一首接一首地播放 javafx

Question

我正在尝试从 DB 获取歌曲位置并一首接一首地播放，但在这里它播放了数据库中的最后一首歌曲并停止播放。我想播放第一首，然后播放第二首。

public  class FX_Musicplayer extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(final Stage stage) throws Exception {

        final ArrayList<String> list = new ArrayList<String>();

        try {
            Statement stmt = null;
            // connect to database radio
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/radio", "root", "");
            stmt=conn.createStatement();

                    String sql = "SELECT location FROM Request";
                    ResultSet rs = stmt.executeQuery(sql);

                     while(rs.next()) {
                        list.add(rs.getString(1));
                    }
        } catch (SQLException e1) {
            e1.printStackTrace();
        }

            for (int j = 0; j < 3; j++) {

                final Group root = new Group();
                String item = list.get(j);

                System.out.println(item);

                Media media = new Media(list.get(j));
                final MediaPlayer player = new MediaPlayer(media);
                MediaView view = new MediaView(player);

                root.getChildren().add(view);
                Scene scene = new Scene(root, 400, 400, Color.BLACK);
                stage.setScene(scene);
                stage.show();
                player.play();

            player.setOnEndOfMedia(new Runnable() {
                @Override public void run() 
                {       
                    player.stop();
                    return;
                }
                });

            }
    }
}

Answer 1

您的代码存在逻辑问题。您不只是更改媒体，而是尝试在循环中再次添加所有内容。循环只是为您重新构建所有内容，最后您只是播放最后一个媒体。您需要播放第一个，完成后，添加第二个，播放等等。

把for循环换成这一段美图

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.media.MediaView;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

public class Example extends Application {

    final MediaView view = new MediaView();
    Iterator<String> itr ;
    @Override
    public void start(Stage stage) throws Exception {
        final Group root = new Group();
        List<String> list = new ArrayList<String>();
        itr = list.iterator();
        //Plays the first file
        play(itr.next());
        root.getChildren().add(view);
        Scene scene = new Scene(root, 400, 400, Color.BLACK);
        stage.setScene(scene);
        stage.show();
    }
    public void play(String mediaFile){
        Media media = new Media(mediaFile);
        MediaPlayer player = new MediaPlayer(media);
        view.setMediaPlayer(player);
        player.play();
        player.setOnEndOfMedia(new Runnable() {
            @Override
            public void run() {
                player.stop();
                if (itr.hasNext()) {
                    //Plays the subsequent files
                    play(itr.next());
                }
                return;
            }
        });
    }
    public static void main(String[] args) {
        launch(args);
    }
}

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