Android Studio课程设计音乐播放器 代码

以下是一个简单的Android Studio课程设计音乐播放器的代码示例：

XML布局文件：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/controller"
        android:layout_marginBottom="10dp"
        android:divider="@null"
        android:listSelector="@drawable/list_selector" />

    <RelativeLayout
        android:id="@+id/controller"
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:layout_alignParentBottom="true"
        android:background="#DDDDDD"
        android:padding="10dp">

        <ImageView
            android:id="@+id/prevBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_skip_previous_black_36dp"
            android:layout_centerVertical="true"
            android:layout_alignParentLeft="true"
            android:layout_marginRight="20dp"/>

        <ImageView
            android:id="@+id/playBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_play_arrow_black_36dp"
            android:layout_centerInParent="true"/>

        <ImageView
            android:id="@+id/nextBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_skip_next_black_36dp"
            android:layout_centerVertical="true"
            android:layout_alignParentRight="true"
            android:layout_marginLeft="20dp"/>

        <TextView
            android:id="@+id/titleView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Title"
            android:textSize="18sp"
            android:textColor="#333333"
            android:layout_centerInParent="true"
            android:layout_toLeftOf="@id/nextBtn"
            android:layout_toRightOf="@id/prevBtn"/>

    </RelativeLayout>

</RelativeLayout>

Java代码：

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private ImageView prevBtn, playBtn, nextBtn;
    private TextView titleView;

    private MediaPlayer mediaPlayer;
    private int currentSongIndex = 0;
    private boolean isPlaying = false;

    private ArrayList<String> songList = new ArrayList<>();

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

        // 初始化控件
        listView = findViewById(R.id.listView);
        prevBtn = findViewById(R.id.prevBtn);
        playBtn = findViewById(R.id.playBtn);
        nextBtn = findViewById(R.id.nextBtn);
        titleView = findViewById(R.id.titleView);

        // 添加音乐文件到列表
        songList.add("song1.mp3");
        songList.add("song2.mp3");
        songList.add("song3.mp3");

        // 设置ListView适配器
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
                R.layout.list_item, R.id.songName, songList);
        listView.setAdapter(adapter);

        // ListView点击事件处理
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                currentSongIndex = position;
                playSong();
            }
        });

        // 播放按钮点击事件处理
        playBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isPlaying) {
                    pauseSong();
                } else {
                    playSong();
                }
            }
        });

        // 上一首按钮点击事件处理
        prevBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (currentSongIndex > 0) {
                    currentSongIndex--;
                    playSong();
                }
            }
        });

        // 下一首按钮点击事件处理
        nextBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (currentSongIndex < songList.size() - 1) {
                    currentSongIndex++;
                    playSong();
                }
            }
        });

        // 初始化MediaPlayer
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

        // 设置MediaPlayer监听器
        mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                mp.start();
                isPlaying = true;
                playBtn.setImageResource(R.drawable.ic_pause_black_36dp);
                titleView.setText(songList.get(currentSongIndex));
            }
        });

        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                isPlaying = false;
                playBtn.setImageResource(R.drawable.ic_play_arrow_black_36dp);
            }
        });
    }

    // 播放音乐
    private void playSong() {
        try {
            mediaPlayer.reset();
            AssetFileDescriptor afd = getAssets().openFd(songList.get(currentSongIndex));
            mediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
            mediaPlayer.prepareAsync();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 暂停音乐
    private void pauseSong() {
        if (mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
            isPlaying = false;
            playBtn.setImageResource(R.drawable.ic_play_arrow_black_36dp);
        }
    }

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

这是一个简单的音乐播放器示例，仅供参考。您可以根据自己的需求进行更改和扩展。