Android第八讲——多媒体(一) 音乐播放器

时间：2022-05-26 03:20:13

Android第八讲——多媒体(一) 音乐播放器
使用MediaPlayer对音频、视频操作：
如何获得MediaPlayer的对象
可以使用直接new的方式：
MediaPlayer mp = new MediaPlayer();
也可以使用create的方式，如：
MediaPlayer mp = MediaPlayer.create(this, R.raw.test);//这时就不用调用setDataSource了

音乐播放器

搭建主界面
现在AndroidManifest中添加权限
< uses-permission android:name=”android.permission.READ_EXTERNAL_STORAGE” />
xml中包括展示歌曲内容的ListView、进度条SeekBar、歌曲当前时间、歌曲总时间以及暂停/播放、上一曲、下一曲

<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity"
android:background="@mipmap/guide_background">
<ListView
 android:id="@+id/listview_music"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">

</ListView>

<LinearLayout
 android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
 android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<TextView
 android:id="@+id/textview_music_currentposition"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00:00"
android:textColor="@android:color/darker_gray"
 />
<SeekBar
 android:id="@+id/seekbar_music"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView
 android:id="@+id/textview_music_duration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00:00"
android:textColor="@android:color/darker_gray"
android:layout_alignParentRight="true"/>
</LinearLayout>
<LinearLayout
 android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<ImageView
 android:layout_width="40dp"
android:layout_height="40dp"
 />
<ImageView
 android:id="@+id/imageview_music_play_prev"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_marginRight="10dp"
android:src="@mipmap/img_appwidget_play_prev"/>
<ImageView
 android:id="@+id/imageview_music_playorpause"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@mipmap/img_appwidget_play"/>
<ImageView
 android:id="@+id/imageview_music_play_next"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_marginLeft="10dp"
android:src="@mipmap/img_appwidget_play_next"/>
</LinearLayout>

</LinearLayout>

</LinearLayout>

给每首歌曲设置布局格式 item_music_listview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<LinearLayout
 android:id="@+id/linearlayout_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<!-- 歌曲图片，暂时缺省，使用默认-->
<ImageView
 android:id="@+id/imageview_music"
android:layout_width="70dp"
android:layout_height="70dp"
android:src="@mipmap/img_background_appwidget91_default"/>
<LinearLayout
 android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
 android:id="@+id/textview_music_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="7dp"
android:layout_marginLeft="10dp"
android:text="歌曲名"
android:textSize="18sp"/>
<!-- 艺术家、暂时缺省-->
<TextView
 android:id="@+id/textview_music_artist"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:layout_marginLeft="10dp"
android:text=""/>

</LinearLayout>

</LinearLayout>

</LinearLayout>

创建一个歌曲类 MyMusic
类中包含歌曲的名称，歌曲的路径

/**
 * 歌曲类
 * Created by Went_Gone on 2015/9/10.
 */
public class MyMusic {
    private String musicName;
    private String path;

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    public String getMusicName() {
        return musicName;
    }

    public void setMusicName(String musicName) {
        this.musicName = musicName;
    }
    MediaMetadataRetriever mmr;
    public MyMusic(String path) {
        File file = new File(path);
        musicName = file.getName();
    }
}

在MianActivity中先遍历Music中所有的音乐，将其添加到ListView中(此时需要Adapter)

mMyMusics = new ArrayList<>();//初始化
initMusic();
        mMusicAdapter = new MusicAdapter(mMyMusics, getLayoutInflater());
        mListView.setAdapter(mMusicAdapter);

    private void initMusic() {
        File sdcard = Environment.getExternalStorageDirectory();//找到手机Sdcard
        File music = new File(sdcard, "/Music");//拼音乐所在的文件夹
        musics = music.listFiles();//遍历音乐文件夹中的文件
        for (File musicl : musics){
            Log.d("Music",musicl.getAbsolutePath());
            MyMusic myMusic = new MyMusic(musicl.getAbsolutePath());
            mMyMusics.add(myMusic);
        }
    }

创建一个ListView 的Adapter MusicAdapter.java

/**
 * Created by Went_Gone on 2015/9/10.
 */
public class MusicAdapter extends BaseAdapter {
    private List<MyMusic> myMusics;
    private LayoutInflater mInflater;
    private String[] title;

    public MusicAdapter(List<MyMusic> myMusics, LayoutInflater mInflater) {
        this.myMusics = myMusics;
        this.mInflater = mInflater;
    }

