いつでもどこでも、お使いの端末で何百万もの最新の Android アプリ、ゲーム、音楽、映画、テレビ番組、書籍、雑誌などをお楽しみください。
Are you using a video player like Rock Player that supports external subtitles (.srt) but wont read your internal subtitles in mkv files?
Then you can use this application to extract your subtitle from the mkv file and save it as a plain srt file.
mVideoPlayer can do this but it only works on phones like Samsung Galaxy S.