解释这段代码String path = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.DATA)); MediaMetadataRetriever retriever = new MediaMetadataRetriever(); retriever.setDataSource(path); String duration = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);

好的，以下是获取当前手机播放音乐的流数据的Android代码： ```java // 首先需要获取当前正在播放的音乐的媒体ID MediaMetadataRetriever retriever = new MediaMetadataRetriever(); String mediaId = String.valueOf( ((AudioManager) getSystemService(Context.AUDIO_SERVICE)) .getParameters(AudioManager.GET_DEVICES_OUTPUTS) .getParcelableArray(0) .getId()); // 获取指定媒体ID的音乐流数据 Uri mediaUri = MediaStore.Audio.Media.getContentUriForPath(""); String selection = MediaStore.Audio.Media.MEDIA_ID + "=?"; String[] selectionArgs = {mediaId}; Cursor cursor = getContentResolver().query(mediaUri, null, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { int duration = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.DURATION)); int size = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.SIZE)); String filePath = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA)); FileInputStream fis = new FileInputStream(new File(filePath)); byte[] audioData = new byte[size]; fis.read(audioData); fis.close(); // 现在audioData就是获取到的音乐流数据了 } ``` 希望能够对您有所帮助！

以下是代码实现： ``` // 获取所有视频 String[] projection = {MediaStore.Video.Media._ID, MediaStore.Video.Media.DATA}; Cursor cursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, projection, null, null, null); // 异步查询媒体数据库获取视频的时长 new AsyncTask<Void, Void, Void>() { @Override protected Void doInBackground(Void... voids) { if (cursor != null) { while (cursor.moveToNext()) { int id = cursor.getInt(cursor.getColumnIndex(MediaStore.Video.Media._ID)); String path = cursor.getString(cursor.getColumnIndex(MediaStore.Video.Media.DATA)); MediaMetadataRetriever retriever = new MediaMetadataRetriever(); retriever.setDataSource(path); String duration = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION); // 将视频通过recyclerView展示出来 runOnUiThread(() -> { Video video = new Video(id, path, duration); videoList.add(video); adapter.notifyItemInserted(videoList.size() - 1); }); } cursor.close(); } return null; } }.execute(); ``` 其中，Video类的定义如下： ``` public class Video { private int id; private String path; private String duration; public Video(int id, String path, String duration) { this.id = id; this.path = path; this.duration = duration; } public int getId() { return id; } public String getPath() { return path; } public String getDuration() { return duration; } } ``` 在RecyclerView的Adapter中，可以通过ViewHolder展示获取的视频时长： ``` public class VideoAdapter extends RecyclerView.Adapter<VideoAdapter.ViewHolder> { private List<Video> videoList; static class ViewHolder extends RecyclerView.ViewHolder { ImageView videoImage; TextView videoDuration; public ViewHolder(View view) { super(view); videoImage = view.findViewById(R.id.video_image); videoDuration = view.findViewById(R.id.video_duration); } } public VideoAdapter(List<Video> videoList) { this.videoList = videoList; } @NonNull @Override public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.video_item, parent, false); ViewHolder holder = new ViewHolder(view); return holder; } @Override public void onBindViewHolder(@NonNull ViewHolder holder, int position) { Video video = videoList.get(position); holder.videoImage.setImageBitmap(getVideoThumbnail(video.getPath())); holder.videoDuration.setText(formatDuration(video.getDuration())); } @Override public int getItemCount() { return videoList.size(); } // 获取视频缩略图 private Bitmap getVideoThumbnail(String path) { MediaMetadataRetriever retriever = new MediaMetadataRetriever(); retriever.setDataSource(path); return retriever.getFrameAtTime(); } // 格式化视频时长 private String formatDuration(String duration) { long milliseconds = Long.parseLong(duration); long seconds = milliseconds / 1000; long minutes = seconds / 60; seconds = seconds % 60; return String.format("%02d:%02d", minutes, seconds); } } ```