    @Override

    public int getCount() {
        return myMusics.size();
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        MyMusic myMusic = myMusics.get(position);
        ViewHolder vh = null;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.item_music_listview, null);
            vh = new ViewHolder();
            vh.textViewMusicName = (TextView) convertView.findViewById(R.id.textview_music_name);
            vh.imageViewMusic = (ImageView) convertView.findViewById(R.id.imageview_music);
            vh.textViewMusicArtist = (TextView) convertView.findViewById(R.id.textview_music_artist);
            convertView.setTag(vh);
        }
        vh = (ViewHolder) convertView.getTag();
        vh.textViewMusicName.setText(myMusic.getMusicName());
        vh.imageViewMusic.setImageResource(R.mipmap.img_background_appwidget91_default);
        return convertView;
    }

    class ViewHolder {
        TextView textViewMusicName;
        ImageView imageViewMusic;
        TextView textViewMusicArtist;
    }
}

此时布局以及音乐都加载到了主界面上，接下来就是让音乐播放了
音乐该怎么播放呢，通过上边一开始的图可以知道大体步骤，先重置，找到要播放的音乐，准备，播放。我们不可能在播放的时候永远打开着界面，如果音乐播放的线程放在UI线程中，假使我们关闭主界面，音乐的线程很可能会被关闭掉。所以我们要尽可能不要让其关闭，所以我们将音乐播放的线程放在“Service（服务）”中去。另外，给ListView添加一个item点击事件，使得点击某首音乐时播放。
关于setOnItemClickListener 现在点击某一首音乐后，向MusicService中发送一个Intent，内部有音乐当前类型(是播放还是暂停还是上、下一曲)由MusicService进行解析判断

 mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(getApplicationContext(), MusicService.class);
                intent.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_NEW_START);
                intent.putExtra(Config.MUSIC_NAME, musics[position].getAbsolutePath());
                musicPosition = position;
                startService(intent);
                mImageViewPlay.setImageResource(R.mipmap.img_appwidget_pause);
            }
        });

MusicService中复写方法。要开一个线程，用来给UI线程发送广播，以便于将音乐的进度赋值给进度条。
MusicService中复写方法。要开一个线程，用来给UI线程发送广播，以便于将音乐的进度赋值给进度条。

    class MyMusicThread extends Thread{
        @Override
        public void run() {
            while(player.isPlaying()) {
                int currentPosition = player.getCurrentPosition();//得到当前音乐当前播放的时间

                //给Activity发送广播，以便于seekBar设置当前进度
                Intent intent = new Intent(Config.REGISTER_RECEIVER);
                intent.putExtra(Config.TYPE, Config.MUSIC_CURRENT);
                intent.putExtra(Config.CURRENTPOSITIO, currentPosition);
                sendBroadcast(intent);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }

MainActivity中接收广播，用于设置SeekBar的值和音乐总时间及当前播放到的时间

 class MyMusicReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
            int type = intent.getIntExtra(Config.TYPE,0);
            switch (type){
                case Config.MUSIC_DURATION:
                    int duration = intent.getIntExtra(Config.DURATION,0);
                    mSeekBar.setMax(duration);
                    SimpleDateFormat format = new SimpleDateFormat("mm:ss");
                    String time = format.format(new Date(duration));
                    mTextViewDuration.setText(""+time);
                    break;
                case Config.MUSIC_CURRENT:
                    int current = intent.getIntExtra(Config.CURRENTPOSITIO,0);
                    mSeekBar.setProgress(current);
                    SimpleDateFormat format1 = new SimpleDateFormat("mm:ss");
                    String time1 = format1.format(new Date(current));
                    mTextViewCurrent.setText(""+time1);
                    break;
                case Config.MUSIC_PAUSE:
                    mImageViewPlay.setImageResource(R.mipmap.img_appwidget_play);
                    break;
                case Config.MUSIC_START:
                    mImageViewPlay.setImageResource(R.mipmap.img_appwidget_pause);
                    break;
                default:
                    break;
            }
        }
    }

现在点击某一首音乐后，向MusicService中发送一个Intent，内部有音乐当前类型(是播放还是暂停还是上、下一曲)由MusicService进行解析判断
MusicService中的onStartCommand方法中
首先解析是哪种类型

int type = intent.getIntExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_NEW_START);
 case Config.MUSIC_NEW_START:
            //开始播放一首音乐
                startNewMusic(intent);
                break;

