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，但我还没找到。

感谢您的帮助。

Answer 1

Andreas回答是正确的方法，但该代码没有获得绝对文件路径。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;
}

现在我们有了绝对路径，我们不需要再次获得路径了。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();
}

请务必使用：

playSong(mAudioPath[arg2]);

而不是：

playSong(mMusicList[arg2]);

列表视图中的

OnItemClickListener。

要仅获取曲目的标题（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`

而不是：

`MediaStore.Audio.Media.DISPLAY_NAME`

Answer 2

那里的代码是超级越野车。

getView没有任何意义。那个gc（）在那做什么？！所有moveToPosition（）调用都是什么。

这是重写的代码

        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;
        }

Answer 3

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;
}

显示SD卡上的所有音乐

3 个答案: