小编new*_*ava的帖子

我正在尝试理解,当且仅当已创建3个或更多Jpeg对象时才调用compare方法.

目标是在将Jpeg时间戳添加到表之前按升序对其进行排序.

private class ExtractJpegMetadata extends Task {

    private File[] selectedJpegs;
    private Jpeg jpeg;

    public ExtractJpegMetadata(Application application, File[] selectedJpegs) {
        super(application);
        this.selectedJpegs = selectedJpegs;
    }

    @Override
    protected Object doInBackground() throws Exception {
        setMessage("Extracting jpeg metadata.");

        for (File file : selectedJpegs) {
            com.drew.metadata.Metadata metadata = ImageMetadataReader.readMetadata(file);
            // obtain the Exif directory
            ExifSubIFDDirectory directory = metadata.getDirectory(ExifSubIFDDirectory.class);
            jpeg = new Jpeg();
            jpeg.setImgTimestamp(directory.getDate(ExifSubIFDDirectory.TAG_DATETIME_ORIGINAL));

            Collections.sort(jpegList, jpeg);
            jpegList.add(jpeg);

        }

        jpegAlbum.setJpegAlbum(jpegList);         
        return null;
    }

    @Override
    protected void succeeded(Object result) {
        setMessage("Finished extracting jpeg …

我正在尝试从EUR/GBP 中获取EUR

$s = 'EUR/GBP'
preg_match('//', $s, $matches);
$s = $matches[0];