    /**
     * 开始一首新音乐
     * @param intent Activity传过来的Intent
     */
    private void startNewMusic(Intent intent) {
        String musicPath = intent.getStringExtra(Config.MUSIC_NAME);
        if (player == null) {
            player = new MediaPlayer();
        }
        player.reset();
        try {
            player.setDataSource(musicPath);
            player.prepare();
        } catch (IOException e) {
            e.printStackTrace();
        }
        player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                mp.start();

                int duration = player.getDuration();//得到当前音乐的总时长
                Intent intent = new Intent(Config.REGISTER_RECEIVER);
                intent.putExtra(Config.TYPE, Config.MUSIC_DURATION);
                intent.putExtra(Config.DURATION,duration);
                sendBroadcast(intent);

                MyMusicThread musicThread = new MyMusicThread();
                musicThread.start();//开启线程为了实时传递歌曲播放进度

            }
        });
    }

当音乐播放时就需要有时暂停，有时播放
在Activity中通过点击向Service发送一个Intent，包含类型（暂停/播放）

            case R.id.imageview_music_playorpause:
                Intent intent = new Intent(getApplicationContext(),MusicService.class);
                intent.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_PAUSE_OR_START);
                startService(intent);
                break;

在Service中解析类型，在通过判断歌曲是否在播放。

1>如果在播放那么将它暂停，并且发送给Activity一个广播，将暂停/播放的图片重置一下。

2>如果是暂停的，难么放它播放，并且要讲设置SeekBar的线程开起来。

            case Config.MUSIC_PAUSE_OR_START:
                //暂停或者播放
                startOrPauseMusic();
                break;

    /**
     * 开始或暂停一首歌曲
     */
    private void startOrPauseMusic() {
        if (player!=null){
            if (player.isPlaying()){
                player.pause();
                Intent intent1 = new Intent(Config.REGISTER_RECEIVER);
                intent1.putExtra(Config.TYPE,Config.MUSIC_PAUSE);
                sendBroadcast(intent1);
            }else {
                player.start();
                Intent intent1 = new Intent(Config.REGISTER_RECEIVER);
                intent1.putExtra(Config.TYPE,Config.MUSIC_START);
                sendBroadcast(intent1);
                MyMusicThread thread = new MyMusicThread();
                thread.start();
            }
        }
    }

只是暂停或播放是不够的，我们设置了进度条，能够显示歌曲的进度，那么如果我们想通过进度条设置歌曲进度怎么办呢？
此时就需要在Seekbar上添加事件监听，当滑动SeekBar后，给Service发送一个Intent将滑动的位置传递过去，让歌曲在此位置上播放
首先是SeekBar

        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }
            //当手机滑动结束并离开屏幕时
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                Intent intent = new Intent(getApplicationContext(),MusicService.class);
                intent.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_SEEK_TO);
                intent.putExtra(Config.PROGRESS,mSeekBar.getProgress());
                startService(intent);
            }
        });

然后Service，解析类型

            case Config.MUSIC_SEEK_TO:
                int progress = intent.getIntExtra(Config.PROGRESS,0);
                if (player!=null) {
                    player.seekTo(progress);//将歌曲移动到进度条所显示的进度上
                }
                break;

我们平时用的音乐播放器是不是还有上、下一首呀
我们将上下一首也添加上去，这时我们就需要分类了。
1.如果我们点击了上一首该怎么办？

            case R.id.imageview_music_play_prev:
                //当点击上一首按钮时
                Intent intent1 = new Intent(getApplicationContext(),MusicService.class);
                intent1.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_PREV);
                if (musicPosition!=0) {
                    intent1.putExtra(Config.MUSIC_NAME, musics[musicPosition-1].getAbsolutePath());
                    musicPosition--;
                }else {
                    //如果当前播放音乐在第一首，那么在点击上一首就会跳转到最后一首
                    musicPosition = musics.length;
                    intent1.putExtra(Config.MUSIC_NAME, musics[musicPosition-1].getAbsolutePath());
                    musicPosition--;
                }
                startService(intent1);

2.当点击下一首时

            case R.id.imageview_music_play_next:
                //当点击下一首时
                Intent intent2 = new Intent(getApplicationContext(),MusicService.class);
                intent2.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_NEXT);
                if (musicPosition!=musics.length-1) {
                    intent2.putExtra(Config.MUSIC_NAME, musics[musicPosition+1].getAbsolutePath());
                    musicPosition++;
                }else {
                    //如果当前播放音乐在最后一首，那么在点击下一首就会跳转到第一首
                    musicPosition = 0;
                    intent2.putExtra(Config.MUSIC_NAME, musics[musicPosition].getAbsolutePath());
                    musicPosition++;
                }
                startService(intent2);

