Java : Play List of Tracks In Android MediaPlayer

Question

我正在尝试在 Android Studio 中使用 MediaPlayer 播放轨道列表。这是一个音乐应用程序，有播放、暂停和下一步按钮。我可以使用媒体播放器循环播放一首歌曲，但我就是不知道如何使用下一首按钮转到下一首轨道。

如果有人可以帮助我使用 Java 代码在 Android Studio 中使用媒体播放器播放轨道列表，我会很高兴。

非常感谢!

Answer 1

从SD卡读取MP3文件的类

This class will read all the files from device sdcard and filters the files which are having .mp3 extension.

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.HashMap;

public class SongsManager {
    // SDCard Path
    final String MEDIA_PATH = new String("/sdcard/");
    private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();

    // Constructor
    public SongsManager(){

    }

    /**
     * Function to read all mp3 files from sdcard
     * and store the details in ArrayList
     * */
    public ArrayList<HashMap<String, String>> getPlayList(){
        File home = new File(MEDIA_PATH);

        if (home.listFiles(new FileExtensionFilter()).length > 0) {
            for (File file : home.listFiles(new FileExtensionFilter())) {
                HashMap<String, String> song = new HashMap<String, String>();
                song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4)));
                song.put("songPath", file.getPath());

                // Adding each song to SongList
                songsList.add(song);
            }
        }
        // return songs list array
        return songsList;
    }

    /**
     * Class to filter files which are having .mp3 extension
     * */
    class FileExtensionFilter implements FilenameFilter {
        public boolean accept(File dir, String name) {
            return (name.endsWith(".mp3") || name.endsWith(".MP3"));
        }
    }
}

检索歌曲播放列表

SongsManager songManager;
ArrayList<HashMap<String, String>> playList = new ArrayList<HashMap<String, String>>();
playList = songManager.getPlayList();

the playList object can be used to play individual songs, using a ListView or etc

public void  playSong(int songIndex){
    // Play song
    try {
        mp.reset();
        mp.setDataSource(songsList.get(songIndex).get("songPath"));
        mp.prepare();
        mp.start();
        // Displaying Song title
        String songTitle = songsList.get(songIndex).get("songTitle");
        songTitleLabel.setText(songTitle);

        // Changing Button Image to pause image
        btnPlay.setImageResource(R.drawable.btn_pause);

        // set Progress bar values
        songProgressBar.setProgress(0);
        songProgressBar.setMax(100);

        // Updating progress bar
        updateProgressBar();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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在此之前彻底了解 Android Media Player API docs

有关更详细的说明，请使用此 Link

希望对您有所帮助:)