的通過添加偵聽器來讀取媒體源元數據的其他方式是在mediaplayer .setOnReady()中提取該信息;這裏是java控制器類
公共類uiController實現Initializable {
@FXML private Label label;
@FXML private ListView<String> lv;
@FXML private AnchorPane root;
@FXML private Button button;
private ObservableList<String> ol= FXCollections.observableArrayList();
private List<File> selectedFiles;
private final Object obj= new Object();
@Override
public void initialize(URL url, ResourceBundle rb) {
assert button != null : "fx:id=\"button\" was not injected: check your FXML file 'ui.fxml'.";
assert label != null : "fx:id=\"label\" was not injected: check your FXML file 'ui.fxml'.";
assert lv != null : "fx:id=\"lv\" was not injected: check your FXML file 'ui.fxml'.";
assert root != null : "fx:id=\"root\" was not injected: check your FXML file 'ui.fxml'.";
// initialize your logic here: all @FXML variables will have been injected
lv.setItems(ol);
}
@FXML private void open(ActionEvent event) {
FileChooser.ExtensionFilter extention= new FileChooser.ExtensionFilter("Music Files", "*.mp3","*.m4a","*.aif","*.wav","*.m3u","*.m3u8");
FileChooser fc= new FileChooser();
fc.setInitialDirectory(new File(System.getenv("userprofile")));
fc.setTitle("Select File(s)");
fc.getExtensionFilters().add(extention);
selectedFiles =fc.showOpenMultipleDialog(root.getScene().getWindow());
if(selectedFiles != null &&!selectedFiles.isEmpty()){
listFiles();
}
}
/**
* Convert each fie selected to its URI
*/
private void listFiles(){
try {
for (File file : selectedFiles) {
readMetaData(file.toURI().toString());
synchronized(obj){
obj.wait(100);
}
}
} catch (InterruptedException ex) {
}
System.gc();
}
/**
* Read a Media source metadata
* Note: Sometimes the was unable to extract the metadata especially when
* i have selected large number of files reasons i don't known why
* @param mediaURI Media file URI
*/
private void readMetaData(String mediaURI){
final MediaPlayer mp= new MediaPlayer(new Media(mediaURI));
mp.setOnReady(new Runnable() {
@Override
public void run() {
String artistName=(String) mp.getMedia().getMetadata().get("artist");
ol.add(artistName);
synchronized(obj){//this is required since mp.setOnReady creates a new thread and our loopp in the main thread
obj.notify();// the loop has to wait unitl we are able to get the media metadata thats why use .wait() and .notify() to synce the two threads(main thread and MediaPlayer thread)
}
}
});
}
}的例子部分
,都使得使用了ObservableList到藝術家的名字從元數據存儲的一些變化
在代碼中,你會發現這
synchronized(obj){
obj.wait(100);
}
我這樣做是因爲mediaplayer .setOnReady()創建一個新的線程和循環是在主應用程序線程,循環必須等待一段時間才能創建其他線程,並且我們能夠提取元數據,並且在.setOnReady()中有一個喚醒主線程的循環,因此循環是能夠移動到下一個項目
我承認這可能不是最好的解決方案,但歡迎任何誰有更好的方法如何從文件列表中讀取JavaFx媒體元數據 完整Netbeans項目可以在這裏找到https://docs.google.com/file/d/0BxDEmOcXqnCLSTFHbTVFcGIzT1E/edit?usp=sharing
plus已經創建了一個使用JavaFX的小型MediaPlayer應用程序,該應用程序展示了元數據的使用https://docs.google.com/file/d/0BxDEmOcXqnCLR1Z0VGN4ZlJkbUU/edit?usp=sharing