
				while((len=inputStream.read(buffer))!=-1){
					byteArrayOutputStream.write(buffer, 0, len);
					byteArrayOutputStream.flush();
				}
				byte [] imageData=http://www.mamicode.com/byteArrayOutputStream.toByteArray();>