Android将图像转换成流存储与将流转换成图像

//take the image to byte[]
byte[] byteIcon = userIcon;

                    //将字节数组即头像从二进制流转换成drawable
                    if(byteIcon != null){
                        
                        ByteArrayInputStream bais = new ByteArrayInputStream(byteIcon);
                        
                        userIconDrawable = Drawable.createFromStream(bais, "image");
                        
                    }





BitMap userIcon;


        //将bitmap转换成drawable
        ByteArrayOutputStream os = new ByteArrayOutputStream();
　　　　//参数1转换类型，参数2压缩质量，参数3字节流资源        

　　　　　　userIcon.compress(CompressFormat.PNG, 100, os);

//将Drawable 转成bitmap
BitmapDrawable tempDrawable = (BitmapDrawable) DrawableImage;
tempDrawable.getBitmap();