Android将图像转换成流存储与将流转换成图像

骑猪看日落 2021-12-16 23:27 281阅读 0赞

1、将图片转换成二进制流

public byte[] getBitmapByte(Bitmap bitmap){  
        ByteArrayOutputStream out = new ByteArrayOutputStream();  
        //参数1转换类型，参数2压缩质量，参数3字节流资源
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);  
        try {  
            out.flush();  
            out.close();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return out.toByteArray();  
    }

2、将二进制流转换成图片（Bitmap）

public Bitmap getBitmapFromByte(byte[] temp){  
        if(temp != null){  
            Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0, temp.length);  
            return bitmap;  
        }else{  
            return null;  
        }  
    }

将二进制流转换成图片（Drawable）

public Drawable getBitmapFromByte(byte[] temp){  
        if(temp != null){  
            Drawable drawable = Drawable.createFromStream(bais, "image");
            return drawable ;  
        }else{  
            return null;  
        }  
    }

3、将Bitmap转换成Drawable

public static Bitmap drawableToBitmap(Drawable drawable){    
      
                int width = drawable.getIntrinsicWidth();    
      
                int height = drawable.getIntrinsicHeight();    
      
                Bitmap bitmap = Bitmap.createBitmap(width, height,    
      
                        drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888    
      
                                : Bitmap.Config.RGB_565);    
      
                Canvas canvas = new Canvas(bitmap);    
      
                drawable.setBounds(0,0,width,height);    
      
                drawable.draw(canvas);    
      
                return bitmap;    
      
                    
      
            }

或

Drawable drawable = new FastBitmapDrawable(bitmap);

或

BitmapDrawable tempDrawable = (BitmapDrawable) drawable;
    tempDrawable.getBitmap();

转载于:https://www.cnblogs.com/butterfly-clover/p/3981884.html