显示SD卡中的所有音乐

Question

我正在使用此页面的代码形式：

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

代码可以工作，但不是很好。 当我尝试向下滚动时，ListView会重复列表中的歌曲。

我一直在寻找一些替代代码，但没有找到。

谢谢任何帮助。

- Bjorn

Answer 1

安德烈亚斯的答案是正确的，但该代码未获取绝对文件路径。这会导致mMediaPlayer.prepare();抛出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;
}

现在我们已经有了绝对路径，就不需要再获取路径了。因此：

 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();
}

请确保使用：

playSong(mAudioPath[arg2]);

而不是：

playSong(mMusicList[arg2]);

在listview的OnItemClickListener中。

要仅获取曲目的标题（比带有扩展名的完整文件名更优美），请使用以下方法：

`MediaStore.Audio.Media.TITLE`

代替：

`MediaStore.Audio.Media.DISPLAY_NAME`

- Vikram Gupta

---

你没有调用 getAudioList()。 - Leo

我已经进行了编辑。谢谢！ :) - Vikram Gupta

如何获取小于某个持续时间的文件列表？ - Mihir Trivedi

我尝试获取标题一，但它显示列标题不存在？任何帮助将不胜感激。 - Adi

为什么你要在声明String[] songs和String[] mAudioPath两次？我认为你不需要在getAudioList()方法中再次声明它们。 - Raj

Answer 2

我不完全确定导致您提到的问题的确切原因，但请尝试此代码。

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();
}

- Andreas

---

在这行代码 mMediaPlayer.prepare() 处，出现了 IOException: Prepare failed. status=0x1 的错误。 - Vikram Gupta

获取IOException准备失败状态=0x1!!! - user2207133

Answer 3

那里的代码非常有 bug。

getView 没有任何意义。那个 gc() 在这里做什么？所有的 moveToPosition() 调用又是怎么回事。

下面是重写后的代码：

        public View getView(int position, View convertView, ViewGroup parent) {
              TextView tv = null;
              String id = null;
              if (convertView == null) {
                    tv = new TextView(getApplicationContext());
              } else
                    tv = (TextView) convertView;

              music_column_index = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
              id = musiccursor.getString(music_column_index);
              music_column_index = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE);
              id += " Size(KB): " + musiccursor.getString(music_column_index);

              tv.setText(id);
              return tv;
        }

- Vikram Bodicherla

---

“the code there” 指的是 @nikos-leonov 的那个代码吗？ - Gabor

是的，那里的代码指的是@Nikos Leonov的代码。他已经更新了他的答案以与我的相等，所以现在没问题了:D - Vikram Bodicherla

Answer 4

试试这段代码

public View getView(int position, View convertView, ViewGroup parent) {
System.gc();
String id = null;
TextView tv;
if (convertView == null) {
tv = new TextView(mContext.getApplicationContext());
} else{
tv = (TextView) convertView;
}
musiccursor.moveToPosition(position);
music_column_index = musiccursor
.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
id = musiccursor.getString(music_column_index);
music_column_index = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE);
id += " Size(KB):" + musiccursor.getString(music_column_index);
tv.setText(id);
return tv;
}

- Nikos Leonov