Android InputStream转Bitmap

android socket服务端 接收Delphi socket客户端发来的图片，保存到bitmap中，代码如下：

	public static Bitmap readInputStreamToBitmap(InputStream ins, int fileSize) {
	    if (ins == null) {
	        return null;
	    }
	    byte[] b;
	    ByteArrayOutputStream bos = new ByteArrayOutputStream();
	    try {
	        byte[] buffer = new byte[1024];
	        int size = -1;
	        int len = 0;// 已经接收长度
	        size = ins.read(buffer);
	        while (size != -1) {
	        	len = len + size;//
	            bos.write(buffer, 0, size);
	            if (fileSize == len) {// 接收完毕
			break;
		    }
		   size = ins.read(buffer);
	        }
	        b = bos.toByteArray();
	        bos.close();
	    } catch (IOException e) {
	        e.printStackTrace();
	        return null;
	    }
	    if (b.length != 0) {
            return BitmapFactory.decodeByteArray(b, 0, b.length);
        }
        return null;
	}