Activity将Intent传递到Service上，Service通过解析判断是上一首还是下一首

            case Config.MUSIC_PREV:
                //播放上一首
                if (player!=null){
                    startNewMusic(intent);
                }
                break;
            case Config.MUSIC_NEXT:
                //播放下一首
                if (player!=null){
                    startNewMusic(intent);
                }
                break;

好啦，现在一个简易的音乐播放器就做好了。后边我们还可以加入更多的功能，像随机播放啦、顺序播放啦…
运行如图：Android第八讲——多媒体(一) 音乐播放器

完整代码：
activity_main.xml

<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity"
android:background="@mipmap/guide_background">
<ListView
 android:id="@+id/listview_music"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1">

</ListView>

<LinearLayout
 android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
 android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<TextView
 android:id="@+id/textview_music_currentposition"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00:00"
android:textColor="@android:color/darker_gray"
 />
<SeekBar
 android:id="@+id/seekbar_music"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView
 android:id="@+id/textview_music_duration"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="00:00"
android:textColor="@android:color/darker_gray"
android:layout_alignParentRight="true"/>
</LinearLayout>
<LinearLayout
 android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<ImageView
 android:layout_width="40dp"
android:layout_height="40dp"
 />
<ImageView
 android:id="@+id/imageview_music_play_prev"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_marginRight="10dp"
android:src="@mipmap/img_appwidget_play_prev"/>
<ImageView
 android:id="@+id/imageview_music_playorpause"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@mipmap/img_appwidget_play"/>
<ImageView
 android:id="@+id/imageview_music_play_next"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_marginLeft="10dp"
android:src="@mipmap/img_appwidget_play_next"/>
</LinearLayout>

</LinearLayout>

</LinearLayout>

item_music_listview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<LinearLayout
 android:id="@+id/linearlayout_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<!-- 歌曲图片，暂时缺省，使用默认-->
<ImageView
 android:id="@+id/imageview_music"
android:layout_width="70dp"
android:layout_height="70dp"
android:src="@mipmap/img_background_appwidget91_default"/>
<LinearLayout
 android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
 android:id="@+id/textview_music_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="7dp"
android:layout_marginLeft="10dp"
android:text="歌曲名"
android:textSize="18sp"/>
<!-- 艺术家、暂时缺省-->
<TextView
 android:id="@+id/textview_music_artist"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:layout_marginLeft="10dp"
android:text=""/>

</LinearLayout>

</LinearLayout>

</LinearLayout>

MyMusic.java 音乐类

/**
 * 歌曲类
 * Created by Went_Gone on 2015/9/10.
 */
public class MyMusic {
    private String musicName;
    private String path;

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    public String getMusicName() {
        return musicName;
    }

    public void setMusicName(String musicName) {
        this.musicName = musicName;
    }

    MediaMetadataRetriever mmr;
    public MyMusic(String path) {
        this.path = path;
        File file = new File(path);
        musicName = file.getName();
    }
}

MainActivity.java 主Activity

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private File[] musics;
    private List<MyMusic> mMyMusics;
    private ListView mListView;
    private MusicAdapter mMusicAdapter;
    private SeekBar mSeekBar;
    private MyMusicReceiver mReceiver;
    private TextView mTextViewDuration;
    private TextView mTextViewCurrent;
    private ImageView mImageViewPlay;
    private ImageView mImageViewPlayPrev;
    private ImageView mImageViewPlayNext;
    private int musicPosition = 0;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mListView = (ListView) findViewById(R.id.listview_music);
        mSeekBar = (SeekBar) findViewById(R.id.seekbar_music);
        mImageViewPlay = (ImageView) findViewById(R.id.imageview_music_playorpause);
        mTextViewDuration = (TextView) findViewById(R.id.textview_music_duration);
        mTextViewCurrent = (TextView) findViewById(R.id.textview_music_currentposition);
        mImageViewPlayPrev = (ImageView) findViewById(R.id.imageview_music_play_prev);
        mImageViewPlayNext = (ImageView) findViewById(R.id.imageview_music_play_next);
        mImageViewPlay.setOnClickListener(this);
        mImageViewPlayPrev.setOnClickListener(this);
        mImageViewPlayNext.setOnClickListener(this);

        mMyMusics = new ArrayList<>();//初始化
        initMusic();

        mMusicAdapter = new MusicAdapter(mMyMusics, getLayoutInflater());
        mListView.setAdapter(mMusicAdapter);
        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(getApplicationContext(), MusicService.class);
                intent.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_NEW_START);
                intent.putExtra(Config.MUSIC_NAME, musics[position].getAbsolutePath());
                musicPosition = position;
                startService(intent);
                mImageViewPlay.setImageResource(R.mipmap.img_appwidget_pause);
            }
        });

