android获取本地视频缩略图和时长的两种方法

根据其他博客的一些说法，总结两种获取本地视频缩略图和时长的方法：

一.利用contentprovider去查询视频文件缩略图和时长，优点是速度快，缺点：有时候获取不到所有视频的缩略图。

 public List getVideoList(Context context) {
        List sysVideoList = new ArrayList<>();

        String[] thumbColumns = {MediaStore.Video.Thumbnails.DATA,
                MediaStore.Video.Thumbnails.VIDEO_ID};

        String[] mediaColumns = {MediaStore.Video.Media._ID,
                MediaStore.Video.Media.DATA, MediaStore.Video.Media.DURATION};

        Cursor cursor = context.getContentResolver().query(MediaStore.Video.Media
                        .EXTERNAL_CONTENT_URI,
                mediaColumns, null, null, null);

        if (cursor == null) {
            return sysVideoList;
        }
        if (cursor.moveToFirst()) {
            do {
                VideoBean info = new VideoBean();
                int id = cursor.getInt(cursor
                        .getColumnIndex(MediaStore.Video.Media._ID));
                Cursor thumbCursor = context.getContentResolver().query(
                        MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI,
                        thumbColumns, MediaStore.Video.Thumbnails.VIDEO_ID
                                + "=" + id, null, null);
                if (thumbCursor.moveToFirst()) {
                    info.setThumbPath(thumbCursor.getString(thumbCursor
                            .getColumnIndex(MediaStore.Video.Thumbnails.DATA)));
                }
                info.setPath(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media
                        .DATA)));
                info.setDuration(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video
                        .Media.DURATION)));
                sysVideoList.add(info);
            } while (cursor.moveToNext());

            if(cursor!=null){
                cursor.close();
            }
        }
        return sysVideoList;
    }

二.利用MediaMetadataRetriever，根据文件路径获取缩略图和时长。优点：只要有路径，就可以获取到。缺点：获取效率不高，耗时长，需要自己做缓存，不然每次加载去获取，用户体验不好。

 //根据路径得到视频缩略图
    private Bitmap getVideoPhoto(String videoPath) {

        media.setDataSource(videoPath);
        Bitmap bitmap = media.getFrameAtTime();
        return bitmap;
    }

    //获取视频总时长
    private int getVideoDuration(String path){
        media.setDataSource(path);
        String duration = media.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION); //
        return Integer.parseInt(duration);
    }

VideoBean.java如下：

public class VideoBean {
    String thumbPath;
    String path;
    int duration;
    Bitmap bitmap;

    public Bitmap getBitmap() {
        return bitmap;
    }

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

    public String getThumbPath() {
        return thumbPath;
    }

    public void setThumbPath(String thumbPath) {
        this.thumbPath = thumbPath;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    public int getDuration() {
        return duration;
    }

    public void setDuration(int duration) {
        this.duration = duration;
    }
}