Android的MP3播放器播放歌曲列表

private class SongDetails { 
     String songTitle = ""; 
     String songArtist = ""; 
     //song location on the device 
     String songData = ""; 
}

函數將所有媒體文件標記爲mp3並將它們添加到arra Ÿ

private void getAllSongs() 
    { 
     //creating selection for the database 
     String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0"; 
     final String[] projection = new String[] { 
       MediaStore.Audio.Media.DISPLAY_NAME, 
       MediaStore.Audio.Media.ARTIST, 
       MediaStore.Audio.Media.DATA}; 

     //creating sort by for database 
     final String sortOrder = MediaStore.Audio.AudioColumns.TITLE 
       + " COLLATE LOCALIZED ASC"; 

     //stating pointer 
     Cursor cursor = null; 

     try { 
      //the table for query 
      Uri uri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; 
      // query the db 
      cursor = getBaseContext().getContentResolver().query(uri, 
        projection, selection, null, sortOrder); 
      if (cursor != null) { 

       //create array for incoming songs 
       songs = new ArrayList<SongDetails>(cursor.getCount()); 

       //go to the first row 
       cursor.moveToFirst(); 

       SongDetails details; 

       while (!cursor.isAfterLast()) { 
        //collecting song information and store in array, 
        //moving to the next row 
        details = new SongDetails(); 
        details.songTitle = cursor.getString(0); 
        details.songArtist = cursor.getString(1); 
        details.songData = cursor.getString(2); 
        songs.add(details); 
        cursor.moveToNext(); 

       } 
      } 
     } catch (Exception ex) { 

     } finally { 
      if (cursor != null) { 
       cursor.close(); 
      } 
     } 
    }

玩家和活動

public interface OnPlayerEventListener { 
    void onPlayerComplete(); 
    void onPlayerStart(String Title,int songDuration,int songPosition); 
}

類代表的媒體播放器

public class simplePlayer 
{ 
    OnPlayerEventListener mListener; 
    Activity mActivity; 

    //give access to the gui 
    public ArrayList<songDetails> songs = null; 
    public boolean isPaused = false; 
    public int currentPosition = 0; 
    public int currentDuration = 0; 

    //single instance 
    public static MediaPlayer player; 

    //getting gui player interface 
    public simplePlayer(Activity ma) 
    { 
     mActivity = ma; 
     mListener = (OnPlayerEventListener) mActivity; 
    } 

    //initialize the player 
    public void init(ArrayList<songDetails>_songs) 
    { 
     songs = _songs; 
     currentPosition = 0; 


     if(player == null) 
     { 
      player = new MediaPlayer(); 
      player.setAudioStreamType(AudioManager.STREAM_MUSIC); 
      player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { 
       @Override 
       public void onCompletion(MediaPlayer mp) { 

        player.stop(); 
        player.reset(); 

        nextSong(); 
        mListener.onPlayerSongComplete(); 

       } 
      }); 
     } 
    } 

    //stop the current song 
    public void stop() 
    { 
     if(player != null) 
     { 
      if(player.isPlaying()) 
       //stop music 
       player.stop(); 

      //reset pointer 
      player.reset(); 
     } 
    } 

    //pause the current song 
    public void pause() 
    { 
     if(!isPaused && player != null) 
     { 
      player.pause(); 
      isPaused = true; 
     } 
    } 

    //playing the current song 
    public void play() 
    { 
     if(player != null) 
     { 
      if(!isPaused && !player.isPlaying()) 
      { 
       if(songs != null) 
       { 
        if(songs.size() > 0) 
        { 
         try { 
          //getting file path from data 
          Uri u = Uri.fromFile(new File(songs.get(currentPosition).songData)); 

          //set player file 
          player.setDataSource(mActivity,u); 
          //loading the file 
          player.prepare(); 
          //getting song total time in milliseconds 
          currentDuration = player.getDuration(); 

          //start playing music! 
          player.start(); 
          mListener.onPlayerSongStart("Now Playing: " 
            + songs.get(currentPosition).songArtist 
            + " - "+ songs.get(currentPosition).songTitle 
            ,currentDuration,currentPosition); 
         } 
         catch (Exception ex) 
         { 
          ex.printStackTrace(); 
         } 
        } 
       } 
       else 
       { 
        //continue playing, reset the flag 
        player.start(); 
        isPaused = false; 
       } 
      } 
     } 
    } 

    //playing the next song in the array 
    public void nextSong() 
    { 
     if(player != null) 
     { 
      if(isPaused) 
       isPaused = false; 

      if(player.isPlaying()) 
       player.stop(); 

      player.reset(); 

      if((currentPosition + 1) == songs.size()) 
       currentPosition = 0; 
      else 
       currentPosition = currentPosition + 1; 

      play(); 
     } 
    } 

    //playing the previous song in the array 
    public void previousSong() 
    { 
     if(player != null) 
     { 
      if(isPaused) 
       isPaused = false; 

      if(player.isPlaying()) 
       player.stop(); 

      player.reset(); 

      if(currentPosition - 1 < 0) 
       currentPosition = songs.size(); 
      else 
       currentPosition = currentPosition -1; 

      play(); 
     } 
    } 

    //getting new position for playing by the gui seek bar 
    public void setSeekPosition(int msec) 
    { 
     if(player != null) 
      player.seekTo(msec); 
    } 

    //getting the current duration of music 
    public int getSeekPosition() 
    { 
     if(player != null) 
      return player.getDuration(); 
     else 
      return -1; 
    } 
}

類的主要代表活動

public class MainActivity extends ActionBarActivity 
implements OnPlayerEventListener { 

simplePlayer player; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    //getting all songs in the device 
    getAllSongs(); 

    if (player == null) { 
     //create new instance and send the listener 
     player = new simplePlayer(this); 
     //initialize the simplePlayer 
     player.init(songs); 
     //start playing the first song 
     player.play(); 

     seekBar.setMax(player.currentDuration); 
    } 
} 

@Override 
public void onPlayerSongComplete() { 
//need to be implement! 
} 

@Override 
public void onPlayerSongStart(String Title, int songDuration, int songPosition) { 
    this.setTitle(Title); 
    seekBar.setMax(songDuration); 
    seekBar.setProgress(0); 
} 
}

好運之間

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來源

2015-06-19 22:03:48 Proxytype

Android的MP3播放器播放歌曲列表

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