        //注册广播
        mReceiver = new MyMusicReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(Config.REGISTER_RECEIVER);
        registerReceiver(mReceiver, filter);

        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }
            //当手机滑动结束并离开屏幕时
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                Intent intent = new Intent(getApplicationContext(),MusicService.class);
                intent.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_SEEK_TO);
                intent.putExtra(Config.PROGRESS,mSeekBar.getProgress());
                startService(intent);
            }
        });
    }

    private void initMusic() {
        File sdcard = Environment.getExternalStorageDirectory();//找到手机Sdcard
        File music = new File(sdcard, "/Music");//拼音乐所在的文件夹
        musics = music.listFiles();//遍历音乐文件夹中的文件
        for (File musicl : musics){
            Log.d("Music",musicl.getAbsolutePath());
            MyMusic myMusic = new MyMusic(musicl.getAbsolutePath());
            mMyMusics.add(myMusic);
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.imageview_music_playorpause:
                Intent intent = new Intent(getApplicationContext(),MusicService.class);
                intent.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_PAUSE_OR_START);
                startService(intent);
                break;
            case R.id.imageview_music_play_prev:
                //当点击上一首按钮时
                Intent intent1 = new Intent(getApplicationContext(),MusicService.class);
                intent1.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_PREV);
                if (musicPosition!=0) {
                    intent1.putExtra(Config.MUSIC_NAME, musics[musicPosition-1].getAbsolutePath());
                    musicPosition--;
                }else {
                    //如果当前播放音乐在第一首，那么在点击上一首就会跳转到最后一首
                    musicPosition = musics.length;
                    intent1.putExtra(Config.MUSIC_NAME, musics[musicPosition-1].getAbsolutePath());
                    musicPosition--;
                }
                startService(intent1);
                break;
            case R.id.imageview_music_play_next:
                //当点击下一首时
                Intent intent2 = new Intent(getApplicationContext(),MusicService.class);
                intent2.putExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_NEXT);
                if (musicPosition!=musics.length-1) {
                    intent2.putExtra(Config.MUSIC_NAME, musics[musicPosition+1].getAbsolutePath());
                    musicPosition++;
                }else {
                    //如果当前播放音乐在最后一首，那么在点击下一首就会跳转到第一首
                    musicPosition = 0;
                    intent2.putExtra(Config.MUSIC_NAME, musics[musicPosition].getAbsolutePath());
                    musicPosition++;
                }
                startService(intent2);
                break;
            default:
                break;
        }
    }

    class MyMusicReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
            int type = intent.getIntExtra(Config.TYPE,0);
            switch (type){
                case Config.MUSIC_DURATION:
                    int duration = intent.getIntExtra(Config.DURATION,0);
                    mSeekBar.setMax(duration);
                    SimpleDateFormat format = new SimpleDateFormat("mm:ss");
                    String time = format.format(new Date(duration));
                    mTextViewDuration.setText(""+time);
                    break;
                case Config.MUSIC_CURRENT:
                    int current = intent.getIntExtra(Config.CURRENTPOSITIO,0);
                    mSeekBar.setProgress(current);
                    SimpleDateFormat format1 = new SimpleDateFormat("mm:ss");
                    String time1 = format1.format(new Date(current));
                    mTextViewCurrent.setText(""+time1);
                    break;
                case Config.MUSIC_PAUSE:
                    mImageViewPlay.setImageResource(R.mipmap.img_appwidget_play);
                    break;
                case Config.MUSIC_START:
                    mImageViewPlay.setImageResource(R.mipmap.img_appwidget_pause);
                    break;
                default:
                    break;
            }
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mReceiver);
    }
}

MusicAdapter ListView的Adapter

/**
 * Created by Went_Gone on 2015/9/10.
 */
public class MusicAdapter extends BaseAdapter {
    private List<MyMusic> myMusics;
    private LayoutInflater mInflater;
    private String[] title;

    public MusicAdapter(List<MyMusic> myMusics, LayoutInflater mInflater) {
        this.myMusics = myMusics;
        this.mInflater = mInflater;
    }

