Bitmap对图像进行Base64编解码

public String bitmaptoString(Bitmap bitmap) {  
        // 将Bitmap转换成字符串  
        String string = null;  
        ByteArrayOutputStream bStream = new ByteArrayOutputStream();  
        bitmap.compress(CompressFormat.PNG, 100, bStream);  
        byte[] bytes = bStream.toByteArray();  
        string = Base64.encodeToString(bytes, Base64.DEFAULT);  
        return string;  
}  

public Bitmap stringtoBitmap(String string) {  
          // 将字符串转换成Bitmap类型  
          Bitmap bitmap = null;  
          try {  
                byte[] bitmapArray;  
                bitmapArray = Base64.decode(string, Base64.DEFAULT);  
                bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0,  
                bitmapArray.length);  
                } catch (Exception e) {  
                        e.printStackTrace();  
                }  
                return bitmap;  
        }  

来自为知笔记(Wiz)