如何从我的列表视图中 SD 卡上的特殊文件夹加载歌曲并播放? [英] How load songs from special folder on sd card in my listview and play it?

问题描述

我想从我在 sd 卡上制作的自定义文件夹中加载歌曲并通过我的应用程序播放.

I want to load songs from my custom folder which I made on sd card and play it in via my App.

此文件夹的路径在:/sdcard/Music/MyFolder

the path of this folder is on: /sdcard/Music/MyFolder

现在我有一个代码可以加载位于 sc 卡上的所有音乐.此代码正在工作.但我不想要 sd 卡中的所有音乐，我只想要我文件夹 MyFolder 中的歌曲

Now I have a code which loads all music which is located on the sc card. This code is working. But I dont want all music from sd card, I just want the songs in my folder MyFolder

这是我现在拥有的代码:

Here's the code I have now:

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];
        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;
    }

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

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

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();
        }
        }
       });
    }

有人知道怎么做吗?

推荐答案

在选择中使用 where 条件，像这样.

use where condition in selection, like this.

final Cursor mCursor = getContentResolver()
    .query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, new String[] { MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.DATA }, MediaStore.Audio.Media.DATA
        + " LIKE '/storage/sdcard0/Music/MyFolder/%'", null, "LOWER("
        + MediaStore.Audio.Media.TITLE + ") ASC");

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