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我一直在到处寻找解决方案，但它已经走到了尽头。请帮忙！

我录制并保存视频如下： 

File DirectoryFile = new File(VideoPath);
recorder.setOutputFile(DirectoryFile.getAbsolutePath());

我加载所有视频并从 userPath 设置 ListView 适配器，如下所示：

private File[] getNewImageFilesWithFilters() {
    File directory = new File(UserSavedDirectoryPATH);
    return directory.listFiles(new FilenameFilter() {
        public boolean accept(File dir, String name) {
            return name.toLowerCase(Locale.getDefault()).endsWith(".mp4") 
                || name.toLowerCase(Locale.getDefault()).endsWith(".mkv");
        }
    });
}   

public void LoadListView() {
    for (File file : listFile){
        mVideoListViewObject = new VideoListViewObject();
        mVideoListViewObject.setName(file.getName());
        mVideoListViewObject.setVideoUrl(file.getAbsolutePath());
        VideoListViewObject_List.add(mVideoListViewObject); 
    }        
    mVideoListViewAdapter = new VideoListAdapter(this, VideoListViewObject_List);
    mListView.setAdapter(mVideoListViewAdapter); 
}

ListView 适配器：

public class VideoListAdapter extends BaseAdapter {
    private List<VideoListViewObject> VideoObjectList;
    private Context mContext;

    public VideoListAdapter(Context context, List<VideoListViewObject> newList){
        this.mContext = context;
        this.VideoObjectList = newList;
    }

    @Override
    public int getCount() {
        return VideoObjectList.size();
    }

    @Override
    public VideoListViewObject getItem(int position) {
        return VideoObjectList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {       
      ViewHolder viewHolder = new ViewHolder();

      LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      if (convertView == null) {
          convertView = inflater.inflate(R.layout.listview_layout, parent, false);
          viewHolder.imageView = (ImageView)convertView.findViewById(R.id.ListViewImage); 
          viewHolder.layout = (RelativeLayout)convertView.findViewById(R.id.ListViewLayout);
          convertView.setTag(viewHolder);            
      } 
     else 
      {
         viewHolder = (ViewHolder)convertView.getTag();
      }

      Bitmap bmThumbnail = ThumbnailUtils.createVideoThumbnail(VideoObjectList.get(position).getVideoUrl(),Thumbnails.MICRO_KIND);    
      viewHolder.imageView.setImageBitmap(bmThumbnail);

问题是列表加载速度很慢，尤其是当有很多视频时。这会导致我的 VideoaAtivity 启动非常缓慢。

我喜欢 Piscasso 和 Universal Image Loader，但它们只支持图像。

有谁知道更好的解决方案或有助于提高性能的库？

非常感谢。

4

1 回答 1

1

我刚刚修改了我自己的应用程序以执行类似的逻辑来预先创建缩略图，这使得列表在开始时滚动得非常快，将缩略图位图添加到 videoListViewObject 并在加载视频列表时创建缩略图。这样，您不必每次在适配器中调用 getView 时都创建它。

public class VideoListViewObject{

  private Bitmap bitmap = null;

............................

    public void setBitmap(Bitmap bitmap)
    {
      this.bitmap = bitmap;
    }
    public Bitmap getBitmap()
    {
      return this.bitmap;
    }

}


public void LoadListView() {
    for (File file : listFile){
        mVideoListViewObject = new VideoListViewObject();
        mVideoListViewObject.setName(file.getName());
        mVideoListViewObject.setVideoUrl(file.getAbsolutePath());
        Bitmap bmThumbnail = ThumbnailUtils.createVideoThumbnail(VideoObjectList.get(position).getVideoUrl(),Thumbnails.MICRO_KIND);    
        mVideoListViewObject.setBitmap(bmThumbnail);
        VideoListViewObject_List.add(mVideoListViewObject); 
    }        
    mVideoListViewAdapter = new VideoListAdapter(this, VideoListViewObject_List);
    mListView.setAdapter(mVideoListViewAdapter); 
}

然后将您的 BaseAdapter 代码更改为仅在缩略图为空时创建缩略图，

public class VideoListAdapter extends BaseAdapter {
    private List<VideoListViewObject> VideoObjectList;
    private Context mContext;

    public VideoListAdapter(Context context, List<VideoListViewObject> newList){
        this.mContext = context;
        this.VideoObjectList = newList;
    }

    @Override
    public int getCount() {
        return VideoObjectList.size();
    }

    @Override
    public VideoListViewObject getItem(int position) {
        return VideoObjectList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {       
      ViewHolder viewHolder = new ViewHolder();

      LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      if (convertView == null) {
          convertView = inflater.inflate(R.layout.listview_layout, parent, false);
          viewHolder.imageView = (ImageView)convertView.findViewById(R.id.ListViewImage); 
          viewHolder.layout = (RelativeLayout)convertView.findViewById(R.id.ListViewLayout);
          convertView.setTag(viewHolder);            
      } 
     else 
      {
         viewHolder = (ViewHolder)convertView.getTag();
      }

      VideoListViewObject  mVideoListViewObject = getItem(position);
      Bitmap  bmThumbnail = mVideoListViewObject.getBitmap();
      if(bmThumbnail==null)
      {
        bmThumbnail = ThumbnailUtils.createVideoThumbnail(VideoObjectList.get(position).getVideoUrl(),Thumbnails.MICRO_KIND);    
      }
      viewHolder.imageView.setImageBitmap(bmThumbnail);
于 2015-04-23T16:55:40.007 回答