显示SD卡上的所有音乐

Question

我正在使用此页面的代码:

http://z4android.blogspot.com/2011/06/displaying-list-of-music-files-stored.html

代码正在运行,但并不太好.当我尝试向下滚动时,ListView会不断重复列表中的歌曲.

我一直在寻找一些替代代码,但我没有找到任何代码.

谢谢你的帮助.

Answer 1

Andreas的答案是正确的方法,但该代码没有得到绝对的文件路径.这导致mMediaPlayer.prepare();投掷IOException: Prepare failed. status=0x1.

以下是获取文件路径和文件名的代码:

private String[] mAudioPath;
private MediaPlayer mMediaPlayer;
private String[] mMusicList;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mMediaPlayer = new MediaPlayer();

    ListView mListView = (ListView) findViewById(R.id.listView1);

    mMusicList = getAudioList();

    ArrayAdapter<String> mAdapter = new ArrayAdapter<String>(this,
    android.R.layout.simple_list_item_1, mMusicList);
    mListView.setAdapter(mAdapter);

    mListView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
    long arg3) {
    try {
        playSong(mAudioPath[arg2]);
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    }
   });
}

private String[] getAudioList() {
    final Cursor mCursor = getContentResolver().query(
            MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
            new String[] { MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.DATA }, null, null,
            "LOWER(" + MediaStore.Audio.Media.TITLE + ") ASC");

    int count = mCursor.getCount();

    String[] songs = new String[count];
    String[] mAudioPath = new String[count];
    int i = 0;
    if (mCursor.moveToFirst()) {
        do {
            songs[i] = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));
            mAudioPath[i] = mCursor.getString(mCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
            i++;
        } while (mCursor.moveToNext());
    }   

    mCursor.close();

    return songs;
}

现在我们有了绝对路径,我们不需要再次获得路径.所以:

 private void playSong(String path) throws IllegalArgumentException,
    IllegalStateException, IOException {

    Log.d("ringtone", "playSong :: " + path);

    mMediaPlayer.reset();
    mMediaPlayer.setDataSource(path);       
//mMediaPlayer.setLooping(true);
    mMediaPlayer.prepare();
    mMediaPlayer.start();
}

一定要使用:

playSong(mAudioPath[arg2]);

代替:

playSong(mMusicList[arg2]);

在listview OnItemClickListener中.

要仅获取轨道的标题(看起来比带有扩展名的整个文件名更优雅),请使用:

`MediaStore.Audio.Media.TITLE`

代替:

`MediaStore.Audio.Media.DISPLAY_NAME`

Answer 2

我不完全确定是什么原因导致你提到的问题,但试试这个代码.

private MediaPlayer mMediaPlayer;
private String[] mMusicList;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  mMediaPlayer = new MediaPlayer();

  ListView mListView = (ListView) findViewById(R.id.listView1);

  mMusicList = getMusic();

  ArrayAdapter<String> mAdapter = new ArrayAdapter<String>(this,
  android.R.layout.simple_list_item_1, mMusicList);
  mListView.setAdapter(mAdapter);

  mListView.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
    long arg3) {
      try {
        playSong(mMusicList[arg2]);
      } catch (IllegalArgumentException e) {
        e.printStackTrace();
      } catch (IllegalStateException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  });
}

private String[] getMusic() {
  final Cursor mCursor = managedQuery(
  MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
  new String[] { MediaStore.Audio.Media.DISPLAY_NAME }, null, null,
  "LOWER(" + MediaStore.Audio.Media.TITLE + ") ASC");

  int count = mCursor.getCount();

  String[] songs = new String[count];
  int i = 0;
  if (mCursor.moveToFirst()) {
    do {
      songs[i] = mCursor.getString(0);
      i++;
    } while (mCursor.moveToNext());
  }

  mCursor.close();

  return songs;
}

private void playSong(String path) throws IllegalArgumentException,
IllegalStateException, IOException {
  String extStorageDirectory = Environment.getExternalStorageDirectory()
  .toString();

  path = extStorageDirectory + File.separator + path;

  mMediaPlayer.reset();
  mMediaPlayer.setDataSource(path);
  mMediaPlayer.prepare();
  mMediaPlayer.start();
}