Android第八讲——多媒体(一) 音乐播放器
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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：
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(); } } } }} 0 0
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