我正在使用以下代码调整大小并将文件保存到BlackBerry设备中。图像刻度之后,我尝试将图像文件写入设备。但是它提供了相同的数据。 (图像的高度和宽度是相同的)。我必须制作恢复的图像文件。有人可以帮助我吗???

class resizeImage扩展了mainscreen实施fieldchangelistener {private string path =“ file:///sdcard/blackberry/pictures/pictures/test.jpg”;私人Buttonfield BTN; resizeImage(){btn = new buttonfield(“ write file”); btn.setchangelistener(this);添加(BTN); } public void fieldchanged(field field,int context){if(field == btn){尝试{
InputStream InputStream = null; //获取文件连接fileConnection fileConnection =(fileConnection)connector.open(path); if(fileconnection.exists()){inputStream = fileconnection.openinputStream(); //字节data [] = inputStream.toString()。getBytes();

                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    int j = 0;
                    while((j=inputStream.read()) != -1) {
                    baos.write(j);
                    }
                    byte data[] = baos.toByteArray();                
                    inputStream.close();
                    fileConnection.close();  

                    WriteFile("file:///SDCard/BlackBerry/pictures/org_Image.jpg",data);           


                    EncodedImage  eImage = EncodedImage.createEncodedImage(data,0,data.length);                               
                    int scaleFactorX = Fixed32.div(Fixed32.toFP(eImage.getWidth()), Fixed32.toFP(80));
                    int scaleFactorY = Fixed32.div(Fixed32.toFP(eImage.getHeight()), Fixed32.toFP(80));
                    eImage=eImage.scaleImage32(scaleFactorX, scaleFactorY);   

                    WriteFile("file:///SDCard/BlackBerry/pictures/resize.jpg",eImage.getData());

                    BitmapField bit=new BitmapField(eImage.getBitmap());                       
                    add(bit);

                }       
            }
            catch(Exception e)
            {
                System.out.println("Exception is ==> "+e.getMessage());
            }

        }
   }


   void WriteFile(String fileName,byte[] data)
   {
       FileConnection fconn = null;
        try
        {
            fconn = (FileConnection) Connector.open(fileName,Connector.READ_WRITE);
        } 
        catch (IOException e) 
        {
            System.out.print("Error opening file");
        }

        if (fconn.exists())
        try 
        {
            fconn.delete();
        }
        catch (IOException e)
        {
            System.out.print("Error deleting file");
        }
        try 
        {
            fconn.create();
        }
        catch (IOException e) 
        {
            System.out.print("Error creating file");
        }
        OutputStream out = null;
        try
        {
            out = fconn.openOutputStream();
        } 
        catch (IOException e) {
            System.out.print("Error opening output stream");
        }

        try 
        {
            out.write(data);
        }
        catch (IOException e) {
            System.out.print("Error writing to output stream");
        }

        try
        {
            fconn.close();
        } 
        catch (IOException e) {
            System.out.print("Error closing file");
        }
    }

}

有帮助吗?

解决方案

在编码图中查看getScaledHeight()和getScaledWidth()。

这是一个肮脏的边缘技巧。

如果将getBitMap()剥离,将具有有效的Getheight()和getWidth()。

然后,如果要将缩放图像保存为JPEG,则需要重新编写。

例如

Bitmap scaledBMP = scaledEI.getBitmap();
JPEGEncodedImage finalJPEG = JPEGEncodedImage.encode(scaledBMP, 80); // int arg is quality
raw_media_bytes = finalJPEG.getData();
raw_length = finalJPEG.getLength();
raw_offset = finalJPEG.getOffset();

// don't forget to use the length and offset info, because getData() is
// not guaranteed to work by itself.

Afaik,至少没有天然的jpeg缩放量表,没有转换为位图。

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