private Bitmap GetThunbailFromVideo(string filename, ThumbnailKind ScreenKind)
{
Bitmap thumb = ThumbnailUtils.CreateVideoThumbnail(filename,
ScreenKind);
return(RotateBitmap(thumb, 90));
}
public static Dictionary <long, string> GetMediaThumbnailsPaths(ContentResolver contentResolver, ThumbnailKind kind)
{
string[] columns =
{
MediaStore.Images.Thumbnails.Data,
MediaStore.Images.Thumbnails.ImageId
};
var cursor = contentResolver.Query(MediaStore.Images.Thumbnails.ExternalContentUri, columns, $"{MediaStore.Images.Thumbnails.Kind} = {(int)kind}", null, null);
var dic = new Dictionary <long, string>();
var dublicate = new HashSet <long>();
if (cursor != null)
{
var count = cursor.Count;
var dataColumnIndex = cursor.GetColumnIndex(MediaStore.Images.Thumbnails.Data);
var idColumnIndex = cursor.GetColumnIndex(MediaStore.Images.Thumbnails.ImageId);
for (var i = 0; i < count; i++)
{
cursor.MoveToPosition(i);
var key = cursor.GetLong(idColumnIndex);
var value = cursor.GetString(dataColumnIndex);
if (dic.ContainsKey(key))
{
dublicate.Add(key);
var file = new File(dic[key]);
if (file.Exists())
{
file.Delete();
}
file = new File(value);
if (file.Exists())
{
file.Delete();
}
contentResolver.Delete(MediaStore.Images.Thumbnails.ExternalContentUri, MediaStore.Images.Thumbnails.ImageId + "=?", new[] { key.ToString() });
dic.Remove(key);
}
else if (dublicate.Contains(key))
{
var file = new File(value);
if (file.Exists())
{
file.Delete();
}
}
else
{
dic.Add(key, value);
}
}
cursor.Close();
}
return(dic);
}
/**
* * 获取视频的缩略图 先通过ThumbnailUtils来创建一个视频的缩略图，然后再利用ThumbnailUtils来生成指定大小的缩略图。
* * 如果想要的缩略图的宽和高都小于MICRO_KIND，则类型要使用MICRO_KIND作为kind的值，这样会节省内存。
* *
* * @param videoPath
* * 视频的路径
* * @param width
* * 指定输出视频缩略图的宽度
* * @param height
* * 指定输出视频缩略图的高度度
* * @param kind
* * 参照MediaStore.Images.Thumbnails类中的常量MINI_KIND和MICRO_KIND。
* * 其中，MINI_KIND: 512 x 384，MICRO_KIND: 96 x 96
* * @return 指定大小的视频缩略图
* */
public static Bitmap GetVideoThumbnail(String videoPath, int width, int height, ThumbnailKind kind)
{
Bitmap bitmap = null;
bitmap = ThumbnailUtils.CreateVideoThumbnail(videoPath, kind);
bitmap = ThumbnailUtils.ExtractThumbnail(bitmap, width, height, ThumnailExtractOptions.RecycleInput);
return(bitmap);
}
