我的布局中只有上一曲下一曲暂停播放按钮和listview，请根据这些组件重新编写Java代码

好的，根据您的描述，以下是一个简单的Java代码示例，实现了上一曲、下一曲、暂停和播放功能：

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

public class MainActivity extends Activity {

    private MediaPlayer mediaPlayer;
    private ListView listView;
    private Button prevButton;
    private Button nextButton;
    private Button playButton;
    private boolean isPlaying = false;

    private String[] songList = {"Song 1", "Song 2", "Song 3", "Song 4", "Song 5"};
    private int currentSongIndex = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Initialize the media player
        mediaPlayer = MediaPlayer.create(this, R.raw.song1);

        // Initialize the list view
        listView = findViewById(R.id.list_view);
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, songList);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
                currentSongIndex = position;
                playSong(songList[currentSongIndex]);
            }
        });

        // Initialize the buttons
        prevButton = findViewById(R.id.prev_button);
        nextButton = findViewById(R.id.next_button);
        playButton = findViewById(R.id.play_button);

        prevButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                currentSongIndex--;
                if (currentSongIndex < 0) {
                    currentSongIndex = songList.length - 1;
                }
                playSong(songList[currentSongIndex]);
            }
        });

        nextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                currentSongIndex++;
                if (currentSongIndex >= songList.length) {
                    currentSongIndex = 0;
                }
                playSong(songList[currentSongIndex]);
            }
        });

        playButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (isPlaying) {
                    pauseSong();
                } else {
                    playSong(songList[currentSongIndex]);
                }
            }
        });
    }

    private void playSong(String songName) {
        try {
            mediaPlayer.reset();
            int songResource = getResources().getIdentifier(songName.toLowerCase().replace(" ", "_"), "raw", getPackageName());
            mediaPlayer = MediaPlayer.create(this, songResource);
            mediaPlayer.start();
            isPlaying = true;
            playButton.setText("Pause");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void pauseSong() {
        if (mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
            isPlaying = false;
            playButton.setText("Play");
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mediaPlayer != null) {
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }
}

注意，这只是一个简单的例子，您需要根据您的实际需求进行修改和扩展。