【发布时间】：2016-05-19 19:08:37
【问题描述】：
我正在寻求你的帮助。
我正在用 JavaFX 开发一个应用程序，它可以“扫描”Mp3 文件以获取 ID3tag。
这是我的问题。我为找到的每个 .mp3 做了一个列表的 foreach 循环，但我想增加一个标签来通知列表的进展。
这是我的代码
private ArrayList checkMp3File(ArrayList<String> lsMp3file, String sDir) throws UnsupportedTagException, InvalidDataException, IOException
{
this.currentData = 1;
int size = lsMp3file.size();
ArrayList<DataSong> lsds = new ArrayList<>();
for(String mp3file : lsMp3file)
{
this.labelUpdate.setText(this.current++ + " of " + " size");
DataSong ds = new DataSong();
Mp3File mp3 = new Mp3File(mp3file);
ds.setLenghtOfMp3inSec(mp3.getLengthInSeconds());
ds.setBitRateOfMp3(mp3.getBitrate());
ds.setSampleRate(mp3.getSampleRate());
ds.setVbrOrCbr(mp3.isVbr());
}
实际上，当循环进行时，我的窗口界面完全冻结。 只有当循环完成时，标签才会更新。 谁能解释一下原因？
我已经感谢你的回答了。
编辑：
这是我的完整代码
public class LaunchOption extends Pane {
private final HBox launchAndSend = new HBox();
private final HBox browseAndField = new HBox();
private final HBox jsonAndAdvance = new HBox();
private ArrayList<DataSong> lsWithData = new ArrayList<>();
private String sendJson;
private File selectedDirectory;
private User user;
private int currentData;
private final ProgressIndicator pi = new ProgressIndicator(0);
private final VBox containerElement = new VBox();
private final TextArea displayJson = new TextArea();
private final TextField pathDir = new TextField();
private final TextField nbrOfData = new TextField();
private final Button btnScan = new Button();
private final Button btnSend = new Button();
private final Button btnCheckJson = new Button();
private final Button btnDirectoryBrowser = new Button();
private final Label nbMp3 = new Label();
public Label listAdvance = new Label();
private final Stage home;
public LaunchOption(Stage home){
this.home = home;
configureBtnCheckJson();
configureBtnScan();
configureBtnSend();
configureLabelMp3();
configureBtnDirectoryBrowser();
configureTextAreaDisplayJson();
configureTextFieldPathDir();
configureTextFieldNbDataMp3();
configureHBoxlaunchSend();
configureHBoxBrowseAndField();
configureHBoxJsonAndAdvance();
configureContainer();
this.getChildren().addAll(containerElement,launchAndSend);
}
private void configureLabelMp3()
{
nbMp3.setText("MP3");
}
private void configureBtnScan(){
btnScan.setText("Scan");
btnScan.setOnAction(event->{
ArrayList<String> Mp3FileData;
Mp3FileData = mapFilesMp3(selectedDirectory.getAbsolutePath());
System.out.println("ListSize = " + Mp3FileData.size());
nbrOfData.setText(String.valueOf(Mp3FileData.size()));
try {
lsWithData = checkMp3File(Mp3FileData, selectedDirectory.getAbsolutePath());
} catch (UnsupportedTagException ex) {
Logger.getLogger(MusiScanMp3agic.class.getName()).log(Level.SEVERE, null, ex);
} catch (InvalidDataException ex) {
Logger.getLogger(MusiScanMp3agic.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(MusiScanMp3agic.class.getName()).log(Level.SEVERE, null, ex);
}
pi.setProgress(1);
});
}
private void configureBtnDirectoryBrowser(){
btnDirectoryBrowser.setText("Browse ...");
btnDirectoryBrowser.getStyleClass().add("round-red");
btnDirectoryBrowser.setOnAction(event-> {
DirectoryChooser dc = new DirectoryChooser();
selectedDirectory = dc.showDialog(home);
pi.setProgress(0.35);
if(selectedDirectory == null)
{
pathDir.setText("No directory selected");
}
else
{
pathDir.setText(selectedDirectory.getAbsolutePath());
String Text = pathDir.getText();
System.out.println(Text.toString());
}
});
}
private static String regexMp3()
{
return "^.*\\.(mp3)$";
}
private ArrayList mapFilesMp3(String sDir){
ArrayList<String> ls = new ArrayList<>();
printFnames(sDir,ls);
return ls;
}
private static void printFnames(String sDir, ArrayList<String> ls)
{
File[] faFiles = new File(sDir).listFiles();
for(File file : faFiles)
{
if(file.getName().matches(regexMp3()))
{
// System.out.println(file.getAbsolutePath());
ls.add(file.getAbsolutePath());
}
if(file.isDirectory())
{
printFnames(file.getAbsolutePath(), ls);
}
}
}
private ArrayList checkMp3File(ArrayList<String> lsMp3file, String sDir) throws UnsupportedTagException, InvalidDataException, IOException
{
this.currentData = 1;
int size = lsMp3file.size();
ArrayList<DataSong> lsds = new ArrayList<>();
for(String mp3file : lsMp3file)
{
System.out.println(this.currentData++);
DataSong ds = new DataSong();
Mp3File mp3 = new Mp3File(mp3file);
ds.setLenghtOfMp3inSec(mp3.getLengthInSeconds());
ds.setBitRateOfMp3(mp3.getBitrate());
ds.setSampleRate(mp3.getSampleRate());
ds.setVbrOrCbr(mp3.isVbr());
if(mp3 != null){
ds.setAbsoluteLocation(mp3.getFilename());
ds.setLocation(removeSDir(mp3.getFilename(), sDir));
if(mp3.hasId3v2Tag())
{
ID3v2 id3v2Tag = mp3.getId3v2Tag();
if(!(id3v2Tag.getArtist() == null))
{
ds.setArtist(id3v2Tag.getAlbumArtist());
}
if(!(id3v2Tag.getAlbum() == null))
{
ds.setAlbum((id3v2Tag.getAlbum()));
}
if(!(id3v2Tag.getTitle() == null))
{
ds.setTitle(id3v2Tag.getTitle());
}
if(!(id3v2Tag.getTrack() == null))
{
ds.setTrackOnAlbum(id3v2Tag.getTrack());
}
if(!(id3v2Tag.getYear() == null) && !(id3v2Tag.getYear().isEmpty()))
{
ds.setYearReleased(id3v2Tag.getYear());
}
if(!(id3v2Tag.getGenreDescription() == null))
{
ds.setGenre(id3v2Tag.getGenreDescription());
}
if(!(id3v2Tag.getComposer() == null))
{
ds.setComposer(id3v2Tag.getComposer());
}
if(!(id3v2Tag.getPublisher() == null))
{
ds.setPublisher(id3v2Tag.getPublisher());
}
if(!(id3v2Tag.getOriginalArtist() == null))
{
ds.setOriginArtist(id3v2Tag.getOriginalArtist());
}
if(!(id3v2Tag.getAlbumArtist() == null))
{
ds.setAlbumArtString(id3v2Tag.getAlbumArtist());
}
if(!(id3v2Tag.getCopyright() == null))
{
ds.setCopyright(id3v2Tag.getCopyright());
}
if(!(id3v2Tag.getUrl() == null))
{
ds.setUrl(id3v2Tag.getUrl());
}
}
}
lsds.add(ds);
}
return lsds;
}
我想我应该做的是把我的 checkMp3File 方法变成一个 Task 方法，它会做一个后台线程？
【问题讨论】：