从ListView获取播放音频的路径

Question

我试图将设备上的所有音乐文件列为ListView。我从一个类似的问题中找到了这个代码。它工作得很好，但是当用户单击该项目时，我在获取音乐文件的确切路径时遇到了麻烦。从OnItemClickListener()方法，我能够获得文件的名称，但是我如何读取文件的绝对路径作为字符串?如有任何帮助，不胜感激。

    public class MusicActivity extends FragmentActivity {
    ListView musiclist;
    Cursor musiccursor;
    int music_column_index;
    int count;
    MediaPlayer mMediaPlayer;
    SharedPreferences musicList;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        init_phone_music_grid();
    }
    private void init_phone_music_grid() {
        System.gc();
        String[] proj = { MediaStore.Audio.Media._ID,
                MediaStore.Audio.Media.DATA,
                MediaStore.Audio.Media.DISPLAY_NAME,
                MediaStore.Video.Media.SIZE };
        musiccursor = managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                proj, null, null, null);
        count = musiccursor.getCount();
        musiclist = (ListView)findViewById(R.id.sample);
        musiclist.setAdapter(new MusicAdapter(getApplicationContext()));
        musiclist.setOnItemClickListener(musicgridlistener);
        mMediaPlayer = new MediaPlayer();
    }
    private OnItemClickListener musicgridlistener = new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View v, int position,
                                long id) {
            System.gc();
            music_column_index = musiccursor
                    .getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
            musiccursor.moveToPosition(position);
            String filename = musiccursor.getString(music_column_index);
            try {
                if (mMediaPlayer.isPlaying()) {
                    mMediaPlayer.reset();
                }
                mMediaPlayer.setDataSource(filename);
                mMediaPlayer.prepare();
                mMediaPlayer.start();
            } catch (Exception e) {
            }
        }
    };
    public class MusicAdapter extends BaseAdapter {
        private Context mContext;
        public MusicAdapter(Context c) {
            mContext = c;
        }
        public int getCount() {
            return count;
        }
        public Object getItem(int position) {
            return position;
        }
        public long getItemId(int position) {
            return position;
        }
        public View getView(int position, View convertView, ViewGroup parent) {
            System.gc();
            TextView tv = new TextView(mContext.getApplicationContext());
            String id = null;
            if (convertView == null) {
                music_column_index = musiccursor
                        .getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
                musiccursor.moveToPosition(position);
                id = musiccursor.getString(music_column_index);
                music_column_index = musiccursor
                        .getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE);
                musiccursor.moveToPosition(position);
                id += " Size(KB):" + musiccursor.getString(music_column_index);
                //tv.setText(id);
            } else
                tv = (TextView) convertView;
            return tv;
        }
    }
}

Answer 1

在您的onItemClick中，您使用的MediaStore.Audio.Media.DATA总是返回文件的PATH(或数据流)。

要获取文件名，您需要使用MediaStore.Audio.Media.DISPLAY_NAME。

只使用Log语句来确保你有正确的路径而不是文件名。

String filename = musiccursor.getString(music_column_index);
Log.d("TAG", filename);