基于安卓开发的音乐播放器项目源码+项目说明（学霸课程设计）.zip

package com.example.musicplayer; import android.annotation.SuppressLint; import android.content.ComponentName; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.WindowManager; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ImageButton; import android.widget.ListView; import android.widget.SeekBar; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.appcompat.app.ActionBar; import androidx.appcompat.app.AppCompatActivity; import androidx.constraintlayout.widget.ConstraintLayout; import com.google.android.exoplayer2.Player; import java.io.IOException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.List; import java.util.Timer; import java.util.TimerTask; public class MainActivity extends AppCompatActivity { ActionBar actionBar; TextView tv_songName; TextView tv_seekBarHint; TextView tv_duration; SeekBar seekBar; ImageButton btn_play; ImageButton btn_pre; ImageButton btn_next; ImageButton btn_playList; ImageButton btn_playWay; ListView listView; ArrayAdapter<String> adpter; List<String> music_list = new ArrayList<>(); ConstraintLayout layout; MusicService musicService; private boolean isServiceBound = false; private Timer timer; //定时器 // 更新播放进度和歌曲总时长 private class ProgressUpdate extends TimerTask { @Override public void run() { runOnUiThread(new Runnable() { @Override public void run() { long position = musicService.getContentPosition(); long duration = musicService.getDuration(); // 更新当前进度文本 tv_seekBarHint.setText(format(position)); // 更新歌曲总时长文本 tv_duration.setText(format(duration)); // 更新进度条进度 seekBar.setMax((int) duration); seekBar.setProgress((int) position); } }); } } public String format(long position) { SimpleDateFormat sdf = new SimpleDateFormat("mm:ss"); // "分:秒"格式 String timeStr = sdf.format(position); //会自动将时长(毫秒数)转换为分秒格式 return timeStr; } // 绑定 MusicService private ServiceConnection serviceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { MusicService.LocalBinder binder = (MusicService.LocalBinder) service; musicService = binder.getService(); isServiceBound = true; } @Override public void onServiceDisconnected(ComponentName name) { musicService = null; isServiceBound = false; } }; View.OnClickListener listener1 = new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this, MusicService.class); switch (v.getId()) { case R.id.btn_playList: showListView(); break; case R.id.btn_play: playOrPauseMusic(); break; case R.id.btn_pre: playPreviousTrack(); break; case R.id.btn_next: playNextTrack(); break; case R.id.btn_playWay: changePlayMode(); break; } } }; // ListView 显示音乐列表 start public void showListView() { music_list = getMusic(); // 获取音乐列表 adpter = new ArrayAdapter<String>( // 创建适配器 MainActivity.this, android.R.layout.simple_list_item_single_choice, music_list ); listView.setAdapter(adpter); // 设置适配器 listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); // 设置选择模式 listView.setOnItemClickListener(listener2); // 设置监听器 listView.setVisibility(View.VISIBLE); // 设置可见 } List<String> getMusic() { List<String> mList = new ArrayList<>(); try { String[] fNames = getAssets().list("music"); for (String fn : fNames) { mList.add(fn); } } catch (IOException e) { throw new RuntimeException(e); } mList.add("返回"); return mList; } AdapterView.OnItemClickListener listener2 = new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { ListView lv = (ListView) parent; lv.setSelector(R.color.purple_200); //设置高亮背景色 purple_200颜色值见原来项目 String musicName = parent.getItemAtPosition(position).toString(); //获得选中项图片名称，需要toString if (musicName.equals("返回")) { // 获取ListView的布局参数 listView.setVisibility(View.GONE); } else { playMusic(musicName); } } }; public void playMusic(String musicName) { updateSongName(musicName); if (isServiceBound && musicService != null) { timer = new Timer(); timer.schedule(new ProgressUpdate(), 0, 1000); musicService.playMusic(musicName); btn_play.setImageResource(R.drawable.pause); } } // ListView 显示音乐列表 end public void playOrPauseMusic() { if (musicService.isPlaying()) { btn_play.setImageResource(R.drawable.play); musicService.pause(); } else { // 创建一个 Timer 对象，用于定时更新进度条和文本 timer = new Timer(); // 将 ProgressUpdate 任务调度到 Timer 中，每隔一定时间执行一次 timer.schedule(new ProgressUpdate(), 0, 1000); btn_play.setImageResource(R.drawable.pause); musicService.play(); String songName = musicService.getCurrentSongName(); updateSongName(songName); } } // 播放上一首音乐 public void playPreviousTrack() { if (isServiceBound && musicService != null) { timer = new Timer(); timer.schedule(new ProgressUpdate(), 0, 1000); btn_play.setImageResource(R.drawable.pause); musicService.playPreviousTrack(); String songName = musicService.getCurrentSongName(); updateSongName(songName); } } // 播放下一首音乐 public void playNextTrack() { if (isServiceBound && musicService != null) { timer = new Timer(); timer.schedule(new ProgressUpdate(), 0, 1000); btn_play.setImageResource(R.drawable.pause); musicService.playNextTrack(); String songName = musicService.getCurrentSongName(); updateSongName(songName); } } public void updateSongName(String songName) { // 去掉文件名后缀 songName = songName.substring(0, songName.lastIndexOf(".")); tv_songName.setText(songName); } // 更换播放模式 private void changePlayMode() { if (musicService != null) { int currentMode = musicService.getPlayMode(); if (currentMode == Player.REPEAT_MODE_ALL) { musicService.setPlayMode(Player.REPEAT_MODE_ONE);