从加载程序检索到Recyclerview的列表会多次显示同一项目

Question

我正在使用以下代码从文件夹中提取所有视频，并将其显示在recyclerview中。我面临的问题是，在少数设备中，有时同一项目在RecyclerView中多次显示。我看到onLoadFinished被多次调用，但是每次清除列表时也不应显示重复项。按照其他答案，我尝试将initLoader（）调用移到onResume（）内，但这也没有解决我的问题。

活动

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
    rvVideos = (RecyclerView) findViewById(R.id.rvVideos);
    videoList=new ArrayList<VideoInfo>();
    rvVideos.setHasFixedSize(true);
    rvVideos.setLayoutManager(new LinearLayoutManager(this));
    videoAdapter = new VideoAdapter (this, videoList, filePath);
    rvVideos.setAdapter(videoAdapter);
    getLoaderManager().initLoader(URL_LOADER_SPLIT, null, VidActivity.this);

}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
    String selection = MediaStore.Video.Media.DATA + " like?";
    String[] selectionArgs = new String[]{"%" + filePath + "%"};
    return new CursorLoader(this, MediaStore.Video.Media.EXTERNAL_CONTENT_URI, COLUMNS_OF_INTEREST, selection, selectionArgs,
            MediaStore.Video.Media.DATE_ADDED + " ASC");
}

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
    if(cursor != null) {
        videoList.clear();
        while (cursor.moveToNext()) {
            VideoInfo videoInfo = new VideoInfo();
            videoInfo.setTitleValue(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME)));
            videoInfo.setSizeValue(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.SIZE)));
            videoInfo.setDurationValue(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DURATION)));
            videoInfo.setWidthValue(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.WIDTH)));
            videoInfo.setHeightValue(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.HEIGHT)));
            videoInfo.setVideoid(cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID)));
            videoList.add(videoInfo);
            videoAdapter.notifyDataSetChanged();

        }
    }

}

适配器

public class VideoAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

ArrayList<VideoInfo> videoList;
Context mContext;
String filePath;
Bitmap bmp;
private static final int TYPE_HEADER = 0;
private static final int TYPE_ITEM = 1;

public VideoAdapter(Context context, ArrayList<VideoInfo> videoList, String filePath) {
    mContext = context;
    this.videoList = videoList;
    this.filePath = filePath;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if (viewType == TYPE_HEADER) {
        View headerView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.item_header, parent, false);
        return new HeaderViewHolder(headerView);

    } else if (viewType == TYPE_ITEM) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.tab_child, parent, false);

        return new ItemViewHolder(itemView);
    }
    return null;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
    if (viewHolder instanceof HeaderViewHolder) {
        ((HeaderViewHolder) viewHolder).tvInstruction.setText(mContext.getResources().getString(R.string.folderCreatedPath, filePath));
    } else if (viewHolder instanceof ItemViewHolder) {
        VideoInfo videoInfo = videoList.get(position-1);
        String videoFullPath = filePath + "/" + videoInfo.getTitleValue();
        String size = Converters.BytesToMb(String.valueOf(videoInfo.getSizeValue()));
        String resolution = videoInfo.getWidthValue() + "X" + videoInfo.getHeightValue();
        ((ItemViewHolder) viewHolder).title.setText(videoInfo.getTitleValue());
        ((ItemViewHolder) viewHolder).size.setText(videoInfo.getSizeValue() > 0 ? size : "");
        ((ItemViewHolder) viewHolder).duration.setText(videoInfo.getDurationValue() > 0 ? String.format("%d:%d:%d", TimeUnit.MILLISECONDS.toHours((long) videoInfo.getDurationValue()), TimeUnit.MILLISECONDS.toMinutes((long) videoInfo.getDurationValue()) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours((long) videoInfo.getDurationValue())),
                TimeUnit.MILLISECONDS.toSeconds((long) videoInfo.getDurationValue()) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) videoInfo.getDurationValue()))) : "");
        ((ItemViewHolder) viewHolder).resolution.setText(videoInfo.getWidthValue() > 0 ? resolution : "");
        ((ItemViewHolder) viewHolder).mainLayout.setTag(position-1);
        ((ItemViewHolder) viewHolder).mainLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String videoFullPath = filePath + "/" + videoList.get(Integer.valueOf(view.getTag().toString())).getTitleValue();
                Intent intent = new Intent(mContext, PreviewActivity.class);
                intent.putExtra("filepath", videoFullPath);
                mContext.startActivity(intent);
            }
        });
    }
}

@Override
public int getItemCount() {
    return videoList.size() + 1;
}

public class ItemViewHolder extends RecyclerView.ViewHolder {
    CustomImageView thumbnail;
    TextView title;
    TextView resolution;
    TextView size;
    TextView duration;
    RelativeLayout mainLayout;

    public ItemViewHolder(View itemView) {
        super(itemView);
        title = (TextView) itemView.findViewById(R.id.VideoTitleNew);
        resolution = (TextView) itemView.findViewById(R.id.VideoResolutionNew);
        size = (TextView) itemView.findViewById(R.id.VideoSizeNew);
        thumbnail = (CustomImageView) itemView.findViewById(R.id.VideoThumbnailNew);
        duration = (TextView) itemView.findViewById(R.id.VideoDurationNew);
        mainLayout = (RelativeLayout) itemView.findViewById(R.id.VideoMainLayout);
    }
}

public class HeaderViewHolder extends RecyclerView.ViewHolder {

    TextView tvInstruction;

    public HeaderViewHolder(View itemView) {
        super(itemView);
        tvInstruction = (TextView) itemView.findViewById(R.id.tvInstruction);
    }
}

@Override
public int getItemViewType(int position) {
    if (isPositionHeader(position))
        return TYPE_HEADER;
    return TYPE_ITEM;
}

private boolean isPositionHeader(int position) {
    return position == 0;
}

}