Android Studio实现简单音乐播放功能的示例代码

项目要求

基于Broadcast，BroadcastReceiver等与广播相关的知识实现简单的音乐播放功能，包括音乐的播放、暂停、切换、进度选择、音量调整。

设计效果

（进度条时间刷新功能还没有实现）

实现思路

音乐服务端负责播放音乐和收发广播的功能。当音乐服务端作为接收器时，只能接收到主页面广播的控制消息；作为发送器时，向主页面发送歌曲信息更新的消息 主页面负责进度条以及音量按钮的监听，同时也有收发广播的功能。当主页面作为接收器时，只能接收到音乐服务端广播的歌曲信息更新的消息；作为发送器时，向音乐服务端发送对歌曲播放的控制消息。

项目结构图

主要代码

1 主页面

package com.example.dell.musicbox3;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.media.AudioManager;import android.os.Bundle;import android.view.View;import android.view.Window;import android.widget.ImageButton;import android.widget.SeekBar;import android.widget.TextView;public class MainActivity extends Activity implements View.OnClickListener{// 获取界面中显示歌曲标题、作者文本框TextView title, author;// 播放/暂停、停止按钮ImageButton play, next, last;// 声明音量管理器public AudioManager mAudioManager = null;// 定义进度条public static SeekBar audioSeekBar = null;// 定义音量大小public SeekBar audioVolume = null;ActivityReceiver activityReceiver;public static final String CTL_ACTION = 'org.crazyit.action.CTL_ACTION';public static final String UPDATE_ACTION = 'org.crazyit.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[] { '龙卷风', '可爱女人', '星晴' };String[] authorStrs = new String[] { 'JayChou', 'JayChou', 'JayChou' };@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.layout);// 获取程序界面界面中的两个按钮play = (ImageButton) this.findViewById(R.id.play);last = (ImageButton) this.findViewById(R.id.last);next = (ImageButton) this.findViewById(R.id.next);audioVolume = (SeekBar) findViewById(R.id.seekBar2);audioSeekBar = (SeekBar) findViewById(R.id.seekBar1);title = (TextView) findViewById(R.id.title);author = (TextView) findViewById(R.id.author);// 为两个按钮的单击事件添加监听器play.setOnClickListener(this);last.setOnClickListener(this);next.setOnClickListener(this);// 播放进度监听audioSeekBar.setOnSeekBarChangeListener(new SeekBarChangeEvent());// 退出后再次进去程序时，进度条保持持续更新if (MusicService.mPlayer != null) {// 设置进度条的最大值MainActivity.audioSeekBar.setMax(MusicService.mPlayer.getDuration());audioSeekBar.setProgress(MusicService.mPlayer.getCurrentPosition());}// 得到当前音量对象mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);// 把当前音量值赋给进度条audioVolume.setProgress(mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC));// 监听音量audioVolume.setOnSeekBarChangeListener(new AudioVolumeChangeEvent());activityReceiver = new ActivityReceiver();// 创建IntentFilterIntentFilter filter = new IntentFilter();// 指定BroadcastReceiver监听的Actionfilter.addAction(UPDATE_ACTION);// 注册BroadcastReceiverregisterReceiver(activityReceiver, filter);Intent intent = new Intent(this, MusicService.class);// 启动后台ServicestartService(intent);}// 音量监听class AudioVolumeChangeEvent implements SeekBar.OnSeekBarChangeListener {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, progress,0);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}}// 播放进度监听，别忘了Service里面还有个进度条刷新class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {// 假设改变源于用户拖动if (fromUser) {MusicService.mPlayer.seekTo(progress);// 当进度条的值改变时，音乐播放器从新的位置开始播放}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {MusicService.mPlayer.pause();}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {MusicService.mPlayer.start();}}// 自定义的BroadcastReceiver，负责监听从Service传回来的广播public class ActivityReceiver extends BroadcastReceiver{@Overridepublic 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);if (current >= 0){title.setText(titleStrs[current]);author.setText(authorStrs[current]);}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;}}}@Overridepublic void onClick(View source){// 创建IntentIntent intent = new Intent('org.crazyit.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.last:intent.putExtra('control', 2);break;//按下上一首按钮case R.id.next:intent.putExtra('control', 3);break;}// 发送广播，将被Service组件中的BroadcastReceiver接收到sendBroadcast(intent);}}

2 音乐服务端

package com.example.dell.musicbox3;import java.io.IOException;import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.res.AssetFileDescriptor;import android.content.res.AssetManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.IBinder;public class MusicService extends Service implements Runnable{MyReceiver serviceReceiver;//asset文件管理对象AssetManager am;String[] musics = new String[] { '周杰?? - 龙卷风.mp3', '周杰?? - 星晴.mp3', '周杰?? - 可爱女人.mp3' };public static 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;@Override//非绑定式服务public IBinder onBind(Intent intent){return null;}@Override//定义初始化函数public void onCreate(){super.onCreate();//获取asset文件夹里的所有歌曲am = getAssets();// 创建具有筛选功能的服务端接收器serviceReceiver = new MyReceiver();// 创建IntentFilter过滤器IntentFilter filter = new IntentFilter();//使音乐服务端的接收器只能接收客户端发来的CTL_ACTION消息filter.addAction(MainActivity.CTL_ACTION);//注册带有此筛选器且名字叫做serviceReceiver的接收器registerReceiver(serviceReceiver, filter);// 创建MediaPlayermPlayer = new MediaPlayer();// 为MediaPlayer播放完成事件绑定监听器mPlayer.setOnCompletionListener(new OnCompletionListener() // ①{@Overridepublic void onCompletion(MediaPlayer mp){current++;if (current >= 3){current = 0;}//发送广播通知Activity更改文本框Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);sendIntent.putExtra('current', current);// 发送广播，将被Activity组件中的BroadcastReceiver接收到sendBroadcast(sendIntent);// 准备并播放音乐prepareAndPlay(musics[current]);}});}public class MyReceiver extends BroadcastReceiver{@Overridepublic void onReceive(final Context context, Intent intent){int control = intent.getIntExtra('control', -1);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;// 停止声音case 2://上一首切换if (current <= 0) {//停止播放mPlayer.stop();//修改currentcurrent = musics.length-1;//播放prepareAndPlay(musics[current]);status = 0x12;}else{mPlayer.stop();current--;prepareAndPlay(musics[current]);status = 0x12;}break;//下一首切换case 3:if (current >= 2) {mPlayer.stop();current = 0;prepareAndPlay(musics[current]);status = 0x12;}else{mPlayer.stop();current++;prepareAndPlay(musics[current]);status = 0x12;}break;}// 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);}}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();// 设置进度条最大值MainActivity.audioSeekBar.setMax(MusicService.mPlayer.getDuration());new Thread(this).start();} catch (IOException e) {e.printStackTrace();}}// 刷新进度条public void run() {int CurrentPosition = 0;int total = mPlayer.getDuration();while (mPlayer != null && CurrentPosition < total) {try {Thread.sleep(1000);if (mPlayer != null) {CurrentPosition = mPlayer.getCurrentPosition();}} catch (InterruptedException e) {e.printStackTrace();}MainActivity.audioSeekBar.setProgress(CurrentPosition);}}}

仓库链接

MusicBox

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