Android音乐播放器

Question

我正在制作一个音乐播放器应用程序，我有两个不同的片段，分别用于SongsList (SongList.java)和Mediaplayer控件(即包含播放和暂停按钮的Mediaplayer.java )。现在，我想将我的SongsList.java连接到Mediaplayer.java。我想从SongsList.java中选择一首在Mediaplayer.java中播放的歌曲。我该怎么办？请帮帮我！

SongList.java

 import android.app.Fragment;
 import android.content.ContentResolver;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ListView;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;

 public class Songlist extends Fragment {
 private ArrayList<Song> songList;
 private ListView songView;


 @Override
 public View onCreateView(LayoutInflater inflater,
                     ViewGroup container, Bundle savedInstanceState) {

//Inflate the layout for this fragment
View view=inflater.inflate(
        R.layout.songs, container, false);
songView = (ListView)view.findViewById(R.id.song_list);

songList = new ArrayList<Song>();
getSongList();
Collections.sort(songList, new Comparator<Song>() {
    public int compare(Song a, Song b) {
        return a.getTitle().compareTo(b.getTitle());
    }
});
SongAdapter songAdt = new SongAdapter(getActivity(), songList);
songView.setAdapter(songAdt);

songView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            ///////////////////WHAT TO DO HERE!//////////////////
        }
    });

return view;
}

public void getSongList() {
//retrieve song info
ContentResolver musicResolver = getActivity().getContentResolver();
Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);
if(musicCursor!=null && musicCursor.moveToFirst()){
    //get columns
    int titleColumn = musicCursor.getColumnIndex
            (android.provider.MediaStore.Audio.Media.TITLE);
    int idColumn = musicCursor.getColumnIndex
            (android.provider.MediaStore.Audio.Media._ID);
    int artistColumn = musicCursor.getColumnIndex
            (android.provider.MediaStore.Audio.Media.ARTIST);
    //add songs to list
    do {
        long thisId = musicCursor.getLong(idColumn);
        String thisTitle = musicCursor.getString(titleColumn);
        String thisArtist = musicCursor.getString(artistColumn);
        songList.add(new Song(thisId, thisTitle, thisArtist));
    }
    while (musicCursor.moveToNext());
}
}
}

MediaPlayer.java (有些按钮还没有实现)

import android.app.Fragment;
import android.graphics.drawable.Drawable;
import android.media.MediaPlayer;
import android.os.Bundle; 
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.TextView;

 import java.util.concurrent.TimeUnit;


 public class Mediaplayer  extends Fragment{

 Drawable shuffle1,back1,play1,next1,repeat1;

 ImageButton shuffle,back,play,next,repeat;
 TextView start,end,artist,song;
 SeekBar songprogress;
 private MediaPlayer mediaPlayer;
 private double startTime = 0;
 private double finalTime = 0;
 private Handler myHandler = new Handler();;



    @Override
   public View onCreateView(LayoutInflater inflater,
                     ViewGroup container, Bundle savedInstanceState) {

//Inflate the layout for this fragment
View view=inflater.inflate(
        R.layout.content_main, container, false);
start=(TextView)view.findViewById(R.id.songCurrentDurationLabel);
end=(TextView)view.findViewById(R.id.songTotalDurationLabel);
song=(TextView)view.findViewById(R.id.song_title);
artist=(TextView)view.findViewById(R.id.songArtist);


shuffle=(ImageButton)view.findViewById(R.id.shuffle);
back=(ImageButton)view.findViewById(R.id.back);
play=(ImageButton)view.findViewById(R.id.play);
next=(ImageButton)view.findViewById(R.id.next);
repeat=(ImageButton)view.findViewById(R.id.repeat);
songprogress = (SeekBar) view.findViewById(R.id.songProgressBar);

  mediaPlayer = MediaPlayer.create(getActivity(),R.raw.song);
  mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener()      {
  @Override
   public void onCompletion(MediaPlayer mp) {
   play1 =
        getResources().getDrawable(R.drawable.play);
  play.setImageDrawable(play1);

  songprogress.setProgress(0);

  }
  });
   play.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        songprogress.setClickable(true);

        if(!mediaPlayer.isPlaying()) {

            mediaPlayer.start();
            finalTime = mediaPlayer.getDuration();
            startTime = mediaPlayer.getCurrentPosition();

            play1 =
                    getResources().getDrawable(R.drawable.pause);
            play.setImageDrawable(play1);


            songprogress.setMax((int) finalTime);

            end.setText(String.format("%d.%d",
                            TimeUnit.MILLISECONDS.toMinutes((long) finalTime),
                            TimeUnit.MILLISECONDS.toSeconds((long) finalTime) -
                                    TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) finalTime)))
            );

            start.setText(String.format("%d.%d",
                            TimeUnit.MILLISECONDS.toMinutes((long) startTime),
                            TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
                                    TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) startTime)))
            );

            songprogress.setProgress((int) startTime);
            myHandler.postDelayed(UpdateSongTime, 100);



        }else{
            mediaPlayer.pause();
            play1 =
                    getResources().getDrawable(R.drawable.play);
            play.setImageDrawable(play1);
        }
    }
   });
   songprogress.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        if(mediaPlayer != null && fromUser){
            mediaPlayer.seekTo(progress);
        }
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }
});

return view;
}
private Runnable UpdateSongTime = new Runnable() {
public void run() {
    startTime = mediaPlayer.getCurrentPosition();
    start.setText(String.format("%d.%d",

                    TimeUnit.MILLISECONDS.toMinutes((long) startTime),
                    TimeUnit.MILLISECONDS.toSeconds((long) startTime) -
                            TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.
                                    toMinutes((long) startTime)))
    );
    songprogress.setProgress((int)startTime);
    myHandler.postDelayed(this, 100);
}
};
}

SongAdapter.java

 import android.view.View; 
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import java.util.ArrayList;
 import android.content.Context;
 import android.view.LayoutInflater;
 import android.widget.LinearLayout;
 import android.widget.TextView;


public class SongAdapter extends BaseAdapter {
 private ArrayList<Song> songs;
private LayoutInflater songInf;
public SongAdapter(Context c, ArrayList<Song> theSongs){
    songs=theSongs;
    songInf=LayoutInflater.from(c);
}
@Override
public int getCount() {
    return songs.size();
}

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

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    //map to song layout
    LinearLayout songLay = (LinearLayout)songInf.inflate
            (R.layout.songlistitem, parent, false);
    //get title and artist views
    TextView songView = (TextView)songLay.findViewById(R.id.song_title);
    TextView artistView = (TextView)songLay.findViewById(R.id.song_artist);
    //get song using position
    Song currSong = songs.get(position);
    //get title and artist strings
    songView.setText(currSong.getTitle());
    artistView.setText(currSong.getArtist());
    //set position as tag
    songLay.setTag(position);
    return songLay;
}
}

Answer 1

要获取所选歌曲的详细信息，可以通过onItemClick()方法中的适配器，如下所示：

@Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(MainActivity.this,
                "" + mAdapter.getItem(position), Toast.LENGTH_SHORT).show();
    }

将事件监听器添加到ListView：

mWordListLV.setOnItemClickListener(this);

Answer 2

你可以简单地使用安卓的Songig MusicPlayer库。Songig处理你所有的音乐播放列表，让你通过许多回调来管理你的列表。您可以将许多ui绑定到songig，以便在需要时更改它们。例如，你可以将2个搜索栏绑定到songig，songig会在每次更新时改变它们的进度。