do this :
video_one.setImageBitmap(bm);
video_two.setImageBitmap(bm1);
video_three.setImageBitmap(bm2);
video_four.setImageBitmap(bm3);
video_five.setImageBitmap(bm4);
video_six.setImageBitmap(bm);
video_seven.setImageBitmap(bm1);
video_eight.setImageBitmap(bm2);
video_nine.setImageBitmap(bm3);
video_ten.setImageBitmap(bm4);
video_ele.setImageBitmap(bm);
video_twe.setImageBitmap(bm1);
video_thir.setImageBitmap(bm2);
video_fort.setImageBitmap(bm3);
video_fif.setImageBitmap(bm4);
in onPostExecute becuase you can not modify ui from doinbackground
and do this in doInbackground
Bitmap bm = ThumbnailUtils.createVideoThumbnail(path,
MediaStore.Images.Thumbnails.MICRO_KIND);
Bitmap bm1 = ThumbnailUtils.createVideoThumbnail(path1,
MediaStore.Images.Thumbnails.MICRO_KIND);
Bitmap bm2 = ThumbnailUtils.createVideoThumbnail(path2,
MediaStore.Images.Thumbnails.MICRO_KIND);
Bitmap bm3 = ThumbnailUtils.createVideoThumbnail(path3,
MediaStore.Images.Thumbnails.MICRO_KIND);
Bitmap bm4 = ThumbnailUtils.createVideoThumbnail(path4,
MediaStore.Images.Thumbnails.MICRO_KIND);