Android 实现 文件操作获取所有视频，异步查询媒体数据库获取视频的时长，并将视频通过recyclerView展示出来，每个item展示获取的视频时长代码实现

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);
    }
}