fix warnings

[boyan01]

Signed-off-by: boyan yangbinyhbn@gmail.com

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@c19de51). Click here to learn what that means.
The diff coverage is 27.08%.

@@            Coverage Diff            @@
##             master     #106   +/-   ##
=========================================
  Coverage          ?   20.96%           
=========================================
  Files             ?       99           
  Lines             ?     5620           
  Branches          ?        0           
=========================================
  Hits              ?     1178           
  Misses            ?     4442           
  Partials          ?        0

Flag	Coverage Δ
#unittests	20.96% <27.08%> (?)

Impacted Files	Coverage Δ
lib/pages/comments/page_comment.dart	25.53% <ø> (ø)
...ages/video/page_music_video_player_fullscreen.dart	0% <0%> (ø)
lib/pages/search/page_search.dart	0% <0%> (ø)
lib/pages/player/player_progress.dart	0% <0%> (ø)
lib/pages/welcome/page_welcome.dart	0% <0%> (ø)
lib/pages/playlist/dialog_selector.dart	0% <0%> (ø)
...pages/playlist/page_playlist_detail_selection.dart	0% <0%> (ø)
lib/pages/page_playing_list.dart	0% <0%> (ø)
lib/component/player/player.dart	8.1% <0%> (ø)
lib/pages/player/page_playing.dart	0% <0%> (ø)
... and 21 more

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