我使用以下代码调整大小并将文件保存到blackberry设备中。在图像缩放后,我尝试将图像文件写入设备。但它提供了相同的数据。 (图像的高度和宽度相同)。我必须重新缩放图像文件。任何人都可以帮我???
类ResizeImage扩展MainScreen实现了FieldChangeListener
{
private String path =“file:///SDCard/BlackBerry/pictures/test.jpg”;
私人ButtonField btn;
ResizeImage()
{
btn = new ButtonField(“Write File”);
btn.setChangeListener(本);
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();
// byte 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");
}
}
}
答案 0 :(得分:0)
在EncodedImage中查看getScaledHeight()和getScaledWidth()。
这是一个肮脏的RIM技巧。
如果使用具有有效getHeight()和getWidth()的getBitmap()剥离位图。
然后,如果您想将该缩放图像保存为jpeg,则需要重新编码。
e.g。
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,预售5.0,至少没有原生的in-jpeg缩放,无需转换为位图。