Question

如何从Android中的应用程序访问音乐播放器中的曲目？我必须以某种方式导入所有曲目，并通过蓝牙连接在其他设备上播放。

Answer 1

好的，使用下面的代码从SD卡中获取列表视图中的所有音乐文件。

public class Recording_List extends Activity{

    ListView mListView;
    ImageView mPlayPause;

    private File file;
    private MediaPlayer mp = new MediaPlayer();
    private Handler mHandler = new Handler();
    private List<String> myList = new ArrayList<String>();

    private static final String MEDIA_PATH = new String(
            Environment.getExternalStorageDirectory() + "/AudioRecorder/");

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.recordlist);

        mListView = (ListView) findViewById(R.id.recordList);
        mPlayPause = (ImageView) findViewById(R.id.play_pause);

        file = new File(MEDIA_PATH);
        if (!file.exists()) {
            file.mkdir();
        }
        File list[] = file.listFiles();
        for (int i = 0; i < list.length; i++) {
            myList.add(list[i].getName());
        }
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, myList);
        adapter.notifyDataSetChanged();
        mListView.setAdapter(adapter);
        mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        mListView.setCacheColorHint(Color.TRANSPARENT);

        mListView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                playSong(MEDIA_PATH + myList.get(position));
            }
        });

        mPlayPause.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                if (mp.isPlaying()) {
                    if (mp != null) {
                        mp.pause();
                        mPlayPause.setImageResource(R.drawable.play);
                    }
                } else {
                    if (mp != null) {
                        mp.start();
                        mPlayPause.setImageResource(R.drawable.pause);
                    }
                }
            }
        });
    }

    private void playSong(String songPath) {
        try {
            mp.reset();
            mp.setDataSource(songPath);
            mp.prepare();
            mp.start();
        } catch (IOException e) {
            Log.v(getString(R.string.app_name), e.getMessage());
        }
    }
}

所以基本上上面的代码会列出列表视图中的所有文件，从SD卡文件夹名称录音机，您可以在那里指定您的路径并获取您的所有音频文件。当您点击列表视图项时，它将播放该歌曲。

从应用程序访问音乐播放器中的所有曲目

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