    @Override

    public int getCount() {
        return myMusics.size();
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        MyMusic myMusic = myMusics.get(position);
        ViewHolder vh = null;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.item_music_listview, null);
            vh = new ViewHolder();
            vh.linearLayoutItme = (LinearLayout) convertView.findViewById(R.id.linearlayout_item);
            vh.textViewMusicName = (TextView) convertView.findViewById(R.id.textview_music_name);
            vh.imageViewMusic = (ImageView) convertView.findViewById(R.id.imageview_music);
            vh.textViewMusicArtist = (TextView) convertView.findViewById(R.id.textview_music_artist);
            convertView.setTag(vh);
        }
        vh = (ViewHolder) convertView.getTag();
        vh.textViewMusicName.setText(myMusic.getMusicName());
        vh.imageViewMusic.setImageResource(R.mipmap.img_background_appwidget91_default);
        return convertView;
    }

    class ViewHolder {
        TextView textViewMusicName;
        ImageView imageViewMusic;
        TextView textViewMusicArtist;
        LinearLayout linearLayoutItme;
    }
}

MusicService.java Service（后台服务）

/**
 * Created by Went_Gone on 2015/9/10.
 */
public class MusicService extends Service {
    private MediaPlayer player;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        int type = intent.getIntExtra(Config.MUSIC_STATE_TYPE,Config.MUSIC_NEW_START);
        switch (type){
            case Config.MUSIC_NEW_START:
            //开始播放一首音乐
                startNewMusic(intent);
                break;
            case Config.MUSIC_SEEK_TO:
                int progress = intent.getIntExtra(Config.PROGRESS,0);
                if (player!=null) {
                    player.seekTo(progress);//将歌曲移动到进度条所显示的进度上
                }
                break;
            case Config.MUSIC_PAUSE_OR_START:
                //暂停或者播放
                startOrPauseMusic();
                break;
            case Config.MUSIC_PREV:
                //播放上一首
                if (player!=null){
                    startNewMusic(intent);
                }
                break;
            case Config.MUSIC_NEXT:
                //播放下一首
                if (player!=null){
                    startNewMusic(intent);
                }
                break;
            default:
                break;
        }
        return super.onStartCommand(intent, flags, startId);
    }

    /**
     * 开始或暂停一首歌曲
     */
    private void startOrPauseMusic() {
        if (player!=null){
            if (player.isPlaying()){
                player.pause();
                Intent intent1 = new Intent(Config.REGISTER_RECEIVER);
                intent1.putExtra(Config.TYPE,Config.MUSIC_PAUSE);
                sendBroadcast(intent1);
            }else {
                player.start();
                Intent intent1 = new Intent(Config.REGISTER_RECEIVER);
                intent1.putExtra(Config.TYPE,Config.MUSIC_START);
                sendBroadcast(intent1);
                MyMusicThread thread = new MyMusicThread();
                thread.start();
            }
        }
    }

    /**
     * 开始一首新音乐
     * @param intent Activity传过来的Intent
     */
    private void startNewMusic(Intent intent) {
        String musicPath = intent.getStringExtra(Config.MUSIC_NAME);
        if (player == null) {
            player = new MediaPlayer();
        }
        player.reset();
        try {
            player.setDataSource(musicPath);
            player.prepare();
        } catch (IOException e) {
            e.printStackTrace();
        }
        player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                mp.start();

                int duration = player.getDuration();//得到当前音乐的总时长
                Intent intent = new Intent(Config.REGISTER_RECEIVER);
                intent.putExtra(Config.TYPE, Config.MUSIC_DURATION);
                intent.putExtra(Config.DURATION,duration);
                sendBroadcast(intent);

                MyMusicThread musicThread = new MyMusicThread();
                musicThread.start();

            }
        });
    }

    class MyMusicThread extends Thread{
        @Override
        public void run() {
            while(player.isPlaying()) {
                int currentPosition = player.getCurrentPosition();//得到当前音乐当前播放的时间

                //给Activity发送广播，以便于seekBar设置当前进度
                Intent intent = new Intent(Config.REGISTER_RECEIVER);
                intent.putExtra(Config.TYPE, Config.MUSIC_CURRENT);
                intent.putExtra(Config.CURRENTPOSITIO, currentPosition);
                sendBroadcast(intent);
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
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