Question

我正在尝试将设备上的所有音乐文件列为ListView。我在这里发现了类似问题的代码。它工作正常，但是当用户点击该项目时，我无法获得音乐文件的确切路径。从OnItemClickListener()方法，我能够获取文件的名称，但如何读取文件的绝对路径为String？任何帮助将不胜感激。

    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onItemClick中使用MediaStore.Audio.Media.DATA，它始终返回文件的PATH（或数据流）。

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

只需使用Log语句即可确保路径正确而不是文件名。

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

从ListView获取路径以播放音频

1 个答案: