本文实例为大家分享了Android实现简易的音乐播放器,供大家参考,具体内容如下
功能介绍
本次实验实现的是使用Andriod Studio开发一个简易的音乐播放器,所包含的功能有音乐的播放、暂停、上一曲、下一曲、音乐播放的进度以及手动拖动来控制音乐的播放进度。
实现过程
导入项目所需的音乐文件、图标、背景等
1.创建一个raw文件夹,将音乐文件导入到这个文件夹中,方便我们在项目中使用
2.在drawable中导入所需的图片、图标
设计UI界面
1.设计5个button控件,分别对应上一曲,下一曲,暂停,播放,退出
2.设计3个TextView,分别对应歌曲的介绍信息、歌曲的进度(歌曲的总时间和歌曲当前播放的时间)、歌曲的名字
service服务的编写
创建一个MusicService对象继承Service
MusicService所需要的成员变量
MyReceiver serviceReceiver; Thread processThread; AssetManager am;//是附件管理器,用于根据文件名找到文件所在并打开文件 String[] musics = new String[]{"legendsneverdie.mp3", "promise.mp3", "beautiful.mp3"};//默认显示的歌曲信息 MediaPlayer mPlayer; // 当前的状态,0x11代表没有播放;0x12代表正在播放;0x13代表暂停 int status = 0x11; // 记录当前正在播放的音乐 int current = 0;
实现循环播放
public void onCreate() { super.onCreate(); am = getAssets(); // 创建BroadcastReceiver serviceReceiver = new MyReceiver(); // 创建IntentFilter IntentFilter filter = new IntentFilter(); filter.addAction(MainActivity.CTL_ACTION); registerReceiver(serviceReceiver, filter); // 创建MediaPlayer mPlayer = new MediaPlayer(); // 为MediaPlayer播放完成事件绑定监听器 mPlayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { Log.d("musicService", "播放完成"); current++; if (current >= 3) { current = 0; } // 准备并播放音乐 prepareAndPlay(musics[current]); //发送广播通知Activity更改文本框 Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION); sendIntent.putExtra("current", current); sendIntent.putExtra("currentTime", mPlayer.getCurrentPosition()); sendIntent.putExtra("totalTime", mPlayer.getDuration()); // 发送广播,将被Activity组件中的BroadcastReceiver接收到 sendBroadcast(sendIntent); } }); private void prepareAndPlay(String music) { try { // 打开指定音乐文件 AssetFileDescriptor afd = am.openFd(music); mPlayer.reset(); // 使用MediaPlayer加载指定的声音文件。 mPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength()); // 准备声音 mPlayer.prepare(); // 播放 mPlayer.start(); } catch (IOException e) { e.printStackTrace(); } }
实现刷新进度条
processThread = new Thread(new Runnable() { @Override public void run() { while (true) { if (status == 0x12) { try { Thread.sleep(1000); Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION); sendIntent.putExtra("current", current); sendIntent.putExtra("currentTime", mPlayer.getCurrentPosition()); sendIntent.putExtra("totalTime", mPlayer.getDuration()); // 发送广播,将被Activity组件中的BroadcastReceiver接收到 sendBroadcast(sendIntent); } catch (InterruptedException e) { e.printStackTrace(); } } } } }); processThread.start(); }
广播通信接收器的实现(用于实现和activity的通信)
public class MyReceiver extends BroadcastReceiver { @Override public void onReceive(final Context context, Intent intent) { int control = intent.getIntExtra("control", -1); Log.d("musicReceiver", "收到广播, control=" + control); switch (control) { // 播放或暂停 case 1: // 原来处于没有播放状态 if (status == 0x11) { // 准备并播放音乐 prepareAndPlay(musics[current]); status = 0x12; } // 原来处于播放状态 else if (status == 0x12) { // 暂停 mPlayer.pause(); // 改变为暂停状态 status = 0x13; } // 原来处于暂停状态 else if (status == 0x13) { // 播放 mPlayer.start(); // 改变状态 status = 0x12; } break; // 下一首 case 2: if (status == 0x12 || status == 0x13) { mPlayer.stop(); if (current + 1 >= musics.length) { current = 0; } else { current++; } prepareAndPlay(musics[current]); status = 0x12; break; } // 上一首 case 3: if (status == 0x12 || status == 0x13) { mPlayer.stop(); if (current - 1 < 0) { current = musics.length - 1; } else { current--; } prepareAndPlay(musics[current]); status = 0x12; } } // 广播通知Activity更改图标、文本框 Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION); sendIntent.putExtra("update", status); sendIntent.putExtra("current", current); // 发送广播,将被Activity组件中的BroadcastReceiver接收到 sendBroadcast(sendIntent); } }
activity的实现
初始化和动态绑定接收器
// 获取界面中显示歌曲标题、作者文本框 TextView title, author, currentTime, totalTime; // 播放/暂停、停止按钮 ImageButton play; ImageView lastMusic, nextMusic; // 进度条 ProgressBar progressBar; ActivityReceiver activityReceiver; public static final String CTL_ACTION = "org.xr.action.CTL_ACTION"; public static final String UPDATE_ACTION = "org.xr.action.UPDATE_ACTION"; // 定义音乐的播放状态,0x11代表没有播放;0x12代表正在播放;0x13代表暂停 int status = 0x11; String[] titleStrs = new String[]{"Legends Never Die", "约定", "美丽新世界"}; String[] authorStrs = new String[]{"英雄联盟", "周蕙", "伍佰"}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 获取程序界面界面中的两个按钮 play = (ImageButton) this.findViewById(R.id.play); lastMusic = this.findViewById(R.id.lastMusic); nextMusic = this.findViewById(R.id.nextMusic); title = (TextView) findViewById(R.id.title); author = (TextView) findViewById(R.id.author); currentTime = findViewById(R.id.currentTime); totalTime = findViewById(R.id.totalTime); progressBar = findViewById(R.id.progressBar); // 为两个按钮的单击事件添加监听器 play.setOnClickListener(this); lastMusic.setOnClickListener(this); nextMusic.setOnClickListener(this); activityReceiver = new ActivityReceiver(); // 创建IntentFilter IntentFilter filter = new IntentFilter(); // 指定BroadcastReceiver监听的Action filter.addAction(UPDATE_ACTION); // 注册BroadcastReceiver registerReceiver(activityReceiver, filter); Intent intent = new Intent(this, MusicService.class); // 启动后台Service startService(intent); }
设置activity的广播接收器(接收service发送过来的广播)
public void onReceive(Context context, Intent intent) { // 获取Intent中的update消息,update代表播放状态 int update = intent.getIntExtra("update", -1); // 获取Intent中的current消息,current代表当前正在播放的歌曲 int current = intent.getIntExtra("current", -1); int totalPosition = intent.getIntExtra("totalTime", -1); int currentPosition = intent.getIntExtra("currentTime", -1); Log.d("activityReceiver", "收到广播"); Log.d("activityReceiver", "current:" + current + " totalPosition:" + totalPosition + " currentPosition:" + currentPosition + " update:" + update); if (current >= 0) { title.setText(titleStrs[current]); author.setText(authorStrs[current]); } if (totalPosition >= 0) { SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss", Locale.CHINA); Date date = new Date(totalPosition); String formatTime = simpleDateFormat.format(date); totalTime.setText(formatTime); } if (currentPosition >= 0) { double process = ((double)currentPosition / totalPosition)*100; Log.d("activityReceiver", "当前进度:" + (double)currentPosition/totalPosition); SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss", Locale.CHINA); Date date = new Date(currentPosition); String formatTime = simpleDateFormat.format(date); progressBar.setProgress((int) process); currentTime.setText(formatTime); } switch (update) { case 0x11: play.setImageResource(R.drawable.play); status = 0x11; break; // 控制系统进入播放状态 case 0x12: // 播放状态下设置使用暂停图标 play.setImageResource(R.drawable.pause); // 设置当前状态 status = 0x12; break; // 控制系统进入暂停状态 case 0x13: // 暂停状态下设置使用播放图标 play.setImageResource(R.drawable.play); // 设置当前状态 status = 0x13; break; } }
实现图标的点击功能
// 创建Intent Intent intent = new Intent("org.xr.action.CTL_ACTION"); switch (source.getId()) { // 按下播放/暂停按钮 case R.id.play: intent.putExtra("control", 1); break; case R.id.lastMusic: intent.putExtra("control", 3); case R.id.nextMusic: intent.putExtra("control", 2); } // 发送广播,将被Service组件中的BroadcastReceiver接收到 sendBroadcast(intent); }
结果展示
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。